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SetBkColor 函数
设置标识的颜色值(如果设备不能展现，则使用最近的物理颜色)为当前背景颜色。
函数原型：
COLORREF SetBkColor (
HDC hdc,COLORREF crColor );
参数
返回值
类型：COLORREF
如果成功，返回标识的前一个背景颜色的 COLORREF 值。
如果失败，返回 CLR_INVALID。
如果失败，返回 CLR_INVALID。
支持
| 最低桌面系统支持 | Windows 2000 Professional |
| 头文件 | Wingdi.h (已包含在Windows.h中) |
| 库 | Gdi32.lib |
| DLL | Gdi32.dll |
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