使用Visual Studio 2013进行cURL

Question

So i have came along with cURL as a very nice library and working very fine in OSX. But on windows now i have got big troubles with getting ready with this library. I googled now for about 2 days and tried over a dozen (in detail) different ways to get this ready. Without any success at all.

Here are some ways I basically tried:

1. The direct Download : The problem here already starts with the right download. The official download page is pretty confusing, so i considered this "cURL Download Wizard" > "libcurl development" which gives me a version, that i should be able to include into any project. But how exactly to include it? In ANY instructions out there it leads me to directories i dont even have. Almost always this "curllib.lib" is mentioned. I downloaded about 6 different versions on that downloadpage, in none of them there is this file. (See for example this instruction)
2. Git + CMake : As a solution on the aboves Link there is suggested to use git clone on this. I did all the instructions there and also get the Projects generated with just warnings. But here it says as well:
   After building install target, your will find bin/include/lib folders in C:\\curl.vc12
   Well, i did not really get his point of "build install target", i just build the entire project map as it comes. Compiles fine (115 succeeded, 0 failed, 2 skipped). But now C:\\curl.vc12 is not there. What do i have to pre-setup before compiling this?
   
3. NuGet : The idea comes from the link in point (1) again, a different solution with NuGet.
   With Successfully added 'curl 7.30.0.2' to test. it also seemed nice, but compiling simple.c leads to a bunch of unresolved external symbol linker errors. But a solution is provided:
   Make sure the include directory and lib directory are specified under the Visual C++ directories in project properties.
   So in Project > Properties > VC++ Properties > "Include Directories" and
   Project > Properties > VC++ Properties > "Library Directories"
   as well as in Project > C/C++ > General > "Additional Include Directories" and in Project > Linker > General > "Additional Library Directories" I desperately added the \\packages\\ path from my project folder.
   As mentioned in the instructions, I added libcurl.lib;libeay32.lib;ssleay32.lib;Ws2_32.lib;libssh2.lib;zlib.lib;wldap32.lib; to Project > Linker > Input > "Additional Dependencies" .
   All that done, the unresolved external symbol errors are gone! Therefore I get just one error saying cannot open file 'libcurl.lib' . What can I do here?
   

I am pretty new to all that. But I am trying really hard now to get this finally to work. So what can I do?
I work with Visual Studio 2013 Community Edition. The currently most recent version of cURL is 7.42.1 . Any help is highly welcome!

Answer 1

Had problems myself, finally got it working now. I downloaded curl-7.42.1.zip from the official website . Within the archive you'll find the source code and winbuild/BUILD.WINDOWS.txt, which basically contains the instructions I followed. I'll assume that it has been unzipped to C:\\curl-7.42.1.

Open the Visual Studio command prompt located at

C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\Common7\\Tools\\Shortcuts

This automatically sets the environment variables needed to use Visual Studio tools like the compiler. Then move to the winbuild directory and call

nmake /f Makefile.vc mode=dll

as described in the text file I mentioned above.

That will create the directory

C:\\curl-7.42.1\\builds\\libcurl-vc-x86-release-dll-ipv6-sspi-winssl

containing libcurl.dll, libcurl.lib and the necessary header files. Let's rename it to C:\\curl-7.42.1\\builds\\release :'D

1. Then open your project.
2. Open your project's properties.
3. Make sure you choose Release as configuration (top left corner)!
4. Navigate to VC++ Directories > Include directories and add C:\\curl-7.42.1\\builds\\release\\include
5. Add C:\\curl-7.42.1\\builds\\release\\lib to VC++ Directories > Library directories .
6. Go to Linker > Input > Additional Dependencies and add libcurl.lib .
7. Finally copy C:\\curl-7.42.1\\builds\\release\\bin\\libcurl.dll to your project folder.

That should do the trick! :D If you want to use cURL in debug mode, you can do almost the same, recompile using nmake /f Makefile.vc mode=dll debug=yes , go to your project's properties, add the newly created directory paths (changing libcurl.lib to libcurl_debug.lib) and you should be done.

Answer 2

I had the same issue. I downloaded the curl from https://github.com/curl/curl . you can actually compile it directly with Visual Studio 2013 (but be careful with parameters setting: x64 with release). The major difference is that it gives you libcurl_imp.lib. Then all you have to do is to set the environment variables as described above. Just want to mention, you will have to use libcurl_imp.lib rather than libcurl.lib in the additional dependencies (I suspect this change is because of the new version of curl).