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.
Related
I recently wanted to start learning assembly, but I have been having some problem setting up my project to build.
What I want to have is a C++ and assembly project, but it is currently not working. My assembly code shown below builds just fine:
ExitProcess PROTO
.data
.code
main proc
mov rax, 8
mov rcx, 0
call ExitProcess
main endp
end
but the moment I add a cpp file to my project I get a load of linker errors:
void ToDo()
{
int i = 0;
}
Errors:
1>------ Build started: Project: AssemblyTest, Configuration: Debug x64 ------
1> test.cpp
1>MSVCRTD.lib(_init_.obj) : error LNK2019: unresolved external symbol _CrtDbgReport referenced in function _CRT_RTC_INIT
1>MSVCRTD.lib(_init_.obj) : error LNK2019: unresolved external symbol _CrtDbgReportW referenced in function _CRT_RTC_INITW
1>MSVCRTD.lib(_error_.obj) : error LNK2019: unresolved external symbol __stdio_common_vsprintf_s referenced in function _vsprintf_s_l
1>MSVCRTD.lib(_error_.obj) : error LNK2001: unresolved external symbol __C_specific_handler
1>MSVCRTD.lib(_pdblkup_.obj) : error LNK2019: unresolved external symbol _wmakepath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath##YAHPEB_WPEA_W_K#Z)
1>MSVCRTD.lib(_pdblkup_.obj) : error LNK2019: unresolved external symbol _wsplitpath_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath##YAHPEB_WPEA_W_K#Z)
1>MSVCRTD.lib(_pdblkup_.obj) : error LNK2019: unresolved external symbol wcscpy_s referenced in function "int __cdecl GetPdbDllPathFromFilePath(wchar_t const *,wchar_t *,unsigned __int64)" (?GetPdbDllPathFromFilePath##YAHPEB_WPEA_W_K#Z)
1>MSVCRTD.lib(_pdblkup_.obj) : error LNK2019: unresolved external symbol __vcrt_GetModuleFileNameW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll##YAPEAUHINSTANCE__##XZ)
1>MSVCRTD.lib(_pdblkup_.obj) : error LNK2019: unresolved external symbol __vcrt_GetModuleHandleW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll##YAPEAUHINSTANCE__##XZ)
1>MSVCRTD.lib(_pdblkup_.obj) : error LNK2019: unresolved external symbol __vcrt_LoadLibraryExW referenced in function "struct HINSTANCE__ * __cdecl GetPdbDll(void)" (?GetPdbDll##YAPEAUHINSTANCE__##XZ)
1>C:\Users\***\Desktop\AssemblyTest\x64\Debug\AssemblyTest.exe : fatal error LNK1120: 10 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Does anybody know what is wrong with my setup and how to fix it?
You're linking your project with only part of the C runtime (CRT) libary, msvcrtd.lib. You also need to link with the libraries vcruntimed.lib and ucrtd.lib. The former is part of Visual Studio 2015 itself while the later is part of the Windows 10 SDK that was installed along Visual Studio. Normally C++ projects automatically link with these libraries, but apparently your project is setup not to.
You may be following instructions meant for an older version of Visual Studio which only required linking with one CRT library file. This changed due to a refactoring of the CRT with Visual Studio 2015.
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.
I get these errors when i try to put together a GLSL example program from a website, just so i can get a feel for shaders. I also get these exact same errors when i try to implement this shader in my own program.
http://www.swiftless.com/tutorials/glsl/1_setup.html#DL
>------ Build started: Project: TheLightingExperiment2, Configuration: Debug Win32 ------
1> main.cpp
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall Shader::init(char const *,char const *)" (?init#Shader##QAEXPBD0#Z) referenced in function "void __cdecl init(void)" (?init##YAXXZ)
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall Shader::unbind(void)" (?unbind#Shader##QAEXXZ) referenced in function "void __cdecl display(void)" (?display##YAXXZ)
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall Shader::bind(void)" (?bind#Shader##QAEXXZ) referenced in function "void __cdecl display(void)" (?display##YAXXZ)
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall Shader::Shader(void)" (??0Shader##QAE#XZ) referenced in function "void __cdecl `dynamic initializer for 'shader''(void)" (??__Eshader##YAXXZ)
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall Shader::~Shader(void)" (??1Shader##QAE#XZ) referenced in function "void __cdecl `dynamic atexit destructor for 'shader''(void)" (??__Fshader##YAXXZ)
1>C:\Users\Shawn\Desktop\TheLightingExperiment2\Debug\TheLightingExperiment2.exe : fatal error LNK1120: 5 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
These are undefined reference errors. from the Linker.You didn't attach the libraries. as you are in Visual Studio you can do this by right clicking on your Solution and thenby going to Properties.
It looks like you are missing libraries. Look into GLEW the GL Extension Wrangler and link that into your project. It is especially helpful with making shader extensions work.
GLEW Page
Since SCons has been deprecated. I used the gyp to generate vs solution.
I did what they told me on the build BuildingWithGYP.
And the v8 project builded ok!
and I got the v8_base.lib but no v8.lib.
And in the hello world project ,get started.I add the lib directory into the add library.
But it linked failed:
Linking...
1>v8test.obj : error LNK2019: unresolved external symbol "public:
__thiscall v8::HandleScope::~HandleScope(void)" (??
1HandleScope#v8##QAE#XZ) referenced in function _main
1>v8test.obj : error LNK2019: unresolved external symbol "public:
__thiscall v8::String::AsciiValue::~AsciiValue(void)" (??
1AsciiValue#String#v8##QAE#XZ) referenced in function _main
1>v8test.obj : error LNK2019: unresolved external symbol "public:
__thiscall v8::String::AsciiValue::AsciiValue(class v8::Handle<class
v8::Value>)" (??0AsciiValue#String#v8##QAE#V?$Handle#VValue#v8###2##Z)
referenced in function _main
1>v8test.obj : error LNK2019: unresolved external symbol "public:
class v8::Local<class v8::Value> __thiscall v8::Script::Run(void)" (?
Run#Script#v8##QAE?AV?$Local#VValue#v8###2#XZ) referenced in function
_main
……
It seems that couldn't find the implement
but i used the dumpbin tool and find the symbol i can find them in the v8_base.lib
I am sure that the library directory is ok!
but i don't know why it couldn't find the implement.
You can add the lib "v8_base.lib" as an additional dependency to fix the problem.
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.