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UnregisterClass The UnregisterClass function removes a window class, freeing the memory required for the class.
VB4-32,5,6
Declare Function UnregisterClass Lib "user32" Alias "UnregisterClassA" (ByVal lpClassName As String, ByVal hInstance As Long) As Long |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 95 or later |
- lpClassName
Points to a null-terminated string or is an integer atom. If lpClassName is a string, it specifies the window class name. This class name must have been registered by a previous call to the RegisterClass function. System global classes, such as dialog box controls, cannot be unregistered.
If this parameter is an integer atom, it must be a global atom created by a previous call to the RegisterClass 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.
- hInstance
Identifies the instance of the module that created the class. |
If the function succeeds, the return value is nonzero.
If the class could not be found or if a window still exists that was created with the class, the return value is zero. To get extended error information, call GetLastError. |
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