Hello, all ...

I need to create a file and set it to a specific size (the idea being that there is another thread that uses std::ofstream::seekp() to write blocks to the file as they arrive off of the network, likely out of order, so if the 10th block of the file arrives before the 1st, I need to be able to handle it). The thing is, std::ofstream::seekp() doesn't seem to allow me to seek past the end of the file and set the file position there e.g. it sets the failbit true if I try. In C, I used to do this with feek(), so I could code something like this:

fseek( pFile, 10000000, SEEK_SET ); // makes the file 10000000 bytes long if it was shorter before

... but fseek() expects a long for the seek position, and this is 2006, where a long isn't big enough (files could be much larger than 4G). I have to do this in a portable way (Windows and Mac OSX / *nix).

Ideas?

Regards,

John, looking for a simple solution

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