I'm using Visual Studio 2010 on a 64-bit Windows 7 machine. I've pulled v8 source from SVN, built it with no problems (wich arch=x64), but I still can't compile my project that tries to use v8.
Here is a sample code that produces that same error :
#include <v8.h>
int main(int argc, char *argv[])
{
v8::Handle<v8::Context> context = v8::Context::New();
return 0;
}
The linker error I get is :
v8test.obj : error LNK2019: unresolved external symbol "public: static class v8::Persistent<class v8::Context> __cdecl v8::Context::New(class v8::ExtensionConfiguration *,class v8::Handle<class v8::ObjectTemplate>,class v8::Handle<class v8::Value>)" (?New#Context#v8##SA?AV?$Persistent#VContext#v8###2#PAVExtensionConfiguration#2#V?$Handle#VObjectTemplate#v8###2#V?$Handle#VValue#v8###2##Z) referenced in function _main
I built v8 as a static lib, tried both debug and release build, I get the same error.
In addition to v8_base.lib you need to also include v8_snapshot.lib, ws2_32.lib, and winmm.lib.
The sample on the V8 Getting Started Page can be compiled in a Console Application with following dependencies listed under Project Properties->Configuration Properties->Linker->Input->Additional Dependencies:
v8_base.lib;v8_snapshot.lib;ws2_32.lib;winmm.lib;(AdditionalDependencies)
Related
I'm trying to do my first step with CNG (Cryptography Next Generation) in VC++ 2015 (Windows 10 x64). Here's the code:
#include "stdafx.h"
#include <windows.h>
int main()
{
NTSTATUS status;
ULONG cbBufSize = 0;
PCRYPT_PROVIDERS pBuf = NULL;
status = BCryptEnumRegisteredProviders(&cbBufSize, &pBuf);
return 0;
}
Building the project (for x86), I got an error message:
Error LNK2019 unresolved external symbol
_BCryptEnumRegisteredProviders#8 referenced in function _main
I then tried to install "CNG Software Development Kit" and configured the project following this instruction: http://www.codeproject.com/Articles/18713/Simple-way-to-crypt-a-file-with-CNG
but project building gave the same error message.
Please help!
PS: I did the same thing in (Win7 x86, VS 2008) and it worked without any error.
I just started this simple Quantlib date class in VC++ Express 2010:
#include <iostream>
#include <sstream>
#include "ql/time/date.hpp"
int main(int, char* [])
{
QuantLib::Date d(1, QuantLib::January, 2010);
std::cout<<da<<std::endl;
}
When I compiled it, this is one of the errors:
1>ql_inout.obj : error LNK2019: unresolved external symbol "public: __thiscall QuantLib::Date::Date(int,enum QuantLib::Month,int)" (??0Date#QuantLib##QAE#HW4Month#1#H#Z) referenced in function _main
It must be something I didn't setup correctly in 2010 project. I have compiled the library in Debug mode successfully.
Not all headers include the pragma that tells the linker to add QuantLib. If you don't want to include the full headers—which is advisable, as they would increase a lot your compilation time—you can add
#include <ql/auto_link.hpp>
to the included headers.
(You could also add the library explicitly to the linker options, but that is a lot more work since you have to specify different library names depending on the configuration. auto_link.hpp does this for you.)
Downloadable address of full source code:
http://cfile209.uf.daum.net/attach/267EAF4B5215CFDD0D951E
Hi. I am trying to create a console application which use a function coded in a lib file, which also call functions in a dll file. (console -> lib -> dll)
Dll file is QT Gui implementation.
Lib file loads things from DLL using QLibrary.
Those lib and dll library are compiled on QT Creator via .pro file. (QT version is latest 5)
The Main console applications uses those two lib and dll is created on MSVS 2008.
Here I got an error when I compile it on MSVS 2008:
1>main.obj : error LNK2019: unresolved external symbol "int __cdecl CreateQt(int,char * * const)" (?CreateQt##YAHHQAPAD#Z) referenced in function _main
I put lib and dll into Console application's folder, it seem like I get an linking error, any help?
Thank you
Here is my console application source code.
#include "main.h"
#pragma comment(lib,"./main.lib") //main.lib is library created on QT Creator
int main(int argc, char *argv[])
{
CreateQt(argc,argv);
return 0;
}
Do you have
TEMPLATE = lib
In your lib's pro file?
In your console's pro file do you have something like
LIBS += -L../folder/path/to/libfile -lLibFileNameWithoutDotLib
It seems like you're not linking the lib file in your console app correctly. I assume that CreateQt is a function you have in your lib code.
