Sorry, my mistake... I had my logging in the wrong place. styleChars is
actually of the form (including the leading space):
' PEN(c:#A08080,w:2pt); LABEL(c:#000000,s:18pt,t:{title})'
On 3 Aug 2014, at 8:35 pm, Nik Sands <nix...@nixanz.com> wrote:
> 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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