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Message: [QUOTE="James Kanze, post: 3910735"] That's certainly one problem, but Jonathan is also right. You can't use fread and fwrite (nor istream::read and istream::write) on the structure you've defined. If it works, it's only by chance. In general, binary dumps of anything but char only work within the same process---you can't reread the data from code compiled with a different compiler, or sometimes different version of the same compiler or with different compiler options. And even within the same process, you're restricted to PODs without pointers. [/QUOTE]