This is my code in Visual Studio C++
#include "stdafx.h"
#include<opencv\cv.h>
#include<opencv\highgui.h>
using namespace cv;
int main(int argc, char** argv[]) {
IplImage* img = cvLoadImage("logo.jpg");
cvNamedWindow("Test", CV_WINDOW_AUTOSIZE);
cvShowImage("Test", img);
cvWaitKey(0);
cvReleaseImage(&img);
cvDestroyWindow("Test");
return 0;
}
I am using OpenCV 2.4.6 and Visual Studio 2010. This is the error:
openCV_testing.obj : error LNK2019: unresolved external symbol _cvDestroyWindow
referenced in function _main
openCV_testing.obj : error LNK2019: unresolved external symbol _cvReleaseImage
referenced in function _main
openCV_testing.obj : error LNK2019: unresolved external symbol _cvWaitKey referenced in
function _main
openCV_testing.obj : error LNK2019: unresolved external symbol _cvShowImage referenced
in function _main
openCV_testing.obj : error LNK2019: unresolved external symbol _cvNamedWindow
referenced in function _main
openCV_testing.obj : error LNK2019: unresolved external symbol _cvLoadImage referenced
in function _main
Please help.
'unresolved external symbol' means that you're not linking with required library.
Go to Properties -> Linker -> Additional Library dependencies and add path to OpenCV libs.
First check
How to build applications with OpenCV inside the Microsoft Visual Studio
If you still suffer from the same problem, you could be under one of the below cases.
Your active solution platform is x86 but you are trying to link x64 OpenCV libraries.
Your active solution platform is X64 but you are trying to link x86 OpenCV libraries.
If you are under one of these cases, check
Compiling a 64-bit Application in Microsoft Visual Studio Express 2010
Add these into your code:
#pragma comment (lib, "opencv_core248d.lib")
#pragma comment (lib, "opencv_highgui248d.lib")
#pragma comment (lib, "opencv_imgproc248d.lib")
#pragma comment (lib, "opencv_video248d.lib")
#pragma comment (lib, "opencv_features2d248d.lib")
It worked for me.
i searched a lot for the same problem this was the best solution i had found and it worked for me.
Open Configuration Properties > C/C++ > General, and edit the field Additional Include Directories to add these 3 paths (for the headers):
C:\OpenCV2.3\build\include\opencv
C:\OpenCV2.3\build\include\opencv2
C:\OpenCV2.3\build\include
I know this is not about the OpenCV library, but I already had a problem importing Tiny-Process library. My .lib file was linked correctly in Configuration Properties -> Linker -> Additional Library dependencies and the Additionnal Include Directories were correctly added but the the functions definition (s) were still not found and I was getting the LNK2019 error.
To fix the issue, I had to go in the library project properties, change the Character Set property in Configuration Properties -> Advanced Character Set and change the value Use Multi-Byte Character Set to Use Unicode Character Set.
After recompiling the library and using the new .lib file, it was working.
Argh... I've been struggling lately to make Visual Studio 2010 (VC++) include a bunch of 3rd party libraries I wanna use in my project. That's the issue: The linker seems not to be able to determine every symbol that is generated in my code which come from the 3rd party libraries definitions. I've included the header files path on my include directories and also the sources path on my source directory, but it is still not working. I've googled it for a while and in most of cases, the issues is cause by a missing reference of the .lib file on linker's additional dependencies, however the library don't come with them.
Here's a piece of sample code:
#include "stdafx.h"
#include <fuzzylite\FuzzyEngine.h>
int _tmain(int argc, _TCHAR* argv[])
{
fl::FuzzyEngine eng;
return 0;
}
So that's the output VS shows
Fuzzycolors.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall fl::FuzzyEngine::~FuzzyEngine(void)" (??1FuzzyEngine#fl##UAE#XZ) referenced in function _wmain
Fuzzycolors.obj : error LNK2019: unresolved external symbol "public: __thiscall fl::FuzzyEngine::FuzzyEngine(void)" (??0FuzzyEngine#fl##QAE#XZ) referenced in function _wmain
So i wonder if is there a way to build my sources with the .h and .cpp files of my 3rd party library.
Thank you.
Caio
Check the new version of fuzzylite-2.0 at http://www.fuzzylite.com. That problem has been solved.
Windows requires to add __declspec(dllexport) to classes, which was not present in previous versions. Today, every class starts with class FL_EXPORT Engine, where FL_EXPORT is the missing definition.