Store result of custom keyword operation in a user defined project variable?

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cunderw wrote:

The only way I've found to do this is use set variable and select last operation result.

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That's the standard approach, and it's used by the built-in operations as well.

That said, you can probably use an operation parameter for the output variable name. Say it's named OutVariableName, and should contain just the variable name, without the Project.Variables prefix.

<!-- description.xml -->
<KDTOperation Name="My Operation" Category="My Category">
  ...
  <Parameters>
    ...
    <Parameter Name="OutVariableName">The name of a project variable to save the operation result to.</Parameter>
  </Parameters>
  ...
</KDTOperation>

In the operation code, you can check if the variable is specified and exists, and if so save the operation result to it. (Note: the code is off the top of my head and untested.)

// JScript
function MyOperation_OnExecute(Param1, ..., OutVariableName){
  // Do something
  ...
  var result = true;

  var strVarName = Parameters.OutVariableName;
  if ((strVarName == null) || (strVarName == "")) {
    // Variable name isn't specified
    ...
  } else if (! Project.Variables.VariableExists(strVarName)) {
    // Variable doesn't exist
    ...
  } else {
    // Variable exists - save the operation result to it
    Project.Variables.VariableByName(strVarName) = result;
  }

  return result;
}