On one of the iterations through this code, styleChars is:
'vegetation_low: BRUSH(fc:#A0F0A0); LABEL(c:#004000,s:18pt,t:{title})'
So perhaps the inclusion of the style name is the problem?
This was read into a style table from a text file using
'OGR_STBL_LoadStyleTable()'. I had assumed that a similar format to .ofs was
suitable. If this is not the case, how should I read a style table from a text
file in such a way that I can distinguish the various styles by name?
In guess my more general question is: What is the correct way to read styles
from an arbitrary text file into a style table, and then use a style manager to
get the various parts/tools?
On 3 Aug 2014, at 8:26 pm, Even Rouault <even.roua...@mines-paris.org> wrote:
> Le dimanche 03 août 2014 12:11:42, Nik Sands a écrit :
>> I'm just starting out using the styles features of OGR (using the C API)
>> but at struggling with a few elements of it.
>>
>> My code (copied below) fails to get any OGRStyleToolH. Ie, the "if ( tool
>> )" block never gets run, because 'tool' is always NULL at the point
>> indicated by the comment. But the execution does reach that point in the
>> code which indicates that the OGRStyleMrgH does in fact include at least
>> one part (tool).
>>
>> I'd be grateful if somebody could point out what I'm doing wrong.
>
> Nothing strikes me as wrong. A potential explanation is that styleChars
> doesn't contain a valid OGR Feature Style string.
> GetPartCount() counts the number of ";" separating style parts, but it
> doens't
> check that each style part actually begins by a recognized tool name (PEN,
> BRUSH, SYMBOL, LABEL). OGR_SM_GetPart() does this check however and if it
> cannot recognize it it returns a NULL tool.
>
>>
>> Thanks,
>> Nik.
>>
>>
>> -------------------------------------------
>> const char *styleChars = OGR_STBL_GetNextStyle(table) ) )
>> NSString *styleName = [NSString
>> stringWithUTF8String:OGR_STBL_GetLastStyleName(table)]; OGRStyleMgrH
>> styleMgr = OGR_SM_Create(NULL);
>> OGR_SM_InitStyleString(styleMgr, styleChars);
>>
>>
>> for ( int i = 0; i < OGR_SM_GetPartCount(styleMgr, NULL); i++ )
>> {
>> OGRStyleToolH tool = OGR_SM_GetPart(styleMgr, i, NULL);
>>
>> if ( tool ) // 'tool' always NULL here
>> {
>> switch ( OGR_ST_GetType(tool) )
>> {
>> case OGRSTCPen:
>> self.pen = tool;
>> break;
>>
>> case OGRSTCBrush:
>> self.brush = tool;
>> break;
>>
>> case OGRSTCSymbol:
>> self.symbol = tool;
>> break;
>>
>> case OGRSTCLabel:
>> self.label = tool;
>> break;
>>
>> default:
>> NSLog(@"Unknown style tool type!");
>> break;
>> }
>> }
>> }
>> -------------------------------------------
>>
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev@lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
> --
> Geospatial professional services
> http://even.rouault.free.fr/services.html
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