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The GetClassInfo function retrieves information about a window class.

Declare Function GetClassInfo Lib "user32" Alias "GetClassInfoA" (ByVal hInstance As Long, ByVal lpClassName As String, lpWndClass As WNDCLASS) As Long

Operating Systems Supported
Requires Windows NT 3.1 or later; Requires Windows 95 or later


Parameter Information
- hInstance
Identifies the instance of the application that created the class. To retrieve information about classes defined by Windows (such as buttons or list boxes), set this parameter to NULL.

- lpClassName
Points to a null-terminated string containing the class name. The name must be that of a preregistered class or a class registered by a previous call to the RegisterClass function. Alternatively, this parameter can be an integer atom. If so, it must be a global atom created by a previous call to the GlobalAddAtom function. The atom, a 16-bit value less than 0xC000, must be in the low-order word of lpClassName; the high-order word must be zero.

- lpWndClass
Points to a WNDCLASS structure that receives the information about the class.

Return Values
If the function finds a matching class and successfully copies the data, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Last update: 07 April 2006