On 04/10/10 07:32, Mikhail Artemiev wrote:
Hi everybody once more!
Now I am ready to share my experience to use Gmsh functions in my own
program.
Thank to Mikhail Titov's advice I found in utils/api_demos the examples
of using Gmsh API.
Then I found in Gmsh reference manual this text:
<<Finally, to use Gmsh at the third level (i.e., to link the Gmsh
library with your own code),
you will need to learn the internal Gmsh Application Programming
Interface (API). No
complete documentation of this API is available yet; a good starting
point is Section C.2
[Source code structure], page 185, which gives a short introduction to
Gmsh's internal source
code structure. Then have a look e.g. at the examples in the
'utils/api_demos/' directory
in the source code. Due to the many possible configuration options (and
associated external
dependencies), we currently do not distibute precompiled versions of the
Gmsh library.
To build the library see the instructions in the top-level 'README.txt'
file in the source
distribution.>>
Ok, cmake was downloaded and after some torture Gmsh.exe, Gmsh.dll and
Gmsh.lib was created.
Then I included Gmsh.lib in my Visual Studio project
(Properties->Linker->Input->Additional Dependencies) where I had only
one cpp-file (mainSimple.cpp from utils\api_demos):
#include <stdio.h>
#include <gmsh/Gmsh.h>
#include <gmsh/GModel.h>
#include <gmsh/MElement.h>
int main(int argc, char **argv)
{
GmshInitialize(argc, argv);
//GmshSetOption("Mesh", "Algorithm", 5);
GModel *m = new GModel();
m->readGEO("../../tutorial/t5.geo");
//GmshMergeFile("../../tutorial/t5.geo"); // will also set the bbox
m->mesh(3);
for(GModel::riter it = m->firstRegion(); it != m->lastRegion(); ++it){
GRegion *r = *it;
printf("volume %d contains %d elements:\n", r->tag(),
r->getNumMeshElements());
for(unsigned int i = 0; i < r->getNumMeshElements(); i++)
printf(" %d", r->getMeshElement(i)->getNum());
printf("\n");
}
m->writeMSH("test.msh");
m->writeUNV("test.unv");
delete m;
GmshFinalize();
}
After compilation I have 1225 errors like these:
Description File Project
Error 1 error LNK2001: unresolved external symbol "public: static int
__cdecl Fl::check(void)" (?ch...@fl@@SAHXZ) Gmsh.lib delme
Error 5 error LNK2001: unresolved external symbol "void __cdecl
fl_alert(char const *,...)" (?fl_alert@@YAXPBDZZ) Gmsh.lib delme
et cetera
Hi Mikhail - Then for some reason cmake detected that you had the fltk
lib installed, but fails to get symbols from it.
I suggest to configure the gmsh lib with a minimal set of dependencies
(uncheck all the optional packages in the cmake config), and see if this
works...
If I delete Gmsh.lib from 'Additional Dependencies', after compilation I
have 8 errors like these:
Description File Project
Error 4 error LNK2001: unresolved external symbol "public: int
__thiscall GModel::mesh(int)" (?m...@gmodel@@qa...@z) main.obj delme
Error 7 error LNK2001: unresolved external symbol "int __cdecl
GmshFinalize(void)" (?GmshFinalize@@YAHXZ) main.obj delme
et cetera
In first case I tried to include a fltk library (I thought that 'Fl'
means a part of 'fltk'), but I miscarried.
Because of <<no complete documentation of this API is available yet>>
can anybody help me?
Thanks
Mikhail Artemiev, PhD student, NSTU
Mikhail Titov:
I would suggest to communicate with Gmsh using network. Take a look at
the
source code. It has a couple of nice examples in utils/solvers
subfolder. It
will definitely save some time since you can reuse existing instance
instead
of launching new process every time.
IMHO it would be the last resort to link gmsh code in.
Mikhail
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
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