c# - 通过 FindWindowEx 获取所有控件

Question

我正在构建一个应用程序，它将获得所有对应用程序 winform 运行的控制。首先，我可以将 dll 注入(inject)正​​在运行的应用程序 winform 并获取正在运行的应用程序 winform 的句柄。在我将所有子窗口放入应用程序之后。接下来，我想通过 FindWindowEx 将所有控件放入子窗口。但是我不能

代码如下:

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;
    }

我得到子窗口的句柄并将其用作父窗口。但是我无法通过 FindWindowEx 将所有控件都控制到子窗口中。对不起我的英语

Answer 1

您可以使用下面的代码。把它放到某个地方的辅助类中，例如像这样使用它......

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

如果您愿意，您可以“丢失”class 检查 - 但通常您是在检查特定目标。

You may also wanna check this post I made a while go - which is using this method to set a focus on a remote window (and those scenarios are quite common, and you'll hit that snag sooner or later).
Pinvoke SetFocus to a particular control

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;
    }
}