Hi,
I''ve made this very program that opens a file, allocates a 64,000 byte buffer and reads data in from it, before closing it, opening another file, and then writing the data to it. However, it kept crashing, so I added some debug printfs. The code looks like:-
#include <stdio.h>
int main(void)
{
FILE *fp;
unsigned char *screen;
fp = fopen("image", "rb");
printf("Opened image\n");
screen = (unsigned char *)malloc(64000);
if (screen == NULL)
{
printf("Error: malloc\n");
fclose(fp);
return(-1);
}
printf("Allocated 64,000 bytes\n");
fread(screen, 64000, 1, fp);
printf("Data read into buffer\n");
fclose(fp);
printf("Closed image\n");
fp = fopen("data.raw", "wb");
printf("Opened data.raw");
fwrite(screen, 64000, 1, fp);
printf("Data written from buffer\n");
fclose(fp);
printf("Closed data.raw");
return(0);
}
The output from this is:-
Opened image
Error: malloc
Is 64,000 bytes too much memory?!?
It won''t always be that much, so a static array allocated at the beginning is not that answer.
This was compiled under Borland Turbo C++ 3.0. If I try to compile it using a large memory model and then run it, it appears to allocate the memory ("Allocated 64,000 bytes") then I get a big nasty "Windows Protection Error, you must restart your computer". Pfft.
Any ideas?
