endless edit control

1).well as the topic says im trying to create an edit control where when the edit box reaches a length of 50 lines it removes the top line and shifts the text up and therefore always has 50 lines in it

Code:

int boxlength=SendMessage(hedit,EM_GETLINECOUNT,0,0);
	int linelength=SendMessage(hedit,EM_LINELENGTH,0,0);	
	if(boxlength>49)
	{
		SendMessage (hedit, EM_SETSEL, 0, linelength);//select all of the first line
		SendMessage (hedit, EM_REPLACESEL, 0, (LPARAM) ((LPSTR) ""));//replace with nothing so i can move this line up
	}
	int ndx = GetWindowTextLength (hedit);
	message+="\r\n";	
	SendMessage (hedit, EM_SETSEL, (WPARAM)ndx, (LPARAM)ndx);
	SendMessage (hedit, EM_REPLACESEL, 0, (LPARAM) ((LPSTR) message.c_str()));

any ideas or suggestions? i think i may be going about this a little backwards... im guessing that by replacing the top line with a "" i can clear the \r\n so it will move... up i seem to be having some trouble doing this

2). how would i go about having a data entry box that clears after each enter? is this a special type of control or do i have to check my input and if i get a return clear the edit control?

i await your help and insight

1. See if the attached helps you...
2. You can subclass the edit control to catch the return then use SetWindowText() to blank the control.

the attached?

i manadged to implement the subclass though and its working well

Don't you just hate that when that happens!