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Thread: Read a Crystal Report from the PLUGIN table using C#

Adam Conde
Posts: 14

Read a Crystal Report from the PLUGIN table using C#
Posted: 23 Aug 07 5:19 PM

I am trying to retrieve Crystal Reports from the DATA field in the PLUGIN table using C#.
I'm using the oledb version of the function described on this Microsoft KB article: http://support.microsoft.com/kb/317043

I am not going through the SLX provider for this particular function because it won't parse the SQL that this function uses.

It does work at pulling out the data and building the .rpt file. However, the resulting file is corrupt. Comparing the generated file to the real file in windiff shows that the generated file was formed with the correct data, just built in the wrong order.

Any ideas?

[Reply][Quote]

Ryan Farley
Posts: 2265

Re: Read a Crystal Report from the PLUGIN table using C#
Posted: 23 Aug 07 6:30 PM

It's not that the report is corrupt, but what you are reading out of the BLOB on the plugin table isn't just a report, it's a serialized Delphi TComponent that has the actual Crystal report appended to the end of it. A serialized component wil end in two consecutive null chars (0x00 0x00) and will not contain two consecutive null chars internally. So, what you need to do is read the BLOB contents out, then look for the two consecutive null chars. Everything following that is the report that you can write out to write out to the RPT file.

Does that make sense? I've got my own C# code that does just this and it works great.

-Ryan

[Reply][Quote]

Adam Conde
Posts: 14

Re: Read a Crystal Report from the PLUGIN table using C#
Posted: 23 Aug 07 6:41 PM

Thanks.
Makes sense, but I'm not entirely sure how to handle this. I made the leap to C# last week (so far I love it) and this is the first difficult road block I've encountered.

[Reply][Quote]

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