Problem to reset QVector

[LodiCode]

Hello guys,

I made a struct like this:

struct VeiculoImages{
   int id;
   QByteArray img;
   QDate dateUpload;
};

I am using a QVector to store it, but i have a problem to delete all, when i use my QVector again its send me error "index out of range"

i am try use many ways to remove all elements but didn't work.

    images.erase(images.begin(), images.end());
//
images.clear();
// 
for(int i = images.size(); i>=0; i--){
    images.takeAt(i);
}

thanks alot for you time! sorry for bad english...

[Wieland]

Hi! Just use clear(). After that, the vector has a size of zero.

[LodiCode]

@Wieland don't work, i still getting out of range when i try to add new itens!

[Wieland]

@LodiCode Please show some code.

[LodiCode]

@Wieland

this is the error
ASSERT failure in QVector<T>::operator[]: "index out of range", file C:/Qt/Qt5.7.0/5.7/mingw53_32/include/QtCore/qvector.h, line 433

my function is

void Historico::getImages()
{
    query = Connection::getQueryInstance();


    ui->edit_imagens->clear();
    images.clear();

    query.prepare("SELECT * FROM veiculos_fotos WHERE veiculo_id=:veiculo_id");
    query.bindValue(":veiculo_id", veiculo_id);
    VeiculoImages veic;
    if(query.exec())
        while(query.next()){
            veic.id = query.value(0).toInt();
            veic.img = query.value(1).toByteArray();
            veic.dateUpload = query.value(3).toDate();
            images.push_back(veic);
        }

    for(int i =0; i<images.size(); i++){
        ui->edit_imagens->addItem("ID Foto = "+QString::number(images[i].id)+" | Data Upload ="+ images[i].dateUpload.toString("dd-MM-yyyy"));
    }
    Connection::getInstance(false);
}

my header is

#ifndef HISTORICO_H
#define HISTORICO_H

#include <QDialog>
#include "connection.h"

struct VeiculoImages;
namespace Ui {
class Historico;
}

class Historico : public QDialog
{
    Q_OBJECT

public:
    explicit Historico(QWidget *parent = 0);
    ~Historico();

private:
    Ui::Historico *ui;
    //private functions;
    void setupHistorico();
    void controlConnections();

    //vars
    QSqlQuery query;
    int veiculo_id; // get by placaToID()
    QString proprietarioByID(int);

    //moneys
    double gastosTotal = 0;
    double ganhosTotal = 0;
    double lucroTotal  = 0;
    QVector<VeiculoImages> images;

protected slots:
    void generateHistory();
    void placaToID();
    void loadInformations();

    //tables load
    void loadGastos();
    void loadGanhos();
    void loadNegociacao();

    //image load
    void getImages();
    void loadImages(int);
};

struct VeiculoImages{
   int id;
   QByteArray img;
   QDate dateUpload;
};
#endif // HISTORICO_H

[Wieland]

I don't see any reason why the code shouldn't work. Does the debugger really say that the line with "clear" triggers the exception?

[LodiCode]

@Wieland thanks for you help bro, my problem is solved, the error is logical, the vector and function clear is ok,

the problem is my connect(), i used a signal CurrentIndexChanged(), now i am change to activated(), when clear() is called it call another function that use the vector to get information about the images, and this function access out of range vector index!

[Andy314]

I have not read the whole thread, but in the first code is a simple index error yet.

for(int i = images.size(); i>=0; i--){
    images.takeAt(i);

Last index is size()-1 !

[LodiCode]

@Andy314 you is right my fault!