Re: binary files in C++

[Marc Hernandez <marc@ias.jb.com>]

On Wed, 24 May 2000, Matthew J Burke wrote:

> Help! I'm trying to modify a binary file, and I've degraded to simply
> trying to copy it using fwrite in string.h.  It run and spits out a
> slightly different binary file.  Can anybody find anything worng with this
> rough-up of my prog?

> int main{
> filepointer infile(infilename, rb), outfile(outfilename, wb)
> fread( char *buffer, size, file_length, infile)

	It appears you do not allocate any space for the buffer here.
Since files can be huge and you do not want to create a 2gig buffer, I
would create a small buffer (char buffer[8192]; or somesuch) then loop
reading in a buffer full and writing out a buffer full.

> fwrite(buffer, size, file_lenght, outfile)

--
Marc Hernandez

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