Microsoft Study Bible

Does your training center need an online business expansion?

Jackson — Mon, 22 Feb 2010 03:41:08 +0000

Hello everyone, I am Megan from Getinmore. Remember my name for I am willing to help your training center to get more income.

What is Getinmore?

Getinmore is an online training service corporation which aims to enable you to start your training business online with 0 input.

What is our Service?

We have three major platforms: online trading platform, affiliate marketing platform, and remote education platform.

What does Online Trading Platform Contain?

Online Training Platform. In another word, it is our website. You are able to release and manage your online training courses information, check how many students are enrolled, how much do you earn, and how many customers are brought by the affiliate marketing, the evaluation from the students, apply to payment, etc. You may think you can also do this on your website. Indeed. This is just a first part of our service.

How does Affiliate Marketing Platform work?

Affiliate Marketing Platform brings your additional customers. You are able to check how many students are brought by it in your user center. And the students can also be your local students. After we have enough students, you submit the time to start the class. Then, you can use our Remote Educational Platform to deliver the course.

What is the Remote Educational Platform?

We use WebEx as your educational tool. If your trainers are not familiar with WebEx, we have technicians to train them. And before cooperation, you can have a test on the platform to see whether it work well with your class. And in every class, we will arrange a host to help your solve the problems with using WebEx.

After your trainers finish delivering the lecture, you can apply us to pay the fee to you. And we will transfer the money to your account in a month.

All the services enable to start your own online training center with 0 inputs. We will add customized services according to your advices.

Please tell me your advice about service for we sincerely welcome you to join us and sparing no efforts to improve our service to meet your requirements.

Please mail me @ sales@getinmore.com or call me @ +17033504321.

Advices and Cooperation intentions are mostly welcomed.

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Linq statement in Asp.net

Jackson — Thu, 17 Dec 2009 08:58:00 +0000

If it is in desktop, you just need to

_context.Log = Console.Out;

You just input SQL statement in the console .So, what about in Asp.net?

I want to try to use StringWriter. We can use it to replace Console.Out to help us receive the output log, and save the log in StringBuider.

So, construct an auxiliary class

using System;

　using System.Collections.Generic;

　using System.Linq;

　using System.Web;

　using System.IO;

　using System.Text;

　namespace Clowwindy.Models

　{

　public static class LogHelper

　{

　public static StringBuilder Log = new StringBuilder();

　public static TextWriter In = new StringWriter(Log);

　public static string GetAllLog()

　{

　In.Flush();

　return Log.ToString();

　}

　public static void Clean()

　{

　Log = new StringBuilder();

　In = new StringWriter(Log);

　}

　Add another page log.aspx to display the log：

　<%@ Page Language=”C#” AutoEventWireup=”true”

　CodeBehind=”Log.aspx.cs” Inherits=”Clowwindy.Log” %>

　“http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd“>

　http://www.w3.org/1999/xhtml” >

　SQL Log

　using System;

　using System.Collections.Generic;

　using System.Linq;

　using System.Web;

　using System.Web.UI;

　using System.Web.UI.WebControls;

　using Clowwindy.Models;

　namespace Clowwindy

　{

　public partial class Log : System.Web.UI.Page

　{

　protected void Page_Load(object sender, EventArgs e)

　{

　if (Request.UserHostAddress != “127.0.0.1″)

　{

　Response.End();

　return;

　}

　Literal1.Text = LogHelper.GetAllLog().Replace(”\n”,”\n
”);

　}

　protected void btn_Clean_Click(object sender, EventArgs e)

　{

　LogHelper.Clean();

　Literal1.Text = null;

　}

Finally, in the places where new DataContext is, Add _context.Log = LogHelper.In:

public Repository()

　{

　_context = new TDataContext();

　_context.Log = LogHelper.In;

　}

Open log.aspx, you will see the previous SQL statements.

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How to pass parameters between Asp.net pages

Jackson — Mon, 07 Dec 2009 09:28:35 +0000

There are many methods to pass parameters between pages, including Get, Post, Session, and Application。However，there are some new and unique methods in Asp.Net.
The page B wants to take the value from Page A.
Page A code:

public partial class Default : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)

　　{

　　}

　　public string F

　　{

　　get { return this.TextBox1.Text.ToString(); }

　　set { this.TextBox1.Text = value; }

　　}

　　public string M

　　{

　　get { return this.TextBox2.Text.ToString(); }

　　set { this.TextBox2.Text = value; }
　

}

　　protected void Button1_Click(object sender, EventArgs e)

　　{

　　Server.Transfer(“Default2.aspx”);

　　// Note :the address bar has not been changed

　　//Response.Redirect can not work……

　　//Response.Redirect(”Default2.aspx”);

　　　　}

Page B code

public partial class Default2 : System.Web.UI.Page
　　{

protected void Page_Load(object sender, EventArgs e)

　　{

　　Default s;

　　if (Context.Handler is Default)

　　{

　　s = (Default)Context.Handler;

　　Label1.Text = s.F + “—”+ s.M;

　　}

Note: The page Default.aspx.cs itself is a class .So, you can directly use this class in the second page, and encapsulate the parameters to pass for outside visit.

One page can receive parameters from multiple pages and deal with the results centrally.

