CList class

packetlos

Hi, What is the best way of using MFC's List to store data of this type?

typedef struct DATAGRAM
{
	UINT packetID;			// Sequence Number
	ip_header* ipHeader;		// IP header
	pcap_pkthdr* wpHeader;		// Winpcap header
	const UCHAR* pkt_data;		// Packet data
} DATAGRAM;

ipHeader* etc are pointers to further structs. I tried plain CList DATAGRAM, DATAGRAM& and are having problems with code like:

packetCapture.AddTail(filledStruct);

The addtail is in a fairly fast loop and added data is going in fine and coming out of the list corrupted (due to something going out of scope before the operation is completed perhaps?) I am probably doing something extremely retarded, any ideas?

Ravi Bhavnani

Did you mean to do this instead?

packetCapture.AddTail (&filledStruct);

Also remember that filledStruct must be in scope for its address to be valid when you access the list after populating it. You might want to consider new()ing instances of DATAGRAM and adding those instances to the list. They will be around as long as your application runs since they're created on the heap. Be sure to free up this memory before your app exits. /ravi My new year's resolution: 2048 x 1536 Home | Articles | Freeware | Music ravib@ravib.com