Unresolved external symbols in Visual Studio 2010 - c++

I am coming from Xcode, trying to compile a project in Visual Studio 2010, and I get the following errors:
2>ofxCLeye.obj : error LNK2019: unresolved external symbol "struct _GUID __cdecl CLEyeGetCameraUUID(int)" (?CLEyeGetCameraUUID##YA?AU_GUID##H#Z) referenced in function "public: static int __cdecl ofxCLeye::listDevices(void)" (?listDevices#ofxCLeye##SAHXZ)
2>ofxCLeye.obj : error LNK2019: unresolved external symbol "int __cdecl CLEyeGetCameraCount(void)" (?CLEyeGetCameraCount##YAHXZ) referenced in function "public: static int __cdecl ofxCLeye::listDevices(void)" (?listDevices#ofxCLeye##SAHXZ)
2>ofxCLeye.obj : error LNK2019: unresolved external symbol "bool __cdecl CLEyeCameraGetFrameDimensions(void *,int &,int &)" (?CLEyeCameraGetFrameDimensions##YA_NPAXAAH1#Z) referenced in function "public: void __thiscall ofxCLeye::grabFrame(void)" (?grabFrame#ofxCLeye##QAEXXZ)
2>ofxCLeye.obj : error LNK2019: unresolved external symbol "bool __cdecl CLEyeCameraGetFrame(void *,unsigned char *,int)" (?CLEyeCameraGetFrame##YA_NPAXPAEH#Z) referenced in function "public: void __thiscall ofxCLeye::grabFrame(void)" (?grabFrame#ofxCLeye##QAEXXZ)
2>ofxCLeye.obj : error LNK2019: unresolved external symbol "bool __cdecl CLEyeDestroyCamera(void *)" (?CLEyeDestroyCamera##YA_NPAX#Z) referenced in function "public: virtual void __thiscall ofxCLeye::close(void)" (?close#ofxCLeye##UAEXXZ)
2>ofxCLeye.obj : error LNK2019: unresolved external symbol "bool __cdecl CLEyeCameraStop(void *)" (?CLEyeCameraStop##YA_NPAX#Z) referenced in function "public: virtual void __thiscall ofxCLeye::close(void)" (?close#ofxCLeye##UAEXXZ)
... etc etc...
2>bin\clEye_debug.exe : fatal error LNK1120: 10 unresolved externals
I imagine that the compiler is trying to link CLEyeMulticam.lib but not finding it. I think that I have configured it properly.
Could you point me with the needed steps to include a library in VS2010 ?
Thank you,
marc

Apologies if this is overly pedantic. If this is a pre-built library (not built as part of the project/solution) then make sure you
a) #include the correct header
b) #define any requisite macros
c) speciy additional .lib dependencies as shown below.
You will need to specify a fully qualifed path (d:\src\project\libs\camera.lib) unless the libary file is in the LIB environment variable.

In the Property Pages for your project, navigate to Configuration > Linker > Input and add the lib file to the Additional Dependencies setting. This applies to VC++ 2008, probably likewise to 2010.

