Unresolved External Symbol ERROR
Sometimes the error of format:
DTrack.obj : error LNK2019: unresolved external symbol _gethostbyname@4 referenced in function "unsigned int __cdecl ip_name2ip(char const *)" (?ip_name2ip@@YAIPBD@Z) 1>istest_haplo.obj : error LNK2001: unresolved external symbol _gethostbyname@4
can be solved by linking Ws2_32.lib to the Project Properties->Linker-> Input-> Additional Dependencies.
GLUT
- Download GLUT from Nate Robin’s Site
- Put
- glut.h to C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include
- glut32.lib to C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Lib
- glut32.dll to C:\Windows\System32\ or C:\Windows\SysWOW64
- And, we are done
Linking to OpenGL libraries
When you have created an Empty project in VS 2008, add a new c++ source file (.cpp).
- Open Project properties
- Configuration Properties -> Linker -> Input
- Select Configuration Drop-down box
- Select All Configurations
- It changes settings for both Debug and Release configurations
- In the Additional Dependencies box, add opengl32.lib glu32.lib
- Click OK
‘exit’ redefinition error in OpenGL
An opengl error that shows up mostly in VS 2003 and VS 2005:
microsoft visual studio 8\vc\include\stdlib.h(433) : error C2381: 'exit' :
redefinition; __declspec(noreturn) differs \includes\gl\glut.h(146) :
see declaration of 'exit'
This error is caused by including glut.h before stdlib.h. So just by reversing the order of inclusion we can remove this error:
#include <GL/glut.h>
#include <stdlib.h>
to
#include <stdlib.h>
#include <GL/glut.h>