C＃Process.MainWindowHandle总是返回零的IntPtr(C# Process.

这是我的代码：

            using (Process game = Process.Start(new ProcessStartInfo() { 
        FileName="DatabaseCheck.exe",
        RedirectStandardOutput = true,
        CreateNoWindow = true,
        UseShellExecute = false }))
        {
            lblLoad.Text = "Loading";
            int Switch = 0;

            while (game.MainWindowHandle == IntPtr.Zero)
            {
                Switch++;
                if (Switch % 1000 == 0)
                {
                    lblLoad.Text += ".";
                    if (lblLoad.Text.Contains("...."))
                        lblLoad.Text = "Loading.";

                    lblLoad.Update();
                    game.Refresh();
                }
            }

问题是，game.MainWindowHandle总是IntPtr.Zero。 我需要找到RAN过程的IntPtr的确认，该游戏是由启动器启动的，所以我做游戏送它的IntPtr，让发射器响应，如果它的好。 但对于这一点，我必须知道跑过程中的IntPtr特别。

提前致谢！

Answer 1:

The main window is the window opened by the process that currently has the focus (the TopLevel form). You must use the Refresh method to refresh the Process object to get the current main window handle if it has changed.

You can get the MainWindowHandle property only for processes that are running on the local computer. The MainWindowHandle property is a value that uniquely identifies the window that is associated with the process.

A process has a main window associated with it only if the process has a graphical interface. If the associated process does not have a main window, the MainWindowHandle value is zero. The value is also zero for processes that have been hidden, that is, processes that are not visible in the taskbar. This can be the case for processes that appear as icons in the notification area, at the far right of the taskbar.

If you have just started a process and want to use its main window handle, consider using the WaitForInputIdle method to allow the process to finish starting, ensuring that the main window handle has been created. Otherwise, an exception will be thrown.

Answer 2:

一种解决方法是通过枚举所有顶级窗口，直到你找到一个匹配审视自己的进程ID ...

    [DllImport("user32.dll")]
    public static extern IntPtr FindWindowEx(IntPtr parentWindow, IntPtr previousChildWindow, string windowClass, string windowTitle);

    [DllImport("user32.dll")]
    private static extern IntPtr GetWindowThreadProcessId(IntPtr window, out int process);

    private IntPtr[] GetProcessWindows(int process) {
        IntPtr[] apRet = (new IntPtr[256]);
        int iCount = 0;
        IntPtr pLast = IntPtr.Zero;
        do {
            pLast = FindWindowEx(IntPtr.Zero, pLast, null, null);
            int iProcess_;
            GetWindowThreadProcessId(pLast, out iProcess_);
            if(iProcess_ == process) apRet[iCount++] = pLast;
        } while(pLast != IntPtr.Zero);
        System.Array.Resize(ref apRet, iCount);
        return apRet;
    }

Answer 3:

while (!proc.HasExited)
{
    proc.Refresh();
    if (proc.MainWindowHandle.ToInt32() != 0)
    {
        return proc.MainWindowHandle;
    }
}

文章来源: C# Process.MainWindowHandle always returns IntPtr Zero