Related

How to use lacewing project

I am a newbie to C++. I want to use, lacewing-project.org in my C++ project. I read the documentation on how to build it and successfully did it using both DLL - Release and Static Library - Release configurations.
Now I don't know how to use this in my project and how to setup and configure my project? I was following this tutorial, but was stuck in the middle because of missing options in the latest Visual Studio. I use Visual C++ Expression Ed., 2012 on Windows 8
I googled and did the following:
Added the lib file and the lacewing.h file in my project.
Under Visual C++ Project Properties, in the Linker folder -> Input I added the lib file as Additional Dependencies.
I placed the dll in Windows\System32 folder. Will I need to do anything with the dll other than placing it in win32 folder?
My code is from the hello world example given in the documentation.
When I try to compile I get:
1>------ Build started: Project: test, Configuration: Debug Win32 ------
1> Source.cpp
1>Source.obj : error LNK2019: unresolved external symbol __imp__lw_version referenced in function "void __cdecl on_get(struct lacewing::_webserver *,struct lacewing::_webserver_request *)" (?on_get##YAXPAU_webserver#lacewing##PAU_webserver_request#2##Z)
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl lacewing::pump_delete(struct lacewing::_pump *)" (__imp_?pump_delete#lacewing##YAXPAU_pump#1##Z) referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: struct lacewing::_error * __thiscall lacewing::_eventpump::start_eventloop(void)" (__imp_?start_eventloop#_eventpump#lacewing##QAEPAU_error#2#XZ) referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) struct lacewing::_eventpump * __cdecl lacewing::eventpump_new(void)" (__imp_?eventpump_new#lacewing##YAPAU_eventpump#1#XZ) referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl lacewing::_stream::writef(char const *,...)" (__imp_?writef#_stream#lacewing##QAAXPBDZZ) referenced in function "void __cdecl on_get(struct lacewing::_webserver *,struct lacewing::_webserver_request *)" (?on_get##YAXPAU_webserver#lacewing##PAU_webserver_request#2##Z)
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall lacewing::_webserver::host(long)" (__imp_?host#_webserver#lacewing##QAEXJ#Z) referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall lacewing::_webserver::on_get(void (__cdecl*)(struct lacewing::_webserver *,struct lacewing::_webserver_request *))" (__imp_?on_get#_webserver#lacewing##QAEXP6AXPAU12#PAU_webserver_request#2##Z#Z) referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) struct lacewing::_webserver * __cdecl lacewing::webserver_new(struct lacewing::_pump *)" (__imp_?webserver_new#lacewing##YAPAU_webserver#1#PAU_pump#1##Z) referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl lacewing::webserver_delete(struct lacewing::_webserver *)" (__imp_?webserver_delete#lacewing##YAXPAU_webserver#1##Z) referenced in function _main
1>C:\Users\Jayarathina\Desktop\New folder (3)\test\Debug\test.exe : fatal error LNK1120: 9 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Please help...
To link statically with the library, one must define lw_import. If you don't do this, it will default to __declspec(dllimport):
#ifndef lw_import
#define lw_import __declspec (dllimport)
#endif
which causes the linker to try and pull the functions in from a DLL (which is wrong when statically linking). To do this, you can either add lw_import= to your preprocessor definitions in the project properties, or #define it before including lacewing.h, as so:
#define lw_import
#include <lacewing.h>
As you're statically linking the library, you will also need to link any library dependencies into your own project. You can find the list in the project properties of liblacewing.vcproj itself, but as of 0.5.1 these are ws2_32.lib, mswsock.lib, mpr.lib, secur32.lib and crypt32.lib.

