Linux Format forums

[nerdmaster]

I was wondering if anyone can advise me about using extra libraries with a qmake based program, since I'm quite new to these aspects of programming (with most of my experience over the past 2 years being based on Java)

I'm writing a C++ based program for a computer vision project. As a result, there are a number of external (static) libraries I need, these are for the image processing and display functions. I am also planning on making the application graphical and have opted to use the QT toolkit, using qmake.

I was wondering, how do I go about importing these libraries? (bearing in mind that I don't have much experience with make)

[Nigel]

You need to add them to the link statement in your makefile.
To link in a library called libfred.a that exists in directory /home/joe/libs (not part of $LD_LIBRARY_PATH) you would add the following two parameters to your link statement
-L /home/joe/libs -lfred

(-L adds a directory to those that will be searched for libraries, -l links in a library. The "lib" prefix and ".a" (or ".so") suffix is added by the compiler/linker.

To call routines in the library you will have to include the appropriate header file in your C++ source.
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Hope this helps,

Nigel.

[ChrisCook]

I do something like this in a project Im working on currently (http://quarkplusplus.sf.net)

In my qmake project file (*.pro) i have