线性回归r2计算公式FindWindow函数详解

2020年10月29日发(作者：和岘)
C#中使用FindWindow函数详解
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(
private static extern IntPtr FindWindow(string
lpClassName,string lpWindowName);
[DllImport(
private static extern IntPtr FindWindowEx(IntPtr hwndParent,
IntPtr hwndChildAfter, string lpClassName, string lpWindowName);
[DllImport(
private static extern IntPtr FindWindow(string
lpClassName,string lpWindowName);
[DllImport(
private static extern IntPtr FindWindowEx(IntPtr hwndParent,
IntPtr hwndChildAfter, string lpClassName, string lpWindowName);
2. 实例参考：
IntPtr hWnd = FindWindow(null,
这样会查找所有title是的窗口。
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(
version 2.0 software is running, call FindWindow as follows:
Copy Code
FindWindow(
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
9598Me Systems.
Example
For an example, see Retrieving the Number of Mouse Wheel Scroll Lines.
Function Information
Minimum DLL Version
Header Declared in Winuser.h, include Windows.h
Import library
Minimum operating systems Windows 95, Windows NT 3.1
Unicode Implemented as ANSI and Unicode versions.