Lots of work on FormatMessage and FormatErrorMessage. These can now print enums.

Source/Integration/FormatError.h

@@ -22,14 +22,21 @@ class FString;
 class UEdGraph;
 class UObject;
 
-
-
-
 //
-// The Format Error Message K2Node.
+// FormatMessage and FormatErrorMessage
+//
+// This file defines two K2Nodes: FormatMessage, and FormatErrorMessage.  The
+// only difference between them is that the former outputs the message as an
+// output pin.  The latter outputs the message to the log instead.
+//
+// To implement code reuse, we put all the code into FormatMessage, and made
+// FormatErrorMessage a derived class of FormatMessage.  The derived class
+// doesn't override anything - all it does is set a flag, the flag changes
+// the behavior of FormatMessage.
+// 
 //
 UCLASS(MinimalAPI)
-class UK2Node_FormatError : public UK2Node
+class UK2Node_FormatMessage : public UK2Node
 {
 	GENERATED_UCLASS_BODY()
 
@@ -60,14 +67,17 @@ class UK2Node_FormatError : public UK2Node
 	virtual int32 GetNodeRefreshPriority() const override { return EBaseNodeRefreshPriority::Low_UsesDependentWildcard; }
 	//~ End UK2Node Interface.
 
-private:
+protected:
 	/** Create all necessary pins */
 	void CreateCorrectPins();
 
 	/** Synchronize the type of the given argument pin with the type its connected to, or reset it to a wildcard pin if there's no connection */
 	void SynchronizeArgumentPinType(UEdGraphPin* Pin);
 
-private:
+	/** Our derived class will set this to true, altering the behavior of this K2Node. **/
+	virtual bool IsFormatErrorMessage() const { return false; }
+
+protected:
 	/** When adding arguments to the node, their names are placed here and are generated as pins during construction */
 	UPROPERTY()
 	TArray<FString> PinNames;
@@ -76,3 +86,18 @@ private:
 	FText NodeTooltip;
 };
 
+
+//
+// This derives from FormatMessage.
+//
+UCLASS(MinimalAPI)
+class UK2Node_FormatErrorMessage : public UK2Node_FormatMessage
+{
+	GENERATED_UCLASS_BODY()
+
+	// Setting this flag alters the behavior of FormatMessage, making it
+	// output to the log instead of to a pin.
+	//
+	virtual bool IsFormatErrorMessage() const override { return true; }
+};
+