[Solved] How to use libcap in Qt?

MohammadReza · wrote on 24 Mar 2014, 04:47

Hello firends.
First excuse me because of my English writing.

I want to create an application by libpcap in Qt in Kali linux. I create similar application in windows & does work.

I download & install libpcap. Now, Qt recognizes pcap.h but some functions & constants does not work. like as: pcap_open - PCAP_OPENFLAG_PROMISCUOUS - pcap_findalldevs_ex - PCAP_SRC_IF_STRING - _snprintf_s.

The compiler errors similar as 'sth' was not declared in this scope. I use below headers but above errors apppear.

Are there anything to add to .pro file?

Thanks a lot.
Ya Ali.

andreyc · wrote on 24 Mar 2014, 05:12

Have you added pcap library to .pro file?
Something like
@
LIBS += -L/path/to/libpcap
LIBS += -lpcap
INCLUDEPATH += /path/to/libpcap/headers
DEPENDPATH += /path/to/libpcap/headers
@

MohammadReza · wrote on 24 Mar 2014, 05:29

I have a simple question.
I could find LIB path but how can I find INCLUDEPATH & DEPENDPATH?

andreyc · wrote on 24 Mar 2014, 05:33

These variables should point to the directory where pcap.h is located.
If you don't have pcap.h then you need to install dev package.

MohammadReza · wrote on 24 Mar 2014, 05:45

Thanks for your response Dear andreyc.
I added these code but 5 errors increased to 58 errors:

LIBS += -L/usr/lib/i386-linux-gnu/libpcap.so.1.3.0
INCLUDEPATH += /usr/include/pjlib-util/

andreyc · wrote on 24 Mar 2014, 05:47

Your set of LIBS is incorrect. It should be
@
LIBS += -L/usr/lib/i386-linux-gnu -lpcap
@

MohammadReza · wrote on 24 Mar 2014, 05:56

58 decreased to 43 errors but strange errors exists such as:
memcmp was not declare ...
or
::memset has not been declared
etc
I dont use them & some of them are in qstring.h.

andreyc · wrote on 24 Mar 2014, 06:09

Could you put the error log here.

MohammadReza · wrote on 24 Mar 2014, 06:27

A screen shot of some of the error:

!http://upload7.ir/imgs/2014-03/49544482189634377307.png(http://upload7.ir/imgs/2014-03/49544482189634377307.png)!

MohammadReza · wrote on 24 Mar 2014, 07:21

I thinks the above strange errors occured by INCLUDEPATH.
I replcae above code by this one & change some functions:
@
LIBS += -L/usr/local/lib/ -lpcap
@

now Just these errors:
pcap_open, PCAP_OPENFLAG_PROMISCUOUS and PCAP_SRC_IF_STRING was not declared in this code.

I searched & I think above functions & constants does not exist in libpcap (just exist in winpcap)

However, Thake be to GOD & Thanks to Dear andreyc.

andreyc · wrote on 24 Mar 2014, 16:24

Glad to hear that you've resolved the issue.

Could you put "[SOLVED]" in front your initial subject that other people will see that the issue is resolved.

Regarding many errors introduced by INCLUDEPATH
I guess you missed plus sign in you .pro files and made all standard headers invisible for qmake.
It is important to use '+=' not just '=' in INCLUDEPATH
@
INCLUDEPATH += /some/additional/path/that/wont/break/build
@