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Crystal reports 8.5 and RDC 6.0

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6 replies

by chery

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Initially I developed my project using VB 6.o with RDC 6.0 as reporting tools and Oracle as back-end. The system was deployed and working fine. I upgraded the project with the crystal report 8.5 recently and problems start. After deployed the new upgraded system, I cann't view the report anymore. I always got the 'Invalid use of null' runtime error. I'm sure that the database is working fine. And I didn't change anything in my reports. The purpose that I upgrade the system is because the RDC 6.0 lack of some functionalities required and the report loading speed is very slow. I'm thinking a way to resolve this problem by changing from RDC 6.0 to crystal reports 8.5. But i'm facing this problem now. Anyone could help me? Thanks :)

6 replies

by sl-campbell

In CR look under the menu point: File|Report options. There you should see a check box to convert NULL to a standard character.

If that doesn't help then I need to know the following:

Does the error happen when previewing the report designer? With data? With-out Data?

Is there an error number?

Is the error coming from CR or VB?

Do you start seeing a blank print preview window and THEN the error happens, or before?

Does the program crash?

Have you tried removing the user made formulas to see if there is a problem here?

Try testing the report on one piece of data, one record, with all fields filled with data in the db.

If that doesn't help the post another comment to your question and I will check further.

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