Adjusting the Generated Classes for Extremely Long Strings

In rare cases, you might need to edit the generated client class to accommodate extremely long strings or binary values — values whose lengths exceed the string length limit.

When the SOAP Wizard reads a WSDL, it assumes that any string-type input or output can be represented in InterSystems IRIS as %StringOpens in a new tab, which is not always true. In rare cases, a string might exceed the string length limit. Similarly, the wizard assumes that any input or output with XML type base64Binary can be represented in InterSystems IRIS as %xsd.base64BinaryOpens in a new tab), which is not always true, due to the same string length limitation. In neither case does the WSDL contain any information to indicate that this input or output could exceed the string length limit.

When your web client encounters a string or a binary value that is too long, it throws one of the following errors:

A <MAXSTRING> error
A datatype validation error:
```
ERROR #6232: Datatype validation failed for tag your_method_name ...
```
(This error, of course, can also be caused by a datatype mismatch.)

The problem, however, is easy to correct: adjust the method signature in your generated web client class (specifically the class that inherits from %SOAP.WebClientOpens in a new tab) to use an appropriate stream class:

Use %GlobalCharacterStreamOpens in a new tab instead of %StringOpens in a new tab.
Use %GlobalBinaryStreamOpens in a new tab instead of %xsd.base64BinaryOpens in a new tab.

For example, consider a web service (MyGiantStringService) that has one method (WriteIt), which takes no arguments and returns a very long string. If you use the SOAP Wizard to generate the web client class, the web client class originally looks something like this:

Class GetGiantString.MyServiceSoap Extends %SOAP.WebClient
{

Method WriteIt() As %String 
[Final,SoapBindingStyle=document,SoapBodyUse=literal,WebMethod]
{
 Quit ..WebMethod("WriteIt").Invoke($this,"https://tempuri.org/MyApp.MyGiantStringService.WriteIt")
}

}

In this case, there is only one adjustment to make. Change the return type of WriteIt as follows:

Method WriteIt() As %GlobalCharacterStream 
[Final,SoapBindingStyle=document,SoapBodyUse=literal,WebMethod]
{
 Quit ..WebMethod("WriteIt").Invoke($this,"https://tempuri.org/MyApp.MyGiantStringService.WriteIt")
}

When you compile this class, the system automatically regenerates the associated classes as needed.

You may also need to adjust property types within any generated type classes. For example, suppose the web service uses an element called <Container>, which includes an element <ContainerPart> of type string. When you generate the InterSystems IRIS web client classes, the system creates a Container class with a ContainerPart property of type %StringOpens in a new tab. If the web service sends a string longer than the string length limit in the <ContainerPart> element, your web client throws an error. To avoid this error, change the type of the ContainerPart property to %GlobalCharacterStreamOpens in a new tab.

Other Adjustments