1. New parameter class and interface

/**////

///QueryParams of the summary

　　///

　　public class QueryParams

　　{

　　private string staDate;

　　private string endDate;

　　/**////

　　/// the start-time

　　///

　　public string StaDate

　　{

　　get { return this.staDate; }

　　set { this.staDate = value; }

　　}

　　/**////

　　/// the end time

　　///

　　public string EndDate

　　{

　　get { return this.endDate; }

　　set { this.endDate = value; }

　　}

　　/**////

　　/// Define Query Interface。

　　///

　　public interface IQueryParams

　　{

　　/**////

　　/// parameters

　　///

　　QueryParams Parameters{get;}

　　}

2. To inherit this interface in multiple pages.

public partial class Default3 : System.Web.UI.Page,IQueryParams

　　{

　　private QueryParams param;

　　public QueryParams Parameters

　　{

　　get

　　{

　　return param;

　　}

　　protected void Page_Load(object sender, EventArgs e)

　　{

　　}

　　protected void Button1_Click(object sender, EventArgs e)

　　{

　　param = new QueryParams();

　　param.StaDate = this.TextBox1.Text.ToString();

　　param.EndDate = this.TextBox2.Text.ToString();

　　Server.Transfer(“Default4.aspx”);

　　}

3. Do the same operation in other pages.

public partial class Default4 : System.Web.UI.Page

　　{

　　protected void Page_Load(object sender, EventArgs e)

　　{

　　QueryParams queryParams = new QueryParams();

　　IQueryParams queryInterface;

　　if (Context.Handler is IQueryParams)

　　{

　　queryInterface = (IQueryParams)Context.Handler;

　　queryParams = queryInterface.Parameters;

　　}

　　Label1.Text = “StaDate：“ + queryParams.StaDate + “　　EndDate：” + queryParams.EndDate;

　　}

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How to achieve image zoom in WPF ？

Jackson — Wed, 02 Dec 2009 09:03:37 +0000

Here is a question! I need to perform a zoom on an image, how can I do this? Here, we’ll introduce a way to achieve image zoom by using the mouse in WPF.

Here is the key code.

XAML code:

<Grid.Resources><TransformGroup x:Key=”ImageCompareResources”><ScaleTransform /><TranslateTransform/>TransformGroup>Grid.Resources> <ScrollViewer HorizontalScrollBarVisibility=”Disabled”=”Disabled” Grid.Row=”0″ Grid.Column=”0″ x:Name=”MasterScrollViewer” Margin=”5″ Background=”WhiteSmoke”><ContentControl x:Name=”TestContentControl1″=”MasterImage_MouseLeftButtonDown”=”MasterImage_MouseLeftButtonUp”=”MasterImage_MouseMove”=”MasterImage_MouseWheel”><Image RenderOptions.BitmapScalingMode=”NearestNeighbor” =”MasterImage” Source=”{Binding Path=MasterImagePath}” Stretch=”Uniform”=”{StaticResource ImageCompareResources}”/>ContentControl>ScrollViewer>

VerticalScrollBarVisibility

MouseLeftButtonDown

MouseLeftButtonUp

MouseMove

MouseWheel

x:Name

RenderTransform

C# code:

private void MasterImage_MouseWheel(object sender, MouseWheelEventArgs e)as ContentControl;if (image == null)return;“ImageCompareResources”) as TransformGroup;null, “Can’t find transform group from image compare panel resource”);double scale = e.Delta * 0.001;private static void ZoomImage(TransformGroup group, Point point, double scale)null, “Oops, ImageCompareResources is removed from current control’s resouce”);0] as ScaleTransform;if (transform.ScaleX + scale < 1)return;1] as TranslateTransform;1 * ((pointToContent.X * transform.ScaleX) - point.X);1 * ((pointToContent.Y * transform.ScaleY) - point.Y);private void MasterImage_MouseMove(object sender, MouseEventArgs e)as ContentControl;if (image == null)return;if (this.isMouseLeftButtonDown && e.LeftButton == MouseButtonState.Pressed)this.DoImageMove(image, e.GetPosition(image));private void DoImageMove(ContentControl image, Point position)“ImageCompareResources”) as TransformGroup;null, “Can’t find transform group from image compare panel resource”);1] as TranslateTransform;this.previousMousePoint.X;this.previousMousePoint.Y;this.previousMousePoint = position;

{

ContentControl image = sender

{

}

TransformGroup group = ImageComparePanel.FindResource(

Debug.Assert(group !=

Point point = e.GetPosition(image);

ZoomImage(group, point, scale);

}

{

Debug.Assert(group !=

Point pointToContent = group.Inverse.Transform(point);

ScaleTransform transform = group.Children[

{

}

transform.ScaleX += scale;

transform.ScaleY += scale;

TranslateTransform transform1 = group.Children[

transform1.X = -

transform1.Y = -

}

{

ContentControl image = sender

{

}

{

}

{

TransformGroup group = ImageComparePanel.FindResource(

Debug.Assert(group !=

TranslateTransform transform = group.Children[

transform.X += position.X -

transform.Y += position.Y -

}

It is convenient for us to achieve image zoom by using WPF. As WPF has a lot of functions which are able to process images including Class Transform which is used to move, zoom, rotate pictures, and Class Effect which is used to modify the appearance of image. These classes all can be set directly in XAML code. Therefore, Resource and XAML can be used in conjunction to compress the code and achieve more applications .The steps are as follows:

1. Define a TranslateTransform instance to modify the initial position the image shows.

2. Define a ScaleTransform instance to zoom the image. You can specify the origin the images zoom in by setting the value of CenterX and CenterY.

