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;
> }
> }
> }
> -------------------------------------------
>
>
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