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examples,build: add Qt client example
* CMake: Adds C++ as project language * CMake: Adds WITH_QT option to build Qt client example * Examples: Adds qt5client.cpp * CMake: adds specific way of building Qt client example * CMake: try to find Qt if needed * CMake: makes Qt not required, quiet if not found * CMake: removes CXX as language * CMake: checks if we have C++ compiler before setting standard * CMake: checks C++ compiler before setting project languages I could not find a better solution. It seems like the languages must be set before almost everything. * CMake: check if C++ compiler defined instead of string comparison * CMake: appends CXX to languages, in a better syntax As suggested by dantti * Examples: changes to static_cast in Qt5 client example As suggested by @dantti * Examples: adds description to Qt example * Examples: Qt example can't handle new fb size * Examples: adds additional condition to build Qt example This is need to remove the following message: 'CMake Error: Cannot determine link language for target' * CMake: adds comment about C++ example (Qt client) * Examples: adds CMake remarks to Qt client example * CMake: changes Qt5::Widgets to Qt5Widgets_LIBRARIES Just for standardization
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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++ | ||
| */ | ||
|
|
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| #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; | ||
|
|
||
| private: | ||
| QImage m_image; | ||
| rfbClient *cl; | ||
| std::thread *m_vncThread; | ||
| static void finishedFramebufferUpdateStatic(rfbClient *cl); | ||
| void finishedFramebufferUpdate(rfbClient *cl); | ||
| }; | ||
|
|
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| void VncViewer::finishedFramebufferUpdateStatic(rfbClient *cl) | ||
| { | ||
| VncViewer *ptr = static_cast<VncViewer*>(rfbClientGetClientData(cl, nullptr)); | ||
| ptr->finishedFramebufferUpdate(cl); | ||
| } | ||
|
|
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| 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(); | ||
|
|
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| QPainter painter(this); | ||
| painter.drawImage(this->rect(), m_image); | ||
| } | ||
|
|
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| 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; | ||
|
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| rfbClientSetClientData(cl, nullptr, this); | ||
|
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| if (rfbInitClient(cl, 0, nullptr)) { | ||
| } else { | ||
| std::cout << "[INFO] disconnected" << std::endl; | ||
| return; | ||
| } | ||
|
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| m_vncThread = new std::thread([this]() { | ||
| while (true) { | ||
| int i = WaitForMessage(cl, 500); | ||
| if (i < 0) { | ||
| std::cout << "[INFO] disconnected" << std::endl; | ||
| rfbClientCleanup(cl); | ||
| break; | ||
| } | ||
|
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| if (i && !HandleRFBServerMessage(cl)) { | ||
| std::cout << "[INFO] disconnected" << std::endl; | ||
| rfbClientCleanup(cl); | ||
| break; | ||
| } | ||
| }; | ||
| }); | ||
| } | ||
|
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| int main(int argc, char *argv[]) | ||
| { | ||
| if(argc < 3) { | ||
| std::cout << "Usage: " | ||
| << argv[0] | ||
| << " <server ip>" | ||
| << " <port>" | ||
| << "\n"; | ||
| return 1; | ||
| } | ||
|
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| 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(); | ||
| } |