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Hi im triyng to access to a shp values. I use a simple code that respect the examples given in the mapwingis web, but the get_CellValue method allways returns me an empty string. The shp file have valid data. It worked ok in the 4.6 activeX version but a few days ago i updated to de 4.8.6.0 version
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Can´t access to shapefile values
Posted by: floresbatchline ()
Date: May 11, 2012 05:31AM

Hi im triyng to access to a shp values. I use a simple code that respect the examples given in the mapwingis web, but the get_CellValue method allways returns me an empty string. The shp file have valid data. It worked ok in the 4.6 activeX version but a few days ago i updated to de 4.8.6.0 version and it doesnt work now.

IM USING C++ BUILDER 6 

Shapefile* pShape = Map1->get_Shapefile(nHandle);
for(int s = 0; s < pShape->NumShapes; s++)
{
	String sFieldName = "City";
	String sValue;
	for(int i = 0; i < pShape->get_NumFields(); i++)
	{
		String sName = pShape->get_Field(i)->Name;
		if(sFieldName == sName)
		{
			sValue = pShape->get_CellValue(i, s).bstrVal;
		}
	}
}

[Edit: made the code inline]



Edited 2 time(s). Last edit at 05/16/2012 03:08AM by pmeems.

Attachments: Example.txt (338 bytes)  
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Re: Can´t access to shapefile values
Posted by: pmeems ()
Date: May 16, 2012 01:46AM

H Flores,

I've seen your requests about commit rights to the source code.
I've replied explaining you need to send in a few patches first.

Thanks,

Paul

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Re: Can´t access to shapefile values
Posted by: floresbatchline ()
Date: May 16, 2012 02:05AM

Thanks for your atention.

Could you help directly with my problem with the get_CellValue method and the 4.8 version?

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Re: Can´t access to shapefile values
Posted by: pmeems ()
Date: May 16, 2012 03:15AM

I'm not very good with C++, but looking at the docs I can't see what you are doing wrong:
[www.mapwindow.org]

What happens if you just loop through all shapes and get the value of every first field?

And I see you are looking for the index of a field, you can also use sf.table.get_FieldIndexByName(fieldname): [www.mapwindow.org]

--
Paul

--
Don't forget to read the new documentation: www.mapwindow.org/documentation/mapwingis4.8
Join us Google+: MapWindow GIS Google+ Community
Join the MapWindow Group on LinkedIn! LinkedIn - MapWindow Group

Download the latest beta installer at:
tinyurl.com/mwMonthly 32-Bit
tinyurl.com/mwMonthlyx64 64-Bit
Follow me on Twitter MapWindow_nl to read when a new installer is published.

---
Paul Meems
The Netherlands
[www.bontepaarden.nl]
Release manager, configuration manager and
forum moderator of MapWindow GIS

Owner of MapWindow.nl - Support for
Dutch speaking users: www.mapwindow.nl

*******
Everything I say or write is my personal opinion and
not the opinion of the company I work for.
*******
View my profile on LinkedIn

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Re: Can´t access to shapefile values
Posted by: floresbatchline ()
Date: May 16, 2012 03:49AM

In wich language can you access to sf.table?
Not in C++.
Thanks

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