Access a return value from an IDO Extension Class

Is there a way to access the return value of an IDO Extension Class method call? I have a C# method defined like this:

public int GeneratePickList(string pLocationPrefix, int pRank, string pWarehouse, ref string pMessage)

I know I can "return" values using the 'ref' keyword, but is there any way to access the return value of the method? Or do I have to use the 'ref' moethod for every value I want to pass back to the caller.

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Accepted answers

Legacy Contributor

The return value should be an integer as shown in Bradley's example, a non-zero value signals a failure. So anything you want to capture in Mongoose as a return value should be passed by reference.

So the short answer is yes, you do want to pass values back by reference.

I did come across this older video which should serve as a relatively short tutorial when combined with the IDO dev guide you should be able to fetch the IDO runtime guide from from https://mongoose.infor.com (I haven't checked where recently probably somewhere in the learning section)

www.youtube.com/watch

I would also recommend you implement your own try/catch handling with logging to the IDORuntime logs it'll help you trace things, you can rethrow any exceptions to see them in the UI, or trap them and throw something more meaningful back to the user.

IDORuntime.LogUserMessage("MyApp", UserDefinedMessageType.UserDefined0, "hello world");

This limits you to relatively simple primitives (string, number, date) one technique I have seen is to pass back unstructured data (E.g. classes) serialised as a json string, you can always deserialise it in form script after calling your IDO method.

All comments

Legacy Contributor

In the IDO Method configuration, you set one of your parameters to be an Output parameter (it doesn't have to be a ref), and set that parameter's value in your method. The method can be void as well, it doesn't have to return a type. On your form, you configure a temp variable for that parameter. Then in your call to that method, the output parameter is an RVAR(V(FormParameter)) instead of a standard VAR(V(InputParameter)). When the method returns, the form parameter will be set to the value you set in the method.

0712050809193544.doc

Stephen Cena

I don't think I'm following....

I understand setting a parameter to be Output. However I don't understand how the C# DLL would get the value back if it a) wasn't returned or b) defined as a ref. In my experience, C# won't pass any changes back to a call if the value wasn't defined as a ref. If I'm doing a return of data (private int MethodName(.....), then I don't see how I would set the Output parameter inside Mongoose.

My inexperience with Mongoose is definitely showing with this one

BradleyBrown

Here is a real-world example method signature. In code, both InfoBar and RC are set using standard C# coding.

The int that is returned by the method is set using the Mongoose-supplied StdMethodResult class.

public int ERPPing(

string company,

out string InfoBar,

out int RC

)

Legacy Contributor

Don't think of it like a normal .NET method. Remember, it is replicating the behavior of a SQL stored procedure. So just like you would set a SQL Stored Procedure parameter as output to make it return the value you set it to, setting the IDO Method Output checkbox does the same thing. That said, you may have to append the out keyword to your .NET method parameter. I forgot about that part. See this article: docs.microsoft.com/.../out-parameter-modifier.

Legacy Contributor

Stephen Cena

Thanks, I think that covered it for me

The logging was great to learn about as well. That should help me considerably in debugging. Already doing try/catch but I've opted to return a strign w all the text I want & attach it to a Multiline text box.

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