FindWindow function
Applies to: desktop apps only
Retrieves a handle to the top-level window whose class name and window name match the specified strings. This function does not search child windows. This function does not perform a case-sensitive search.
To search child windows, beginning with a specified child window, use the FindWindowEx function.
Syntax
HWND WINAPI FindWindow( __in_opt LPCTSTR lpClassName, __in_opt LPCTSTR lpWindowName );
Parameters
- lpClassName [in, optional]
-
Type: LPCTSTR
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, optional]
-
Type: LPCTSTR
The window name (the window's title). If this parameter is NULL, all window names match.
Return value
Type:
Type: HWND
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.
Examples
For an example, see Retrieving the Number of Mouse Wheel Scroll Lines.
Requirements
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Minimum supported client | Windows 2000 Professional |
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Minimum supported server | Windows 2000 Server |
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Header |
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Library |
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DLL |
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Unicode and ANSI names | FindWindowW (Unicode) and FindWindowA (ANSI) |
See also
- Reference
- EnumWindows
- FindWindowEx
- GetClassName
- GetWindowText
- RegisterClass
- RegisterClassEx
- Conceptual
- Windows
Send comments about this topic to Microsoft
Build date: 2/3/2012
- 7/26/2011
- rengaw03
[DllImport("user32.dll")]
public static extern IntPtr FindWindow(String sClassName, String sAppName);
Example:
IntPtr hwnd=FindWindow(null,"Form1");
"Form1" is the Text property of the window.
Along with "EnableWindow(..)" , this function can be used to lock a perticular window.
Example:
[DllImport("user32.dll")]
public static extern bool EnableWindow(IntPtr hwnd, bool bEnable);
public void SampleFunction()
{
IntPtr hwnd=FindWindow(null,"Form1");
EnableWindow(hwnd,false);//to unlock set the boolean value to true
}
- 9/17/2010
- Pramodh T S
- 7/20/2011
- kaka2011-07-20
- 12/22/2010
- ychch
