vpCaptureMemSafe -> Source Code

[Lorenzo VBPCAP Founder]

vbLong VBPCAPAPI vpCaptureMemSafe(LPSAFEARRAY FAR *buffer){


//Pointer to PVDATA member

vbByte * tmp=(vbByte *) (*buffer)->pvData;

/*Some nasty vars:
res= return code from winpcap
header=winpcap packet header
pkt_data=raw packet data
/*

long res;
struct pcap_pkthdr *header;
u_char *pkt_data;


//If working flag not 1 than vpBegin must be called first

if (!WORKING){
SetExtError(EXT_ERROR_INVALIDOPERATION);
return VBPCAP_ERROR_FAILURE;
}

//Check for a valid DEVICE handle returned by WINPCAP after the pcap_open
//And Get The Packets

if (Handle==NULL) return VBPCAP_ERROR_FAILURE;
res= pcap_next_ex(Handle, &header,&pkt_data);


// Erroro on res=-1

if (res<0)
return VBPCAP_ERROR_FAILURE;


if (res > 0)
{

//Lock the array

SafeArrayLock(*buffer);


//If array is too small for the captured packet report the error

if ((*buffer)->rgsabound[0].cElements < header->caplen+1){
SetExtError(EXT_ERROR_BUFFSMALL);
return VBPCAP_ERROR_FAILURE;
}

//Copy the buffer end exit

memcpy(tmp,pkt_data,header->caplen+1);
}
SafeArrayUnlock(*buffer);
return res;

}