libraries n stuff

hi

i hope somebody can help me, maybe explain something.

i try to use a code from another project and have several problems or
do not know enough about libraries, linking, and stuff...

the project i want to use can be compiled as dynamic library with xcode
(theres a project to do this), i recompiled the source-files as shared
library in codewarrior. for this i made a new project, added all the
..cc files to it and configured the target to build a shared library.
(right?)

then i made a project where i added the shared-library, and the correct
search paths (to the lib, and to the .h files). the .cc file looks like
this:


#include "mpisearchFaceDetector.h"

int main () {
//
// Initialize the MPISearchObjectDetector object
//

MPISearchFaceDetector mpi;

return 0;
}

the code compiles fine, but i get link errors:

Link Error : undefined:
'MPISearchFaceDetector::~MPISearchFaceDetector()' (code)
Referenced from 'main' in main.cc

Link Error : undefined:
'MPISearchFaceDetector::MPISearchFaceDetector()' (code)
Referenced from 'main' in main.cc


so, it looks like, the library does not work properly?
looks like the linker does not find the class...
do i have to take care of something, if i build the lib - entrypoint?
do i have to change a setting in the test project, tell the target
something about the lib (whatever)
how does this all work ?!!?
is it possible to use the framework (compiled with xcode)

i dont know why this does not work, and hope somebody can help me,
bringing some clarity...

thx
inx

Is you library project exporting the functions? Check the Linker panel
amd make sure that you are exporting things. For example via #pragma.


inx wrote:
> hi
>
> i hope somebody can help me, maybe explain something.
>
> i try to use a code from another project and have several problems or
> do not know enough about libraries, linking, and stuff...
>
> the project i want to use can be compiled as dynamic library with xcode
> (theres a project to do this), i recompiled the source-files as shared
> library in codewarrior. for this i made a new project, added all the
> .cc files to it and configured the target to build a shared library.
> (right?)
>
> then i made a project where i added the shared-library, and the correct
> search paths (to the lib, and to the .h files). the .cc file looks like
> this:
>
>
> #include "mpisearchFaceDetector.h"
>
> int main () {
> //
> // Initialize the MPISearchObjectDetector object
> //
>
> MPISearchFaceDetector mpi;
>
> return 0;
> }
>
> the code compiles fine, but i get link errors:
>
> Link Error : undefined:
> 'MPISearchFaceDetector::~MPISearchFaceDetector()' (code)
> Referenced from 'main' in main.cc
>
> Link Error : undefined:
> 'MPISearchFaceDetector::MPISearchFaceDetector()' (code)
> Referenced from 'main' in main.cc
>
>
> so, it looks like, the library does not work properly?
> looks like the linker does not find the class...
> do i have to take care of something, if i build the lib - entrypoint?
> do i have to change a setting in the test project, tell the target
> something about the lib (whatever)
> how does this all work ?!!?
> is it possible to use the framework (compiled with xcode)
>
> i dont know why this does not work, and hope somebody can help me,
> bringing some clarity...
>
> thx
> inx
>