[SOLVED] Write Dll's for Heavy work

antonio

Hi,

I know how to create a dll. I want to write a dll that runs a process and it doesnt block the main application. I tried with QThreadPool and QRunnable, but it crashes. Something like:

@
#include "MyDll.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyDll dll;
dll.heavyProcess();
dll.heavyProcess();
dll.heavyProcess();
dll.heavyProcess();

return app.exec();
}
@

Any idea will be appreciated.

Thanks

SGaist

Hi,

What about QtConcurent ?

Also, it would be better to fix the crash

antonio

Thanks...

I've resolved like this:

myDll.h

@#ifndef myDll_h
#define myDll_h

#include <QObject>
#include "myDllGlobal.h"

class QThreadPool;

class myDll_EXPORT myDll : public QObject
{
Q_OBJECT

public:
HttpLoggerDll(QObject *parent = 0);
void heavyWork();

private:
static QThreadPool *threadPool;
};
#endif
@

myDll.cpp

@
#include "myDll.h"
#include "MyThread.h"
#include <QThreadPool>

QThreadPool *myDll::threadPool = 0;

myDll::myDll(QObject *parent) : QObject(parent)
{
threadPool = QThreadPool::globalInstance();
}

void myDll::heavyWork(){
MyThread *thread = new MyThread();
threadPool->start(thread);
}
@

MyThread.h

@
#ifndef MyThread_h
#define MyThread_h

#include <QRunnable>
#include <QObject>

class MyThread :public QObject, public QRunnable{

Q_OBJECT

public:
MyThread(QObject *parent = 0);
~MyThread();

void run();

};
#endif
@

MyThread.cpp

@#include "MyThread.h"

MyThread::MyThread(QObject *parent) : QObject(parent) {}

MyThread::~MyThread(){}

void MyThread::run(){
// heavy work
}
@

SGaist

So you have it fixed ?

antonio

Yes. it works. Thanks

SGaist

What did you do to make it work ?

antonio

Declaring my variable threadPool as static was the key

SGaist

Sounds rather like a workaround. Anyway, you shouldn't need to have that variable. You should rather use the "global instance":http://qt-project.org/doc/qt-5/qthreadpool.html#details