令人沮丧的处理窗口消息（WM_XX）
我正在尝试使用普通的 WinAPI 为自己创建一个 GUI 库。但我发现处理 Window Message 真的很令人沮丧。
例如，我可以看到，当我将鼠标移到窗口上时，WM_NCHITTEST 将在 WM_MOUSEMOVE 之前发送给我。 但是，如果我按下左按钮，四处移动，然后释放左按钮。然后我只收到 WM_MOUSEMOVE 之后。可能是因为我在收到 WM_LBUTTONDOWN 时调用 SetFocus(HWND)、SetCapture(HWND) 和在收到 WM_LBUTTONUP 时调用 ReleaseCapture(HWND)
这些不同的行为对我来说似乎很模糊。我想知道是否有任何文档/文章解释有关这些窗口消息的详细信息。至少告诉我应该注意什么。 （Charles的“Programming Windows”对我不起作用，因为它只介绍了这些消息的基础，但没有告诉我像我提到的WM_NCHITTEST / WM_MOUSEMOVE那样的陷阱）
I'm trying to make myself a GUI library using plain WinAPI. But I found that dealing with Window Message really frustrating.
For example, I can see that when I move my mouse over my window, WM_NCHITTEST will send to me before WM_MOUSEMOVE.
But if I press down the left button, move around, then release the left button. Then I only receive WM_MOUSEMOVE afterward. Possibly it was because I call SetFocus(HWND), SetCapture(HWND) when receive WM_LBUTTONDOWN and ReleaseCapture(HWND) when receive WM_LBUTTONUP
These different behaviors seem like a mist to me. I wonder is there any documentation / article explaining the details about these Window Message. At least, tell me what I should pay attention to. (Charles's "Programming Windows" doesn't work for me, because it only introduce the basis about those messages, but not telling me traps like I mention about the WM_NCHITTEST / WM_MOUSEMOVE)
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通过说
SetCapture(HWND)，您要求系统将所有鼠标消息重定向到您的窗口，直到您调用ReleaseCapture(HWND)。当某个窗口捕获鼠标输入（因此所有消息都重定向到那里）时，无需发送WM_NCHITTEST。如果需要，您可以自行向鼠标下的窗口发送WM_NCHITTEST。
By saying
SetCapture(HWND)you asking system to redirect all mouse messages to your window until you callReleaseCapture(HWND). When mouse input is captured (so all messages redirected there) by some window there is no need to sendWM_NCHITTEST.If needed you can send WM_NCHITTEST to windows under the mouse by yourself.
http://msdn.microsoft.com/en-us/库/ms645618(VS.85).aspx
http://blogs.msdn.com/b/oldnewthing/archive/2011/02/18/10131176.aspx
WM_NCHITTEST 用于命中测试。它仅在需要时发送。 MSDN 上有每条消息的文档。还有关于鼠标输入的部分 http:// msdn.microsoft.com/en-us/library/ms645533(v=VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms645618(VS.85).aspx
http://blogs.msdn.com/b/oldnewthing/archive/2011/02/18/10131176.aspx
WM_NCHITTEST is for hit-testing. It only gets sent when needed. MSDN has documentation on each message. There is also a section on mouse input http://msdn.microsoft.com/en-us/library/ms645533(v=VS.85).aspx