I'm making a program using the glu library but when i compile i got this error:
1>opengl_3.obj : error LNK2019: unresolved external symbol _gluLookAt#72 referenced in function "public: void __thiscall OpenGLContext::setupScene(void)" (?setupScene#OpenGLContext##QAEXXZ)
I included GL/glu.h and checked if the lib and dll were present. (they are by default)
I'm using visual studio 2012.
Any idea where this error is coming from?
You are not linking to glu. Add glu to the libraries against which your program should be linked. A more detailed description can be found here.
Related
I'm trying to use the mysql.h library to connect to my database using c++. I included the library in the additional libraries proprierty, however, when I'm trying to run the program, I get the following error:
Error LNK2019 unresolved external symbol _mysql_init#4 referenced in function "private: static bool __cdecl AlarmHandler::pushAlarmToActiveAlarmDB(class std::shared_ptr)" (?pushAlarmToActiveAlarmDB#AlarmHandler##CA_NV?$shared_ptr#VAlarm###std###Z) Proiect Colectiv C:\Users\docto\source\repos\Proiect Colectiv\Proiect Colectiv\AlarmHandler.obj 1
For some reason, it might not be building the included library? If so, how can I fix that? Thanks!
Using this manual, I tried to get freeglut OpenGL application to compile on my computer. This means I:
Copied files from freeglut archive to MS program files folder
Specified freeglut.lib in additional dependencies
Set explicitly the freeglut.lib path in libraries folders
But all takes no effect. The C++ header files are found right, but the libraries not - so I get these errors:
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp__glutMainLoop#0 referenced in function _wmain
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp__glutSpecialFunc#4 referenced in function _wmain
1>OpenglTest.obj : error LNK2019: unresolved external symbol "void __cdecl specialKeys(int,int,int)" (?specialKeys##YAXHHH#Z) referenced in function _wmain
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp__glutDisplayFunc#4 referenced in function _wmain
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp__glutInitDisplayMode#4 referenced in function _wmain
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp____glutInitWithExit#12 referenced in function _glutInit_ATEXIT_HACK#8
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp____glutCreateWindowWithExit#8 referenced in function _glutCreateWindow_ATEXIT_HACK#4
1>OpenglTest.obj : error LNK2019: unresolved external symbol __imp__glutSwapBuffers#0 referenced in function "void __cdecl display(void)" (?display##YAXXZ)
So my questions:
Could you guess what may be wrong? (not easy, but I cannot find this out obviously)
Is there some other manual google didn't find, but better than the one I used?
Is there some other archive I should download?
My C++ code comes from here. All functions are well found in freeglut header files. Just the libraries are missing.
This seems like a C vs C++ linkage issue. You are compiling a C source code from there as a C++ code (maybe you saved it with C++ specific extensions and the compiler assumed it is C++).
C++ will mangle function names. For example __imp__glutMainLoop#0 is most probabley a call to glutMainLoop in your source code.
The library must have been from a C code. Hence it will have a non mangled version of the function simply as glutMainLoop. That's why it can not be found.
The solution is either compile your code as C code or use extern "C".
EDIT: Some Links on how to deal with with C/C++ linkage issues (Moved from the comments).
http://www.thegeekstuff.com/2013/01/mix-c-and-cpp/
Combining C++ and C - how does #ifdef __cplusplus work?
http://www.parashift.com/c++-faq-lite/c-calls-cpp.html
I am trying to build an OpenCV program which uses SURF matching algorithm, the code is in the following link :
http://feelmare.blogspot.ro/2011/10/sift-matching-c-source-code-using.html
However, I am obtaining 2 errors regarding some external symbols : _cvExtractSurf and _cvSURFParams.
error LNK2019: unresolved external symbol _cvExtractSURF referenced in function "public: bool __thiscall CMareMatchingClass::ExtractBGsurf(struct _IplImage *)" (?ExtractBGsurf#CMareMatchingClass##QAE_NPAU_IplImage###Z)
error LNK2019: unresolved external symbol _cvSURFParams referenced in function "public: __thiscall CMareMatchingClass::CMareMatchingClass(void)" (??0CMareMatchingClass##QAE#XZ)
Do you know how can I solve this errors? I am running the code by using opencv 2.3.0 in visual studio 2010 in Windows 7 - 64 bit.
You didn't link a needed library - try to link all OpenCV libraries in project settings. See documentation.
I am getting the following LINK error while compiling my C++ solution:
error LNK2019: unresolved external symbol _Direct3DCreate9Ex#8
referenced in function "protected: XYX()
The symbol "Direct3DCreate9Ex' is defined in "ddraw.h" header file found in "C:\Program Files\Microsoft SDKs\Windows\v7.0\Include". And verified that the header file "ddraw.h" is present in this location. Also I have included this path in VS settings "Tools-->Options-->VC++ Directories -> Includes".
But still I am getting the link error as "error LNK2019: unresolved external symbol _Direct3DCreate9Ex#8 referenced in function "protected: XYX()" ".
Can anyone kindly help me in getting rid of this link error while compiling my C++ solution.
I am using VS 2008 on 64 bit Win7.
Thanks in advance.
Based on reference page for Direct3DCreate9Ex you need to link with D3D9.lib.
We use Lua (www.lua.org) script to let users to customize our server software written in C++.
At the moment we are porting the 32 bits Windows version of our project to Visual Studio 2010.
Once everything works fine with VS 2008, we thought that we would have no problem on upgrade process.
Unfortunately whenever we tried to link the lualib (as dll) to our project in VS 2010, the lua functions could not be found by the linker (the error messages are displayed below).
It seems that some calling convention is wrong on 2010, like the application may be looking for the lua functions with a prefix '_'.
To access lua functions (written in C) from our project modules (C++) we use this:
extern "C" {
#include "lua/src/lua.h"
#include "lua/src/lualib.h"
#include "lua/src/lauxlib.h"
}
The same project compiles and links with lualib successfully on VS 2008 and Linux (g++).
Could anybody help me with this ?
1>dscscript.obj : error LNK2019: unresolved external symbol __imp__luaL_openlibs referenced in function "public: int __thiscall DsCScriptEngine::Init(void)" (?Init#DsCScriptEngine##QAEHXZ)
1>dscscript.obj : error LNK2019: unresolved external symbol __imp__luaL_newstate referenced in function "public: int __thiscall DsCScriptEngine::Init(void)" (?Init#DsCScriptEngine##QAEHXZ)
1>dscscript.obj : error LNK2019: unresolved external symbol __imp__lua_close referenced in function "public: void __thiscall DsCScriptEngine::Shutdown(void)" (?Shutdown#DsCScriptEngine##QAEXXZ)
1>dscscript.obj : error LNK2019: unresolved external symbol __imp__lua_pcall referenced in function "public: long __thiscall DsCScriptEngine::Execute(char const *)" (?Execute#DsCScriptEngine##QAEJPBD#Z)
etc.
The reported missing names are correct, this not a compile problem. You must be linking the wrong .lib. The name you use sounds wrong, it isn't "lualib", the current version of the import library is named lua5.1.lib (or lua51.lib, not sure what the difference is). Download it from here.