C / C++ / MFC

// crt_access.c
// compile with: /W1
// This example uses _access to check the file named
// crt_ACCESS.C to see if it exists and if writing is allowed.

#include  <io.h>
#include  <stdio.h>
#include  <stdlib.h>

int main( void )
{
    // Check for existence.
    if( (_access( "crt_ACCESS.C", 0 )) != -1 )
    {
        printf_s( "File crt_ACCESS.C exists.\n" );

        // Check for write permission.
        // Assume file is read-only.
        if( (_access( "crt_ACCESS.C", 2 )) == -1 )
            printf_s( "File crt_ACCESS.C does not have write permission.\n" );
    }
}