DLL References in Visual C

Question

I have had C   experience but not MSVC   What I am trying to do is incorporate a  dll from an open source project into my project  The code is available and I have built it  I have the  dll as well as the  lib which as I understand it is required for C   projects   Now unfortunately there is no simple  Add Reference   drop my  dll into an include directory and add that to my solution  I have edited the project property pages  the C C   Additional Include Directories option as well as adding the  lib as an additional linker dependency  I have created an include directory for the dll and lib inside my solution tree   My problem is when I try to include the header files from the documentation  VS output spits out error messages  Now I realize that I am using the dll lib combo and that the  h files are not present in my solution so how do I add the proper includes  I am using QT toolkit also which is working but how I add the other header   dll from the open source library eludes me    Can someone please point me in the right direction

User · Answer

The additional include directories are relative to the project dir. This is normally the dir where your project file, *.vcproj, is located. I guess that in your case you have to add just "include" to your include and library directories.

If you want to be sure what your project dir is, you can check the value of the $(ProjectDir) macro. To do that go to "C/C++ -> Additional Include Directories", press the "..." button and in the pop-up dialog press "Macros>>".

User · Answer

You mention adding the additional include directory  C C   General  and additional lib dependency  Linker Input   but have you also added the additional library directory  Linker General    Including a sample error message might also help people answer the question since it s not even clear if the error is during compilation or linking

User · Answer

You need to do a couple of things to use the library    Make sure that you have both the   lib and the   dll from the library you want to use  If you don t have the   lib  skip  2 Put a reference to the   lib in the project   Right click the project name in the Solution Explorer and then select Configuration Properties- Linker- Input and put the name of the lib in the Additional Dependencies property  You have to make sure that VS can find the lib you just added so you have to go to the Tools menu and select Options    Then under Projects and Solutions select VC   Directories edit Library Directory option   From within here you can set the directory that contains your new lib by selecting the  Library Files  in the  Show Directories For   drop down box   Just add  the path to your lib file in the list of directories   If you dont have a lib you can omit this  but while your here you will also need to set the directory which contains your header files as well under the  Include Files    Do it the same way you added the lib    After doing this you should be good to go and can use your library   If you dont have a lib file you can still use the dll by importing it yourself   During your applications startup you can explicitly load the dll by calling LoadLibrary  see  http   msdn microsoft com en-us library ms684175 VS 85  aspx for more info   Cheers   EDIT  Remember to use  include  lt  Foo h   as opposed to  include  foo h    The former searches the include path   The latter uses the local project files

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