Abnormal unresolved external symbol error

I have a project that used to compile just fine, using the freetype library.
Since then my OS has been reinstalled and therefore so has Visual Studio 2010.
I have re-included and reinstalled all of the .lib .dll and header files. For some reason now if I run the program with the release configuration it runs just fine. But if I switch over to the debug config, it gives me unresolved external symbol errors from the linker, on the freetype library functions.
Now I'm sure my C++ directories for both configurations are identical as I re-set them using the all-configurations tab in the solution settings. As well as this, so are both configurations "additional directories/additional dependancies settings", set identically in the same way.
The only difference I could find between the release and debug folders in the project folder, is the presence of a file in the debug folder called "vc100.idb", which is a minimum rebuild dependancy file. This looked promising, but removing it yielded no results, so I put it back.
Do you have any ideas of what could be causing this difference between the configurations compiling?
Worst come to worst, I can continue programming on the release config, but I'd rather not continue down this road as I'd really like to know the root of this problem.
Thanks in advance,
Guy
The errors:
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Glyph_To_Bitmap referenced in function "void __cdecl freetype::make_dlist(struct FT_FaceRec_ *,char,unsigned int,unsigned int *)" (?make_dlist#freetype##YAXPAUFT_FaceRec_##DIPAI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Get_Glyph referenced in function "void __cdecl freetype::make_dlist(struct FT_FaceRec_ *,char,unsigned int,unsigned int *)" (?make_dlist#freetype##YAXPAUFT_FaceRec_##DIPAI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Load_Glyph referenced in function "void __cdecl freetype::make_dlist(struct FT_FaceRec_ *,char,unsigned int,unsigned int *)" (?make_dlist#freetype##YAXPAUFT_FaceRec_##DIPAI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Get_Char_Index referenced in function "void __cdecl freetype::make_dlist(struct FT_FaceRec_ *,char,unsigned int,unsigned int *)" (?make_dlist#freetype##YAXPAUFT_FaceRec_##DIPAI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Done_FreeType referenced in function "public: void __thiscall freetype::font_data::init(char const *,unsigned int)" (?init#font_data#freetype##QAEXPBDI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Done_Face referenced in function "public: void __thiscall freetype::font_data::init(char const *,unsigned int)" (?init#font_data#freetype##QAEXPBDI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Set_Char_Size referenced in function "public: void __thiscall freetype::font_data::init(char const *,unsigned int)" (?init#font_data#freetype##QAEXPBDI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_New_Face referenced in function "public: void __thiscall freetype::font_data::init(char const *,unsigned int)" (?init#font_data#freetype##QAEXPBDI#Z)
1>freetype.obj : error LNK2019: unresolved external symbol _FT_Init_FreeType referenced in function "public: void __thiscall freetype::font_data::init(char const *,unsigned int)" (?init#font_data#freetype##QAEXPBDI#Z)
Edit: OK well this is strange. I've removed ALL of the freetype directory information rom the include and library directory setting in the release config, as well as the additional dependancies. And the released config version still works!
This is leading me to believe there is something missing (vs config-wise) from moving my files over.
I had the same problem.
I solved it by compiling the freetype( freetype-2.5.2\builds\windows\vc2010\freetype.sln ) solution for the x64 platform (or win32 if you use it).
You will get the .libs for this platform.

Error when building a project in VC++ 2010 Express [duplicate]

This question already has answers here:
Linker error LNK2019 from 3rd party library
(3 answers)
Closed 10 years ago.
I tried to see what is the problem(s) related to those error messages. I tried to check everything but still, I'm not finding the source of the error.
According to you, the obj error followed by error LNK2019: unresolved external symbol imp__is_CaptureVideo referenced in function, what is its provenance?
I'm using Visual Express C++ 2010.
Thank you.
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_CaptureVideo referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnButtonStart(void)" (?OnButtonStart#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_StopLiveVideo referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnButtonStop(void)" (?OnButtonStop#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_SetImageMem referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnBnClickedButtonLoadParameter(void)" (?OnBnClickedButtonLoadParameter#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_AllocImageMem referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnBnClickedButtonLoadParameter(void)" (?OnBnClickedButtonLoadParameter#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_SetColorMode referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnBnClickedButtonLoadParameter(void)" (?OnBnClickedButtonLoadParameter#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_AOI referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnBnClickedButtonLoadParameter(void)" (?OnBnClickedButtonLoadParameter#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_FreeImageMem referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnBnClickedButtonLoadParameter(void)" (?OnBnClickedButtonLoadParameter#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_ParameterSet referenced in function "private: void __thiscall CIdsSimpleLiveDlg::OnBnClickedButtonLoadParameter(void)" (?OnBnClickedButtonLoadParameter#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_EnableMessage referenced in function "private: bool __thiscall CIdsSimpleLiveDlg::OpenCamera(void)" (?OpenCamera#CIdsSimpleLiveDlg##AAE_NXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_GetSensorInfo referenced in function "private: bool __thiscall CIdsSimpleLiveDlg::OpenCamera(void)" (?OpenCamera#CIdsSimpleLiveDlg##AAE_NXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_RenderBitmap referenced in function "private: long __thiscall CIdsSimpleLiveDlg::OnUEyeMessage(unsigned int,long)" (?OnUEyeMessage#CIdsSimpleLiveDlg##AAEJIJ#Z)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_ExitCamera referenced in function "private: void __thiscall CIdsSimpleLiveDlg::ExitCamera(void)" (?ExitCamera#CIdsSimpleLiveDlg##AAEXXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_GetColorDepth referenced in function "private: int __thiscall CIdsSimpleLiveDlg::InitDisplayMode(void)" (?InitDisplayMode#CIdsSimpleLiveDlg##AAEHXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_SetDisplayMode referenced in function "private: int __thiscall CIdsSimpleLiveDlg::InitDisplayMode(void)" (?InitDisplayMode#CIdsSimpleLiveDlg##AAEHXZ)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_GetDuration referenced in function "private: int __thiscall CIdsSimpleLiveDlg::InitCamera(unsigned long *,struct HWND__ *)" (?InitCamera#CIdsSimpleLiveDlg##AAEHPAKPAUHWND__###Z)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_InitCamera referenced in function "private: int __thiscall CIdsSimpleLiveDlg::InitCamera(unsigned long *,struct HWND__ *)" (?InitCamera#CIdsSimpleLiveDlg##AAEHPAKPAUHWND__###Z)
1>IdsSimpleLiveDlg.obj : error LNK2019: unresolved external symbol __imp__is_ImageFormat referenced in function "private: void __thiscall CIdsSimpleLiveDlg::GetMaxImageSize(int *,int *)" (?GetMaxImageSize#CIdsSimpleLiveDlg##AAEXPAH0#Z)
1>nafxcwd.lib(appcore.obj) : error LNK2001: unresolved external symbol ___argv
1>nafxcwd.lib(appcore.obj) : error LNK2001: unresolved external symbol ___argc
1>C:\Program Files\IDS\uEye\Develop\Source\SimpleLive\Debug\po.exe : fatal error LNK1120: 19 unresolved externals
I have added the correspondent library by clicking on the properties
of my project and then, adding the directory to the Library Directories
It seems like you've added the 'Additional Library Directory' to your VS Project - but didn't link the actual library file (windows extension: .lib). I think what you did is
Project Properties -> Configuration Properties-> Linker -> General -> Additional Library Directories
and added the directoy where your 3rd party '.lib' is inside. But in fact this doesn't link against that '.lib' file by itself (it just added the directory where VS is searching for the linked .lib files).
Try the following:
Right click on your project -> Project Properties -> Configuration Properties-> Linker -> Input -> Additional Dependencies
There is a list like:
'kernel32.lib;user32.lib;...;%(AdditionalDependencies)'
And somewehere inside there should the name of your '.lib file' appear. If it doesn't, you've to add it there. I.e. if the lib of your 3rd party library is named 'myLib.lib' you would insert there instead
'kernel32.lib;user32.lib;...;myLib.lib;%(AdditionalDependencies)'

