Linking winsock library with `LIBS += -lws2_32` in Qt doesn't work?

Question

I've also tried linking with the path on my computer which is

C:\Qt\Tools\mingw48_32\i686-w64-mingw32\lib\libws2_32.a

but to no avail.

Is there any other way to link the winsock library?

Source code:

.pro file: http://privatepaste.com/2ac921e4f5

main.cpp: http://privatepaste.com/557fe9c297

These are the only two files that aren't at their original settings.

http://puu.sh/7KzWj.png the error I get after using pragma comment(lib, "Ws2_32.lib") I get these errors as well http://puu.sh/7KA1f.png — user3376098, Mar 26 '14 at 20:16
Again remove #pragma comment(lib, "Ws2_32.lib") comment if you are compiling with gcc or mingw. — drescherjm, Mar 26 '14 at 21:01
Please include relevant information in your question. Linking to external pastebins leads to link rot. — Remy Blank, Mar 26 '14 at 22:15

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

0

Are you using this example

Instead of pragma you could just add it using Project Properties (in Solution Explorer right click the project name and select properties)->Configuration Properties->Linker->Input and add ws2_32.lib to Additional Dependencies. In VS2010 this is a semicolon seperated list, so at the end, just before %(AdditionalDependencies), add ws2_32.lib; to the list.

THIS IS YOUR CODE

s1 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 
a.sin_addr.s_addr = inet_addr("127.0.0.1"); 
a.sin_family = AF_INET; 
a.sin_port = htons(1000);

a doesn't have those methods, the socket does, replace a with s1 please

The same goes for this:

lLength = connect(s1, (SOCKADDR*)&a, sizeof(a));

just a question

Why are you passing the main window

MainWindow w; 
w.show(); 
iResult = WSAStartup(MAKEWORD(2,2), &w);

to your WSAStartup??

Pass a WSADATA wsaData;

edited Jun 20 '20 at 09:12

Community

1
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answered Mar 26 '14 at 20:23

Claudiordgz

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This error is happening in Qt not VS. Perhaps I should have specified that in the title. – user3376098 Mar 26 '14 at 20:26
[Check here](http://stackoverflow.com/questions/1742273/qt-creator-with-winsocks-ws2-32) – Claudiordgz Mar 26 '14 at 20:31
I've already tried everything in that thread. – user3376098 Mar 26 '14 at 20:41
we'll need a minimal working example of your problem, specifically the include files – Claudiordgz Mar 26 '14 at 20:42
Ok I'll add the source code of my program in its entirety in my main post. – user3376098 Mar 26 '14 at 20:44
**minimal working example** – Claudiordgz Mar 26 '14 at 20:51
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Try adding LIBS += -lws2_32 to your .pro file and pragma comment(lib, "Ws2_32.lib") to your main.cpp file. Afterwards add this: http://privatepaste.com/f39fd056a2 code to your main.cpp file and see if it compiles. – user3376098 Mar 26 '14 at 20:56
Gives me the same error, it's because winsock library isn't linked. – user3376098 Mar 26 '14 at 21:05
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did you removed the pragma as well? and removed the extra `LIBS += -lws2_32` on you pro file? – Claudiordgz Mar 26 '14 at 21:07
Oh I know why it didn't work, because I named my variables the same as the default Qt variables. – user3376098 Mar 26 '14 at 21:11
There are no errors now except for: http://puu.sh/7KEVk.png And my program doesn't connect to the server I want it to because the program doesn't have the winsock library. – user3376098 Mar 26 '14 at 21:13
I know, try to be more verbose with your variables, but not too verbose. But for example MainWindow w... w doesn't tell you anything, so after 10000 lines of code where you see w you'll start asking yourself what was w in the first place. I recommend reading `Code Complete` by Steve McConell – Claudiordgz Mar 26 '14 at 21:14
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We keep telling you to remove pragma man, I think this is the fourth time – Claudiordgz Mar 26 '14 at 21:14
I'll try removing the pragma, very doubtful though. – user3376098 Mar 26 '14 at 21:15
http://stackoverflow.com/questions/4357163/pragma-pack-wont-compile – Claudiordgz Mar 26 '14 at 21:16
pragma belongs to visual c++, you said you are using qt, you gotta know your environment mister doubtful – Claudiordgz Mar 26 '14 at 21:17
And it worked, thanks a bunch. pragma has always seemed like an obligatory thing to me. I guess it is, but only in visual studio. First time using Qt. – user3376098 Mar 26 '14 at 21:22
even when using visual studio pragma sucks... stick to project properties – Claudiordgz Mar 26 '14 at 21:23
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I think the problem has nothing to do with Winsock or Qt and everything to do with your lack of knowledge of how the c++ compiling and linking process occurs. I suggest finding some beginner tutorials that explain what happens and why you can't use VS static libraries when compiling with MinGW, and vice versa. – RobbieE Mar 26 '14 at 21:32
You're right, it was entirely because of my incompetence. – user3376098 Mar 26 '14 at 21:35
Ignorance is not the same as incompetence, ignorance can be fixed with education. – RobbieE Mar 26 '14 at 21:42

Linking winsock library with `LIBS += -lws2_32` in Qt doesn't work?

1 Answers1

Why are you passing the main window

to your WSAStartup??