获取 Windows 句柄的 WNDPROC
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Get the WNDPROC for windows handle
提问by Salvador
Exist any Windows api function to retrieve the WNDPROCfor a Windows Handle?
是否存在任何 Windows api 函数来检索WNDPROCWindows 句柄？
Thanks in advance.
提前致谢。
回答by Vlad
Use GetWindowLongPtr(hwnd, GWLP_WNDPROC).
使用GetWindowLongPtr(hwnd, GWLP_WNDPROC)。
Caution: GetWindowLongPtr is actually #defined to GetWindowLong for 32-bit systems, so in order to import it in Delphi you might need to use GetWindowLong instead. As well, GetWindowLongPtr itself is #defined to either GetWindowLongPtrA or GetWindowLongPtrW (for non-unicode and unicode targets), so again you might need to choose the right name manually for Delphi if the import system there is not really smart.
注意：#define对于 32 位系统，GetWindowLongPtr 实际上是 GetWindowLong 的 d，因此为了在 Delphi 中导入它，您可能需要改用 GetWindowLong。同样，GetWindowLongPtr 本身是#defineGetWindowLongPtrA 或 GetWindowLongPtrW（对于非 unicode 和 unicode 目标）的 d，因此如果导入系统不是真正智能，您可能需要再次为 Delphi 手动选择正确的名称。
Remember that if you are going to call the obtained window proc, you should do it using CallWindowProc. Thanks to @In silico for the hint.
请记住，如果您要调用获得的窗口过程，您应该使用CallWindowProc 来完成。感谢@In silico 的提示。
Please note that the value which is returned is not always the real pointer to the window procedure. Sometimes it's just a kind of handle which is recognized and correctly processed by CallWindowProc. For example, you'll not get the real function pointer if your application is ANSI, but the window belongs to a Unicode component (or vice versa). See this posting in The Old New Thingfor more details.
请注意，返回的值并不总是指向窗口过程的真正指针。有时它只是一种被CallWindowProc. 例如，如果您的应用程序是 ANSI，您将无法获得真正的函数指针，但窗口属于 Unicode 组件（反之亦然）。有关更多详细信息，请参阅The Old New Thing中的这篇帖子。
