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Showing results for tags 'EVariantTypeCastError'.
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I'm working with an evaluation copy of uniGUI. I'm having difficulty implementing a uniDBLookupComboBox. Link the uniDBLookupComboBox to a primary TDataset using the DataSource and DataField properties. Link the uniDBLookupComboBox to a lookup TDataset using the ListSource, KeyField and ListField properties. Open the respective datasets. Insert a new record into the primary TDataset. (This will result in an "empty" row.) This causes an EVariantTypeCastError exception. 'Could not convert variant of type (UnicodeString) into type (Integer)' I would appear that the uniDBLookupComboBox is attempting to Locate the corresponding lookup record using a null value from the primary dataset. Is there a way around this difficulty? Many thanks, MV