QTimer in QThread ..???

[Franckynos]

Hi,

If I write this :

void StepperMotor::moveR(int step)
{
    qDebug() << this->thread()->currentThread();
    QTimer t;
    t.setInterval(1000);
    int posReach = send(GAP,1,0,0) + step;
    send(MVP, 1, step, 0);
    t.start();
    while (posReach != send(GAP,1,0,0,false) && t.remainingTime()>=0);
    qDebug() << "END "<< QTime::currentTime() << t.remainingTime();
}

Launch by a QtConcurrent, the timer "t.remainingTime() = 0 at once.

And no pause are done so if I wrote several time :
moveR(100);
moveR(-1100);
moveR(150);

These 3 function are done in the same time ~3ms between 2 functions.

I don't know how wait the end of the first moveR to launch the second. (Without hanging GUI)

Someone can help me ?
thx

[Lineaxe]

I think start up a separate thread. Inside it you can emit a signal to the GUI thread which can be picked up by a slot that you create in the GUI thread. This slot can give you lots of feedback information. I emit a signal just for diagnosing code in the thread. It can be inserted anywhere in the thread code. It simply supplies a Qstring to the GUI slot . You can use csv (comma separated values) for a simple way of holding data of different types. You can show them in a Lineedit ,Textedit or even fill up combobox's , and so on.
This way you can test methods ...Also, you might even look into trying something along this pseudo code . Do loops work great in these situations.
Do
{
your code to moveR
{
while ( your condition to test end of moveR)

// you don't have to worry about blocking GUI in separate thread

[mrjj]

https://forum.qt.io/topic/64682/function-step-by-setp/4

[Franckynos]

If i put moveR in thread my timer dosen't work

t.start(5000);
    do{
        qDebug() << t.remainingTime();
    }while (posReach != send(GAP,1,0,0,false) && t.remainingTime()>=0);

Outside thread:
Timer =
1000
1000
1000
999
999
999
999
998
998
998
997

Inside thread :
Timer =
-177908879

and ended the function.

In my condition while :

while (posReach != send(GAP,1,0,0,false) && t.remainingTime()>=0);

I call send function :

int StepperMotor::send(int commande, int param, int value, int motor_bank, bool verbose)
{
    UCHAR Address, Status;
    int	Value, Timeout;
    Address=0;
    Status=0;
    Value=0;
    Timeout=GetTickCount();
    SendCmd(hRS232, 1, commande, param, motor_bank, value);
    while(GetResult(hRS232, &Address, &Status, &Value)==TMCL_RESULT_NOT_READY && abs(GetTickCount()-Timeout)<1000);
    if(Address == 0)
    {
        portIsOpen = false;
        emit errorPort("Envoi impossible");
        if(!closeCOMmanual)
            tryToConnect();
        return -1;
    }
    emit reponse(Value, Status, Address);
    if(verbose)
        qDebug() << QString("[%4] Result: Address=%1, Status=%2, Value=%3\n").arg(Address).arg(Status).arg(Value).arg(GetTickCount()-Timeout);
    return Value;
}


/******/
void StepperMotor::SendCmd(HANDLE Handle, UCHAR Address, UCHAR Command, UCHAR Type, UCHAR Motor, INT Value)
{
    UCHAR TxBuffer[9];
    DWORD BytesWritten;
    int i;

    TxBuffer[0]=Address;
    TxBuffer[1]=Command;
    TxBuffer[2]=Type;
    TxBuffer[3]=Motor;
    TxBuffer[4]=Value >> 24;
    TxBuffer[5]=Value >> 16;
    TxBuffer[6]=Value >> 8;
    TxBuffer[7]=Value & 0xff;
    TxBuffer[8]=0;
    for(i=0; i<8; i++)
        TxBuffer[8]+=TxBuffer[i];

    //Send the datagram
    cptRequest++;
    WriteFile(Handle, TxBuffer, 9, &BytesWritten, NULL);
}

UCHAR StepperMotor::GetResult(HANDLE Handle, UCHAR *Address, UCHAR *Status, int *Value)
{
    UCHAR RxBuffer[9], Checksum;
    DWORD Errors, BytesRead;
    COMSTAT ComStat;
    int i;

    //Check if enough bytes can be read
    ClearCommError(Handle, &Errors, &ComStat);
    if(ComStat.cbInQue>8)
    {
        cptRequest++;
        //Receive
        ReadFile(Handle, RxBuffer, 9, &BytesRead, NULL);

        Checksum=0;
        for(i=0; i<8; i++)
            Checksum+=RxBuffer[i];

        if(Checksum!=RxBuffer[8]) return TMCL_RESULT_CHECKSUM_ERROR;

        *Address=RxBuffer[0];
        *Status=RxBuffer[2];
        *Value=(RxBuffer[4] << 24) | (RxBuffer[5] << 16) | (RxBuffer[6] << 8) | RxBuffer[7];
    } else return TMCL_RESULT_NOT_READY;

    return TMCL_RESULT_OK;
}

[kshegunov]

@Franckynos

If i put moveR in thread my timer dosen't work

Your timer can't work when you block the event loop, since a timer relies on the event loop to dispatch the timer events.