I'm trying to use QtConcurrent::map to concurrently run a image conversion on each of the selected files that the user inputs to my app. For this I have a class that gets all the info about where the file will be stored and other stuff, and I have two methods for the conversion:

void ConvertThread::convert()
void ConvertThread::convertFileToPdf(const QString& file)

In the convert method, I set a QFuture<void> f = QtConcurrent::map(fileList, &ConvertThread::convertFileToPdf), where fileList is a QList<String>

I've been using code from Qt examples on how to do this and I think I got it right, but for some reason when I try to compile I'm getting this error:

/Library/Frameworks/QtCore.framework/Headers/qtconcurrentmapkernel.h: In member function 'bool QtConcurrent::MapKernel<Iterator, MapFunctor>::runIteration(Iterator, int, void*) [with Iterator = QList<QString>::iterator, MapFunctor = void (ConvertThread::*)(const QString&)]':
convertthread.cpp:39: instantiated from here
/Library/Frameworks/QtCore.framework/Headers/qtconcurrentmapkernel.h:73: error: must use '.*' or '->*' to call pointer-to-member function in '((QtConcurrent::MapKernel<QList<QString>::iterato r, void (ConvertThread::*)(const QString&)>*)this)->QtConcurrent::MapKernel<QList<QString>::iterato r, void (ConvertThread::*)(const QString&)>::map (...)'
make[1]: *** [debug/convertthread.o] Error 1

If anyone has experience with using QtConcurrent this way, I'd really appreciate some help here.

ps: I know some of the other code isn't connected yet

convertthread.cpp:
Qt Code: 
  1. #include "convertthread.h"
  2. #include <Magick++.h>
  3.  
  4. using namespace Magick;
  5.  
  6. void ConvertThread::enqueueFile(const QString& path) {
  7.     fileList << path;
  8. }
  9.  
  10. void ConvertThread::convert()   {
  11.     QFuture<void> f = QtConcurrent::map(fileList, &ConvertThread::convertFileToPdf);
  12.     converter->setFuture(f);
  13. }
  14.  
  15. void ConvertThread::sendFinishedSignal()    {
  16.     emit imageStatus();
  17. }
  18.  
  19. void ConvertThread::setOutputDir(const QString& folder)    {
  20.     destFolder = folder;
  21. }
  22.  
  23. void ConvertThread::convertFileToPdf(const QString& file)  {
  24.     QString outPath;
  25.     QFileInfo *info = new QFileInfo(file);
  26.     QString fileName = info->baseName();
  27.     outPath = destFolder + QDir::separator() + fileName + ".pdf";
  28.     delete info;
  29.  
  30.     Image *image = new Image();
  31.     try {
  32.         image->read(qPrintable(file));
  33.         image->magick("PDF");
  34.         image->write(qPrintable(outPath));
  35.     }
  36.     catch(Exception &error_)    {
  37.         return;
  38.     }
  39.     delete image;
  40. }
To copy to clipboard, switch view to plain text mode 

convertthread.h:
Qt Code: 
  1. #ifndef CONVERTTHREAD_H
  2. #define CONVERTTHREAD_H
  3.  
  4. #include <QObject>
  5. #include <QtGui>
  6. #include <QFuture>
  7. #include <QFutureWatcher>
  8.  
  9. class ConvertThread : public QObject
  10. {
  11.     Q_OBJECT
  12. public:
  13.     ConvertThread() {
  14.         converter = new QFutureWatcher<void>(this);
  15.         connect(converter, SIGNAL(resultReadyAt(int)), SLOT(sendFinishedSignal()));
  16.     }
  17.     ~ConvertThread()    {
  18.         converter->cancel();
  19.         converter->waitForFinished();
  20.     }
  21.     void convert();
  22.     void enqueueFile(const QString& path);
  23.     void setOutputDir(const QString& folder);
  24.     void convertFileToPdf(const QString& file);
  25.  
  26. private:
  27.     QFutureWatcher<void> *converter;
  28.     QList<QString>        fileList;
  29.     QString               destFolder;
  30.  
  31. signals:
  32.     void imageStatus();
  33.  
  34. public slots:
  35.     void sendFinishedSignal();
  36. };
  37.  
  38. #endif // CONVERTTHREAD_H
To copy to clipboard, switch view to plain text mode