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. 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?
在2009-10-16 01:50:33，"Even Rouault" <even.roua...@mines-paris.org> 写道： >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 ? >> > >> > >> > >> > >> > ------------------------------ >> > >> ç½æåå å¹´è亿èµæé >ï¼3Då½éµç½æ¸¸ã天ä¸è´°ãï¼å è´¹é¢å ç<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-...@lists.osgeo.org >> > http://lists.osgeo.org/mailman/listinfo/gdal-dev >> > >> >> >> >> -- >> Best regards, >> Chaitanya kumar CH. >> > >
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