Winpcap help

Pordo

Hello! I'm using version 6.3 of Qt Creator and I'm trying to use winpcacp version 4.1.2 library (I'm download from here https://www.winpcap.org/devel.htm). I am trying to run the first example code of the winpacp manual but I get the following errors and I do not know how to fix it:

:-1: error: debug/main.o:C:\Users\lucas\Desktop\build-prueba2-Desktop_Qt_6_3_1_MinGW_64_bit-Debug/../prueba2/main.cpp:22: undefined reference to `pcap_findalldevs_ex'

:-1: error: debug/main.o: in function `main':

C:\Users\lucas\Desktop\prueba2\main.cpp:44: error: undefined reference to `pcap_freealldevs'

:-1: error: collect2.exe: error: ld returned 1 exit status

:-1: error: [Makefile.Debug:68: debug/prueba2.exe] Error 1

Here is the code:
In .pro file I have:
QT -= gui

CONFIG += c++17 console
CONFIG -= app_bundle

SOURCES +=
main.cpp

//# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

INCLUDEPATH += C:/Users/lucas/Desktop/prueba2/WpdPack/Include
LIBS += "-LC:/Users/lucas/Desktop/prueba2/WpdPack/Lib/x64"

DEFINES += WPCAP
DEFINES += HAVE_REMOTE

And in main.cpp I have:
#include <stdlib.h>
#include <stdio.h>
#include <pcap.h>

using namespace std;

int main()
{
pcap_if_t *alldevs;
pcap_if_t *d;
int i=0;
char errbuf[PCAP_ERRBUF_SIZE];

/* Retrieve the device list from the local machine */
if (pcap_findalldevs_ex((char*)PCAP_SRC_IF_STRING, NULL /* auth is not needed */, &alldevs, errbuf) == -1)
{
    fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
    exit(1);
}

/* Print the list */
for(d= alldevs; d != NULL; d= d->next)
{
    printf("%d. %s", ++i, d->name);
    if (d->description)
        printf(" (%s)\n", d->description);
    else
        printf(" (No description available)\n");
}

if (i == 0)
{
    printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
}

/* We don't need any more the device list. Free it */
pcap_freealldevs(alldevs);
return 0;

}

JonB

@Pordo
Your line

LIBS += "-LC:/Users/lucas/Desktop/prueba2/WpdPack/Lib/x64"

tells the linker where to look for libraries. That's good. But you also have to tell it what library there you want it to link with. Something like

LIBS += "-LC:/Users/lucas/Desktop/prueba2/WpdPack/Lib/x64" -lpcap

See what I've added at the end? I thought you had something like this in your other post? Your instructions must tell you this, I don't know what the library is actually called.

JonB

@Pordo
I seem to have tried to help you in your other post(s) about this issue, to no avail. You now open a new one.

Your error is a linker error. Where exactly do you actually link with whatever "pcap" library, because I do not see anything?

Pordo

sorry it's the first time I've used a forum, as it was a different code from an example that I saw I thought I had to open another post.

from the other post, today I try to put the path I put in this new code and Qt stop giving problems when compiling the #include<pcap.h>
the problem was that I was putting ...WpdPack/Lib and it was ...WpdPack/Lib/x64

After that, I try to use the example from the manual and now I have this new problem. For your question Where exactly do you actually link with whatever "pcap" library, because I do not see anything? I don't know where I can check that

I see in another pages that the Winpcap have to linker but I dont know how to make that. I thought that with the INCLUDEPATH and LIBS I make this linker but I'm not sure

JonB

@Pordo
Your line

LIBS += "-LC:/Users/lucas/Desktop/prueba2/WpdPack/Lib/x64"

tells the linker where to look for libraries. That's good. But you also have to tell it what library there you want it to link with. Something like

LIBS += "-LC:/Users/lucas/Desktop/prueba2/WpdPack/Lib/x64" -lpcap

See what I've added at the end? I thought you had something like this in your other post? Your instructions must tell you this, I don't know what the library is actually called.

Pordo

Thanks a lot! now I understand well why it was that of L and l. Try that and it works!