how to reads two files at the same time : c++

eng2009 · #1 04-16-2009, 09:14 AM

I have to to do an application with accelerometers,inside a loop while(1) I need to read 2 files each file contains the actual information of an accelerometer, I think there is a method that is better than open the first and read its information, then close it, and open the seconde and read it and then close it and return to the first ....
This method is very slow, is there a better method??

Rebecca · #2 09-29-2009, 01:17 AM

Use fgetpos() and fsetpos(), which are designed for use with huge files.
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#include <stdio.h>

int main()
{
int c;
fpos_t pos;
FILE* f = fopen( "myfile", "r+b" );
while (true)
{
fgetpos( f, &pos );
c = fgetc( f );
if (c == EOF) break;
c = encrypt( c );
fsetpos( f, &pos );
fputc( c, f );
}
fclose( f );
return 0;
}

That should definitely work...

Thanks and Regards
Rebecca Phillips

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