There is no memory allocation going on. iphdr is declared as a pointer and with the line: (iphdr = (IPV4_HDR *)(Buffer + sizeof(ETHER_HDR)); the pointer simply points to the ip hdr part of the packet. In c you allocate memory with malloc/calloc and those need to be freed, but that is not the case in this sourcecode.

I did some changes to eleminate errors I got:

line 127: u_char -> char
line 128: u_char *pkt_data -> const u_char *pkt_data

This is also the way how it is shown in the winpcap-tutorial and the errors are gone.

But I can’t eleminate an error in line 205 in the ProcessPacket-Function:

error: cannot convert ‘const u_char *’ in ‘u_char *’

If I change ‘u_char* Buffer’ in line 217 to ‘const u_char* Buffer’, the error isn’t gone and I get a lot more errors.

What can I do ???

Thanks in advance and excuse my english. I’m not in training :-)

A simple cast can solve this.
Regards.

try to set ShowProgress option to true in linker properties in order to see whether the linker searches for wpcap.lib file or not. If not, then maybe the linker is confused about the file’s directory i.e there may be 2 folders that contain the lib file. In this case all you need to do is to delete one of them. Unresolved external symbols problem is related to functions that are declared but not defined.

same here :/ have you solved this problem?

cannot convert u_char to char etc ..