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Thread: Problem with QTableWidgetItem

  1. 7th May 2008, 18:32 #1
    arunvv
    arunvv is offline Intermediate user
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    Default Problem with QTableWidgetItem

    Hi

    I am having a problem with QTableWidgetItem.
    I created a table (2 rows, 11 columns) using QTableWidget.
    I have 2 functions, firstRowUpdate() and secondRowUpdate();

    When I am only using firstRowUpdate() function it works fine and updates the firstRow & its 11 columns.
    But I use secondRowUpdate() along with firstRowUpdate() function it overwrites the firstRowUpdate values in firstRow with secondRowUpdate function values.
    Both rows shows same values.

    Both the functions are similar in coding, except setting items with different values or strings to display, in firstRowUpdate() and secondRowUpdate() functions.

    What could be causing the problem, when i try to update both rows simultaneously.

    Thanks & Regards,
    Arun
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  2. 7th May 2008, 18:46 #2
    arunvv
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    Default Re: Problem with QTableWidgetItem

    Forgot to add a snippet of code:

    Qt Code: 
    1. void MainWindow::createTable()
    2. {
    3.       tableWidget_wmhData->setRowCount(2);
    4. 	tableWidget_wmhData->setColumnCount(11);
    5. 	tableWidget_wmhData->setHorizontalHeaderLabels(QStringList()  << tr("    Vehicle ID         ") << tr("  UTC Time    ")  << tr(" Latitude ") << tr(" Longitude ") << tr(" VehSpd ")  << tr(" Heading ") << tr("X-Accel")  << tr("YawRate") << tr("BrkSts") << tr("Sequence#") << tr("Event"));
    6. 	tableWidget_wmhData->resizeColumnsToContents();
    7. }
    8.  
    9. void MainWindow::firstRowUpdate()
    10. {
    11.     char hostVehID[6], hostUTCTimeStr[20];
    12.     memset(&wmhHVData, 0, sizeof(wmhHVData));
    13.      if(!get_wmh_hv_data( &shmPtr->wmh_data, &wmhHVData, NULL))
    14.      {
    15.           printf("EGUI-WMH: Host Vehicle Data Error\n");
    16.           return;
    17.      }
    18.      else
    19.      {
    20.             sprintf(hostVehID, "%02x:%02x:%02x:%02x:%02x:%02x", wmhHVData.ota.basicMsg.tempId[0], 
    21.             wmhHVData.ota.basicMsg.tempId[1], wmhHVData.ota.basicMsg.tempId[2], wmhHVData.ota.basicMsg.tempId[3],                       wmhHVData.ota.basicMsg.tempId[4], wmhHVData.ota.basicMsg.tempId[5]);
    22.             HostVehIDRow->setText("1");
    23.             printf("HostVehID: %s \n", hostVehID);
    24.  
    25.             Q_hostVehID = (const char *)hostVehID;
    26.             wmhVehID->setText(Q_hostVehID);
    27.             tableWidget_wmhData->setItem(0, 0, wmhVehID);
    28.             epo_ms_to_time_str(hostUTCTimeStr, sizeof(hostUTCTimeStr), v_gettime(NULL));
    29.             Q_wmhUTCTime = (const char *)hostUTCTimeStr;
    30.             wmhUTCTime->setText(Q_wmhUTCTime);
    31.             tableWidget_wmhData->setItem(0, 1, wmhUTCTime);
    32.             wmhLatitude->setText(Q_wmhLatitude.setNum(wmhHVData.ota.basicMsg.latitude, 'f', 6));
    33.             tableWidget_wmhData->setItem(0, 2, wmhLatitude);
    34.             wmhLongitude->setText(Q_wmhLongitude.setNum(wmhHVData.ota.basicMsg.longitude, 'f', 6));
    35.             tableWidget_wmhData->setItem(0, 3, wmhLongitude);
    36.             wmhVehSpd->setText(Q_wmhVehSpd.setNum(wmhHVData.ota.basicMsg.canData.vehSpeed, 'f', 6));
    37.             tableWidget_wmhData->setItem(0, 4, wmhVehSpd);
    38.             wmhHeading->setText(Q_wmhHeading.setNum(wmhHVData.ota.basicMsg.heading, 'f', 6));
    39.             tableWidget_wmhData->setItem(0, 5, wmhHeading);
    40.             wmhXAccel->setText(Q_wmhXAccel.setNum(wmhHVData.ota.basicMsg.canData.latAccel));
    41.             tableWidget_wmhData->setItem(0, 6, wmhXAccel);
    42.             wmhYawRate->setText(Q_wmhYawRate.setNum(wmhHVData.ota.basicMsg.canData.yawRate));
    43.             tableWidget_wmhData->setItem(0, 7, wmhYawRate);
    44.             wmhBrkSts->setText(Q_wmhBrkSts.setNum(wmhHVData.ota.basicMsg.canData.brakeActive));
    45.             tableWidget_wmhData->setItem(0, 8, wmhBrkSts);
    46.             wmhSeqNum->setText(Q_wmhSeqNum.setNum(wmhHVData.ota.msgSequenceNum));
    47.             tableWidget_wmhData->setItem(0, 9, wmhSeqNum);
    48.             wmhEvent->setText(Q_wmhEvent.setNum(wmhHVData.ota.vehicleEvent));
    49.             tableWidget_wmhData->setItem(0, 10, wmhEvent);
    50.      }
    51. }
    52.  
    53. void MainWindow::secondRowUpdate()
    54. {
    55.     char remoteVehID[6], remoteUTCTimeStr[20];
    56.     bool remoteVeh;
    57.     for ( remoteVeh = get_first_wmh_rv_data( &shmPtr->wmh_data, shmPtr->wmh_rv_data, &wmhRVData );
