Reading Contents of Edit Control up to a Certain Character

Once you find the window for the edit control you are looking for, how do you read the text in it character by character? I do not want to read it into a buffer since the text changes rapidly and I have to stream it all. With the buffer, I would have to wait until the total number of characters are found. This is what I have now:

Code:

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SendMessage(hwnd, WM_GETTEXT, 80, ((LPARAM) message));

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An EN_CHANGE notification is sent to the parent of the edit control each time a change is made which can be used to read input character by character.