Thread: tempnam() - when does it get deleted?

I have a program that optionally allows the user to overwrite the input file (binary) with the output file (text).

When I detect the output file is the same name as the input file, I create a temporary file, via tempnam(NULL), and write the output to it.

When finished writing, I close both the input file and output file, and then look to see if the original input file needs to be overlaid with the output file. If it does, I open the output file in ios::in mode and the input file in ios:ut mode and simply copy it over via in.read and out.write.

However, every time I end up with zero bytes read, and thus zero written. When I do not go through the overlay process, the output file is fine and has the data it is supposed to. When I do go through the overlay process, my counters from the primary process tell me the same amount of data was written. I have verified the output file does contains data from the primary operation.

Does anything in this process sound suspect?

Thanks, Todd

AFAIK, it only creates the temporary name, not the actual file.
So removing the file is still down to you.

http://www.cplusplus.com/reference/c...io/tmpnam.html
See also the difference with tmpfile()