Selon atubar <atu...@126.com>: > Thanks for your help, I modify those params and get right return values now. > > As I want to write a function, which can automatically return a rusult, that > whether the input raster file has a set of subdataset. > I use a metadata item of "subdataset", and this value is known from another > program but not api doc.
I'm not sure what your question is. You can find documentation about subdatasets here : http://gdal.org/gdal_datamodel.html . and here to extract metadata : http://gdal.org/classGDALMajorObject.html#8ce3bf5795bbebfe9bc643e2152bb360 > > By generally reading the api doc, and as a freshman, I find it hard to get > exact value of those const char params and options. > > Do you have a good idea? Could you be more explicit about what is not clear and quote the actual function names ? Otherwise nobody can really help you or improve the doc. Studying the source code of GDAL/OGR utilities is also often a great source of knowledge about how to use the API : http://trac.osgeo.org/gdal/browser/trunk/gdal/apps > > > > > å¨2009-10-16 01:50:33ï¼"Even Rouault" <even.roua...@mines-paris.org> åéï¼ > >Selon Chaitanya kumar CH <chaitanya...@gmail.com>: > > > >Atubar > > > >As Chaintanya says and the doc recommands it, you must use the macro and not > >string values directly. For one good reason : #define ODrCCreateDataSource > >expands to "CreateDataSource"... So "ODrCCreateDataSource" is an invalid input > >for OGRSFDriver::TestCapability(). > > > >You're also mentionning functions that take strings as arguments but you don't > >know which values are valid. Could you be more explicit about which functions ? > >Generally the doc should make it clear about the expected meaning / accepted > >values. But things can always be improved ;-) > > > >Even > > > >> atubar, > >> > >> Here is a sample. > >> http://trac.osgeo.org/gdal/browser/trunk/gdal/apps/ogr2ogr.cpp#L401 > >> The preferred #define macro forms are used here. ( > >> http://www.gdal.org/ogr/classOGRSFDriver.html#6c37cb7552902cd27cd6d4b904d7c744 > >> ) > >> > >> As per your problem, perhaps the drivers you tested did indeed not support > >> creation and deletion. Which drivers were they? > >> > >> 2009/10/15 atubar <atu...@126.com> > >> > >> > Hi, > >> > > >> > I want to take a test about the capability of creation and deletion for > >> > all supported formats of ogr . > >> > > >> > The code like below,  The parameter "const char" are copied from api doc. > >> > But all flag return a value of 0, why ? > >> > > >> >   int flag; > >> > > >> >   flag=poDriver->TestCapability("ODrCCreateDataSource"); > >> >   if(flag==TRUE) > >> >    cout<<endl<<"  --Supported Creation. "<<endl; > >> >   flag=poDriver->TestCapability("ODrCDeleteDataSource"); > >> >   if(flag==TRUE) > >> >    cout<<endl<<"  --Supported Deletion. "<<endl; > >> > > >> > Many funcions need const char * params, is there a list of these values ? > >> > > >> > > >> > > >> > > >> > ------------------------------ > >> > > >> ç½ÂæÂÂÃ¥ÂÂå Âå¹´èÂÂ亿èµÂæÂÂé > >ï¼Â3Då½éÂ懫Â游ãÂÂ天ä¸Âè´°ãÂÂï¼Âå Âè´¹é¢Âå ÂçÂÂ<http://allyes.nie.163.com/main/adfclick?db=afanie&bid=1256,612,23&cid=146,4,1&sid=1353&show=ignore&url=http://tx2.163.com/fab.html> > >> > _______________________________________________ > >> > gdal-dev mailing list > >> > gdal-dev@lists.osgeo.org > >> > http://lists.osgeo.org/mailman/listinfo/gdal-dev > >> > > >> > >> > >> > >> -- > >> Best regards, > >> Chaitanya kumar CH. > >> > > > > > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
