EOleException in Delphi 7 ADO

[acabrera]

I am revising our Delphi 5 applications to use ADO instead of BDE. I am also converting our Delphi 5 ADO applications to run on Delphi 7. In a particular Delphi 7 ADO application, I was unsuccessful and had the following message:

Project X raised exception class EOleException with
message 'An unknown error has occurred.'

I traced the source of the error and pinpointed the statement 'Inherited CreateParams(Params) in the following procedure:

procedure TNavpageForm.CreateParams(var Params: TCreateParams);
begin
Inherited CreateParams(Params);
with Params do
begin
Style := WS_CHILD or WS_CLIPSIBLINGS or WS_CLIPCHILDREN;
Align := alClient;
end;
end;

Above procedure did not cause a problem in Delphi 5. Are there any related updates needed for Delphi 7? Thanks.

 

[michaenh]

Hi,

Check some of this points:
1.databasefile-corrupt

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q232060

2.no permission to read file
3.no permission to write file
4.no permission to create file (msaccess lockfile for ex)
5.mdac not installed

Link below is about ADO and Exceptions(Handling database errors ):

http://delphi.about.com/library/weekly/aa103001a.htm