Develop a RDP client in QT

[P25B]

Hi all,

I need to develop a QT/C++ application from which I could connect to another PC over RDP. I have been searching and I found that if I use QAxWidget it allows me to select the Active X control type and the Microsoft RDP COM Object is eligible. However, I am quite new in QT, and I have a few questions. Up to now, I tried to set the IP, the user and try to connect by the following code but, nothing really has happened (no errors, no debugging comments but it does nothing):

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->RDP_Viewer->setControl(QString::fromUtf8("{301B94BA-5D25-4A12-BFFE-3B6E7A616585}"));
    ui->RDP_Viewer->setProperty("Server", "XXX.XXX.XXX.XXX");
    ui->RDP_Viewer->setProperty("UserName", "User");
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    ui->RDP_Viewer->dynamicCall("Connect()");
}

So, what I am doing wrong?
There is something missing?

If someone could help me I would appreciate.

Thanks in advanced,

[P25B]

Hi all,

I will appreciate any other possible solution, even if it means to start from scratch.

Thank you for your help

[jsulm]

@P25B I'm not a RDP expert, but don't you have to authenticate you (password?)?

[P25B]

Hi @jsulm

As long as I know, once you connect the password is asked. At least the rdp client of windows works like that.

[JonB]

@P25B
I don't think we know the details of how the MS RDP ActiveX control works. For example, maybe your usage falls foul of https://docs.microsoft.com/en-us/windows/win32/termserv/providing-for-rdp-client-security. There seems to be an awful lot to read through starting from https://docs.microsoft.com/en-us/windows/win32/termserv/remote-desktop-activex-control plus all related sections. I could not spot simple example code of what they said is required to set up a connection successfully. Where did you get your code from for your simple way of setting up to call this RDP_Viewer->dynamicCall("Connect()");? And if that does nothing/fails, are there not calls to find out what happened or test for/display any error?