[WinPcap-users] how to do packet filter with packet.dll ?

[rm386]

 I just use Packet Driver API to do some work.
 in the Packet.dll Samples,the testapp  Program  in the downloaded zip file 
wpdpack.zip.
 
 I just want add some packet filter code,but can't work ,It always said
"Unable to compile the packet filter. Check the syntax"   

My added code is in the below:

u_int netmask;
char packet_filter[] = "tcp dst port 25";
struct bpf_program fcode; 

 //compile the filter
        netmask=0xffffff; 
    if(pcap_compile((pcap_t *)lpAdapter, &fcode, packet_filter, 1, netmask) <0 ){
        fprintf(stderr,"\nUnable to compile the packet filter. Check the syntax.\n");
        PacketFreePacket(lpPacket);
        return -1;
    }
    
//set the filter
    if(PacketSetBpf(lpAdapter, &fcode)<0){
        fprintf(stderr,"\nError setting the filter.\n");
        PacketFreePacket(lpPacket);
        return -1;
    }

I think the error is that in the pcap_compile function ,the type of 1st param can't 
match

how can I compile the filter in packet.dll mode,not in the wpcap.dll mode

thx a lot!


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