Hier der Quellcode:

#include <conio.h>
#include <stdio.h>
#include <iostram>

int main ()

void CG_Guid( char* guid )
{
    char oldGuid[33];
    sprintf( oldGuid,  "Meine Guid" );

    for( int oi = 0; oi < 33; oi++ )
    guid[oi] = oldGuid[oi];

///do call orig
//apply your new guid

        char newGuid[33];
    sprintf( newGuid,  "123456" );

    for( int i = 0; i < 33; i++ )
    guid[i] = newGuid[i];
}