CODEWITHSUNDEEP
c++qtqt5
m61566
m61566

Reputation: 41

Piping data of QIODevice

I have one QIODevice which receives data from an undefined source. What i want to do is Dump all data to a file being sent from QIODevice, but if i read then another handler which depends on original data changes.

Basically what i want is 

void piping( QIODevice* Data )
{
    if ( outgoingData )
    {
        qDebug()<<Data->readAll();
    }

    // gets nothing as readAll has already consumed all data 
    dependentOn(Data);
}

function dependentOn is not defined by me, so i cannot change its definition.

Upvotes: 1

Views: 544

Answers (1)

Murat Şeker
Murat Şeker

Reputation: 1711

qint64 QIODevice::peek(char * data, qint64 maxSize) is what you want.

From the documentation :

qint64 QIODevice::peek(char * data, qint64 maxSize)

Reads at most maxSize bytes from the device into data, without side effects (i.e., if you call read() after peek(), you will get the same data). Returns the number of bytes read. If an error occurs, such as when attempting to peek a device opened in WriteOnly mode, this function returns -1.

Reference : http://doc.qt.io/qt-5/qiodevice.html#peek

Upvotes: 2

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