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SetBkMode 函数
设置指定设备环境的背景混合模式。
函数原型：
COLORREF SetBkMode (
HDC hdc,int iBkMode );
参数
hdc
类型：HDC
设备环境句柄
iBkMode
类型：int
背景模式，参数可能是以下值之一：
●OPAQUE： 在文本、画刷或画笔被绘制之前用当前背景颜色填充背景
●TRANSPARENT：背景保持不变(透明)
●OPAQUE： 在文本、画刷或画笔被绘制之前用当前背景颜色填充背景
●TRANSPARENT：背景保持不变(透明)
返回值
类型：COLORREF
如果成功，返回标识的前一个文本颜色的 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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