[Dev-C++] void to...

[Neszt T. <ne...@ss...>]

Hello!

I have a problem. First of all, see the source code:


This one is works:
/* -------------------------------------------------------------------- */
int putbuffer(                            /* returns 0 on success       */
    void *AppState,
    unsigned char *buffer,                /* buffer to put              */
    long length                           /* length of buffer           */
) {
  size_t ret;

  crc = CrcUpdate(crc, buffer, length);

  ret = fwrite(buffer, 1, (size_t) length, (FILE *) AppState);

  if ((size_t) length != ret)
    return 1;
  else
    return 0;
}




I tried to change it to work in memory instead of writing to file:

/* -------------------------------------------------------------------- */
int putbuffer_mem(                        /* returns 0 on success       */
    void *AppState,
    unsigned char *buffer,                /* buffer to put              */
    long length                           /* length of buffer           */
) {
  int i;

  crc = CrcUpdate(crc, buffer, length);

  for (i=0;i<length;i++) {
    char *AppState=buffer[i];   // #1
    AppState++;                 // #2
    printf("a\n");
  }
  return 0;
}

This second one does nothing as I check the AppState.
Can I use (void *) to allocate memory?
The original call was

putbuffer( (void *) out, .....)  ( out = fopen("name", "wb"); )


And now, I call

putbuffer_mem( mem, ....) ( mem = (char *) malloc(size); )


What would be the problem?

Is there any mode to mix the #1 and the #2 lines?


Thanks Your help in advance.

Regards,
  Neszt Tibor