[SOLVED] error LNK2019 with QAxObject and QAxBase

  • Hello! I try to make some "read-from-excel-write-to-DB" module.
    I don't understand why I got such errors

    @ error LNK2019: unresolved external symbol "public: __thiscall QAxObject::QAxObject(class QString const &,class QObject *)" (??0QAxObject@@QAE@ABVQString@@PAVQObject@@@Z) referenced in function "public: bool __thiscall importdb_module::initExcel(class QAxObject * &)" (?initExcel@importdb_module@@QAE_NAAPAVQAxObject@@@Z)@

    Could you help me to fix it please?
    Well, thats how all thing there looks at this moment

    @#ifndef IMPORTDB_MODULE_H

    #include <QtGui/QMainWindow>
    #include <QAxObject>
    #include "ui_importdb_module.h"

    class importdb_module : public QMainWindow

    importdb_module(QWidget *parent = 0, Qt::WFlags flags = 0);

    void testExlOp(QString &path);

    Ui::importdb_moduleClass ui;

    bool initExcel(QAxObject* &excelApp); //for initialization
    bool readExcelFile(QAxObject* excel, QString& file_path, QString& selected_list); //for read what we need to
    void getTableHeaders(QAxObject* _worksheet, QAxObject* _excel); //get colunm headres

    public slots:
    void on_getExcelPath_clicked();


    #endif // IMPORTDB_MODULE_H@

    @#include <QtGui>
    #include "importdb_module.h"

    importdb_module::importdb_module(QWidget *parent, Qt::WFlags flags)
    : QMainWindow(parent, flags)



    //for initialization
    bool importdb_module::initExcel(QAxObject* &excelApp){
    bool initialized;
    //try to set pointer to excel
    excelApp = new QAxObject("Excel.Application");
    if (excelApp){
    initialized = true;

    QMessageBox::information(0, "", "Excel/Office not installed");
    initialized = false; //if we can't use excel

    //catch if it already opened
    //idk how
    return initialized;

    //for read what we need to
    bool importdb_module::readExcelFile(QAxObject* excel, QString& file_path, QString& selected_list){
    bool read_done;

    //if initialization succesuful we gonna read some stuff from file

    //sort of init
    //get pointer to booklist then open file
    QAxObject* workbooks = excel->querySubObject("WorkBooks");
    workbooks->dynamicCall("Open (const QString&)", file_path);
    //get pointer to woorkbook in active excel
    QAxObject* workbook = excel->querySubObject("ActiveWorkBook");
    //represents all the worksheets in the specified workbook
    QAxObject* worksheets = workbook->querySubObject("WorkSheets");
    //select sheet by name
    QAxObject* worksheet_selected = workbook->querySubObject("Worksheets(int)", 1);//( "WorkSheets(const QVariant&)", selected_list);
    //sort of init

    //read headers only
    getTableHeaders(worksheet_selected, excel);
    read_done = true;

    //cleaning the mess

    worksheet_selected->clear(); //delete elements in such order!
    delete worksheet_selected;
    worksheet_selected = NULL;

    delete workbook;
    workbook = NULL;

    workbooks->dynamicCall( "Close" );
    delete workbooks;
    workbooks = NULL;
    else //if excel not init'zed
    QMessageBox::information(0, "", "Fail");
    read_done = false;

    return read_done;


    void importdb_module::testExlOp(QString &_path){
    QAxObject* excel;

    QString path = _path;//gonna use GUI choose
    QString list = QString("list1");

    if (readExcelFile(excel, path, list)){
    //error output

    delete excel;

    void getTableHeaders(QAxObject* _worksheet, QAxObject* _excel){
    QStringList headers_list;

    QAxObject* usedrange = _worksheet->querySubObject("UsedRange"); //select fulled range
    //getting rows, cols of that range
    QAxObject* rows = usedrange->querySubObject("Rows");
    QAxObject* columns = usedrange->querySubObject("Columns");
    int intRowStart = usedrange->property("Row").toInt();
    int intColStart = usedrange->property("Column").toInt();
    int intCols = columns->property("Count").toInt();
    //string below not necessary right now
    //int intRows = rows->property("Count").toInt();

    //thats how we get to table cells
    QAxObject* cell;
    QVariant cellValue;

    for (int j = intColStart; j < intColStart + intCols; j++)//(int i = intRowStart; i < intRowStart + intRows; i++)
    //in this case we get only column headers
    cell = _excel->querySubObject("Cells(Int, Int)", intRowStart, j);
    cellValue = cell->dynamicCall("value");
    //output in debug console
    for (int i = 0; i < headers_list.size(); ++i){

    delete rows;
    delete columns;
    delete cell;
    //button 'Import' pressed (o. name getExcelPath)
    void importdb_module::on_getExcelPath_clicked(){

    QString path;
    //file browse window
    path = QFileDialog::getOpenFileName(
    "Choose a file to open",


    @#include "importdb_module.h"
    #include <QtGui/QApplication>
    #include <QApplication>
    #include <QtGui>
    #include <QtSql>
    #include <QAxWidget>

    int main(int argc, char *argv[])
    QApplication a(argc, argv);
    importdb_module w;
    return a.exec();

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Did you add

    @CONFIG += qaxcontainer@

    to your pro file ?

  • [quote author="SGaist" date="1382471432"]Hi and welcome to devnet,

    Did you add

    @CONFIG += qaxcontainer@

    to your pro file ?[/quote]

    Hello! I use VS 2008, so, there in linker->input->additional dependencies I added this

    It kinda helped! There were 4 errors befr, but after rebuild now only one left:

    @error LNK2019: unresolved external symbol "private: void __thiscall importdb_module::getTableHeaders(class QAxObject *,class QAxObject *)" (?getTableHeaders@importdb_module@@AAEXPAVQAxObject@@0@Z) referenced in function "private: bool __thiscall importdb_module::readExcelFile(class QAxObject *,class QString &,class QString &)" (?readExcelFile@importdb_module@@AAE_NPAVQAxObject@@AAVQString@@1@Z) importdb_module.obj importdb_module@

    Seems like it's because QAxObject, but I already included QAxContainer. I got no idea why it appears

  • Oh, sorry, I fixed it! I forgot to wrote

    @importdb_module::@ before @getTableHeaders@ function!

    Thank you, SGaist!

  • Lifetime Qt Champion

    You're welcome !

    Since you have it working now, please update the thread title prepending solved so other forum users may know a solution has been found :)

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