from c++ QVector<QVector<QString>> to QML JS array

[shokarta]

hello all,

i have created invokable QVector<QVector<QString>> in C++, which returns this array:

    // 2D array declaration logic
    QVector<QVector<QString>> CreateTableau(int sizeX, int sizeY) {
       QVector<QVector<QString>> result;
       for (int idx1 = 0; idx1 < sizeX; idx1++) {
          result.append(QVector<QString>());
          for (int idx2 = 0; idx2 < sizeY; idx2++) {
             result[idx1].append(QString());
          }
       }
       return result;
    }


QVector<QVector<QString>> PUB::tablePopulate()
{
    QVector<QVector<QString>> result;

	for (i=0; i<tabLen; i++) {

        // declare colLen = amount of Columns
		int colLen = 20;
        if (i==0) { result = CreateTableau(tabLen, colLen); }       //by first row we find out how many columns are there, and will declare 2D array accordingly

        // loop throught columns
        for (int j = 0; j < colLen; j++) {
            result[i][j] = "something";
        }

	}

        qDebug() << "finished!";
	return result;
}

so the question is how do i load it as JS array in QML?
I tried:

    Component.onCompleted: {
        let table = [];
        table = pub.tablePopulate("5506", "6104");      // this properly debugs "finished!" from c++, but hod do i convert it into js array "table"?
        console.log(table.length);                      // TypeError: Cannot read property 'length' of undefined
    }

[SGaist]

Hi,

Well, one issue from the code you posted is that your method has no parameter while your QML call passes two.

[JonB]

@SGaist
Yes, but it outputs qDebug() << "finished!"; at the end so one assumes it is executing.

C++ function returns QVector<QVector<QString>>. Code says return result in table is undefined. Do you have to do some meta-registration thingie to pass types between C++/Qt and QML/JS?

[shokarta]

ugh... you guys are right... i was thinking very wrong way of the method...

basicaly it looks this way:

    // 2D array declaration logic
    QVector<QVector<QString>> CreateTableau(int sizeX, int sizeY) {
		.... code in initial post
       return result;
    }


	
void SAP::materials(QString lageort, QString werk)
{
		... not important code
        table_Quantities(tableHandle);
}


QVector<QVector<QString>> SAP::table_Quantities(RFC_TABLE_HANDLE returnTable)
{
	for (i=0; i<tabLen; i++) {
        int colLen = 10;
        if (i==0) { result = CreateTableau(tabLen, colLen); }       //by first row we find out how many columns are there, and will declare 2D array accordingly

        // loop throught columns
        for (int j = 0; j < colLen; j++) {
            result[i][j] = something;
            //qDebug() << result[i][j];		// works fine
        }
	}
	return result;
}

and when calling it from QML:

    Component.onCompleted: {
        let table = [];
        table = sap.tablePopulate("5506", "6104");
        console.log(table.length);                      // TypeError: Cannot read property 'length' of undefined
    }

then it obviously is undefined when im calling sub method which creates no data unless its called from materials() :D
so I need the SAP::materials() declare also as QVector<QVector<QString>>

so now it works as expected...

Thank you guys