我如何在C＃中使用GetNextWindow（）？

问题描述

微软WinAPI的文件似乎表明，user32.dll中含有一种叫函数这理应使人们通过反复调用这个函数来枚举在其Z序打开的窗口。

The Microsoft WinAPI documentation appears to suggest that user32.dll contains a function called GetNextWindow() which supposedly allows one to enumerate open windows in their Z order by calling this function repeatedly.

通常给我一点的DllImport 语句中使用WinAPI的函数从C＃。然而，对于 GetNextWindow（）它没有一个条目。于是，我就建立我自己的：

Pinvoke usually gives me the necessary DllImport statement to use WinAPI functions from C#. However, for GetNextWindow() it doesn't have an entry. So I tried to construct my own:

[DllImport("user32.dll")]
static extern IntPtr GetNextWindow(IntPtr hWnd, uint wCmd);

不幸的是，试图调用这个的时候，我得到一个 EntryPointNotFoundException 说：

Unable to find an entry point named 'GetNextWindow' in DLL 'user32.dll'.

这似乎只适用于 GetNextWindow（）;这是对的PInvoke列出的其他功能都正常。我可以叫 GetTopWindow（）和 GetWindowText函数（）没有抛出异常。

This seems to apply only to GetNextWindow(); other functions that are listed on Pinvoke are fine. I can call GetTopWindow() and GetWindowText() without throwing an exception.

当然，如果你能提出一个完全不同的方式来枚举窗口在其当前Z序，我很高兴听到这一点。

Of course, if you can suggest a completely different way to enumerate windows in their current Z order, I'm happy to hear that too.

推荐答案

GetNextWindow（）其实就是 GetWindow（），而不是实际的API方法。它是与Win16的API向后兼容性。

GetNextWindow() is actually a macro for GetWindow(), rather than an actual API method. It's for backward compatibility with the Win16 API.

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);

enum GetWindow_Cmd : uint {
    GW_HWNDFIRST = 0,
    GW_HWNDLAST = 1,
    GW_HWNDNEXT = 2,
    GW_HWNDPREV = 3,
    GW_OWNER = 4,
    GW_CHILD = 5,
    GW_ENABLEDPOPUP = 6
}

（从）

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