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RegisterClassEx
注册一个窗口类，为以后调用 CreateWindow 或 CreateWindowEx 函数创建窗口提供基础。
函数原型：
ATOM WINAPI RegisterClassEx ( WNDCLASSEX * lpwcx );
参数
lpwcx
返回值
类型：ATOM
如果函数成功，返回值是一个标识被注册窗口类唯一的原子类型值。
如果函数失败，返回0。
如果函数失败，返回0。
备注
RegisterClassExA是 RegisterClass 函数的升级版。
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 | RegisterClassExW |
| ANSI版本名 | RegisterClassExA |
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