使用 WHITE_BRUSH 填充矩形在 WinCE 6.0 上失败
我试图用“但是它“成功”（返回非零）来清除屏幕的一部分，
FillRect(hdc, &r, (HBRUSH)(WHITE_BRUSH))
但不会在屏幕上写入任何内容。如果我将其更改为
FillRect(hdc, &r, (HBRUSH)(WHITE_BRUSH+1))
它，它会神奇地开始工作，但现在它会以浅灰色清除屏幕。我在这里缺少什么吗？
I'm attempting to clear part of my screen with
FillRect(hdc, &r, (HBRUSH)(WHITE_BRUSH))
However it "succeeds" (returns nonzero) but writes nothing to the screen. If I change it to
FillRect(hdc, &r, (HBRUSH)(WHITE_BRUSH+1))
it magically starts working, except now it's clearing the screen with a slight gray color. Is there something I am missing here?
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画笔常量不保证是有效的句柄；您应该使用
GetStockObject来将常量转换为句柄。WHITE_BRUSH+1的计算结果似乎有效，这可能只是巧合。The brush constants are not guaranteed to be valid handles; you're supposed to use
GetStockObjectto convert the constant to a handle. It's probably just a coincidence thatWHITE_BRUSH+1evaluates to something that appears to work.