C++ game. Error code when compiling. Error LNK2019

Question

Okay.. This may be a stupid question. I just followed a tutorial on how to make a game engine. I have been fighting my way through several errors, and i finally think i'm getting into the last errors. So here is my errors:

Error 1 error LNK2019: unresolved external symbol _imp_MessageBoxA@16 referenced in function __catch$_wWinMain@16$0

Error 2 error LNK2019: unresolved external symbol "public: __thiscall Engine::Engine(void)" (??0Engine@@QAE@XZ) referenced in function _wWinMain@16

Error 3 error LNK2019: unresolved external symbol "public: void __thiscall Engine::Go(void)" (?Go@Engine@@QAEXXZ) referenced in function _wWinMain@16

Error 4 error LNK1120: 3 unresolved externals

Code:

#include <Windows.h>
#include "Engine.h"

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
{
    Engine* engine = new Engine();

    try
    {
        engine->Go();
    }
    catch(char* e)
    {
        MessageBoxA(NULL, e, "Exception Occured", MB_OK | MB_ICONERROR);
    }
}

So i kinda guessed that it is the wWinMain thing, i have made.But what the problem is, is unclear to me.

Thanks in advance.

It must be very bad tutorial if it throws char* as exception... — nogard, May 15 '13 at 13:31
http://www.dreamincode.net/forums/topic/230524-c-tile-engine-from-scratch-part-1/ — mads232, May 15 '13 at 13:33

score 3 · Accepted Answer · answered May 15 '13 at 13:40

3

error LNK2019: unresolved external symbol __imp__MessageBoxA@16 referenced in function __catch$_wWinMain@16$0

This error indicates you need to link your project against user32.lib.

error LNK2019: unresolved external symbol "public: __thiscall Engine::Engine(void)" (??0Engine@@QAE@XZ) referenced in function _wWinMain@16
error LNK2019: unresolved external symbol "public: void __thiscall Engine::Go(void)" (?Go@Engine@@QAEXXZ) referenced in function _wWinMain@16

These errors indicate you need to compile and link Engine.cpp into your project.

answered May 15 '13 at 13:40

Oktalist

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Thanks. Can you please describe how to link to the user32.lib? And should i do: "#include "Engine.cpp"? – mads232 May 15 '13 at 13:43
@user2007556 http://bit.ly/19sKOgF – Oktalist May 15 '13 at 13:46
No, do not `#include` Engine.cpp. Just add it to your project's Source Files. – Oktalist May 15 '13 at 13:47
Bam! I got the user32.lib added. Sorry for asking about that. I was just lazy, i guess. Wait a second. I'm going to try the Engine.cpp now. – mads232 May 15 '13 at 13:48
http://gyazo.com/8877e16c70c4e8ae8c98ca6c2701e36d It should work? – mads232 May 15 '13 at 13:49
It couldn't be a wrong installation of SFML? – mads232 May 15 '13 at 13:53
@user2007556 You still get only the same two errors? – Oktalist May 15 '13 at 13:54
Yeah. The first error is gone, because i added the user32.lib. – mads232 May 15 '13 at 13:55
http://gyazo.com/24aa27b51a552c102efaa42829c1537a Here is a picture of the project. – mads232 May 15 '13 at 13:59
@user2007556 Show Engine.cpp. – Oktalist May 15 '13 at 14:00
http://gyazo.com/eea27c15fdc9f242c39a79ae0c798368 – mads232 May 15 '13 at 14:01
@user2007556 No, that's Engine.h. Or at least, that's what Engine.h should look like. Engine.cpp should look different. Refer to the tutorial. – Oktalist May 15 '13 at 14:01
Wait. I may have copied something. Stupid me! Let me change it. – mads232 May 15 '13 at 14:03
http://gyazo.com/ee87cff4a87994b326645dc0883ab496 It removed the errors, and gave me new ones. – mads232 May 15 '13 at 14:05
I may know how to resolve these. I really don't want to bother you with it. Thanks for all your helpful answers! – mads232 May 15 '13 at 14:06

C++ game. Error code when compiling. Error LNK2019

1 Answers1