How do I solve "unresolved external symbol" errors in a DirectX 11 program?

I am working on a DirectX 11 project for school and I followed the book thoroughly when doing this. I keep thinking that maybe something is labeled wrong but I double checked all my files, all my class names are fine (I believe they are fine) and double checked how all my header files are setup and everything should be okay and I still get this error output:
1>BlankDemo.obj : error LNK2019: unresolved external symbol "public: __thiscall DemoBase::DemoBase(void)" (??0DemoBase##QAE#XZ) referenced in function "public: __thiscall BlankDemo::BlankDemo(void)" (??0BlankDemo##QAE#XZ)
1>BlankDemo.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall DemoBase::~DemoBase(void)" (??1DemoBase##UAE#XZ) referenced in function "public: virtual __thiscall BlankDemo::~BlankDemo(void)" (??1BlankDemo##UAE#XZ)
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall DemoBase::Shutdown(void)" (?Shutdown#DemoBase##QAEXXZ) referenced in function _wWinMain#16
1>main.obj : error LNK2019: unresolved external symbol "public: bool __thiscall DemoBase::Initialize(struct HINSTANCE__ *,struct HWND__ *)" (?Initialize#DemoBase##QAE_NPAUHINSTANCE__##PAUHWND__###Z) referenced in function _wWinMain#16
1>C:\Users\vaughn\documents\visual studio 2010\Projects\BlankWindow\Debug\BlankWindow.exe : fatal error LNK1120: 4 unresolved externals
How do I solve this?
Evidently, you either haven't implemented a handful of methods from the DemoBase class (including its constructor and destructor), or you haven't included the implementation file in the list of files to compile or link with your program. Implement them, and then make sure you've included the source file in your project.

error LNK2019: unresolved external symbol "public:

