c#应用程序中的SetWindowHookEx在运行时失败

我正在构建一个应用程序使用钩子，我想启动另一个应用程序，在我构建我的应用程序和应用程序将获得另一个应用程序和setwindowhook的自动化窗口句柄后。但是我做不到。请帮帮我。我的英语水平

变量窗口是hwnd当我得到所有的应用程序是windowform正在运行

private bool AddWnd(int hwnd, int lparam)
{
    if (IsWindowVisible(hwnd))
    {
        StringBuilder sb = new StringBuilder(255);
        string className = GetClassName((IntPtr)hwnd).ToString();
        if (className.Length > 10)
        {
            string getSubStringClassName = className.Substring(0, 11);
            if (getSubStringClassName.Equals("WindowsForm") && IsWindow(hwnd)!=0)
            {
                GetWindowText(hwnd, sb, sb.Capacity);
                window = hwnd;
            }
        }
    }
    return true;
}
HookProc HookProcedure;
private const int WH_CBT = 5;
public void startHook()
{
    if (hHook == 0)
    {
        HookProcedure = new HookProc(CbtHookProc);
        int threadID = GetWindowThreadProcessId((IntPtr)window, out processHandle);
        IntPtr hMod = System.Runtime.InteropServices.Marshal.GetHINSTANCE(typeof(Form1).Module);
        hHook = SetWindowsHookEx(WH_CBT, HookProcedure, hMod, threadID);
        if (hHook == 0)
        {
            MessageBox.Show("SetWindowsHookEx Failed");
            return;
        }
    }
    else
    {
        bool ret = UnhookWindowsHookEx(hHook);
        //If the UnhookWindowsHookEx function fails.
        if (ret == false)
        {
            MessageBox.Show("UnhookWindowsHookEx Failed");
            return;
        }
        hHook = 0;
        button1.Text = "Set Windows Hook";   
    }
}