Can somebody show how to read bytes?

["BumbleBee"]

Well,I have tried many different combination with different syntax...I cannot post a certain code,as there were many things I tried..

Can you please post a working piece?

[high_flyer]

Post the the code you thought was the best of the things you tried, and we can pick it up from there.

["BumbleBee"]

Sure.
Well I made this:

#include <QtCore/QCoreApplication>
#include <QFile>
#include <QDebug>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    QFile f("C:\\Program Files (x86)\\TeamViewer\\Version6\\TeamViewer.exe");
        if( !f.exists() )
 
             {
              // It does not exist
               qDebug() << "The file does not exist.\n";
             }
 
            // It exists, open it
             if(!f.open(QIODevice::ReadOnly))
             {
              // It could not open
               qDebug() << "Failed to open.";
 
               return 0;
             }
 
            // It opened, now we need to close it
             qDebug() << "Success";
 
             int size = f.size();
             qDebug() << "size: " << size;
 
            QDataStream data(&f);
            char * buffer;
            uint u = sizeof(f);
            data.readBytes(buffer,u);
 
 
             f.close();
             return a.exec();
}

#include <QtCore/QCoreApplication>
#include <QFile>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QFile f("C:\\Program Files (x86)\\TeamViewer\\Version6\\TeamViewer.exe");
        if( !f.exists() )

             {
              // It does not exist
               qDebug() << "The file does not exist.\n";
             }

            // It exists, open it
             if(!f.open(QIODevice::ReadOnly))
             {
              // It could not open
               qDebug() << "Failed to open.";

               return 0;
             }

            // It opened, now we need to close it
             qDebug() << "Success";

             int size = f.size();
             qDebug() << "size: " << size;

            QDataStream data(&f);
            char * buffer;
            uint u = sizeof(f);
            data.readBytes(buffer,u);


             f.close();
             return a.exec();
}

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Then I thought that I may need to make a loop,in order to read a byte after byte..but still nothing.

[wysota]

The code doesn't make much sense really. Why don't you just use QIODevice::read() on your QFile object?

[mcosta]

Sorry,

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    QFile f("C:\\Program Files (x86)\\TeamViewer\\Version6\\TeamViewer.exe");
 
....
             int size = f.size();
             qDebug() << "size: " << size;
 
            QDataStream data(&f);
            char * buffer;
            uint u = sizeof(f);
            data.readBytes(buffer,u);
 
 
             f.close();
             return a.exec();
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QFile f("C:\\Program Files (x86)\\TeamViewer\\Version6\\TeamViewer.exe");

....
             int size = f.size();
             qDebug() << "size: " << size;

            QDataStream data(&f);
            char * buffer;
            uint u = sizeof(f);
            data.readBytes(buffer,u);


             f.close();
             return a.exec();
}

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what you're doing??

1. You're using a pointer "buffer" as array of bytes (WRONG)
2. You're using sizeof of an object as amount of data to read (WRONG)

for 1. it's strange that your program doesn't crash

I suggest you

int size = f.size();
    qDebug() << "size: " << size;
 
    QByteArray buffer = f.read (size);

int size = f.size();
    qDebug() << "size: " << size;

    QByteArray buffer = f.read (size);

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and use directly "buffer"