Handle LOCAL files during a web session

I'm developing an application with Forms 6i.
Please consider the following command line:
text_io.fopen('c:\tmp.txt','r')
In client/server mode the file "tmp.txt" is searched on the local computer (on
the client).
In web mode the file "tmp.txt" is searched on the server.
How can I open the "tmp.txt" file on the CLIENT computer, also in web mode?
Is there a way to handle local files during a web session?
Thank you in advance!

There is a java upload bean available on OTN (somewhere in the javabean/pjc section of examplecode) ... this one lets you do what you want, but it's violating the java sandbox functionality and hence need to be certified/signed to use in a browser - which i personally think is somehwat a hassle ... also it just copies the file to the middletier - you still will need to then read it from there.
i've found that using the webdb/portal approach for file handling is much easier. if you alerady run on web then you probably anyway have installed 9ias or a webdb/portal server somewhere ... using web.show_document builtin and a very small webdb procedure (something like 10 lines of code) will allow you to easily upload a file directly into the database into an blob!
have a search through this forum ... i posted a working example a few days back (somewhen last week) on this forum!
Cheers,
Stefan

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Last edited by Layus (2012-10-29 18:24:39)

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Hi All, 
 
Yesterday evening we had a discussion concerning ESA architecture. We want to create (web)services for accessing the SAP business objects (using XI) and use these (web)services via visual composer, webdynpro or custom java development. 
 
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Kind regards 
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Note: Transaction Locking during multiple Webservice "sessions".
Message was edited by:
Joris Verberckmoes

There are multiple strategies how to resolve this. They require that the last change time is available in the changed object, and also that the client keeps the value of the change time when it read the data.
1. First one wins
Immediately before posting the changes, the current change time is read from the server. In case it is different from the client buffer, then the client changes are discarted.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B checks if server change time has changed (result is no)
5. Client B writes his changes to the server
6. Client A changes its buffer
7. Client A checks if server change time has changed (result is yes)
8. Client A discarts its changes
2. Last one wins
Easy. Client just writes his changes to the server, overwriting any changes that might have occured since it read the data.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B writes his changes to the server
5. Client A changes its buffer
6. Client A writes its changes to the server -> changes from client B are lost
3. Everybody wins
Most complicated. In case of concurrent changes, the client is responsible for merging his changes with the changes from other clients and to resolve any conflicts.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B checks if server change time has changed (result is no)
5. Client B writes his changes to the server
6. Client A changes its buffer
7. Client A checks if server change time has changed (result is yes)
8. Client A merges its changes with changes from client B
9. Client A writes his changes to the server
"Last one wins" is definitely not water-proof. But even with the other strategies, data can potentially get lost in the short timeframe when the change time is checked and the actual update.
To make it more secure, server support is required. E.g. the client could pass the change time from its read access to the server. The server can then reliably reject the update if the change data has been updated in beetween by another client.

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Handle LOCAL files during a web session

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