3. We should put the two classes Transform into a TransformGroup in order that Image Control can use the two Transform at the same time .You will find that the base class of the TransformGroup is Transform too.

4. Put TransformGroup into Resource in the current form in order that all of the image in this form can use this instance.

5. Modify the corresponding value of TranslateTransform in Mouse Move event.

6. Modify the value of ScaleX and ScaleY in ScaleTransform in onMouseWheel event to zoom the image.

Window1.xaml

<Window x:Class="MouseMove.Window1"="http://schemas.microsoft.com/winfx/2006/xaml/presentation"="http://schemas.microsoft.com/winfx/2006/xaml"="clr-namespace:MouseMove"="Window1" Height="600" Width="800"><Grid x:Name="MainPanel"><Grid.Resources><TransformGroup x:Key="ImageTransformResource"><ScaleTransform /><TranslateTransform />TransformGroup>Grid.Resources><Grid.ColumnDefinitions><ColumnDefinition /><ColumnDefinition />Grid.ColumnDefinitions><Rectangle Grid.Column="0" x:Name="MasterImage"="MasterImage_MouseLeftButtonDown"="MasterImage_MouseLeftButtonUp"="MasterImage_MouseMove"="MasterImage_MouseWheel"><Rectangle.Fill><VisualBrush Transform="{StaticResource ImageTransformResource}" Stretch="Uniform"><VisualBrush.Visual><Image Source="C:"Windows"Web"Wallpaper"Architecture"Img15.jpg" />VisualBrush.Visual>VisualBrush>Rectangle.Fill>Rectangle><Rectangle Grid.Column="1"="MasterImage_MouseLeftButtonDown"="MasterImage_MouseLeftButtonUp"="MasterImage_MouseMove"="MasterImage_MouseWheel"><Rectangle.Fill><VisualBrush Transform="{StaticResource ImageTransformResource}" Stretch="Uniform"><VisualBrush.Visual><Image Source="C:"Windows"Web"Wallpaper"Architecture"Img14.jpg" />VisualBrush.Visual>VisualBrush>Rectangle.Fill>Rectangle>Grid>Window>

xmlns

xmlns:x

xmlns:local

Title

MouseLeftButtonDown

MouseLeftButtonUp

MouseMove

MouseWheel

MouseLeftButtonDown

MouseLeftButtonUp

MouseMove

MouseWheel

Window1.xaml.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using System.Diagnostics;namespace MouseMove///

/// Interaction logic for Window1.xaml///

public partial class Window1 : Windowprivate bool m_IsMouseLeftButtonDown;public Window1()private void MasterImage_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)as Rectangle;if (rectangle == null)return;false;private Point m_PreviousMousePoint;private void MasterImage_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)as Rectangle;if (rectangle == null)return;true;private void MasterImage_MouseMove(object sender, MouseEventArgs e)as Rectangle;if (rectangle == null)return;if (m_IsMouseLeftButtonDown)private void DoImageMove(Rectangle rectangle, MouseEventArgs e)//Debug.Assert(e.LeftButton == MouseButtonState.Pressed);

if (e.LeftButton != MouseButtonState.Pressed)return;"ImageTransformResource") as TransformGroup;null);1] as TranslateTransform;private void MasterImage_MouseWheel(object sender, MouseWheelEventArgs e)“ImageTransformResource”) as TransformGroup;null);0] as ScaleTransform;0.001;0.001;

{

InitializeComponent();

}

{

Rectangle rectangle = sender

rectangle.ReleaseMouseCapture();

m_IsMouseLeftButtonDown =

}

{

Rectangle rectangle = sender

rectangle.CaptureMouse();

m_IsMouseLeftButtonDown =

m_PreviousMousePoint = e.GetPosition(rectangle);

}

{

Rectangle rectangle = sender

DoImageMove(rectangle, e);

}

{

TransformGroup group = MainPanel.FindResource(

Debug.Assert(group !=

TranslateTransform transform = group.Children[

Point position = e.GetPosition(rectangle);

transform.X += position.X - m_PreviousMousePoint.X;

transform.Y += position.Y - m_PreviousMousePoint.Y;

m_PreviousMousePoint = position;

}

{

TransformGroup group = MainPanel.FindResource(

Debug.Assert(group !=

ScaleTransform transform = group.Children[

transform.ScaleX += e.Delta *

transform.ScaleY += e.Delta *

}

We have achieved zoom drag based on the center of the image and want to achieve zoom drag based on the picture focus. The following instance will help us make it.

On the bottom right of the picture, there is a square which is a picture in WPF program .Its size is 40 x 40 .The black point inside is the initial point which is ready to zoom. Suppose that the coordinate of the black point is (10, 10).When the program is on, the users can firstly move the square into the left position. Of course, the black point also will move. Suppose that the picture moved 50 pixels.

Then, in the position moved, the user can zoom the image, for example, magnify two-fold, which will also move the black point into the final location of the picture. Because when we zoom the image, in fact we move each pixel on the original picture into new position (red point).At the same time, the new initial point (red point) of the coordinate is (20,20). The space between two adjacent pixels is filled by using the interpolation method. Now,

ScaleTransform.ScaleX=2;

ScaleTransform.ScaleY=2;

If the users want to enlarge other area of the image and double size –three times of the original picture. There is a blue point in the picture below. Suppose the coordinate is (50,50).Whether the image is zoomed in or out ,the users only judge the new zoom focus by the content in the actual image he saw.

