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I created the Qmarxan plugin using the fTools plugin as an example base. When I create a new shapefile using the QgsVectorFileWriter function I don't have any difficulty specifying a "Real" field with a width of 24 and a precision of 15. However when adding fields to an existing shapefile the addAttribute call to to a vector layer complains if the field is specified with a length greater than 20 and a precision greater that 5.

Can anyone tell me why this limitation exists and how get around it?

Thanks

TSW

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That's the Shapefile (or dbf) standard if I'm not mistaken. The GUI for creating a new Shapefile has the same restrictions.

You'll have to change to a different vector format if you want/need that kind of fields.

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