How to save binary file from QByteArray rather than QTextStream

harveyab

I am working on a binary file editor (not quite a hex editor).
I started with the mdi example supplied with Qt.
I changed the opening of the file to binary.
But don't know what I'm doing to use a QByteArray instead of QString.
So here is the save file function with my failed attempt indicated:

bool MdiChild::saveFile(const QString &fileName)
{
    QFile file(fileName);
    if (!file.open(QFile::WriteOnly)) {  // was | QFile::Text)) {
//      ...
        return false;
    }

//    QTextStream out(&file);  // What I had
    QByteArray out(&file);   // What I want
    out << toPlainText();

    setCurrentFile(fileName);
    return true;
}

Gives error:

/home/.../mdichild.cpp:120: error: no matching function for call to 'QByteArray::QByteArray(QFile*)'
     QByteArray out(&file);
                         ^

I understand that QByteArray is not a stream, but don't know what to do here.
Also not yet comfortable knowing what can be overloaded or modified in classes -- for QPlainTextEdit()
Thank you.

Rondog

Instead of using QByteArray as a type of 'QTextStream' you should probably do it this way:

{
    QFile file(fileName);
    if (!file.open(QFile::WriteOnly)) {  // was | QFile::Text)) 
    {
       //      ...
        return false;
    }
    // assuming you need a QByteArray()
    QByteArray data(this->toPlainText().toLatin1());
    file.write(data);

    // or cut out the middle man
    file.write(this->toPlainText().toLatin1());
    
    setCurrentFile(fileName);
    return true;
}

Note: If you are looking to convert the binary file data to and from hexadecimal QByteArray has functions 'toHex()' and 'fromHex()' which work quite well.

harveyab

@Rondog Thank you. After a good nap I figured out what I needed. Your post confirmed it. (I didn't need the toLatin1(); either.)