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Message: [QUOTE="Irrwahn Grausewitz, post: 1682918"] [email]rouben@pc18.math.umbc.edu[/email] (Rouben Rostamian) wrote: Well, there are two problems: 1) stdout need not be a modifiable lvalue, so you can't just use fopen - you cannot come up with a suitable filename anyway. To solve this, one could come up with reopen( NULL, "wb", stdout); running into problem number 2) It is implementation defined which (if any) and under what circumstances mode changes are permitted. That would be great, but unfortunately it's impossible. stdin, stdout and stderr are text streams per definition, and there is no portable way to switch them to binary mode. I cannot come up with a better solution, sorry. Regards [/QUOTE]