[QT learning] sketch qiodevice: Text Parameter

Tag: QT binary C ++

Sketch qiodevice: Text parameter:

QIODevice::Text

0x0010

After this option is used: For the read: end-of-line terminator, it is translated as '\ n'; For the write: the end-of-line terminator is translated into characters corresponding to the local encoding method. For example, in Win32, It is '\ r \ n'

When the qiodevice: Text option is used to read and write binary files, the read and write data inconsistency is caused by the translation. The test example is as follows:

 if (!fileRead.open(QIODevice::ReadOnly | QIODevice::Text)) {        qDebug() << "file open error!\r\n";        //return (0); } if (!fileWrite.open(QIODevice::WriteOnly | QIODevice::Text)) {        qDebug() << "file not exist!\r\n"; }

Yes,0x0d in the original binary file is regarded as the Terminator, which is ignored during writing. 0x0a is translated as 0x0d 0x0a (\ r \ n) in Win32).

After the qiodevice: Text option is removed, the read and write data is consistent (the test data volume is 8 kb in multiple bytes ):
if (!fileRead.open(QIODevice::ReadOnly)) {        qDebug() << "file open error!\r\n";        //return (0);    }    if (!fileWrite.open(QIODevice::WriteOnly)) {        qDebug() << "file not exist!\r\n";    }

[QT learning] sketch qiodevice: Text Parameter