    58.                     (remoteVeh);
    59.                     remoteVeh = get_next_wmh_rv_data( &shmPtr->wmh_data, shmPtr->wmh_rv_data, &wmhRVData, &wmhRVData ))
    60.               {
    61.                     sprintf(remoteVehID, "%02x:%02x:%02x:%02x:%02x:%02x", wmhRVData.ota.basicMsg.tempId[0],
    62.                     wmhRVData.ota.basicMsg.tempId[1], wmhRVData.ota.basicMsg.tempId[2],
    63.                     wmhRVData.ota.basicMsg.tempId[3], wmhRVData.ota.basicMsg.tempId[4], 
    64.                     wmhRVData.ota.basicMsg.tempId[5]);    
    65.                     printf("remoteVeh Boolean Value: %d, RemoteVehID: %s\n", remoteVeh, remoteVehID);
    66.                     Q_remoteVehID = (const char *)remoteVehID;
    67.                     qDebug() << "Qt Has RemoteID as: " << Q_remoteVehID << endl;
    68.                     wmhVehID->setText(Q_remoteVehID);
    69.                     tableWidget_wmhData->setItem(1, 0 , wmhVehID);
    70.                     epo_ms_to_time_str(remoteUTCTimeStr, sizeof(remoteUTCTimeStr), v_gettime(NULL));
    71.                     Q_wmhUTCTime = (const char *)remoteUTCTimeStr;
    72.                     wmhUTCTime->setText(Q_wmhUTCTime);
    73.                     tableWidget_wmhData->setItem(1, 1, wmhUTCTime);
    74.                     wmhLatitude->setText(Q_wmhLatitude.setNum(wmhRVData.ota.basicMsg.latitude, 'f', 6));
    75.                     tableWidget_wmhData->setItem(1, 2, wmhLatitude);
    76.                     wmhLongitude->setText(Q_wmhLongitude.setNum(wmhRVData.ota.basicMsg.longitude, 'f', 6));
    77.                     tableWidget_wmhData->setItem(1, 3, wmhLongitude);
    78. 	                wmhVehSpd->setText(Q_wmhVehSpd.setNum(wmhRVData.ota.basicMsg.canData.vehSpeed, 'f', 6));
    79. 	                tableWidget_wmhData->setItem(1, 4, wmhVehSpd);
    80. 	                wmhHeading->setText(Q_wmhHeading.setNum(wmhRVData.ota.basicMsg.heading, 'f', 6));
    81. 	                tableWidget_wmhData->setItem(1, 5, wmhHeading);
    82. 	                wmhXAccel->setText(Q_wmhXAccel.setNum(wmhRVData.ota.basicMsg.canData.latAccel));
    83. 	                tableWidget_wmhData->setItem(1, 6, wmhXAccel);
    84. 	                wmhYawRate->setText(Q_wmhYawRate.setNum(wmhRVData.ota.basicMsg.canData.yawRate));
    85. 	                tableWidget_wmhData->setItem(1, 7, wmhYawRate);
    86. 	                wmhBrkSts->setText(Q_wmhBrkSts.setNum(wmhRVData.ota.basicMsg.canData.brakeActive));
    87. 	                tableWidget_wmhData->setItem(1, 8, wmhBrkSts);
    88. 	                wmhSeqNum->setText(Q_wmhSeqNum.setNum(wmhRVData.ota.msgSequenceNum));
    89. 	                tableWidget_wmhData->setItem(1, 9, wmhSeqNum);
    90. 	                wmhEvent->setText(Q_wmhEvent.setNum(wmhRVData.ota.vehicleEvent));
    91. 	                tableWidget_wmhData->setItem(1, 10, wmhEvent);
    92.               }       
    93. }
    94.  
    95. /* Starts Timer  twice a second*/
    96. void MainWindow::startEGUIDataTimer()
    97. {
    98. 	eguiDisplayTimer = new QTimer();
    99. 	connect(eguiDisplayTimer, SIGNAL(timeout()), this, SLOT(printData()));
    100. 	eguiDisplayTimer->start(500);
    101. }
    102.  
    103. void MainWindow::printData()
    104. {
    105.     fisrtRowUpdate();
    106.     memset(&wmhRVData, 0, sizeof(wmhRVData));
    107.  
    108.     remoteVehCount = get_wmh_rv_num(&shmPtr->wmh_data); //Collecting Remote Vehicles Count
    109.     printf("Remote Veh Count: %d\n", remoteVehCount);
    110.  
    111.     if(remoteVehCount > 0)
    112.     {
    113.         secondRowUpdate();
    114.     }
    115. }
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    This is what I am doing, what i am doing wrong, when i use secondRowUpdate() it displays same in both rows, if I use only firstRowUpdate() it works fine.

    Thanks & Regards,
    Arun
    Last edited by jpn; 12th May 2008 at 14:14. Reason: missing [code] tags
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  3. 9th May 2008, 00:04 #3
    arunvv
    arunvv is offline Intermediate user
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    Default Re: Problem with QTableWidgetItem

    I found out what the problem is,

    The problem is with usage of same QWidgetTableItems for both the rows.

    Now if I change with different QWidgetTableItems I am getting correct values, in each row.

    But I have one more problem, i have one more table which has 20rows and 10 columns.
    For 20rows and 10 columns , i need to create 200 QTableWidgetItems with different variables.
    How can i create 200 QTableWidgetItems, in a simpler or best way.

    Thanks & Regards,
    Arun
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