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Delphi »ñÈ¡¾ä±ú sendmessage

²éÕÒÁíÍâÒ»¸ö´°¿ÚµÄ¾ä±ú£º handle := FindWindow(nil,PChar('´°¿ÚµÄ±êÌâ'));//²éµ½´°Ìå¾ä±ú
²éÕÒ×Ó´°Ì壺childHandle := FindWindowEx(handle,0,'×Ó´°ÌåÀà','×Ó´°Ìå±êÌâ');
ÁíÍâÓиöö¾Ù×Ó´°ÌåµÄAPI£¬EnumChildWindows(Ö÷´´Ìå¾ä±ú,@»Øµ÷º¯Êý,Óû§²ÎÊý);
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function EnumChildProc(ahWND:HWND; param:LPARAM):boolean; stdcall;
sendmessage(handle,message,wl,rl)
    unit     Unit1;    
   
    interface    
   
    uses     Windows,     Messages,Tlhelp32,     SysUtils,     Classes,     Graphics,     Controls,     Forms,     Dialogs,     StdCtrls;
   
    type
        TForm1     =     class(TForm)
      procedure FormCreate(Sender: TObject);
     
        private
        {     Private     declarations     }    
        public    
        {     Public     declarations     }
        end;    
    var     Form1:     TForm1;
    implementation
    {$R     *.DFM}
   
    procedure TForm1.FormCreate(Sender: TObject);
var a,b:PAnsiChar;
h:HWND;
begin
h:= FindWindow(nil,'abc.txt -


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