Memory allocation for a file

Hi All,

Is there a way that I can pre-allocate memory for a file? If vector elements are being assigned values in a for loop, for example, we pre-allocate memory by create the vector containing zeros. Is there some thing similar that can be done for a file being written into inside a for loop?

I open the file using fopen. Then I initiate a for loop to write data into it using fwrite and then close the file using fclose. So, I was wondering if it is possible to pre-allocate a chunk of memory for the file in an attempt to speed things up.

Thanks.

- RN

Answer 1

[Walter Roberson]

Yes. Use fseek() to seek forward to the position of the last byte you want, and write a byte there, and then fseek() back to the beginning.