I am creating an torrent application using libtorrent in VS 2008. I tried the example given in the link http://www.rasterbar.com/products/libtorrent/examples.html
BUt it is showing me these error....how to solve them?
Linking...
main.obj : error LNK2019: unresolved external symbol "public: __thiscall libtorrent::torrent_info::~torrent_info(void)" (??1torrent_info#libtorrent##QAE#XZ) referenced in function _main
main.obj : error LNK2019: unresolved external symbol "public: __thiscall libtorrent::torrent_info::torrent_info(struct libtorrent::lazy_entry const &)" (??0torrent_info#libtorrent##QAE#ABUlazy_entry#1##Z) referenced in function _main
main.obj : error LNK2019: unresolved external symbol "class std::basic_ostream > & __cdecl libtorrent::operator<<(class std::basic_ostream > &,struct libtorrent::lazy_entry const &)" (??6libtorrent##YAAAV?$basic_ostream#DU?$char_traits#D#std###std##AAV12#ABUlazy_entry#0##Z) referenced in function _main
main.obj : error LNK2019: unresolved external symbol "int __cdecl libtorrent::lazy_bdecode(char const *,char const *,struct libtorrent::lazy_entry &,int)" (?lazy_bdecode#libtorrent##YAHPBD0AAUlazy_entry#1#H#Z) referenced in function _main
main.obj : error LNK2019: unresolved external symbol "public: void __thiscall libtorrent::lazy_entry::clear(void)" (?clear#lazy_entry#libtorrent##QAEXXZ) referenced in function "public: __thiscall libtorrent::lazy_entry::~lazy_entry(void)" (??1lazy_entry#libtorrent##QAE#XZ)
main.obj : error LNK2019: unresolved external symbol "void __cdecl libtorrent::to_hex(char const *,int,char *)" (?to_hex#libtorrent##YAXPBDHPAD#Z) referenced in function "class std::basic_ostream > & __cdecl libtorrent::operator<<(class std::basic_ostream > &,class libtorrent::big_number const &)" (??6libtorrent##YAAAV?$basic_ostream#DU?$char_traits#D#std###std##AAV12#ABVbig_number#0##Z)
main.obj : error LNK2019: unresolved external symbol "public: struct libtorrent::peer_request __thiscall libtorrent::file_storage::map_file(int,__int64,int)const " (?map_file#file_storage#libtorrent##QBE?AUpeer_request#2#H_JH#Z) referenced in function "public: struct libtorrent::peer_request __thiscall libtorrent::torrent_info::map_file(int,__int64,int)const " (?map_file#torrent_info#libtorrent##QBE?AUpeer_request#2#H_JH#Z)
C:\Users\photoshop3\Documents\Visual Studio 2008\Projects\Lib2\Debug\Lib2.exe : fatal error LNK1120: 7 unresolved externals
The .lib is not included in your project. Make sure you are linking it in;
Configuration Properties -> Linker -> Input -> Additional Dependencies
Another altnerative is to simply copy the .lib to your project folder but don't, it's bound to create problems later on.
Sometimes the .lib is not shipped with the library, so you need to compile it yourself.
The README will tell you this. If this is the case, they usually ship with a .sln file you can open and the just compile it into a .lib file which you then reference in your main application, as I wrote above
Have you added the path of header files in the "Configuration Properties" --> "C/C++“ --> "General" --> "Additional Include Directories"?
The link gives you only the sources (including headerfiles) of libtorrent. You should compile this sources to get a .lib file. Add this .lib file to your client:
Configuration Properties/Linker/Input -> Additional Dependencies: libtorrent-rasterbar.lib
The best starting point for compiling should be the README file.
public: isn't the unresolved symbol. It's just there because the linker it trying to tell you that (most) of the unresolved symbols are public member functions.
It looks like you've included the header for "libtorrent", but not linked to the "libtorrent" library.
You have probably not linked with the torrent library or specified the wrong path to it so that the linker cannot find it.
If the input libraries are of 32bit and your are using them in building a 64bit it might be one of the reasons
For me, I had it included in my project, but it turned out that it was a plugin that was designed to not create an instance of in my unit test.