c++ - QThread creation and exchanging data over slots -


this thread header file:

#include <qthread> #include <qstring> #include "typedef.h"  class imgprocess : public qthread {     q_object public:     explicit imgprocess(qobject *parent = 0);     void run();      bool stop;     imageinfo iinf;  signals:     void valuechanged(int);     void newfile(qstring filename, mycustomstruct* metadata);  public slots:  private slots:  }; q_declare_metatype(mycustomstruct);

and code use create 10 threads class (above header file imgprocess.h)

void createthreads() {     qregistermetatype<mycustomstruct>("mycustomstruct");     qlist<qthread*> threadlist;     (int =0;i<10;i++)     {         qthread* thread = new qthread;         imgprocess *prcthread = new imgprocess(this);         prcthread->movetothread(thread);         connect(prcthread, signal(valuechanged(int)),this, slot(onvaluechanged(int)));         connect(prcthread, signal(newfile(qstring,mycustomstruct*)),this, slot(newfile(qstring,mycustomstruct*)));         prcthread->start();         threadlist.push_back(thread);     } }

the valuchanged signal/slot works well, i'm able send integer threads thread creator class, tried qstring , able send qstring thread creator.

now want exchange mycustomstruct have several int, qstring, char, doubles, struct embedded, etc. doesn't work, tried q_declare_metatype, no luck. missing?

in main thread when try read metadata->datetime(); access denied error.

you should call qregistermetatype() make custom types available non-template based functions, such queued signal , slot connections. class or struct has public default constructor, public copy constructor, , public destructor can registered.

you should call example in creaththreads() function:

qregistermetatype<mycustomstruct>("mycustomstruct");

also should declare mycustomstruct class , prepare public default constructor, public copy constructor, , public destructor it.


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