Get Data from keyboard event parameter

I am catching keyboard event of MLTE.
I want to get the value of event parameter coming from keyboard event so
that I can
compare the value with Return key.
 Following is the code for it. 
 But not getting proper value.
please suggest.

EventRef     theTextEvent;
UniChar      *text;
UInt32    actualSize; 
void *outData;
GetEventParameter (theTextEvent,kEventUnicodeForKeyEvent,
			typeCString, NULL, 0, &actualSize, outData);

text = (UniChar*) NewPtr(actualSize);
GetEventParameter (theTextEvent, kEventUnicodeForKeyEvent,

				typeUnicodeText, NULL, actualSize, NULL, text);
			text = (UniChar*) NewPtr(actualSize);

Regards

-Hemant