2024年3月21日发(作者：)
C#中使用FindWindow函数详解从标题获取句柄
FindWindow用来根据类名和窗口名来得到窗口句柄的。但是这个函数
不能查找子窗口，也不区分大小写。
如果要从一个窗口的子窗口中查找需要使用FindWindowEX。
1.在C#中使用方法如下：
[DllImport("User3", EntryPoint = "FindWindow")]
private static extern IntPtrFindWindow(string
lpClassName,stringlpWindowName);
[DllImport("User3", EntryPoint = "FindWindowEx")]
private static extern IntPtrFindWindowEx(IntPtrhwndParent,
IntPtrhwndChildAfter, string lpClassName, string lpWindowName);
[DllImport("User3", EntryPoint = "FindWindow")]
private static extern IntPtrFindWindow(string
lpClassName,stringlpWindowName);
[DllImport("User3", EntryPoint = "FindWindowEx")]
private static extern IntPtrFindWindowEx(IntPtrhwndParent,
IntPtrhwndChildAfter, string lpClassName, string lpWindowName);
2. 实例参考：
IntPtrhWnd = FindWindow(null, "test Demo");
这样会查找所有title是"test Demo"的窗口。
参考下面的资料解释
3. FindWindow参数详解：
Parameters
lpClassName
[in] Pointer to a null-terminated string that specifies the class name or
a class atom created by a previous call to the RegisterClass or
RegisterClassEx function. The atom must be in the low-order word of
lpClassName; the high-order word must be zero.
If lpClassName points to a string, it specifies the window class name.
The class name can be any name registered with RegisterClass or
RegisterClassEx, or any of the predefined control-class names.
If lpClassName is NULL, it finds any window whose title matches the
lpWindowName parameter.
lpWindowName
[in] Pointer to a null-terminated string that specifies the window name
(the window's title). If this parameter is NULL, all window names
match.
Return Value
If the function succeeds, the return value is a handle to the window
that has the specified class name and window name.
If the function fails, the return value is NULL. To get extended error
information, call GetLastError.
Remarks
If the lpWindowName parameter is not NULL, FindWindow calls the
GetWindowText function to retrieve the window name for comparison.
For a description of a potential problem that can arise, see the
Remarks for GetWindowText.
To check if the Microsoft IntelliType version 1.x software is running,
call FindWindow as follows:
Copy Code
FindWindow("MSITPro::EventQueue",NULL); To check if the
IntelliType version 2.0 software is running, call FindWindow as
follows:
Copy Code
FindWindow("Type32_Main_Window", NULL); If the IntelliType
software is running, it sends WM_APPCOMMAND messages to the
application. Otherwise the application must install a hook to receive
WM_APPCOMMAND messages.
Microsoft Windows 95 or later: FindWindowW is supported by the
Microsoft Layer for Unicode (MSLU). To use this, you must add
certain files to your application, as outlined in Microsoft Layer for
Unicode on Windows 95/98/Me Systems.
Example
For an example, see Retrieving the Number of Mouse Wheel Scroll
Lines.
Function Information
Minimum DLL Version user3
Header Declared in Winuser.h, include Windows.h
Import library User3
Minimum operating systems Windows 95, Windows NT 3.1
Unicode Implemented as ANSI and Unicode versions.
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