C++, 3rd party libraries work in one project, but not in another. RRS feed

  • Question

  • Hello, I come from an Eclipse/Intelli-J (Java) background, so I find Visual Studio for C++ a bit overwhelming ( 2015 Community, 64-bit on Windows 8.1 and 10).

    I was given a "Hello World" project (fully with *.sln file) that requires NLib.lib and NMTLib.lib from Solid Modelling Solutions (NURBS). I got it working fine on any number of computers by ensuring the correct path to those libraries in the project properties (Linker and C/C++ sections).
    ... it's more than a Hello World, it does real computations, but the code is little more than a delegation to the libraries - really nothing extravagant ...

    Now, I need to integrate this into a QT GUI environment. No problem, right? QT provides excellent plugins for Visual Studio 2015. I have another project with a reasonably elaborate Graphical User Interface already designed: it's working fine in Visual Studio.

    Here's the catch:

    - I can take my existing QT GUI project (or create a new one in VS 2015), link the *.lib files, insert all the #include <...>  statements from the Hello World project and all builds fine and also runs fine.

    - As soon as I insert C++ code that actually makes use of the included headers, the build gives me LNK2019, LNK2001 and LNK1120 errors: unresolved symbols.

    - Compiling the solution (Ctrl-F7) is very happy: it's building the solution that complains of unresolved dependencies

    - No problem with the SAME CODE in the Hello World example.

    What gives?

    I verified that the project properties are the same, no good.

    Can anyone point me in the right direction?
    Frustrated but thankful for your help!

    • Edited by RingAndReed Saturday, May 13, 2017 4:50 PM
    • Moved by 宝宝徐 Tuesday, May 16, 2017 5:27 AM
    Saturday, May 13, 2017 4:41 PM

All replies

  • Hi,

    This forum is discussing Visual Studio WPF/SL Designer, Visual Studio Guidance Automation Toolkit, Developer Documentation and Help System, and Visual Studio Editor. Qt Visual Studio Tools is not supported by us, I recommend you could ask question in QT forum: https://forum.qt.io/category/4/qt-development

    Best regards,


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    Monday, May 15, 2017 5:46 AM