C#遍历进程获取主窗口句柄

当我们启动一个程序，用 Process process = Process.Start(path);//path是程序的绝对路径

启动时，获取的process.Handle其实是进程的句柄，并不是窗口的句柄，而有时process.MainWindowHandle却等于0

此时就需要用枚举来获取启动进程的主窗口句柄了，代码如下

 /// <summary>
    /// 用于枚举子窗体是的委托
    /// </summary>
    /// <param name="WindowHandle">窗体句柄</param>
    /// <param name="num">自定义</param>
    /// <returns></returns>
    public delegate bool EnumChildWindow(IntPtr WindowHandle, string num);
    /// <summary>
    /// 获取指定窗体的所有子窗体
    /// </summary>
    /// <param name="WinHandle">窗体句柄</param>
    /// <param name="ec">回调委托</param>
    /// <param name="name">自定义</param>
    /// <returns></returns>
    [DllImport("User32.dll")]
    public static extern int EnumChildWindows(IntPtr WinHandle, EnumChildWindow ecw, string name);
    /// <summary>
    /// 获取指定窗体的标题
    /// </summary>
    /// <param name="WinHandle">窗体句柄</param>
    /// <param name="Title">缓冲区取用于存储标题</param>
    /// <param name="size">缓冲区大小</param>
    /// <returns></returns>
    [DllImport("User32.dll")]
    public static extern int GetWindowText(IntPtr WinHandle, StringBuilder Title, int size);
    /// <summary>
    /// 获取窗体类型
    /// </summary>
    /// <param name="WinHandle">窗体句柄</param>
    /// <param name="Type">类型</param>
    /// <param name="size">缓冲区大小</param>
    /// <returns></returns>
    [DllImport("user32.dll")]
    public static extern int GetClassName(IntPtr WinHandle, StringBuilder Type, int size);

    /// <summary>
    /// 根据句柄获得进程id值
    /// </summary>
    /// <param name="handle">句柄</param>
    /// <param name="pid"></param>
    /// <returns></returns>
    [DllImport("user32")]
    private static extern int GetWindowThreadProcessId(IntPtr handle, out int pid);
 IntPtr mainHwnd = IntPtr.Zero;//登录窗口句柄
string typeName = string.Empty;//启动程序的窗口标题

   /// <summary>
    /// 枚举窗体
    /// </summary>
    /// <param name="handle"></param>
    /// <param name="num"></param>
    /// <returns></returns>
    private bool EnumChild(IntPtr handle, string num)
    {
        StringBuilder title = new StringBuilder();
        //StringBuilder type = new StringBuilder();
        title.Length = 100;
        //type.Length = 100;

        GetWindowText(handle, title, 100);//取标题
        //GetClassName(handle, type, 100);//取类型

        if (title.ToString() == typeName)
        {
            mainHwnd = handle;
            return false;
        }
        return true;
    }


//代码调用
pubilc boolTest()
{
       FileVersionInfo myFileVersion = FileVersionInfo.GetVersionInfo(path);
        typeName = myFileVersion.ProductName;//获取程序产品名称
int waitTime = 0;
     while (true)
            {
               
                EnumChildWindow ecw = new EnumChildWindow(EnumChild);
                EnumChildWindows(mainWindowHandle, ecw, "");

                GetWindowRect(mainHwnd.ToInt32(), ref rectMain);
                int pid = 0;
                GetWindowThreadProcessId(mainHwnd, out pid);
                //rectMain.Height - rectMain.Y < 300说明是登录窗口
                if (mainHwnd != IntPtr.Zero && process.Id == pid && rectMain.Height - rectMain.Y < 300)//276                
                    break;
                waitTime++;
                //30秒没打开程序，登录失败
                if (waitTime >= 30)
                    return false;
                Thread.Sleep(1000);
            }
return true;
}