If we set the prosperities of ScaleTransform blindly as the value similar to those below:

ScaleTransform.ScaleX = 3;

ScaleTransform.ScaleY = 3;

ScaleTransform.CenterX = 50;

ScaleTransform.CenterY = 50;

There will be a problem. Because ScaleX=3 ，which means to the new image is three times of the original one .However, our original point is on the image which is double of the previous one whose size is just 40 X 40 .The solution is to convert the position where the blue point is back to the place the original picture. Please remember that the original one should be the one on the bottom right of the picture below, not the one on the left which have been moved by user.

It seems that it is hard to convert the position .However WPF have a TransformGroup.Inverse function, which can convert the coordinate which is on the image converted back into the one on the original image .Of course, if you are familiar to Graphics and linear algebra, in fact, the zoom and movement of the image is equal to the original image multiplied by a matrix. And the function TransformGroup.Inverse is to perform the matrix inversion operation.

The key code is as follows:

XML code:

<Grid.Resources><TransformGroup x:Key="ImageCompareResources"><ScaleTransform /><TranslateTransform/>TransformGroup>Grid.Resources> <ScrollViewer HorizontalScrollBarVisibility="Disabled"="Disabled" Grid.Row="0" Grid.Column="0" x:Name="MasterScrollViewer" Margin="5" Background="WhiteSmoke"><ContentControl x:Name="TestContentControl1"="MasterImage_MouseLeftButtonDown"="MasterImage_MouseLeftButtonUp"="MasterImage_MouseMove"="MasterImage_MouseWheel"><Image RenderOptions.BitmapScalingMode="NearestNeighbor" ="MasterImage" Source="{Binding Path=MasterImagePath}" Stretch="Uniform"="{StaticResource ImageCompareResources}"/>ContentControl>ScrollViewer>

VerticalScrollBarVisibility

MouseLeftButtonDown

MouseLeftButtonUp

MouseMove

MouseWheel

x:Name

RenderTransform

C# code:

private void MasterImage_MouseWheel(object sender, MouseWheelEventArgs e)as ContentControl;if (image == null)return;"ImageCompareResources") as TransformGroup;null, "Can't find transform group from image compare panel resource");double scale = e.Delta * 0.001;private static void ZoomImage(TransformGroup group, Point point, double scale)null, "Oops, ImageCompareResources is removed from current control's resouce");0] as ScaleTransform;if (transform.ScaleX + scale < 1)return;1] as TranslateTransform;1 * ((pointToContent.X * transform.ScaleX) - point.X);1 * ((pointToContent.Y * transform.ScaleY) - point.Y);private void MasterImage_MouseMove(object sender, MouseEventArgs e)as ContentControl;if (image == null)return;if (this.isMouseLeftButtonDown && e.LeftButton == MouseButtonState.Pressed)this.DoImageMove(image, e.GetPosition(image));private void DoImageMove(ContentControl image, Point position)“ImageCompareResources”) as TransformGroup;null, “Can’t find transform group from image compare panel resource”);1] as TranslateTransform;this.previousMousePoint.X;this.previousMousePoint.Y;this.previousMousePoint = position;

{

ContentControl image = sender

{

}

TransformGroup group = ImageComparePanel.FindResource(

Debug.Assert(group !=

Point point = e.GetPosition(image);

ZoomImage(group, point, scale);

}

{

Debug.Assert(group !=

Point pointToContent = group.Inverse.Transform(point);

ScaleTransform transform = group.Children[

{

}

transform.ScaleX += scale;

transform.ScaleY += scale;

TranslateTransform transform1 = group.Children[

transform1.X = -

transform1.Y = -

}

{

ContentControl image = sender

{

}

{

}

{

TransformGroup group = ImageComparePanel.FindResource(

Debug.Assert(group !=

TranslateTransform transform = group.Children[

transform.X += position.X -

transform.Y += position.Y -

}

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Error LNK2001 (C++)

Jackson — Wed, 02 Dec 2009 08:58:18 +0000

Would you have such an experience: you try to build program in C++ code. All of the code is simple and legal, however, when you compile link with your programs, the following link errors happen:

>error LNK2001: unresolved external symbol _purecall

To resolve this problem or know better how we make this mistake, firstly we will reproduce this error together. Create a new win32 project, and open the project settings in VS, and modify the projects bellow:

1. set “ enable C++ exception “ as” false”

2. set “Basic Runtime Checks” as “default”

3. set “Buffer security check” as “false (/GS-)”

4. set “Enable Run-Time Type Information” as “false (/GR-)”

5. set “Ignore all default libraries ” as “yes (/NODEFAULTLIB)”

Then, you will input the following code in the source file:

C++ code:

1. #include

2. #include

4. void* operator new(size_t _Size)

5. {

6. return HeapAlloc(GetProcessHeap(), 0, _Size);

7. }

9. void operator delete(void* ptr)

10. {

11. HeapFree(GetProcessHeap(), 0, ptr);

12. }

13.

14. class A

15. {

16. public:

17. virtual void foo(void) = 0;

18. };

19.

