Hi, Erik,
Thanks a lot! It works now.
Best regards
Tao
-------------------------------
Tao Peng
CUBIN Research Centre,EEE Dept.
Melbourne Uni., Australia
Phone: + 61 3 8344 3822
Fax: + 61 3 8344 3821
Mobile: 0402 947 026
-------------------------------
On Tue, 3 Feb 2004, Erik de Castro Lopo wrote:
> On Tue, 3 Feb 2004 15:44:41 +1100 (EST)
> Tao Peng <[EMAIL PROTECTED]> wrote:
>
> > Dear All,
> >
> > I am a rookie to network programming, and I am having troubles of compling
> > a single code.
> >
> > The code is as follows:
> > ******************************************************
> > #include <stdio.h>
> > #include <pcap.h>
> > int main()
> > {
> > char *dev, errbuf[PCAP_ERRBUF_SIZE];
> > dev = pcap_lookupdev(errbuf);
> > printf("Device: %s\n", dev);
> > return(0);
> > }
> > ******************************************************
> >
> > when I complie it using gcc, it gives me an error as follows:
> > /var/tmp//cc95eETb.o: In function `main':
> > /var/tmp//cc95eETb.o(.text+0x1e): undefined reference to `pcap_lookupdev'
>
> This is a linker message not a compiler message (you can tell from the
> /var/tmp//*.o).
>
> That means that the compiler had no problem with the C code, but that the
> linker was not able to find the object file that defined 'pcap_lookupdev'.
>
> > But I had my pcap.h included, and I don't know why. Can anyone help me
> > about this?
>
> You were probably doing something like:
>
> gcc program.c -o program
>
>
> What you need is:
>
> gcc program.c -lpcap -o program
>
> The "-lpcap" tells gcc to tell the linker to link to libpcap. If libpcap
> is installed in a non-standard location you might need to do something
> like this:
>
> gcc procgram.c -L/some/path -lpcap -o program
>
> HTH,
> Erik
> --
> ------------------------------------------------------
> [N] Erik de Castro Lopo, Senior Computer Engineer
> [E] [EMAIL PROTECTED]
> [W] http://www.sensorynetworks.com
> [T] +61 2 83022726
> [F] +61 2 94750316
> [A] L4/140 William St, East Sydney NSW 2011, Australia
> ------------------------------------------------------
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