c++ - QtGui5 not loaded -

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i developing application in c++, winapi , qt. application communicates through serial com ports. user can open multiple pairs of ports , opened port listens other port constantly. implement functionality use windows threads.there method named startread() reads other port , changes text area.

void sendandreceive::startread(){      dword numread = 0;     std::string hex;      while (1)     {         char *buffer = (char *)malloc(sizeof(char) * 500);         bool ret = readfile(porthandler, buffer, 500, &numread, 0);         if (!ret)         {             std::string errormessage = "";         }         buffer[numread] = '\0';         std::string receiveddata(buffer);         qstring qdata(receiveddata.c_str());         if (ui->checkbox->ischecked())         {             std::string receiveddata(buffer);             hex= stringtohex(receiveddata);             qstring qdata1(hex.c_str());             emit ashex(qdata1);         }          qstring qdata2(receiveddata.c_str()) ;         emit finished(qdata2);         free(buffer);     } }

and there thread writes data periodically other port. example , if enter 2 seconds in text line , program writes data other port @ every 2 seconds , method writeperiodic().

void sendandreceive::writeperiodic(){     dword numwritten;     while (1 && checkwrite == true )     {         concurrency::wait(timeperiod*1000);         qstring qdata = ui->textedit->toplaintext();         std::string data = qdata.tostdstring();         writefile(porthandler, data.c_str(), strlen(data.c_str()), &numwritten, null);     } }

so when run program , program runs smoothly 2 or 3 minutes , crashes , errors "program has stopped working" , "program closed unexpectedly".when debug program , says "qt5core not loaded" or "qt5gui not loaded".

before ask here , did search on web . first did not use emit finished(qstring) signal , instead directly manipulated gui objects inside startread() method.(i did ui->text_edit->settext(some qstring)).but after search learn can not change gui objects thread decided use signal , slot mechanism , has not solved problem far.i same error again , again.please tell me doing wrong . if need further explanation, happily give more details.


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