C/Visual C - how to know if files exist or not??

in C++ or C?
how to know when a file already exist in the disk??
that way I don't overwrite it with a new file that the program is creating??

thanks

Read this example:

#include "stdio.h"
void main(int argc,char *argv[])
{
FILE *fp;
char c;
if(argc!=2) //argv[1] is the name of the file you want to open
{
printf("\nERROR, Parametros incorrectos");
exit(1);
}
if(fp = fopen(argv[1],"r") == NULL) //reading mode
printf("No se puede abrir el archivo");
else
{
printf("\nEl archivo existe. Y sera cerrado")
fclose(fp)
}
//your code...
} // End of main

suerte

Ismael: www.geocities.com/ismaelcamarero

Very easy. Here is an example:

FILE *my_file; /* the pointer */

my_file = fopen("C:\another_file.dat","rb");

You have to open the file in read mode, then you have to check if the pointer is NULL or not, if is NULL then the file doesn't exist.

if (my_file == NULL) /* if doesn't exsit */
printf("ERROR: CANNOT OPEN THE FILE, MAKE SURE THE PATH OR FILENAME IS CORRECT");
else /* if exist */
{
.....
.....
}

Remember it must be "rb".
If you use "w" or "wb" then you will overwrite the file or create a new file in case that the file doesn't exist.