C#获取Win10_64环境下登录的QQ号：遍历与操作

//直接可用代码，点击Button6_Click按钮为例，可支持win10_64
[DllImport("user32.dll", EntryPoint = "FindWindowA", CharSet = CharSet.Ansi)]
        private static extern int FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", EntryPoint = "GetWindowText")]
        public static extern int GetWindowText( int hwnd, StringBuilder lpString,  int cch  );
        [DllImport("user32.dll", EntryPoint = "GetWindow")]
        public static extern int GetWindow( int hwnd, int wCmd );

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

        private void Button6_Click(object sender, EventArgs e)
        {
          int  hWin = FindWindow("CTXOPConntion_Class", null);
            if ( hWin == 0) {
                return;
            }
            StringBuilder sbf = new StringBuilder(256);
            StringBuilder sbfClass = new StringBuilder(256);
            while (hWin>0) {
                GetWindowText(hWin, sbf, sbf.Capacity );
                if(sbf.ToString().Contains("OP_"))
                {
                    MessageBox.Show(sbf.ToString(), "");
                }
               
                do {
                    hWin = GetWindow(hWin, 2);
                    if (hWin == 0)