BOOL UnregisterClass(lpClassName,hInstance)
This function removes the window class specified by lpClassName from the window-class table, freeing the storage required for the class.
| Parameter | Type/Description |
| lpClassName | LPSTR Points to a null-terminated string containing the class name. This class name must have been previously registered by calling the RegisterClass function with a valid hInstance field in the WNDCLASS structure parameter. Predefined classes, such as dialog-box controls, may not be unregistered. | |
| hInstance | HANDLE Identifies the instance of the module that created the class. |
The return value is TRUE if the function successfully removed the window class from the window-class table. It is FALSE if the class could not be found or if a window exists that was created with the class.
Before using this function, destroy all windows created with the specified class.