Call the Win32 function EnumWindows in C # to enumerate all windows

We all know that in Microsoft. Net, C # is the first language used to develop network solutions. But in the fat client, C # also has outstanding performance. For programmers familiar with Win32 APIs, the key is how to integrate the new features of C # With Win32 APIs.

The following example shows how to call Win32 API-EnumWindows in C # to enumerate all windows:

1. First, you must declare a delegate function for the callback function of Win32 API-EnumWindows:

Public delegate bool CallBack (int hwnd, int lParam );

2. Then, use the platform CALL statement in C # To call API-EnumWindows from the USER32.DLL library. For detailed parameters, see MSDN-Win32 API.

[DllImport ("user32")]

Public static extern int EnumWindows (CallBack x, int y );

3. Finally, instantiate the delegate and call EnumWindows.

CallBack myCallBack = new CallBack (EnumWindowsApp. Report );

4. complete code is as follows:

Using System;

Using System. Runtime. InteropServices;

Public delegate bool CallBack (int hwnd, int lParam );

Public class EnumWindowsApp

{

[DllImport ("user32")]

Public static extern int EnumWindows (CallBack x, int y );

Public static void Main ()

{

CallBack myCallBack = new CallBack (EnumWindowsApp. Report );

EnumWindows (myCallBack, 0 );

}

Public static bool Report (int hwnd, int lParam)

{

Console. Write ("Window handle is :");

Console. WriteLine (hwnd );

Return true;

}

}

Note: For more information about "delegation", "platform call", and "instantiation", see Visual. Net Help.