[Gdal-dev] Trouble linking GDAL library and Matlab

[Joaquim Luis]

guillaume huby wrote:
> Hello,
>
> Matlab offers the possibility to compile C programs and use them as 
> matlab functions. This is called Mex files and works almost like 
> making a dll. I used Visual Studio 2005 Pro and FWTools 1.2.1 in order 
> to be able to use GDAL inside Matlab.
>
> The simple C program I made is below and just take a string in input 
> and returns 1.

Guillaume,

Why do you include gdal_priv.h?
In my mexs I always include only gdal.h.

In case you are interested my package, Mirone, has a gdalread and a 
gdalwrite mex file.
I also have a gdalwarp mex but it is not released yet. It is waiting for 
bug 1393
http://trac.osgeo.org/gdal/ticket/1393
to be corrected

Mirone is here
w3.ualg.pt/~jluis/mirone

Joaquim Luis
>
> ---------------------------------Start 
> Code-----------------------------------------
> #include "gdal_priv.h"
> #include "mex.h"
>
> void mexFunction(int nlhs, mxArray *plhs[],
>                  int nrhs, const mxArray *prhs[])
> {
>
>     double *y;
>     char *pszFilename;
>     int bufLen;
>     int status;
>
>     /* Create a 1-by-1 matrix for the return argument. */
>     plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
>
>     /* Input must be a string. */
>     if (mxIsChar(prhs[0]) != 1)
>         mexErrMsgTxt("Input must be a string.");
>
>     /* Input must be a row vector. */
>     if (mxGetM(prhs[0]) != 1)
>         mexErrMsgTxt("Input must be a row vector");
>
>     /* Get the length of the input string. */
>     bufLen = (mxGetM(prhs[0]) * mxGetN(prhs[0])) + 1;
>
>     /* Allocate memory for input string. */
>     pszFilename = (char *) mxCalloc(bufLen, sizeof(char));
>
>     /* Copy string data from prhs[0] into a C string inputBuf. */
>     status = mxGetString(prhs[0], pszFilename, bufLen);
>     if (status != 0)
>         mexWarnMsgTxt("Not enough space. String is truncated.");
>
>     /*GDALDataset  *poDataset;
>
>     GDALAllRegister();*/
>
>     /*poDataset = (GDALDataset *) GDALOpen( pszFilename, GA_ReadOnly );
>     if( poDataset == NULL ) {
>     } else {
>         mexWarnMsgTxt("Could not open dataset.");
>     }*/
>
>     /* Assign a pointer to the output. */
>     y = mxGetPr(plhs[0]);
>
>     *y = 1.0 ;
> }
> --------------------------------------------End 
> Code-------------------------------------
>
> Without #include "gdal_priv.h" everything is fine, but with there is a 
> problem of dependency (Matlab cannot find some library) althought all 
> gdal (all found in FWTools\bin) dlls are in path (checked with depends 
> walker).
> Discussion with Matlab support identified the problem in "gdal_priv.h" 
> line 56 #include <vector>. AFAIK, <vector> is a STL standard C++ library.
> Did I missed something ? linking with some special library ?
>
> Thanks for your help.
> Guillaume.
> ------------------------------------------------------------------------
>
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