Quote Originally Posted by jaca View Post
The values inside of file are all float.
Oh, very nice, but float in which endianness? Of what length? QDataStream needs to take that all into consideration thus it stores additional information in the stream and expects that information to be present when reading the stream.

Does not exist a form in Qt to catch these values of file?
What for if std::fstream already does that? If you keep an unportable data in a file, you need an unportable solution to it. QDataStream is not one. Use QIODevice::read() and cast or convert the output into the format you know is suitable.

Quote Originally Posted by jaca View Post
They see as I made. It gave certain, but it wanted to use Qt.
Qt is not a panaceum. It is meant to provide portable solutions and yours is not portable thus it is not supported by Qt.