private void button1_Click(object sender, EventArgs e)
 {
     if (HCNetSDK.NET_DVR_Init())
     {
         NET_DVR_DEVICEINFO_V30 device = new NET_DVR_DEVICEINFO_V30();
         if (HCNetSDK.NET_DVR_Login_V30(textIP.Text.Trim(), 8870, "admin", "12345", ref device) == 0)
         {
             MessageBox.Show("连接成功");
         }
         else
         {
             MessageBox.Show("连接失败");
         }
     }
     else
     {
         MessageBox.Show("初始化失败");
     }
 }