Delphi SendMessage of string

This is how you sendmessage a string passing it either WParam or LParam.

procedure MySenderFunction;
var
 sText: String;   
begin
    sText := 'This is a test'.
     SendMessage(Handle, WM_MYMESSAGE, Integer(@sText), 0) ;
end;


This is how you get the parameter being passed.

procedure MySenderFunction(Msg: TMessage);
var
    sText: String;
begin
    sText := PString(Msg.WParam)^;
end;