adding dependencies to QT Project

sm2770s · wrote on 5 Feb 2021, 08:16

I have created an QT Widget Project, later i added extra cpp files and corresponding headers to this QT Project. Since I added extra source files and headers to this project, I also updated my .pro file with the following three additional lines

LIBS += -lwsock32
LIBS += -lws2_32
LIBS +=  -lkernel32  -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -luuid -lodbc32 -lodbccp32

I have added this because previously with added cpp files and header i built visual project so i copied all this from visual project.

But while building the QT Project i am getting errors.
The following error is being shown by qt for one of the cpp file which i added

error: 'inet_pton' was not declared in this scope
  if (inet_pton(AF_UNSPEC, name, &ip) == 1)
                                    ^

As per my understanding inet_pton comes from WS2tcpip.h and AF_UNSPEC comes from ws2def.h.

The below dependencies are found from visual studio project

wsock32.lib
ws2_32.lib
kernel32.lib
user32.lib
gdi32.lib
winspool.lib
shell32.lib
ole32.lib
oleaut32.lib
uuid.lib
comdlg32.lib
advapi32.lib

I am new to QT and also this is my first project in QT. I added this LIBS based on some of the forum previous questions but I am not sure where I am doing wrong?

Christian Ehrlicher · 5 Feb 2021, 08:26

You have to include the correct header where the function is defined. Has nothing to do with linking later on.

sm2770s · 5 Feb 2021, 08:38

@Christian-Ehrlicher Hi Christian. Thanks for your suggestion. To be clear you mean that i need to include those specific headers using INCLUDE in .Pro file?

Christian Ehrlicher · 5 Feb 2021, 08:38

Since when do you add include files to the INCLUDE path?

JonB · wrote on 5 Feb 2021, 08:38

@sm2770s
The error is an undefined function call while compiling. @Christian-Ehrlicher is talking about you requiring the necessary #include statement in your source file.

sm2770s · 2 May 2021, 08:39

@Christian-Ehrlicher Sorry for not getting you.
This is my .pro file


QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Something
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
INCLUDEPATH += C:\TestRepos\Rep_Test\libs\eigen\include\eigen3\Eigen

LIBS += -lwsock32
LIBS += -lws2_32
LIBS +=  -lkernel32 -lkernel32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -luuid -lodbc32 -lodbccp32


SOURCES += \
        main.cpp \
        widget.cpp \
    source1.cpp \
    source2.cpp \
    source3.cpp \
    source4.cpp

HEADERS += \
        widget.h \
    head1.h \
    head2.h \
    head3.hpp \
    head4.hpp \
    head5.hpp

FORMS += \
        widget.ui

RESOURCES += \
    resource.qrc

I am not getting what you are saying. Sorry for being dumb :-(

JonB · 5 Feb 2021, 08:48

@sm2770s
Your reply has just crossed with mine above.

sm2770s · 2 May 2021, 08:53

@JonB . I think i already added necessary include statement in source file where i am having Problems. I am not sure if you are saying this :-). But I will also go through code and needed documentaion once. Thanks for giving some insights will do some homework on it then comeback again and will update solution if i found one.

#include "head2.h"

#include <cstdlib>
#include <cstdio>
#include <cstring>


#if defined(_WIN32) || defined(WIN32) || defined(_WIN64)
	#define OS_WIN  
#else
	#define OS_UNIX  
#endif

#ifdef OS_UNIX
	#include <unistd.h>
	#include <netdb.h>
	#include <sys/socket.h>
	#include <sys/time.h>
	#include <netinet/in.h>
	#include <arpa/inet.h>
#endif
#ifdef OS_WIN
	#include <ws2tcpip.h>
	#include <winsock2.h>
	#include <windows.h>
#endif

JonB · 2 May 2021, 09:03

@sm2770s
Either your reference to inet_pton lies in some file other than the one you show, or you should read e.g. https://stackoverflow.com/questions/15660203/inet-pton-identifier-not-found and compare the answers there to your exact situation (e.g. check your WINVER). Actually, I believe the accepted solution there might be saying you need #include <arpa/inet.h>, even though you are Windows not Linux, but have a read and see what you think.

sm2770s · 2 May 2021, 10:34

@JonB said in adding dependencies to QT Project:

Either your reference to inet_pton lies in some file other than the one you show, or you should read e.g. https://stackoverflow.com/questions/15660203/inet-pton-identifier-not-found and compare the answers there to your exact situation (e.g. check your WINVER). Actually, I believe the accepted solution there might be saying you need #include <arpa/inet.h>, even though you are Windows not Linux, but have a read and see what you think.

Hi Jon! I am not sure but it was built successfully when i restarted my system. I am clueless what happened but it worked when i restarted. Even I tried to reproduce the error but till now not successful in reproducing error again.

JonB · 5 Feb 2021, 10:36

@sm2770s
Well this really isn't an error message which should appear/disappear on system restart!

Anyway, yes, mark topic as solved (either from Topic Tools at bottom, or mark your own reply post above as the "solution"). You can always re-open it if it occurs again soon.

sm2770s · J JonB 5 Feb 2021, 10:32

@JonB Ya! The error shouldnt go but i dont know what happened. I will close this issue as of now and this weekend i will try to reproduce then will update my comment later.