Error <MAXSTRING> (Stream to %xsd.base64Binary)
Hello everyone :-) A colleague wants to use data got from a stream into another type of object: %xsd.base64Binary (related to a webservice context).
His code works for regular data, but the following error appears when parsing large streams (~43 MB): "ERREUR #5002: Erreur Cache: <MAXSTRING>"
Here is below his code:
Class (...).StampDataRequest Extends Ens.Request [ ProcedureBlock ]
{
…
Property DocumentData As %xsd.base64Binary;
…
}
Method OnRequest(pRequest As Ens.StreamContainer, Output pResponse As Ens.Response) As %Status
{
...
set fileStream = ##class(%Stream.GlobalCharacter).%New()
do fileStream.CopyFromAndSave(pRequest.Stream)
//fileStream contains bytes from pRequest
set tsRequest = ##class((...).StampDataRequest).%New()
…
do fileStream.Rewind()
while 'fileStream.AtEnd {
set tsRequest.DocumentData = tsRequest.DocumentData_fileStream.Read(30000)
}
…
}
What should he change in this code for not to have this size limitation ?
Best regards,
Mathieu
I've read that some users have seen the <MAXSTRING> error when they have "Log Trace Events" enabled for a particular business host. Can you try disabling this and re-running your program?
http://docs.intersystems.com/ens201317/csp/docbook/DocBook.UI.Page.cls?K...
Hi
Your request class tsRequest has a property DocumentData which I assume has a data type of %String. There is one thing you need to check and to things you can do in the request class:
1) Make sure that the setting for "Support Long Strings" setting in your Cache Instance is set to true. The setting can be found in the Management Portal at System Administration > Configuration > System Configuration > Memory and Startup
2) in the class definition for your request class use the following definition for your DocumentData specify the definition as follows:
Property DocumentData as %String(MAXLEN="", TRUNCATE);
Turning on Long Srinngs enables you to store up to 3,641,144 characters.
The Attribute MAXLEN="" says the Maximum Length of the property is the maximum string length supported i.e. 3,641,144 characters.
The TRUNCATE attribute will chop off any characters that exceed the MAXLEN without throwing a MAXSTRING error
Nigel
In his class definition, DocumentData is a %xsd.base64Binary, not a string.
Replace:
do fileStream.Rewind() while 'fileStream.AtEnd { set tsRequest.DocumentData = tsRequest.DocumentData_fileStream.Read(30000) }with
do tsRequest.DocumentData.CopyFrom(fileStream)or even:
do tsRequest.DocumentData.CopyFrom(pRequest.Stream)Hi,
This line :
"do tsRequest.DocumentData.CopyFrom(fileStream)" don't work.
Error:
ERREUR #5002: Erreur Cache: <INVALID OREF>
tsRequest.DocumentData not recognized as a Stream !!! (In his class definition, DocumentData is a %xsd.base64Binary)
Thanks
Phil.
Change property definition to %Stream.GlobalCharacter instead.
if i change property in the client webservice class, will the external webservice called still work ?
Thanks
It should but requires testing
Hello,
In the client classes of the external webservice, i changed for the "DocumentData" property, in several places, ,"%xsd.base64Binary" to "%Stream.GlobalCharacter". I recompiled the classes.
After this, in the "Ensemble" connector, i had to do the conversion to Base64 imyself.
Indeed, with "%xsd.base64Binary" the conversion to base64 was done automatically during the transfer.
Now, in my example, fileStream is a base64 stream, and here's how my "DocumentData" property is assigned:
do tsRequest.DocumentData.CopyFrom (fileStream)
I tested and the return from the remote webservice is correct with the same hashing values.
Thank you very much for your help.