FindWindowEx孩子对话窗口 [英] FindWindowEx on child dialog window

问题描述

我试图得到一个子对话框窗口的句柄。我使用FindWindowEx尝试过，但没有奏效。相反，FindWindow函数所做的工作。

I'm trying to get the handle of a child dialog window. I've tried using FindWindowEx, but it didn't work. Instead, FindWindow did work.

我做了与Visual Studio的选项窗口一个实验，用下面的代码：

I did an experiment with visual studio's options window, with the following code:

IntPtr vsHandle = Process.GetProcessById(vsProcessId).MainWindowHandle; // consistent with spy++'s parent handle of options window

IntPtr optionsHandle = FindWindowEx(vsHandle, IntPtr.Zero, "#32770", "Options"); // returns 0

IntPtr optionsHandle2 = FindWindow("#32770", "Options"); // returns correct handle

从我的理解，应该FindWindowEx工作过，这是一个子窗口。

From my understanding, FindWindowEx should've worked, it is a child window.

我运行Windows XP，并且也使用FindWindowEx试过（vsHandle，IntPtr.Zero，＃32770，NULL）。没有工作。 。好像得到它使用FindWindow函数这是不够好，与同一个对话框两家母公司实例可以是开放的唯一途径。

I'm running windows xp, and have also tried using FindWindowEx(vsHandle, IntPtr.Zero, "#32770", null). Didn't work. Seems like the only way to get it is using FindWindow which isn't good enough as two parent instances with the same dialog can be open.

这是声明：

[DllImport("user32.dll")]
Private static extern IntPtr FindWindow(string className, string windowTitle);
[DllImport("user32.dll")]
Private static extern IntPtr FindWindowEx(IntPtr parentHWnd, IntPtr childAfterHWnd,     string className, string windowTitle);

先谢谢了。

Thanks in advance.

推荐答案

我找到了解决这个。究其原因FindWindowEx没有工作，是因为它只能在具有WS_CHILD风格，显然对话窗口没有这种风格的子窗口。这就是为什么EnumChildWindows将无法正常工作是（我试过）。

I found a solution to this. The reason FindWindowEx didn't work was because it only works on child windows that have WS_CHILD style, and apparently dialog windows do not have this style. It is why EnumChildWindows won't work either (I've tried).

因此，丑陋的解决方案是用EnumWindows的结合的getParent比较手柄和文字。

So the ugly solution is EnumWindows combined with GetParent to compare the handle and the text.

        struct SearchData
        {
            public string WindowText;
            public IntPtr ParentHandle;
            public IntPtr ResultHandle;
        }

        delegate bool EnumWindowsCallback(IntPtr currentWindowHandle, ref SearchData searchData);

        [DllImport("user32.dll")] static extern bool EnumWindows(EnumWindowsCallback callback, ref SearchData searchData);

        [DllImport("user32.dll")] static extern IntPtr GetParent(IntPtr childHandle);

        [DllImport("user32.dll")] static extern void GetWindowText(IntPtr handle, StringBuilder resultWindowText, int maxTextCapacity);


        static bool Callback(IntPtr currentWindowHandle, ref SearchData searchData)
        {
            bool continueEnumeration = true;

            IntPtr currentWindowParentHandle = GetParent(currentWindowHandle);

            if (currentWindowParentHandle == searchData.ParentHandle)
            {
                var windowText = new StringBuilder(1024);
                GetWindowText(currentWindowHandle, windowText, windowText.Capacity);

                if (windowText.ToString() == searchData.WindowText)
                {
                    searchData.ResultHandle = currentWindowHandle;
                    continueEnumeration = false;
                }
            }

            return continueEnumeration;
        }


        IntPtr GetChildWindowHandle(string windowText, IntPtr parentHandle)
        {
            var searchData = new SearchData{ParentHandle=parentHandle, WindowText=windowText};

            EnumWindows(Callback, ref searchData);

            return searchData.ResultHandle;
        }

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