I've been trying to get to get a basic v8 program working under visual studio 2010. I've been able to build v8.lib and v8.dll with no problems. I placed the .v8.dll in my debug folder, and added the v8.lib to VC lib folder.
I added v8.lib to my list of additional dependencies, but when I try and build anything using v8 code, I get a series of "error LNK2001: unresolved external symbol" errors such as "Error 13 error LNK2001: unresolved external symbol _imp_EncodePointer#4 C:\KHMP\Game_Cpp\KHMPCpp\KHMPCpp\MSVCRTD.lib(atonexit.obj)"
I'm not sure what library I'm missing. V8 is definitely being linked as if I remove it from Additional Dependencies, the number of errors increases. I found something about needing to use ws2_32.lib, but including that in with my additional dependencies did not fix the problem.
Does anyone have any idea what libraries I might be missing/what I might be doing wrong?
You are missing the kernel32.lib dependency. Getting it from a file named MSVCRTD.lib is very fishy, that's the import library for the CRT. Do make sure that whatever 'framework' you are using isn't trying to replace it. And make very sure that you haven't been copying .lib files to try to solve another linker problem. Like copying libcmtd.lib to msvcrtd.lib, that's guaranteed runtime trouble too.
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Some back story: I am trying to get the bolt-lmm software to compile on a Windows machine, because it would be a nice addition to the research group I am in. The developers of the software have only made a linux static executeable, but made the source code available. I am used to programming in R or python, and this is my first ever encounter with C++.
I have solved a fair bit of problems, but for some reason I have not been able to get visual studio to link properly with Nlopt-2.4.2.
I downloaded it
and followed the steps given there on how to install it.
I can tell I have done the same to link the Nlopt library to the project as is described in How to add additional libraries to Visual Studio project?
I still get errors like:
Error LNK2019 unresolved external symbol __imp__nlopt_create referenced in function "public: __thiscall nlopt::opt::opt(enum nlopt::algorithm,unsigned int)" (??0opt#nlopt##QAE#W4algorithm#1#I#Z) boltCompiler C:\Users\au483192\source\repos\boltCompiled\boltCompiler\NonlinearOptMulti.obj 1
(there are a total of 12 of this type of error, and an error link 1120, which just tells me there are 12 unresolved eternals.)
I hope this is enough information to provide a hint of what is going wrong.
I did some more digging, and it seems the linker needed more than just the folder for the .lib file.
This post sums it up:
Linking a static library to my project on Visual Studio 2010
Essentially you just need to tell the linker the placement of the lib and the actual name of the .lib file.
Hopefully this will help others who forgot/did not know that added library names manually could be needed for some libraries.
TL;DR:
open configuration properties for the project > linker > general
Then add the path to the .lib file in the "addition library directories" line
Then (still in configuration properties) go to linker > input
add the .lib file name to the "addition dependencies" line, e.g. libnlopt-0.lib (don't forget to separate with ";")
I've already looked for solution, without a success.
I need to use a DLL supplied by third parties on Visual Studio 2013(running on (x64) Windows 10).
On machine there are both OpenCV 3.0.0 and OpenCV2.410 installed and working.
The DLL's author has provided a .lib file and He says that in order to use this DLLs in your project, you need to put some others OpenCV's dlls in the project folder( I've tried to put these DLLs in every project folder[yes I know, it has no sense, but after a lot of tries i've lost my patience])
What he supplies is an .dll and an example project( that doesn't work for me because it needs OpenCV2.1 and there are instructions needs to be translate in newest version [and I prefered don't translate nothing]).
The errors in this example project are of this kind:
error LNK2001: unresolved external symbol
fatal error LNK1120: unresolved externals
The most of them are caused by the miss of OpenCV2.1, that I don't want to install, because I'll have to use it on a program using with OpenCV 3.0.0.
