Hi Rich! Here is the code you can use to Create an instance of a workflow named "Workflow 1" with 2 input parameters (for Workflow Web Service version 9.2):
using (WorkflowAPIBaseClient workflowService = new WorkflowAPIBaseClient())
{
InstanceCreationData instanceData = new InstanceCreationData();
instanceData.ParameterCollection = new InstanceParameterCollection();
InstanceParameterData paramData1 = new InstanceParameterData();
paramData1.Name = "TestIn1";
paramData1.Value = "xyz";
instanceData.ParameterCollection.Add(paramData1);
InstanceParameterData paramData2 = new InstanceParameterData();
paramData2.Name = "TestIn2";
paramData2.Value = "987";
instanceData.ParameterCollection.Add(paramData2);
InstanceCreationResultData result = workflowService.CreateWorkflowInstance("Workflow 1", instanceData);
}
Note that "result" does not hold the actual result of the workflow, but rather information about the workflow instance you created (such as the instance ID). This makes sense, since the call only starts an instance, and does not wait for it to finish.
At the moment, you cannot use the Workflow Web Service itself to acquire the results of the completed workflow (such as the output params). If you know when your Workflow is done, you can still use the good-ole Workflow SDK (WFSO) to get your Workflow instances though, and then maybe make a callback to the calling service with that. There are other ways of doing this kind of thing too, though the Workflow Web Service itself does not support the functionality, as it's mostly there to create instances of Workflows.
I could add to this. We have a mechanism that Workflow uses to provide a post-completion callback after an instance completes. This is used internally (for example, by the Workflow->Forms integration). As a note, this mechanism might seem a tad bit complicated and, while it is supported, it's not officially supported and thus it's not documented (but I was asked to share it anyways =)).
After a Workflow completes, it can make a callback to a WebService of your choice, established by using the following 3 "hidden" input parameters:
$SyncWebAddress = [your url]
$SyncData = [whatever data you want]
Here you can use these configurations to configure a callback that is invoked after a Workflow terminates. Upon termination, the Workflow will make a POST request to the url provided into SyncWebAddress. Various headers are also included with this (I can post more info here on this if you'd like, though I recommend debugging it first-hand). However, this mostly serves to notify your application that a WF completed or terminated so you can then process it (such as using WFSO or something). Again, this particular feature is kind of hidden and not documented anywhere else that I know of =).
Edit: I was informed that output parameters are actually written in xml to the body of the request mentioned above. Might be worth checking it out.
