'Open with' & compiler problems

[SenseiTakeshi]

Hello, i'm trying to make a text edit but i've problems with "open with".
I would like that when i'm on my desktop and right click on a file (.txt for instance) -> open with -> MyApp, the text shows in a QTextEdit

For now, i've that :

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QString file = QFileDialog::getOpenFileName(this, "Open a file",  "", tr("Text files (*.txt) ;; All files (*.*)") );
 
    if ( !file.isEmpty() )
    {
        QFile sFile ( file );
        if ( sFile.open(QFile::ReadOnly | QFile::Text) )
        {
            QTextStream in(&sFile);
            QString text = in.readAll();
            sFile.close();
 
            ui->textEdit->setPlainText(text);
        }
    }
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QString file = QFileDialog::getOpenFileName(this, "Open a file",  "", tr("Text files (*.txt) ;; All files (*.*)") );

    if ( !file.isEmpty() )
    {
        QFile sFile ( file );
        if ( sFile.open(QFile::ReadOnly | QFile::Text) )
        {
            QTextStream in(&sFile);
            QString text = in.readAll();
            sFile.close();

            ui->textEdit->setPlainText(text);
        }
    }
}

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But it doesn't do what I would like. :'(

---------------------------------------------

My second problem is when I call :

QFileDialog::getOpenFileName
or
QFileDialog::getSaveFileName

QFileDialog::getOpenFileName
or
QFileDialog::getSaveFileName

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there is a little message in debug :

shell\comdlg32\fileopensave.cpp(9456)\COMDLG32.DLL !764F0750: (caller: 764E3458) ReturnHr[PreRelease](1) tid(630) 80070490 Element not found.
CallContext:[\PickerModalLoop\InitDialog\FileDialogInitEnterpri seData]

despite this, it works anyway. How can i solve this "false" error ?

---

Added after 1 3 minutes:

i solved my first problem, I used

if (QApplication::arguments().size() > 1) {
    const QString FILENAME = QApplication::arguments().at(1));
}

if (QApplication::arguments().size() > 1) {
    const QString FILENAME = QApplication::arguments().at(1));
}

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so it returns me the path and the name of the file i wanna open.
source : http://stackoverflow.com/questions/3...qt-application

-----------------

My second problem is still unsolved.