获取WM_NCHITTEST消息的坐标? [英] Get the coordinates of a WM_NCHITTEST message?
问题描述
我如何得到一个消息WM_NCHITTEST的坐标在C#代码?结果
我很想得到最快的方法,因为性能的要求。
How do I get the coordinates of a WM_NCHITTEST message in C# code?
I'd love to get the fastest way, because performance is a requirement.
推荐答案
从MSDN:
的wParam
此参数不被使用。
wParam
This parameter is not used.
的lParam 结果
中的低位字指定
光标的x坐标。的
坐标是相对于屏幕的
左上角。结果,
的高位字指定光标的
y坐标。在
坐标相对于屏幕的
左上角。
lParam
The low-order word specifies
the x-coordinate of the cursor. The
coordinate is relative to the
upper-left corner of the screen.
The high-order word specifies the
y-coordinate of the cursor. The
coordinate is relative to the
upper-left corner of the screen.
所以,你只需要提取消息的 lParam的
低阶和高阶的话:
So you just need to extract the low-order and high-order words from the message's lParam
:
int x = lParam.ToInt32() & 0x0000FFFF;
int y = (int)((lParam.ToInt32() & 0xFFFF0000) >> 16)
Point pos = new Point(x, y);
我不会太担心性能,因为这些操作都只是有点水平的算术...
I wouldn't worry too much about performance, since these operations are just bit level arithmetic...
请注意,这些坐标是相对于屏幕。如果你想坐标相对于对照(或形式),你可以使用 PointToClient
方法:
Note that these coordinates are relative to the screen. If you want coordinates relative to a control (or form), you can use the PointToClient
method:
Point relativePos = theControl.PointToClient(pos);
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