QT and SerialPort

[hgedek]

We have a project.We will connect two computers with serialports using cable.Wrote the codes in console but now we will use QT for GUI.
When the ReadFile( ...) codes began to work the program crash.Everything stop and abort.How can we solve this?Why QT cause so problem???

[hgedek]

Project has 3 module.GUI-communication-serialport
GUI
s.listeningPort(); //s is a communication object

communication
srlObj.readMsgFromPort(); //srlobj is a serialport object

serialport-readmMsgFromPort

int size1, size2;

vector<string>msgV;
vector<string>msg;
msg.push_back("-9999");

int i=0;
char buffer[200]={0};

#ifdef WIN32
DWORD Read;
#else
int Read;
#endif


#ifdef WIN32
if (!ReadFile(hComm,&size1,sizeof(int), &Read, NULL)) //Error1
return msg;
#else
Read=read(fd,&size1,sizeof(int));

#endif


while(i<size1)
{
#ifdef WIN32
if (!ReadFile(hComm,&size2,sizeof(int), &Read, NULL)) //Error2
return msg;


if (!ReadFile(hComm,buffer,size2, &Read, NULL))
return msg;
#else
Read=read(fd,&size2,sizeof(int));
Read=read(fd,buffer,size2);

#endif
buffer[size2]=0;
msgV.push_back(buffer);

i++;

}


return msgV;


}

When Readfiles function work, program stops.But in console application everything ok.

[hgedek]

No answer???

[hgedek]

No answer???

Hello.I found something.In Console ,ReadFile wait for a signal from port.If there is nothing,it wait.But in other no.It passes directly.Not wait for something.Why....