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|How to receive a PDF file via a service
|Tue, Feb 16 2021 2:46 AM
I need to send a couple of bits of filter criteria via a service to my rest server, where a report will be generated as a pdf file. The service can then return the pdf file.
My question is what data type is best used for EWB to receive the pdf file? I haven't written the rest service yet, so wondering what EWB needs to receive.
|Tue, Feb 16 2021 8:31 AM
So I just found out the correct way to send the pdf file from my rest service is using a TStream.
How do I receive a TStream in EWB and then display the pdf file?
|Wed, Feb 17 2021 11:01 AM
Paul Coshott wrote:
>I need to send a couple of bits of filter criteria via a service to my rest server, where a report will be generated
> as a pdf file. The service can then return the pdf file.
>My question is what data type is best used for EWB to receive the pdf file? I haven't written the rest service yet, so >wondering what EWB needs to receive.
There are two ways that pop in mind.
I generally display in a TBrowser.
One solution is to set the header field declaring the content as Applicaiton/PDF
and then just dump the PDF in the output and have the TBrowser load the file as a URL, passing any parameters you need on the URL line encoded in typical URI format. This is the simplest.
The other solution I use elsewhere is to Base64 encode the PDF on the server and return it in a string field in your JSON. returned to the client. Then assign the PDF string to the url of the TBrowser after loading the JSON into a TDataset. This is handy for a number of reasons, you can pass along other parameters in the JSON (such as file date, etc.). You will need to look up how to create a PDF Base64 encoded URL. It's not hard.
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