QT 和OpenCV 的多线程框架 vs2008版本

/************************************************************************/ /* qt-opencv-multithreaded: */ /* A multithreaded OpenCV application using the Qt framework. */ /* */ /* MainWindow.cpp */ /* */ /* Nick D'Ademo <nickdademo@gmail.com> */ /* */ /* Copyright (c) 2011 Nick D'Ademo */ /* */ /* Permission is hereby granted, free of charge, to any person */ /* obtaining a copy of this software and associated documentation */ /* files (the "Software"), to deal in the Software without restriction, */ /* including without limitation the rights to use, copy, modify, merge, */ /* publish, distribute, sublicense, and/or sell copies of the Software, */ /* and to permit persons to whom the Software is furnished to do so, */ /* subject to the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */ /* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS */ /* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN */ /* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN */ /* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */ /* SOFTWARE. */ /* */ /************************************************************************/ #include "CameraConnectDialog.h" #include "ProcessingSettingsDialog.h" #include "Controller.h" #include "MainWindow.h" // Qt header files #include <QDebug> // Configuration header file #include "Config.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { // Setup user interface setupUi(this); // Create controller controller = new Controller; // Save application version in QString variable appVersion=QUOTE(APP_VERSION); // Create processingSettingsDialog processingSettingsDialog = new ProcessingSettingsDialog(this); // Initialize data structures initializeProcessingFlagsStructure(); initializeTaskDataStructure(); // Enable/disable appropriate GUI items setInitGUIState(); // Initialize GUI initializeGUI(); // Connect signals to slots signalSlotsInit(); // Initialize flag isCameraConnected=false; } // MainWindow constructor MainWindow::~MainWindow() { // Check if camera is connected if(isCameraConnected) { // Disconnect connections (4) disconnect(controller->processingThread,SIGNAL(newFrame(QImage)),0,0); disconnect(this,SIGNAL(newProcessingFlags(struct ProcessingFlags)),controller->processingThread,SLOT(updateProcessingFlags(struct ProcessingFlags))); disconnect(this->processingSettingsDialog,SIGNAL(newProcessingSettings(struct ProcessingSettings)),controller->processingThread,SLOT(updateProcessingSettings(struct ProcessingSettings))); disconnect(this,SIGNAL(newTaskData(struct TaskData)),controller->processingThread,SLOT(updateTaskData(struct TaskData))); // Stop processing thread if(controller->processingThread->isRunning()) controller->stopProcessingThread(); // Stop capture thread if(controller->captureThread->isRunning()) controller->stopCaptureThread(); // Clear image buffer controller->clearImageBuffer(); // Check if threads have stopped if((controller->captureThread->isFinished())&&(controller->processingThread->isFinished())) { // Disconnect camera controller->disconnectCamera(); // Delete threads controller->deleteCaptureThread(); controller->deleteProcessingThread(); // Delete image buffer controller->deleteImageBuffer(); } } } // MainWindow destructor void MainWindow::connectToCamera() { // Create dialog cameraConnectDialog = new CameraConnectDialog(this); // PROMPT USER: // If user presses OK button on dialog, connect to camera; else do nothing if(cameraConnectDialog->exec()==1) { // Set private member variables in cameraConnectDialog to values in dialog cameraConnectDialog->setDeviceNumber(); cameraConnectDialog->setImageBufferSize(); // Store image buffer size in local variable imageBufferSize=cameraConnectDialog->getImageBufferSize(); // Store device number in local variable deviceNumber=cameraConnectDialog->getDeviceNumber(); // Connect to camera if((isCameraConnected=controller->connectToCamera(deviceNumber,imageBufferSize))) { // Create connection between processing thread (emitter) and GUI thread (receiver/listener) connect(controller->processingThread,SIGNAL(newFrame(QImage)),this,SLOT(updateFrame(QImage)),Qt::UniqueConnection); // Create connections (3) between GUI thread (emitter) and processing thread (receiver/listener) qRegisterMetaType<struct ProcessingFlags>("ProcessingFlags"); connect(this,SIGNAL(newProcessingFlags(struct ProcessingFlags)),controller->processingThread,SLOT(updateProcessingFlags(struct ProcessingFlags)),Qt::UniqueConnection); qRegisterMetaType<struct ProcessingSettings>("ProcessingSettings"); connect(this->processingSettingsDialog,SIGNAL(newProcessingSettings(struct ProcessingSettings)),controller->processingThread,SLOT(updateProcessingSettings(struct ProcessingSettings)),Qt::UniqueConnection); qRegisterMetaType<struct TaskData>("TaskData"); connect(this,SIGNAL(newTaskData(struct TaskData)),controller->processingThread,SLOT(updateTaskData(struct TaskData)),Qt::UniqueConnection); // Set data to defaults in processingThread emit newProcessingFlags(processingFlags); emit newTaskData(taskData); processingSettingsDialog->resetAllDialogToDefaults(); processingSettingsDialog->updateStoredSettingsFromDialog(); // Setup imageBufferBar in main window with minimum and maximum values imageBufferBar->setMinimum(0); imageBufferBar->setMaximum(imageBufferSize); // Enable/disable appropriate menu items connectToCameraAction->setDisabled(true); disconnectCameraAction->setDisabled(false); processingMenu->setDisabled(false); // Enable "Clear Image Buffer" push button in main window clearImageBufferButton->setDisabled(false); // Get input stream properties sourceWidth=controller->captureThread->getInputSourceWidth(); sourceHeight=controller->captureThread->getInputSourceHeight(); // Set text in labels in main window deviceNumberLabel->setNum(deviceNumber); cameraResolutionLabel->setText(QString::number(sourceWidth)+QString("x")+QString::number(sourceHeight)); /* QThread::IdlePriority 0 scheduled only when no other threads are running