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/*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* This is an example on how to make a simple VNC client with
* Qt5 Widgets. It suitable for desktop apps, but may not be
* good for mobile.
* It does not implement any form of cryptography,
* authentication support, client-side cursors or framebuffer
* resizing. If you want to make this a part of your
* application, please notice that you may need to change
* the while(true) loop to disconnect the client.
*
* To build this example with all the other components of
* libvncserver, you may need to explicitly define a C++
* compiler and the path to Qt libs when calling CMake.
* e.g. cmake -DCMAKE_PREFIX_PATH=~/Qt/5.15.2/gcc_64
* -DCMAKE_CXX_COMPILER=g++
*/
#include <QApplication>
#include <iostream>
#include <thread>
#include <QPaintEvent>
#include <QPainter>
#include "rfb/rfbclient.h"
#include <QWidget>
class VncViewer : public QWidget
{
//if you want to make use of signals/slots, uncomment the line bellow:
//Q_OBJECT
public:
VncViewer(QWidget *parent = nullptr) {};
virtual ~VncViewer() {};
void start();
std::string serverIp;
int serverPort;
std::thread *vncThread() const;
void paintEvent(QPaintEvent *event) override;
void mouseMoveEvent(QMouseEvent *event) override;
void mousePressEvent(QMouseEvent *event) override;
void mouseReleaseEvent(QMouseEvent *event) override;
void closeEvent(QCloseEvent *event) override;
private:
bool m_startFlag = false;
QImage m_image;
rfbClient *cl;
std::thread *m_vncThread;
static void finishedFramebufferUpdateStatic(rfbClient *cl);
void finishedFramebufferUpdate(rfbClient *cl);
};
void VncViewer::finishedFramebufferUpdateStatic(rfbClient *cl)
{
VncViewer *ptr = static_cast<VncViewer*>(rfbClientGetClientData(cl, nullptr));
ptr->finishedFramebufferUpdate(cl);
}
void VncViewer::finishedFramebufferUpdate(rfbClient *cl)
{
m_image = QImage(cl->frameBuffer, cl->width, cl->height, QImage::Format_RGB16);
update();
}
void VncViewer::paintEvent(QPaintEvent *event)
{
event->accept();
QPainter painter(this);
painter.drawImage(this->rect(), m_image);
}
void VncViewer::mouseMoveEvent(QMouseEvent *event)
{
if (m_startFlag) {
SendPointerEvent(cl,
event->localPos().x() / width() * cl->width,
event->localPos().y() / height() * cl->height,
(event->buttons() & Qt::LeftButton) ? 1 : 0);
}
}
void VncViewer::mousePressEvent(QMouseEvent *event)
{
if (m_startFlag) {
SendPointerEvent(cl,
event->localPos().x() / width() * cl->width,
event->localPos().y() / height() * cl->height,
1);
}
}
void VncViewer::mouseReleaseEvent(QMouseEvent *event)
{
if (m_startFlag) {
SendPointerEvent(cl,
event->localPos().x() / width() * cl->width,
event->localPos().y() / height() * cl->height,
0);
}
}
void VncViewer::closeEvent(QCloseEvent *event)
{
m_startFlag = false;
if (m_vncThread->joinable()) {
m_vncThread->join();
}
QWidget::closeEvent(event);
}
void VncViewer::start()
{
cl = rfbGetClient(8, 3, 4);
cl->format.depth = 24;
cl->format.depth = 16;
cl->format.bitsPerPixel = 16;
cl->format.redShift = 11;
cl->format.greenShift = 5;
cl->format.blueShift = 0;
cl->format.redMax = 0x1f;
cl->format.greenMax = 0x3f;
cl->format.blueMax = 0x1f;
cl->appData.compressLevel = 9;
cl->appData.qualityLevel = 1;
cl->appData.encodingsString = "tight ultra";
cl->FinishedFrameBufferUpdate = finishedFramebufferUpdateStatic;
cl->serverHost = strdup(serverIp.c_str());
cl->serverPort = serverPort;
cl->appData.useRemoteCursor = TRUE;
rfbClientSetClientData(cl, nullptr, this);
if (rfbInitClient(cl, 0, nullptr)) {
} else {
std::cout << "[INFO] disconnected" << std::endl;
return;
}
m_startFlag = true;
std::cout << "[INFO] screen size: " << cl->width << " x " << cl->height << std::endl;
this->resize(cl->width, cl->height);
m_vncThread = new std::thread([this]() {
while (m_startFlag) {
int i = WaitForMessage(cl, 500);
if (i < 0) {
std::cout << "[INFO] disconnected" << std::endl;
rfbClientCleanup(cl);
break;
}
if (i && !HandleRFBServerMessage(cl)) {
std::cout << "[INFO] disconnected" << std::endl;
rfbClientCleanup(cl);
break;
}
};
});
}
int main(int argc, char *argv[])
{
if(argc < 3) {
std::cout << "Usage: "
<< argv[0]
<< " <server ip>"
<< " <port>"
<< "\n";
return 1;
}
QApplication a(argc, argv);
VncViewer vncViewer;
vncViewer.serverIp = std::string{argv[1]};
vncViewer.serverPort = std::atoi(argv[2]);
vncViewer.show();
vncViewer.start();
return a.exec();
}
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