Use output.put(i); since it takes one character at a time. But you really want to skip the for-loop and just write the whole vector in one write: output.write(f.data(), f.size()); 2 solved Save an unsigned char vector one by one
The int and unsigned int variables take exactly the same amount of memory and represented in the resulting assembly code in exactly the same way. Thus adding unsigned here changes nothing from the performance point of view. In general you should not worry. The loop counter is definitely not the biggest memory consuming thing in … Read more