通过FindWindowEx获取所有控件 [英] get all controls by FindWindowEx

问题描述

我正在构建一个应用程序，它会得到所有的控制已经进入应用程序winform正在运行。首先，我可以注入dll到应用程序winform正在运行，并获得应用程序winform正在运行的句柄。后我得到所有的孩子窗口进入应用。接下来，我想通过FindWindowEx将所有控件都放到子窗口中。但我不能

I am building an applicaton, It will get all control have into application winform is running. First, I can inject dll into application winform is running and get handle of application winform is running. After I get all child window into applcation. Next, I want get all controls into child window by FindWindowEx. But I can't

这里是代码：

static ArrayList GetAllChildrenWindowHandles(IntPtr hParent, int maxCount)
    {
        ArrayList result = new ArrayList();
        int ct = 0;
        IntPtr prevChild = IntPtr.Zero;
        IntPtr currChild = IntPtr.Zero;
        while (true && ct < maxCount)
        {
            currChild = FindWindowEx(hParent, prevChild, null, null);
            if (currChild == IntPtr.Zero)
            {
                int errorCode = Marshal.GetLastWin32Error();
                break;
            }
            result.Add(currChild);
            prevChild = currChild;
            ++ct;
        }
        return result;
    }

我得到一个子窗口的句柄，但我不能通过FindWindowEx的所有控制到子窗口。
对不起我的英语

I get a handle of child window and use it is parent. But I can't get all control into child window by FindWindowEx . Sorry for my english

推荐答案

您可以使用下面的代码。把它放在一个帮助类的某个地方，使用它像这样...

You can use the code below. Put it into a helper class somewhere, and e.g. use it like this...

var hwndChild = EnumAllWindows(hwndTarget, childClassName).FirstOrDefault();  

您可以'输掉' class 如果你愿意 - 但通常你正在检查一个特定的目标。

You can 'lose' the class check if you wish - but usually you're checking for a specific target.

您可能也想检查这篇文章我做了一段时间 - 这是使用
此方法设置一个焦点远程窗口（这些情况是
很常见，你会迟早击中那个钩子）。

Pinvoke SetFocus到特定控件

public delegate bool Win32Callback(IntPtr hwnd, IntPtr lParam);

[DllImport("user32.Dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool EnumChildWindows(IntPtr parentHandle, Win32Callback callback, IntPtr lParam);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern IntPtr GetClassName(IntPtr hWnd, System.Text.StringBuilder lpClassName, int nMaxCount);

private static bool EnumWindow(IntPtr handle, IntPtr pointer)
{
    GCHandle gch = GCHandle.FromIntPtr(pointer);
    List<IntPtr> list = gch.Target as List<IntPtr>;
    if (list == null)
        throw new InvalidCastException("GCHandle Target could not be cast as List<IntPtr>");
    list.Add(handle);
    return true;
}

public static List<IntPtr> GetChildWindows(IntPtr parent)
{
    List<IntPtr> result = new List<IntPtr>();
    GCHandle listHandle = GCHandle.Alloc(result);
    try
    {
        Win32Callback childProc = new Win32Callback(EnumWindow);
        EnumChildWindows(parent, childProc, GCHandle.ToIntPtr(listHandle));
    }
    finally
    {
        if (listHandle.IsAllocated)
            listHandle.Free();
    }
    return result;
}

public static string GetWinClass(IntPtr hwnd)
{
    if (hwnd == IntPtr.Zero)
        return null;
    StringBuilder classname = new StringBuilder(100);
    IntPtr result = GetClassName(hwnd, classname, classname.Capacity);
    if (result != IntPtr.Zero)
        return classname.ToString();
    return null;
}

public static IEnumerable<IntPtr> EnumAllWindows(IntPtr hwnd, string childClassName)
{
    List<IntPtr> children = GetChildWindows(hwnd);
    if (children == null)
        yield break;
    foreach (IntPtr child in children)
    {
        if (GetWinClass(child) == childClassName)
            yield return child;
        foreach (var childchild in EnumAllWindows(child, childClassName))
            yield return childchild;
    }
}

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