QSettings::beginWriteArray() | Is this output normal and expected ?



  • Hello, folks. Qt newbie here.

    I'm using QSettings in combination with a QTableWidget to save some user configurations. At this point, my code appears to be saving the data from the table, but I'm not clear on why it's saving the data in the manner that it is, and it's very likely the way I have it coded.

    You should be able to see the table here.

    Here is the code I'm using (don't like the way this forum software handles code pasting):

    userConfigs.beginGroup("ComponentAliases");
       rows = ui->tableComponentAliases->rowCount();
       cols = ui->tableComponentAliases->columnCount();
    
       for (int ptrRow = 0; ptrRow <= rows; ptrRow++) {
           userConfigs.beginWriteArray(QString::number(ptrRow));
    
           for (int ptrCol = 0; ptrCol <= cols; ptrCol++) {
    
               if (ui->tableComponentAliases->item(ptrRow, ptrCol)) {
                   userConfigs.setArrayIndex(ptrRow);
                   userConfigs.setValue(QString::number(ptrRow)+QString::number(ptrCol), ui->tableComponentAliases->item(ptrRow, ptrCol)->text());
                   if (debugConfigs) {
                       qDebug() << "BoM: ComponentAliases: row" << ptrRow << "col" << ptrCol << ":"
                       << ui->tableComponentAliases->item(ptrRow, ptrCol)->text();
                   }
               }
    
           }
    
           userConfigs.endArray();
           if (debugConfigs) qDebug() << "---------";
       }
    
       userConfigs.endGroup(); // ComponentAliases
    

    What I'm shooting for is the output to be the table's row#\column#\value.
    Here is the output I'm getting:

    [BomConfiguration]
    ComponentAliases\0\1\00=c
    ComponentAliases\0\1\01=cap
    ComponentAliases\0\1\02=capacitor
    ComponentAliases\0\1\03=c_small
    ComponentAliases\0\size=1
    ComponentAliases\1\2\10=r
    ComponentAliases\1\2\11=res
    ComponentAliases\1\2\12=resistor
    ComponentAliases\1\2\13=r_small
    ComponentAliases\1\size=2
    ComponentAliases\10\size=0
    ComponentAliases\2\3\20=sw
    ComponentAliases\2\3\21=switch
    ComponentAliases\2\size=3
    ComponentAliases\3\4\30=l
    ComponentAliases\3\4\31=inductor
    ComponentAliases\3\4\32=l_small
    ComponentAliases\3\size=4
    ComponentAliases\4\5\40=zener
    ComponentAliases\4\5\41=zenersmall
    ComponentAliases\4\5\42=
    ComponentAliases\4\5\43=
    ComponentAliases\4\size=5
    ComponentAliases\5\6\50=d
    ComponentAliases\5\6\51=diode
    ComponentAliases\5\6\52=d_small
    ComponentAliases\5\size=6
    ComponentAliases\6\size=0
    ComponentAliases\7\size=0
    ComponentAliases\8\size=0
    ComponentAliases\9\size=0
    

    The values appear to be correct, but I'm seeing what appears to be column numbers up to 6 when there's only 4 columns ?

    The numbers just before the "=" sign appear to be the row and column numbers combined. Correct ?

    I don't understand the "size=n" entries. Is this normal when writing arrays with QSettings ?

    I'd greatly appreciate if someone could kindly explain and/or offer suggestions on the code. I'm reluctant to write code to read the data back in unless I can understand if these things are normal.

    Thanks in advance !


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