组合Rgn不工作
我有两个区域：rgn1 和 rgn2。我想使用CombineRgn 函数将它们组合起来。所以我写 -
if CombineRgn(rgnMain,rgn1,rgn2,RGN_OR) = error then
ShowMessage('error');
它给出的返回值是错误的。
我已经测试过 rgn1 和 rgn2 是正确的区域。
谢谢。
I have two region say rgn1 and rgn2. I wanted to combine both of them using CombineRgn function. So I write -
if CombineRgn(rgnMain,rgn1,rgn2,RGN_OR) = error then
ShowMessage('error');
Its giving return value as ERROR.
I have tested that rgn1 and rgn2 are correct region.
Thank You.
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您还初始化了rgnMain吗？有点违反直觉（但如 CombineRgn() 文档中所述）目标/输出区域必须存在才能接收两个输入区域的所需组合，但它可以是一个完全空的区域：
如果您希望避免创建一个完全独立的区域，那么指定以下之一是可以接受的输入区域作为目标区域（根据定义，输入区域必须是现有的有效区域，这样就避免了必须单独初始化新的目标区域）：
Have you also initialised rgnMain? Somewhat counterintuitively (but as described in the documentation for CombineRgn()) the destination/output region must exist in order to receive the required combination of the two input regions, but it can be an entirely empty region:
If you wish to avoid having to create an entirely separate region then it is acceptable and possible to specify one of the input regions as the destination region (by definition an input region must be an existing, valid region so this avoids having to separately initialise a new destination region):