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UnregisterClass
解除窗口类的注册，并释放其所占用的内存。
函数原型：
BOOL WINAPI UnregisterClass ( LPCTSTR lpClassName, HINSTANCE hInstance );
参数
lpClassName
类型：LPCTSTR
以空字符结尾的字符串或窗口类的注册原子值。如果是字符串，此参数标识已经被 RegisterClass 或 RegisterClassEx 注册过的窗口类名。注意，系统窗口类，如菜单、对话框、控件等窗口类名不允许解除注册。如果是窗口类原子值，则必须是之前调用 RegisterClass 或 RegisterClassEx 的返回值。原子值必须在此参数的低16位中，高16位必须为0。
hInstance
类型：HINSTANCE
创建窗口类所在模块的实例句柄。
返回值
类型：BOOL
如果成功，返回非0。
如果失败，返回0。
如果失败，返回0。
支持
| 最低桌面系统支持 | Windows 2000 Professional |
| 头文件 | Winuser.h (已包含在Windows.h中) |
| 库 | User32.lib |
| DLL | User32.dll |
| UNICODE版本名 | UnregisterClassW |
| ANSI版本名 | UnregisterClassA |
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