20. class B : public A

21. {

22. public:

23. void foo(void)

24. {

25. OutputDebugString(_T(“Hello, World!”));

26. }

27. };

28.

29. extern “C” void WinMainCRTStartup(void)

30. {

31. A* p = new B;

32. p->foo();

33. delete p;

34. }

Let me explain error.when we modify the Project Settings, in fact, that strip the project of the dependence to CRT .So, all of the codes are must be achieved by itself ,including new, delete and the program entry—winMainCRTStartup.After the code are input ,when we build the project ,we will get that link error.

Although the project are not built successfully, we still use the Disassembly tool to open the obj file produced by the code complier,where we can find all of the secrets .Then I will introduce simply the construction process of the object B, and won’t list the assembly code.

1. call new to apply memory space

2. call A::A,use the virtual table in A class to initialize the subobject of A class.

3. call B::B, use the virtual table in B class to initialize the object.

The problem appears in the step 2: A class is a pure virtual class .So what is its virtual table? I find the table in the obj file, as followings.

public ??_7A@@6B@
; const A::`vftable’
??_7A@@6B@ dd offset __purecall

As you can see, although A::foo is a pure virtual function, the compiler gave it a field in the virtual table, whose content just was replaced of the symbol named _purecall. Since the symbol _purecall exists in the default CRT, while we have stripped of the dependence to CRT, the error LNK 2001 appeared when we compiled link.

It is not hard to resolve the problem, in my opinion. You just prepare another simple _purecall.

View plain copy to clipboard print ?

1. extern ”C” int __cdecl _purecall(void)

2. {

3. return 0;

4. }

Besides, the C++ compiler in VS provides the special support in such cases. We can use _declspec(novtable) to define the pure virtual class of the novtable.So ,you can consider the following code to resolve the problem ,too .

view plain copy to clipboard print ?

1. class __declspec(novtable) A

2. {

3. public:

4. virtual void foo(void) = 0;

};

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How to achieve Ajax in Asp.net 2.0?

Jackson — Sat, 28 Nov 2009 01:10:46 +0000

ASP.NET 2.0 Client side Callbacks Framework
ASP.NET 2.0 has been released for a long time .The 2.0 framework has a great number of new features, one of which is Client side Callback. It can retrieve page values and populate them to an already-generated page with out reconstructing page. This makes it possible to use on a page with out going through the entire post back cycle; that means you can update your pages without completely redrawing the page. Client side Callback allows us to call the server-side methods without postback, which is consistent with the features of AJAX. However, AJAX can custom the method called that Callback of .NET 2.0 can not .The prerequisite to use Client Side Callback is to achieve System.Web.UI.IcallbackEventHandler interfaces, which contain two methods.
//call this method when the client callback
public void RaiseCallbackEvent(String eventArgument)
//After implementation of RaiseCallbackEvent , Call this method whose return value

// is sent back to the client side.
　　public string GetCallbackResult()
　　for example：
　　.cs：
　　String cbReference = Page.ClientScript.GetCallbackEventReference(
　　this,”arg”, “ReceiveServerData”, “context”);
　　String callbackScript;
　　callbackScript = “function CallServer(arg, context)” + “{ ” + cbReference + “} ;”;
　　Page.ClientScript.RegisterClientScriptBlock(
　　this.GetType(),”CallServer”, callbackScript, true);
　　javascript：

AJAX Introduction

AJAX is not a new programming language, but a new technique for creating better, faster, and more interactive web applications. With AJAX, a JavaScript can communicate directly with the server, with the XMLHttpRequest object. With this object, a JavaScript can trade data with a web server, without reloading the page.
AJAX uses asynchronous data transfer (HTTP requests) between the browser and the web server, allowing web pages to request small bits of information from the server instead of whole pages. The AJAX technique makes Internet applications smaller, faster and more user-friendly.
AJAX mechanism
When we used XmlHttp to achieve no-fresh page, we used XmlHttp to request a hidden page and Asp/Asp.Net of HttpHandler’own. Although in Ajax, we also request a hidden page ,the difference of the page of HttpHandler is achieved by ourselves.
Build your own AJAX:
1. Firstly we need to achieve a HttpHandler to respond the client’s request:
If we want to achieve self-define HttpHandler we should achieve IHttpHandler interfaces ,which contain a property and a method :
bool IHttpHandler.IsReusable
　　void IHttpHandler.ProcessRequest(HttpContext context)
　　Example:
　　bool IHttpHandler.IsReusable
　　{
　　get { return true; }
　　}
　　void IHttpHandler.ProcessRequest(HttpContext context)
　　{
　　context.Response.Clear(); // To obtain the method called
　　string methodName = context.Request.QueryString["me"];
　　//To obtain the assembly information
　　//Czhenq.AJAX.Class1.Dencode is self-defining string coding
string AssemblyName = Czhenq.AJAX.Class1.Dencode(context.Request.QueryString["as"]);
　　//acquire the parameters of the method
　　string Arguments = context.Request.QueryString["ar"]; //start to call the method
　　Type type = Type.GetType(AssemblyName);
　　MethodInfo method = type.GetMethod(methodName,
　　BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance);
　　if (method != null)
　　{
　　//The parameters are separated by “,”
　　string[] args = Arguments.Split(”,”.ToCharArray());
　　ParameterInfo[] paras = method.GetParameters();
　　object[] argument = new object[paras.Length];
　　for (int i = 0; i < argument.Length; i++)
　　{
　　if (i < args.Length) {
　　//As the parameters passed from XmlHttp are all string type, all of them are must converted .
//Here just convert the parameters into Int32
　　argument[i] = Convert.ToInt32(args[i]);
　　}
　　}
　　object value = method.Invoke(Activator.CreateInstance(type, true), argument);
　　if (value != null) context.Response.Write(value.ToString());
　　else context.Response.Write(”error”);
　　}
　　//end of process
　　context.Response.End();

