QLCDNumber strange behavior!

[saman_artorious]

Well, the value of QLcdNumber is set using the display() property. For the first time dealing with QLcdNumber shows a strange behavior.
Consider this example:

void MainWindow::dataFromUdp(QByteArray pack)
{
    if(pack.at(0) == '!')
    {
        unsigned long x;
 
        x = (unsigned char)pack[pack.length() -1] +
                (unsigned char)pack[pack.length() -2] * 256 +
                (unsigned char)pack[pack.length() -3] * 256 * 256 +
                (unsigned char)pack[pack.length() -4] * 256 * 256 * 256;
 
        //extract packet
 
        if(x == crcCalculate(0, pack.length() - 4, pack))  
        {
            //CRC is correct
 
            if(pack[1] == 0x0d)
            {
                number = 0;   // class member variable
                char value[6];
                sprintf(value,"%c%c%c%c%c", (char)pack[2],(char)pack[3],(char)pack[4],
                        (char)pack[5],(char)pack[6]);  
 
//Now value = 00125
 
                number = atoi(value)/1000.0;
 
//Now value is 0.125
 
                ui->lcd_range->display(number);
 
                qDebug() << number;
 
//Here number and qlcd are set to -3.6xx

void MainWindow::dataFromUdp(QByteArray pack)
{
    if(pack.at(0) == '!')
    {
        unsigned long x;

        x = (unsigned char)pack[pack.length() -1] +
                (unsigned char)pack[pack.length() -2] * 256 +
                (unsigned char)pack[pack.length() -3] * 256 * 256 +
                (unsigned char)pack[pack.length() -4] * 256 * 256 * 256;

        //extract packet

        if(x == crcCalculate(0, pack.length() - 4, pack))  
        {
            //CRC is correct

            if(pack[1] == 0x0d)
            {
                number = 0;   // class member variable
                char value[6];
                sprintf(value,"%c%c%c%c%c", (char)pack[2],(char)pack[3],(char)pack[4],
                        (char)pack[5],(char)pack[6]);  

//Now value = 00125

                number = atoi(value)/1000.0;

//Now value is 0.125

                ui->lcd_range->display(number);

                qDebug() << number;

//Here number and qlcd are set to -3.6xx

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it's strange!

[saman_artorious]

Well, the value of QLcdNumber is set using the display() property. For the first time dealing with QLcdNumber shows a strange behavior.
Consider this example:

void MainWindow::dataFromUdp(QByteArray pack)
{
    if(pack.at(0) == '!')
    {
        unsigned long x;
 
        x = (unsigned char)pack[pack.length() -1] +
                (unsigned char)pack[pack.length() -2] * 256 +
                (unsigned char)pack[pack.length() -3] * 256 * 256 +
                (unsigned char)pack[pack.length() -4] * 256 * 256 * 256;
 
        //extract packet
 
        if(x == crcCalculate(0, pack.length() - 4, pack))  
        {
            //CRC is correct
 
            if(pack[1] == 0x0d)
            {
                number = 0;   // class member variable
                char value[6];
                sprintf(value,"%c%c%c%c%c", (char)pack[2],(char)pack[3],(char)pack[4],
                        (char)pack[5],(char)pack[6]);  
 
//Now value = 00125
 
                number = atoi(value)/1000.0;
 
//Now value is 0.125
 
                ui->lcd_range->display(number);
 
                qDebug() << number;
 
//Here number and qlcd are set to -3.6xx

void MainWindow::dataFromUdp(QByteArray pack)
{
    if(pack.at(0) == '!')
    {
        unsigned long x;

        x = (unsigned char)pack[pack.length() -1] +
                (unsigned char)pack[pack.length() -2] * 256 +
                (unsigned char)pack[pack.length() -3] * 256 * 256 +
                (unsigned char)pack[pack.length() -4] * 256 * 256 * 256;

        //extract packet

        if(x == crcCalculate(0, pack.length() - 4, pack))  
        {
            //CRC is correct

            if(pack[1] == 0x0d)
            {
                number = 0;   // class member variable
                char value[6];
                sprintf(value,"%c%c%c%c%c", (char)pack[2],(char)pack[3],(char)pack[4],
                        (char)pack[5],(char)pack[6]);  

//Now value = 00125

                number = atoi(value)/1000.0;

//Now value is 0.125

                ui->lcd_range->display(number);

                qDebug() << number;

//Here number and qlcd are set to -3.6xx

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it's strange!

Found the bug, the server was unwillingly sending a second packet right after the first one. So, the second one overwrote the first without eye noticing it.

Cheers,