private void loginBtn_Click(object sender, EventArgs e) { SdkClass.NET_DVR_DEVICEINFO_V30 deviceinfo = new SdkClass.NET_DVR_DEVICEINFO_V30(); //登录相机 if ((iUid = SdkClass.NET_DVR_Login_V30(this.ipAddress.Text, 8000, this.txtUsername.Text, this.txtPsd.Text, deviceinfo)) < 0) { MessageBox.Show("登录失败!"); } else { this.loginBtn.Enabled = false; this.initBtn.Enabled = false; this.alarmBtn.Enabled = true; this.closealarmBtn.Enabled = false; this.quitBtn.Enabled = true; this.btnStartListen.Enabled = true; this.btnStopListen.Enabled = false; this.btnLoginOut.Enabled = true; this.btnSetParam.Enabled = true; MessageBox.Show("登录成功!"); } }