In the example project folder there are:
The upper mentioned .dll
A .lib file
The header file .h
These DLLs: cv210.dll, cxcore210.dll, highgui210.dll, ...(eg. cv210d.dll)
What I've done is this:
A folder called "lib" where I insert all .dll, .lib, .h files.
Put the "lib" folder in Project properties>linker> General> Additional Library Directories
Writing the .lib file in properties>linker> Input> Additional Dependencies
Put the 'lib' pathproperties>C/C++>Additional Include Directories[I know, this has no sense too]
I get these kind of errors:
error LNK2001: unresolved external symbol
I've tried #pragma comment(lib, 'file.lib') way too.
Someone can help me?
I'm in the process of porting one of my project to an existing framework I've been developing. As a result I have two project, one that's the original I developed and then the ported one.
The problem I'm having is that the new project doesn't link. The error is "... unresolved external symbol ..." where the symbols should be defined in a library that's linked together with the project. By using VS command line tool dumpbin.exe I confirmed that the symbols said to be missing are in the library. The original project works fine, only by removing the library from the Linker->Input->Additional Dependencies do I get the same errors for that project.
Are there other reasons for "... unresolved external symbol ..." or am I simply not linking the library?
Details
The library in question is OpenCL.lib and the errors are "error LNK2019: unresolved external symbol _clBuildProgram#24 referenced in function ..." for all OpenCL API calls. Using the technique described in Tools for inspecting .lib files? I get the symbols for each function as one would expect.
Okay, figured it out. The library I'm linking with is only for x64 architectures, switching to that platform got it working.
Would've liked a more descriptive error from VS but what can you do...
I walked through this tutorial and tried to recreate the example I get this error:
Error 1 error LNK2019: unresolved external symbol __imp__GetXyz#0 referenced in function _main app.obj app
If I download the source from the website and run the project in visual studio it works, but If I even copy the code from the original project in my own visual studio solution it still doesn't work. I guess it must be some project settings, I don't know. What do do?
You need to add the XyzLibrary.lib to your Linker settings within project settings.
You can also do it directly in code by using #pragma comment(lib,"xyzlibrary.lib") if you are using VisualStudio.
The reason why it works in the given sample without these 2 approaches is that in the solution file, the dependencies are set from XyzExe to XyzLib, and XyzProject has 'Link Library Dependencies' in Linker settings set to true. However, I am not too keen on this approach, as I don't like to store data important for building inside solution files (for larger projects, developer's solution files can differ from build system solution files)
Seems like you are missing some external library that needs to be linked in. Whatever provides the GetXyz function is missing.
Open the Solution that works, right click the project, Properties, Linker, Input, and check what their Additional Dependencies list up. You need to add the same to your own project.
I have a project that includes files from a different project. I am getting linking errors...
"unresolved external symbol "public: _cdecl classA::classA(void"
(??()classA ##QEAA#XZ) referenced in function "class classA *_cdecl
functionB(char const*)" (?functionB##YAPEAVClassA##PEBD#Z)...
and other 125 errors of the same type (after the constructor, which is the error I just listed, every function from the class I use is mentioned in one of the link errors).
The path for including the files of the second project is included in my property sheet. That project, on its own, builds fine.
I have tried to add that project to my solution, and add it as a dependency. No help. I have tried to add the dll that it creates in the project - linker - input. No help.
In Configuration properties, the Runtime Library is set to /MTd.
I have even tried to add extern "C" in front of my include. No help.
I have tried to build them with Debug or Release, x64 or Win32. I prefer Release x64 but I'll take anything.
Could you please help me - tell me what am I doing wrong, or where to look to fix this problem ? Thank you very much.
When you build the project which yours depends on, it should produce both a lib and a dll. You need to link that lib with your project. See this thread for a screenshot of how to link the lib in your project.
I found out that my dependencies in the Link - Input were being removed by the fact that I didn't explicitly specify that I can have dependencies in the property sheet. After changing the property sheet, I finally was able to create a dll.