2. Client side Javascript code:
function CallMethod(AssemblyName,MethodName,Argus)
　　{
　　var args = “”;
　　for(var i=0;i)
　　args += Argus[i] + “,”;
　　if(args.length>0) args = args.substr(0,args.length-1);
　　var xmlhttp = new ActiveXObject(’Microsoft.XMLHTTP’);
　　url = “AJAX/AJAX.czhenq?as=” + AssemblyName + “&me=” + MethodName +”&ar=”+ args;
　　xmlhttp.open(”POST”,url,false);
　　xmlhttp.send();
　　alert(xmlhttp.responseText);
　　}

3.We have achieved a simple AJAX framework. Now we need to write a piece of code to test it.
Use your own AJAX
1. New a website, and use your written HttpHandler, and register your HttpHandler on Web.config to explain that those requests will use your written Handler. The following description is all of request ending up with “czq” will use “Czhenq.HttpHandlerFactory” to deal with them.

2. Add a web page and copy the script to the page and add a method you want to call .
private string Add(int i, int j)
　　{　return TextBox1.Text;　　}
3. Place a HieddenField control on the page which is named AssemblyName.And add the following code in the Page_Load.
string assemblyName = Czhenq.AJAX.Class1.Encode(
　　typeof(_Default).AssemblyQualifiedName);
　　AssemblyName.Value = assemblyName;

4. Add the following script on the page
　var assemblyName = document.getElementById(”AssemblyName”);
　　var argus = new Array();
　　argus.push(”100″);
　　argus.push(”200″);
　　CallMethod(assemblyName,”Add”,argus)
Summarization
AJAX is not a new technology, which is just combination of some technology existed. In my opinion, AJAX is to encapsulate XmlHttp called by JavaScript, which just change the ways to write the code.

Encode and Decode:
public static string Encode(string value)
　　{
　　byte[] bytes = ASCIIEncoding.ASCII.GetBytes(value);
　　return Convert.ToBase64String(bytes);
　　}
　　public static string Dencode(string value)
　　{
　　byte[] bytes = Convert.FromBase64String(value);
　　return ASCIIEncoding.ASCII.GetString(bytes);
　　}

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Microsoft open source the .Net Micro Framework

Jackson — Thu, 26 Nov 2009 09:13:47 +0000

At PDC in Los Angeles, Microsoft announced that we are open sourcing the product and making it available under the Apache 2.0 license open source community which is already being used by the community within the embedded space. They also will create a community to help shape the future of the products.

However, the programmers in the embedded space could not too be happy. Because the complete code have not been provided .For example, can not be freed the TCP/IP protocol stack and Cryptography library of the third part EBSNET. In May, Microsoft announced that they would embrace open-source to make some of platforms as the projects supported by the society.

More detailed information, you can see

Microsoft to Open Source the .NET Micro Framework.

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SQL Server Compact on Windows 7 x 64-bit

Jackson — Wed, 25 Nov 2009 09:39:36 +0000

Today, when I use Visual Studio 2008 to develop a simple SQL Server Compact 3.1 application on Windows x64 platform, throws the following exception:

Message: “An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0×8007000B)”

StockTrace:

　　StockTrace

　　System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0×8007000B)

　　at System.Data.SqlServerCe.NativeMethods.CreateErrorInstance(IntPtr& pError)

　　at System.Data.SqlServerCe.SqlCeCommand..ctor()

at WindowsApplication1.NorthwindDataSetTableAdapters.EmployeesTableAdapter.InitAdapter() in D:\Documents\Visual Studio 2005\Projects\WindowsApplication1\WindowsApplication1\NorthwindDataSet.Designer.cs:line 6400

at WindowsApplication1.NorthwindDataSetTableAdapters.EmployeesTableAdapter.get_Adapter() in D:\Documents\Visual Studio 2005\Projects\WindowsApplication1\WindowsApplication1\NorthwindDataSet.Designer.cs:line 6324

at WindowsApplication1.NorthwindDataSetTableAdapters.EmployeesTableAdapter.Fill(EmployeesDataTable dataTable) in D:\Documents\Visual Studio 2005\Projects\WindowsApplication1\WindowsApplication1\NorthwindDataSet.Designer.cs:line 6607

at WindowsApplication1.Form1.Form1_Load(Object sender, EventArgs e) in D:\Documents\Visual Studio 2005\Projects\WindowsApplication1\WindowsApplication1\Form1.cs:line 29　

at System.Windows.Forms.Form.OnLoad(EventArgs e)

at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)

at System.Windows.Forms.Control.CreateControl()

at System.Windows.Forms.Control.WmShowWindow(Message& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Think it carefully .SQL Server Compact 3.5 SP1 just can support Win7 x 64 platform, SQL Server Compact 3.1 and 3.5 should run only through WOW64 mode .WOW64 is an Emulation Layer which allow 32-bit applications run on 64-bit platform. This seems that the 32-bit applications run on the 32-bit platform.

