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How to send a simulated key press to the active control

Discussion in 'Delphi Components' started by AdminDF, Apr 10, 2013.

  1. AdminDF
    Online

    AdminDFAdminDF is a Verified Member DelphiFan Administrator Staff Member DF Staff

    Code:
    procedure PostKeyEx32(key: Word; const shift: TShiftState;
      specialkey: Boolean);
    type
      TShiftKeyInfo = record
        shift: Byte;
        vkey: Byte;
      end;
      ByteSet = set of 0..7;
    const
      shiftkeys: array [1..3] of TShiftKeyInfo = (
        (shift: Ord(ssCtrl) ; vkey: VK_CONTROL),
        (shift: Ord(ssShift) ; vkey: VK_SHIFT),
        (shift: Ord(ssAlt) ; vkey: VK_MENU)
      );
    var
      flag: DWORD;
      bShift: ByteSet absolute shift;
      j: Integer;
    begin
      for j := 1 to 3 do
      begin
        if shiftkeys[j].shift in bShift then
          keybd_event(
            shiftkeys[j].vkey, MapVirtualKey(shiftkeys[j].vkey, 0), 0, 0
        );
      end;
      if specialkey then
        flag := KEYEVENTF_EXTENDEDKEY
      else
        flag := 0;
    
      keybd_event(key, MapvirtualKey(key, 0), flag, 0);
      flag := flag or KEYEVENTF_KEYUP;
      keybd_event(key, MapvirtualKey(key, 0), flag, 0);
    
      for j := 3 downto 1 do
      begin
        if shiftkeys[j].shift in bShift then
          keybd_event(
            shiftkeys[j].vkey,
            MapVirtualKey(shiftkeys[j].vkey, 0),
            KEYEVENTF_KEYUP,
            0
          );
      end;
    end;

    Usage:
    Code:
    procedure TForm1.SpeedButton1Click(Sender: TObject) ;
    begin
      // Simulate PRINTSCREEN - snapshot of the full screen
      PostKeyEx32(VK_SNAPSHOT, [], False) ;
    
      // Simulate PRINTSCREEN - snapshot of the active window
      PostKeyEx32(VK_SNAPSHOT, [ssAlt], False) ;
    
      // Simulate Spacebar key
      PostKeyEx32(VK_space, [], False) ;( I changed this)
    
      // Simulate Alt+F4 - close active window
      PostKeyEx32(VK_F4, [ssAlt], False) ;
    end;
     

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