4 .
: Windows .
: IBM Pentium 166 .
: Windows 95, 98 NT, Delphi 4 .
:
- Windows;
- , ;
- .
1. Windows . 21 , .
. 21
| . | Windows | , |
| WM_LBUTTONDOWN | ||
| WM_LBUTTONDBLCLK | , | |
| WM_RBUTTONUP | (BorderStyle) | |
| WM_MOUSEMOVE | ||
| WM_RBUTTONDBLCLK | ||
| WM_KEYDOWN | є, | |
| WM_KEYUP |
2. , , , .
3. . 22, , .
. 22
| . | , | , |
| TLabel | ||
| TLabel | ||
| TLabel | ||
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.1. Windows , Windows . , , ( , , ..) Windows.
Windows , :
- Handle , ;
- Msg (16 ) () , ;
- lParam wParam (16 32 ) .
, , Msg WM_LBUTTONDOWN, wParam , lParam ( X 16- , Y 16- ).
, Msg WM_KEYDOWN, wParam ASCII , lParam - .
lParam wParam , . , Delphi, Message. , TWMMouse, :
Type TWMMouse = record
Msg: Cardinal; { wParam}
Keys: Longint; { wParam}
Case Integer of
0: XPos: SmalInt; { X Y}
YPos: SmalInt;
1: Pos: TSmallPoint; { ]
Result: LongInt; { }
end;
Message TWMKey
TWMKey = record
Msg: Cardinal; { }
CharCode: Word; {ASCII }
Unused: Word; { }
KeyData: Longint; { }
Result: Longint; { }
end;
Windows :
procedure Handle_Name (var Msg: TMessageType); message WM_XXX;
HandlerName ; Msg , TMessageType - , , message , , WM_XXX - , Windows.
: , .
Type
TForm1 = class (TForm)
private
procedure WMRButtuonDown (var Msg: TWMMouse);
message WM_RbuttonDown;
.
end; {TForm1}
implementation .
procedure TForm1.WmrButtonDown(var Msg: TWMMouse);
begin
MessageDlg( ,mtInformation,[mbOk],0);
end;
Delphi , , , . . , .
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.2. Delphi , . OnMessage Application, . OnMessage, , .
. OnMessage (MainF).
type
TForm1 = class (TForm)
private
procedure ProceedMessage (var Msg:TMsg; var Handled: Boolean);
published
procedure FormCreate (Sender: TObject);
end; {Form1}
..
implementation
procedure TForm1.FormCreate (Sender: TObject);
begin
Application.OnMessage:=ProceedMessage;
end;
procedure TForm1.ProceedMessage (var Msg:TMsg; var Handled: Boolean);
begin
Handled:=False;
If Msg.Message = WM_LBUTTONDBLCLK then
begin
MessageDlg( ,mtInformation,[mbOk],0);
Handled:=True;
end;
end;
, , .
, TMsg, Windows:
tagMSG = packed record
hwnd: HWND;
message: UINT;
wParam: WPARAM;
lParam: LPARAM;
time: DWORD;
pt: TPoint;
end;
TMsg = tagMSG;
hwnd , wParam lParam .
, , :
with Msg do
begin
x:=lo(Msg.lParam); { X}
lParam:= lParam shr 16; { 16 }
{ TCoord, Y ]
//y:=lo(TCoord(lParam).ypos);
y:=lo(lParam); { Y}
MessageDlg(' '+IntTostr(x)+:IntToStr(y)+' ',mtInformation,[mbOk],0);
end;
TCoord :
type tCoord = record
xpos:word;
ypos:word;
end;
, - , .
:
if Msg.hwnd = Form3.Handle then
begin
if Msg.Message = WM_KeyDown then
.
.3. Delphi Windows, . , :
- ;
- .
, . Windows 1024 . WM_APP, Messages, .
:
WM_MYMESSAGE = WM_APP+400;
, . (wParam, lParam ..) TMessage.
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( ) , , . , Delphi File½New Unit, . interface , Messages.
, , . :
- protected ;
- ;
- var ;
- , implementation ;
CM_CHANGECOLOR.
type
TMyForm = class (TForm)
protected
procedure CMChangeColor (var Msg: TMessage); message CM_CHANGECOLOR;
..
end; {TMyForm}
implementation
procedure TMyForm.CMChangeColor(var Msg: TMessage);
begin
Color:=Msg.lParam;
Inherited;
end;
, , , , , . Events , , .
Windows API SendMessage PostMessage.
SendMessage PostMessage , , SendMessage , , PostMessage , .
SendMessage PostMessage , :
BOOL PostMessage(
HWND hWnd, // ,
UINT Msg, //
WPARAM wParam, //
LPARAM lParam //
);
LRESULT SendMessage(
HWND hWnd, // ,
UINT Msg, //
WPARAM wParam, //
LPARAM lParam //
);
: , , lParam , .
procedure TForm2.FormClick(Sender: TObject);
var color:integer;
begin
color:=Random(10000);
PostMessage(Form3.Handle,WM_MYMESSAGE,0,color);
end;
, , , , , , , .
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1. Windows ?
2. ?
3. Ka ?
4. ?
5. ?
6. ?
7. SendMessage PostMessage?
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