That problem is familiar on the internet .Generally speaking ,the answer is to install 64-edition SQL Server Compact 3.5 SP1.However ,what I need to resolve is SQL Server Compact 3.1 .What should we do ?

It is very simple. “Any CPU” is the default target platform Visual Studio 2005/2008 creates the project on. we just change it to be “x86”.So,the complied program will run through WOW64 mode.

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Encapsulate if/else, switch/case and While

Jackson — Fri, 20 Nov 2009 01:29:43 +0000

This article will discuss how to use extension method to encapsulate if/else,swith/case and while. Through these extensions the written code will seldom use curly brackets. What about this extension, maybe you have better advice .Please let me know.
Proclamation: This article just wanted to express a thought. And the code provided only an example, which can be tested successfully ,but imperfect.
Firstly, let us see if/else, and switch/case, both of which in the code are used as branched structure. Here, we encapsulate them into an “If “extension:

public static T If(this T t, Predicate predicate, Action action) where T: class

{

if(t == null) throw new ArgumentNullException();

if (predicate(t)) action(t);

return t;

}

See the following code to call, which will generate a people instance:

public static void Test1()

{

//General Code

People people1 = new People { Name = “ldp615″, IsHungry = true, IsThirsty = true, IsTired = true };

if (people1.IsHungry) people1.Eat();

if (people1.IsThirsty) people1.Drink();

if (people1.IsTired) people1.Rest();

people1.Work();

//Use extension method

People people2 = new People { Name = “ldp615″, IsHungry = true, IsThirsty = true, IsTired = true }

.If(p => p.IsHungry, p => p.Eat())

.If(p => p.IsThirsty, p => p.Drink())

.If(p => p.IsTired, p => p.Rest());

people2.Work();

}

We used Lambda expression in the If extension code .If the preceding “p=>p” can be moved ,it will be better.
The Class People is as follows:

public static void Test1()

{

//General code

People people1 = new People { Name = “ldp615″, IsHungry = true, IsThirsty = true, IsTired = true };

if (people1.IsHungry) people1.Eat();

if (people1.IsThirsty) people1.Drink();

if (people1.IsTired) people1.Rest();

people1.Work();

// /Use extension method

People people2 = new People { Name = “ldp615″, IsHungry = true, IsThirsty = true, IsTired = true }

.If(p => p.IsHungry, p => p.Eat())

.If(p => p.IsThirsty, p => p.Drink())

.If(p => p.IsTired, p => p.Rest());

people2.Work();

}

For the reference type, we can use Action, and also use chain programming mode to string several If. However, for a value type, we can use Func to return a new value every time.

public static T If(this T t, Predicate predicate, Func func) where T : struct

{

return predicate(t) ? func(t) : t;

}

It is necessary to modify the code called.

public static void Test2()

{

// /Use extension method

int int0 = -121;

int int1 = int0.If(i => i < 0, i => -i)

.If(i => i > 100, i => i - 100)

.If(i => i % 2 == 1, i => i - 1);

// General code

int int3 = -121;

if (int3 < 0) int3 = -int3;

if (int3 > 100) int3 -= 100;

if (int3 % 2 == 1) int3–;

}

The extension of the reference type and value type have been completed .Now ,we can use string to test it :

public static void Test3()

{

//Transform the mailbox into a home page .

string email = “ldp615@163.com”;

string page = email.If(s => s.Contains(“@”), s => s.Substring(0, s.IndexOf(“@”)))

.If(s =>! s.StartsWith(“www.”), s => s = “www.” + s)

.If(s =>! s.EndsWith(“.com”), s => s += “.com”);

}

But the compilation can not be passed, and prompt an error.
This error looks strange .We have written two extensions, one is for value type, other is for reference type. But the Class string can not be passed here.
However, we can write specifically an extension for string to resolve this problem. The code is as follows:

public static string If(this string s, Predicate<string> predicate, Func<string, string> func)

{

return predicate(s) ? func(s) : s;

}

From the above code, we find that there is a priority in the extension method: on the same class, we can do the extension for several times. When there is the same extension, equivalent parameters (the same number and sequence), and the priority of the non generic extension is higher than generic extension.
Let us see a swith code, which is very long-winded. In order to elicit extension, we had to write the following code:

public static void Test4()
{

string englishName = “apple”;

string Name = string.Empty;

switch (englishName)

{

case “apple”:

Name = “Apple”;

return;

case “orange”:

Name = “Orange”;

return;

case “banana”:

Name = “Banana”;

return;

case “pear”:

Name = “Pear”;

break;

default:

Name = “unknown”;

break;

}

Console.WriteLine(chineseName);

}

We use extension method to complete this way:

public static TOutput Switch(this TInput input, IEnumerable inputSource, IEnumerable outputSource, TOutput defaultOutput)

{

IEnumerator inputIterator = inputSource.GetEnumerator();

IEnumerator outputIterator = outputSource.GetEnumerator();

TOutput result = defaultOutput;

while (inputIterator.MoveNext())

{

if (outputIterator.MoveNext())

{

if (input.Equals(inputIterator.Current))

{

result = outputIterator.Current;

break;

}

else break;

}

return result;

}

The Test5 is used to call:

public static void Test5()

