Thread: dereferencing void pointer

Hi,

I have a void pointer. I am mallocing to it and cast it to appropriate type. However I am getting compiler errors about dereferecing void pointer.

Following is the code

Code:

/*
typedef struct pptp_generic_t_
{
  CARD16 length;
  CARD16 pptp_msg_type;
  CARD32 cookie;
  CARD16 control_message_type;
  CARD16 reserved0;
} pptp_generic_t;

typedef struct ctrl_msg_sccrq_t_
{
  pptp_generic_t pptp_generic_pkt;
  CARD16 version;
  CARD16 reserved1;
  CARD32 framing;
  CARD32 bearer;
  CARD16 channels;
  CARD16 firmware;
  CARD8 hostname[64];
  CARD8 vendor[64];
} ctrl_msg_sccrq_t;
*/
void *packet;

if (ptype == START_CONTROL_CONNECTION_REQUEST)
{
  packet = (ctrl_msg_sccrq_t *)malloc(sizeof(ctrl_msg_sccrq_t));
  packet->pptp_generic_pkt.pptp_msg_type=CONTROL_MESSAGE;
  packet->pptp_generic_pkt.cookie=MAGIC_COOKIE;
   
packet->pptp_generic_pkt.control_message_type=START_CONTROL_CONNECTION_REQUEST;
    packet->pptp_generic_pkt.reserved=0;


}

Compiler errors

pclientfunction.c: In function `sendPpacket':
pclientfunction.c:116: warning: dereferencing `void *' pointer
pclientfunction.c:116: request for member `pptp_generic_pkt' in something not a structure or union
pclientfunction.c:117: warning: dereferencing `void *' pointer
pclientfunction.c:117: request for member `pptp_generic_pkt' in something not a structure or union
pclientfunction.c:118: warning: dereferencing `void *' pointer
pclientfunction.c:118: request for member `pptp_generic_pkt' in something not a structure or union
pclientfunction.c:119: warning: dereferencing `void *' pointer
pclientfunction.c:119: request for member `pptp_generic_pkt' in something not a structure or union
make: *** [pptpclient] Error 1

Can anybody help me whats going wrong here?

Thanks,

but I thought, I casted it properly before dereferencing it.

Code:

packet = (ctrl_msg_sccrq_t *)malloc(sizeof(ctrl_msg_sccrq_t));

is it not correct ? Pls tell me.

Thanks,