Access Violation

[gosia]

I write an application with DOA. I have 2 forms. When you click on button on one form then the other raport-form is showing. On raport-form there is component TOracleDataSet. Sometimes before showing raport-form access violation error is raised. TOracleDataSet = nil!!!!!
Why? Can sb help me???!!!
Gosia

 

[Marco Kalter]

Where in your code does this access violation occur? Maybe the component is not yet created by the form when you access it?

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Marco Kalter
Allround Automations

 

[gosia]

So why sometimes I can access it and sometimes access violation occur??????
This error is raised when I want to change SQL statement before I preview my report.
So how should I change SQL before I open this form??

 

[Marco Kalter]

That's hard to say, but if the TOracleDataSet instance = nil, then either it is not yet created, or it is freed, or it is set to nil.

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Marco Kalter
Allround Automations