How to use Image as parameter?

By: James Lin - inchlin
How to use Image as parameter?
2003-05-07 23:26
I try to use image in my report
The image has one "expression" field
What should I put on this field?
Suppose the parameter call "DoctorName" and the datatype is inputstream
Then I should set my image datatype to "inputstream"?

Thanks for any help!

By: Teodor Danciu - teodord
RE: How to use Image as parameter?
2003-05-11 04:44


I'm not sure where your image comes from.
If it comes from a report parameter, you should
know that you can pass anything as parameters.
And you could even pass a java.awt.Image object
from the parent application to the report.
Or you could pass the file name as a parameter,
if the image is loaded from a file.

This can be seen in the "jasper" sample,
where the image in the summary section is passed
as a java.awt.Image parameter.

But if the image comes from a data source field,
then we have a different story.
It depends on whether you are getting the data
from a database through an SQL query or if you are
supplying an in-memory JRDataSource instance.

If the image comes from a database, then I think
you should indeed declare the image corresponding
report field as a and use it
directly in the <imageExpression>.

But if you use a custom made JRDataSource,
you have the freedom to pass the image in
whatever form your might want to: filename,
Image object, URL, etc.

I hope this helps.
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