{

string englishName = “apple”;

string Name = englishName.Switch(

new string[] { “apple”, “orange”, “banana”, “pear” },

new string[] { “Apple”, “Orange”, “Banana”, “Pear” },

“unknown”

);

Console.WriteLine(Name);

}

It was simple and clear.
Finally, we’ll encapsulate the extension on while.

public static void While(this T t, Predicate predicate, Action action) where T: class
{

while (predicate(t)) action(t);

}

Calling code:

public static void Test6()

{

People people = new People { Name = “Wretch” };

people.While(

p => p.WorkCount < 7,

p => p.Work()

);

people.Rest();

}

In this while extension, we only perform an Action, which is not good to improve:

public static void While(this T t, Predicate predicate, params Action[] actions) where T : class

{

while (predicate(t))

{

foreach (var action in actions)

action(t);

}

Call again; we can perform multiple operations in the loop:

public static void Test7()

{

People people = new People { Name = “Wretch” };

people.While(

p => p.WorkCount < 7,

p => p.Work(),

p => p.Eat(),

p => p.Drink(),

p => p.Rest()

);

people.Rest();

}

Of course ,the previous If extension also can be like this .But here we just write one :

public static T If(this T t, Predicate predicate, params Action[] actions) where T : class

{

if (t == null) throw new ArgumentNullException();

if (predicate(t))

{

foreach (var action in actions)

action(t);

}

return t;

}

If you don’t want to use params, you need to display a statement about a set of Action.

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Windows Mobile Development in VS 2010

Jackson — Wed, 18 Nov 2009 09:14:54 +0000

Firstly, let us talk about what we can get benefit when we develop WM application by VS 2010.Of course, we had to talk about the Windows 7’s official sale and Visual Studio 2010 on-line, both of which belong to a series of products released by Microsoft. These new products will have high levels of integration and closer mutual support. For a developer, Development of uniform standards will bring not only convenience, but also high efficiency.
Take “Hello World” as an example. We just need to change PSTE of the application under Win32 edition as LPSTR, the program can be compiled and on.
Code:

#include

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

LPTSTR lpCmdLine, int nShowCmd)

{

MessageBox(NULL, TEXT(“Hello, Windows Mobile!”), TEXT(“HelloMsg”), 0);

return 0;

}

From this, we can find that Windows Mobile development is the same as the general Windows program development. We can get a handle on it without hard learning process. And we can use our familiar language.
With intelligence handset more and more popular and coupled with the arrival of 3G area, the demand to write the mobile applications will increase much.
Now, let us see a code in windows mobile by using c# to achieve cmnet link:

public bool Connectcmnetmethod(Guid destGuid, bool exclusive, bool mode)

{

connInfo.cbSize = (uint)Marshal.SizeOf(connInfo);

connInfo.dwParams = 0×1;//CONNMGR_PARAM_GUIDDESTNET;

connInfo.dwPriority = 0×08000;

connInfo.dwFlags = 0×1 | 0×2 | 0×4 | 0×8;//0;

connInfo.bExclusive = 0;// exclusive;

connInfo.bDisabled = 0;// false;

connInfo.guidDestNet = destGuid;

connInfo.hWnd = this.Handle;

if (mode == true)

{

result = ConnMgrEstablishConnectionSync(ref connInfo, ref hConnection, 10000, out dwStatus);

if (result != 0) MessageBox.Show(result.ToString(“X”), dwStatus.ToString(“X”));

return result == 0;

}

return false;

}

public struct CONNMGR_CONNECTIONINFO

{

public uint cbSize;

public uint dwParams;

public uint dwFlags;

public uint dwPriority;

public int bExclusive;

public int bDisabled;

public Guid guidDestNet;

public IntPtr hWnd;

public uint uMsg;

public uint lParam;

public uint ulMaxCost;

public uint ulMinRcvBw;

public uint ulMaxConnLatency;

}

[DllImport("cellcore.dll", EntryPoint = "ConnMgrEstablishConnectionSync", SetLastError = true)]

internal static extern int ConnMgrEstablishConnectionSync(ref CONNMGR_CONNECTIONINFO pConnInfo, ref IntPtr phConnection, int dwTimeout, out int dwStatus);

[DllImport("cellcore.dll", EntryPoint = "ConnMgrEstablishConnection", SetLastError = true)]

internal static extern int ConnMgrEstablishConnection(ref CONNMGR_CONNECTIONINFO pConnInfo, ref IntPtr phConnection);

[DllImport("cellcore.dll", EntryPoint = "ConnMgrReleaseConnection", SetLastError = true)]

internal static extern int ConnMgrReleaseConnection(IntPtr hConnection, int lCache);

[DllImport("coredll.dll")]

private static extern int CloseHandle(IntPtr hObject);

[DllImport("Coredll.dll", EntryPoint = "GetLastError", SetLastError = true)]

internal static extern int GetLastError();

private void menuItem1_Click(object sender, EventArgs e)

{

MessageBox.Show(Connect(new Guid(“7022E968-5A97-4051-BC1C-C578E2FBA5D9″), false, true).ToString());

}

Under Visual Studio 2010, it is very easy to write the simple, stable, efficient procedure. However, there are some problems .For example, the mobile have great resource consumption, and need to install the mobile version of the Framework program. The market share of the windows mobile is low, and there won’t be much demand to write the program in the short time.

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