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开发学院软件开发Delphi 最小的程序 阅读

最小的程序

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核心提示:PRogram testwindow;uses Windows, Messages;var WinClass: TWndClassA; Inst, Handle, Button1, Label1, Edit1: Integer; Msg: TMsg; hFont: Integer;{ Checks if t

PRogram testwindow;

uses
  Windows,
  Messages;

var
  WinClass: TWndClassA;
  Inst, Handle, Button1, Label1, Edit1: Integer;
  Msg: TMsg;
  hFont: Integer;

{ Checks if typed passWord is 'Amigreen' and shows Message }
procedure CheckPassword;
var
  Textlength: Integer;
  Text: PChar;
begin
  TextLength := GetWindowTextLength(Edit1);
  if TextLength = 8 then
  begin
   GetMem(Text, TextLength + 1);
   GetWindowText(Edit1, Text, TextLength + 1);
   if Text = 'Amigreen' then
   begin
    MessageBoxA(Handle, 'Password is correct.', 'Password check', MB_OK);
    FreeMem(Text, TextLength + 1);
    Exit;
   end;
  end;
  MessageBoxA(Handle, 'Password is incorrect.', 'Password check', MB_OK);
end;

{ Custom WindowProc function }
function WindowProc(hWnd, uMsg, wParam, lParam: Integer): Integer; stdcall;
begin
  Result := DefWindowProc(hWnd, uMsg, wParam, lParam);
  { Checks for messages }
  if (lParam = Button1) and (uMsg = WM_COMMAND) then
   CheckPassword;
  if uMsg = WM_DESTROY then
   Halt;
end;

begin
  { ** Register Custom WndClass ** }
  Inst := hInstance;
  with WinClass do
  begin
   style        := CS_CLASSDC or CS_PARENTDC;
   lpfnWndProc     := @WindowProc;
   hInstance      := Inst;
   hbrBackground    := color_btnface + 1;
   lpszClassname    := 'AG_TESTWINDOW';
   hCursor       := LoadCursor(0, IDC_ARROW);
  end; { with }
  RegisterClass(WinClass);

  { ** Create Main Window ** }
  Handle := CreateWindowEx(WS_EX_WINDOWEDGE, 'AG_TESTWINDOW', 'Amigreen TestWindow 1.00',
              WS_VISIBLE or WS_SIZEBOX or WS_CAPTION or WS_SYSMENU,
              363, 278, 305, 65, 0, 0, Inst, nil);
  { ** Create a button ** }
  Button1 := CreateWindow('Button', 'OK', WS_VISIBLE or WS_CHILD or BS_PUSHLIKE or BS_TEXT,
              216, 8, 75, 25, handle, 0, Inst, nil);
  { ** Create a label (static) ** }
  Label1 := Createwindow('Static', ', WS_VISIBLE or WS_CHILD or SS_LEFT,
        8, 12, 76, 13, Handle, 0, Inst, nil);

  { ** Create an edit field ** }
  Edit1 := CreateWindowEx(WS_EX_CLIENTEDGE, 'Edit', ', WS_CHILD or WS_VISIBLE or
              WS_BORDER or ES_PASSWORD, 88, 8, 121, 21, Handle, 0, Inst, nil);

  { ** Create Font Handle ** }
  hFont := CreateFont(-11, 0, 0, 0, 400, 0, 0, 0, DEFAULT_CHARSET,
            OUT_DEFAULT_PRECIS, CLip_DEFAULT_PRECIS, DEFAULT_QUALITY,
            DEFAULT_PITCH or FF_DONTCARE, 'MS Sans Serif');

  { Change fonts }
  if hFont <> 0 then
  begin
   SendMessage(Button1, WM_SETFONT, hFont, 0);
   SendMessage(Label1, WM_SETFONT, hFont, 0);
   SendMessage(Edit1, WM_SETFONT, hFont, 0);
  end;
  { Change label (static) text }
  SetWindowText(Label1, 'Enter password:');
  { Set the focus to the edit control }
  SetFocus(Edit1);

  UpdateWindow(Handle);

  { ** Message Loop ** }
  while(GetMessage(Msg, Handle, 0, 0)) do
  begin
   TranslateMessage(msg);
   DispatchMessage(msg);
  end; { with }
end.

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