Am 08.11.2013 10:15, schrieb Yves Bailly: > Le 08/11/2013 10:05, Giuseppe D'Angelo a écrit : >> On 8 November 2013 10:01, Yves Bailly <[email protected]> wrote: >>> As a float is 4 bytes, I would expect the second f.pos() to display "4"... >>> but >>> it displays "8", as if QDataStream had moved 8 bytes ahead instead of just >>> 4. >>> Needless to say, the read float is wrong... >>> >>> Am I missing something here, or is it a bug? >> See QDataStream::setFloatingPointPrecision. The default is double. > That's pretty strange... what if I want to read a float then a double? do I > have to switch between the two each time? > Does this means it's impossible to use code like this: > float f; > double d; > datastream >> f >> d; > ? setFloatingPointPrecision does only change the way the floating point numbers are stored in the data stream, not what you read from it. Also I think you're wrong in what you want to do. You can't read data from a file which was not stored with QDataStream before! See http://qt-project.org/doc/qt-5.0/qtcore/qdatastream.html#details
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