DELPHI怎样模拟c++来创建窗口,该怎么解决

DELPHI怎样模拟c++来创建窗口
DELPHI怎样模拟c++来创建窗口
program Project1;

uses
 Windows;
var
  wc: WNDCLASSEX ;
  hMod: HINST ;
  hMainWnd: HWND ;
  w:integer ;
  mydc:hdc;
  a:pdevmode;

function adMainWndProc (hWnd:HWND; uMsgID:UINT; wParam:WPARAM; lParam:LPARAM):LRESULT; stdcall;
begin
  if uMsgID = HSHELL_WINDOWDESTROYED then {WM_DESTROY}
  begin
  PostQuitMessage (0) ;
  adMainWndProc := 0
  end
  else
  adMainWndProc := DefWindowProc (hWnd, uMsgID, wParam, lParam) ;
 end;

procedure adPumpMessage (hWnd: HWND); {消息循环}
var
  stmsg: MSG;
begin
  while GetMessage(stmsg, hWnd, 0, 0) do
  begin
  if stmsg.hwnd = 0 then Break;//
  TranslateMessage (stmsg) ;
  DispatchMessage (stmsg) ;
  end;
end;





begin
  hMod := GetModuleHandle (nil);
  with wc do
  begin
  cbSize := SizeOf (WNDCLASSEX) ; {此函数在system单元中}
  style := CS_HREDRAW or CS_VREDRAW ;
  lpfnWndProc := @adMainWndProc ;
  cbClsExtra := 0 ;
  cbWndExtra := 0 ;
  hInstance := hMod ;
  hIcon := LoadIcon (0, IDI_APPLICATION) ;
  hIconSm := hIcon ;
  hCursor := LoadCursor (0, IDC_ARROW) ;
  hbrBackground := COLOR_WINDOW + 1 ;
  lpszMenuName := nil ;
  lpszClassName := 'MyClass' ;
  end ;

  RegisterClassEx (wc) ;

  hMainWnd := CreateWindowEx (0, 'MyClass', 'First Window', WS_OVERLAPPEDWINDOW,200, 200, 600, 400, 0, 0, hMod, nil) ;

  ShowWindow (hMainWnd, SW_SHOW) ;
  UpdateWindow (hMainWnd) ;
  adPumpMessage (hMainWnd)
end. 我从网上找的，这样对吗？
还有，怎样在画个圆？
DC是什么？

[解决办法]

Delphi(Pascal) code

program Project1;uses  Forms,  Windows,  SysUtils,  Messages,  Dialogs;type  TMyForm = class(TObject)  private    winclass:WNDCLASSA;    hwindow:HWND;    Amsg:TMsg;    FAppName:string;    FWndproc:TFNAPCProc;    function winregister():Boolean;    procedure CreateMyWindow;  public    constructor Create;    destructor Destroy;override;    procedure WinCreate;    procedure MyRun;    procedure CreateButton(x,y:Integer;className,windowName:string);    property ApplicationName : string  read FAppName write FAppName;    property MyProcedure : TFNAPCProc read FWndproc write FWndproc;  end;const  AppName = 'Myclass';var  Mywindow:TMyForm;{ TMyForm }constructor TMyForm.Create;beginend;procedure TMyForm.CreateButton(x,y:Integer;className,windowName:string);var  hMyButton:HWND;begin  hMyButton:=CreateWindow(PAnsiChar(className),PAnsiChar(windowName),WS_VISIBLE or WS_Child or BS_Bitmap,    x,y,65,24,hwindow,0,system.MainInstance,nil);  ShowWindow(hMyButton,CmdShow);  ShowWindow(hMyButton,SW_SHOWNORMAL);  UpdateWindow(hMyButton);end;procedure TMyForm.CreateMyWindow;begin  hwindow := CreateWindowEx(WS_EX_CLIENTEDGE,PAnsiChar(FAppName),AppName,WS_OVERLAPPEDWINDOW,100,  100,600,400,0,0,SYSTEM.MainInstance,nil); // hwindow := CreateWindow(AppName,'创建窗口',WS_OVERLAPPED,CW_USEDEFAULT, //   CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,0,0,SYSTEM.MainInstance,nil);  if hwindow <> 0 then  begin    ShowWindow(hwindow,CmdShow);    ShowWindow(hwindow,SW_SHOWNORMAL);    UpdateWindow(hwindow);    CreateButton(75,175,'BUTTON','Mybutton1');    CreateButton(75,275,'BUTTON','Mybutton2');  end;end;destructor TMyForm.Destroy;begin  inherited;end;procedure TMyForm.MyRun;begin  while GetMessage(Amsg,0,0,0) do  begin    TranslateMessage(Amsg);    DispatchMessage(Amsg);  end;  Halt(Amsg.wParam);end;procedure TMyForm.WinCreate;begin  if winregister then  begin    CreateMyWindow;  end;end;function TMyForm.winregister: Boolean;begin  winclass.style := CS_HREDRAW or CS_VREDRAW;  winclass.lpfnWndProc := FWndproc;  winclass.cbClsExtra := 0;  winclass.cbWndExtra := 0;  winclass.hInstance := System.MainInstance;  winclass.hIcon := LoadIcon(0,IDI_APPLICATION);  winclass.hCursor := LoadCursor(0,IDC_ARROW);  winclass.hbrBackground := GetStockObject(WHITE_BRUSH);  winclass.lpszMenuName := nil;  winclass.lpszClassName := PChar(FAppName);  Result := RegisterClass(winclass)<> 0;end;function  WindowProc(hwnd:HWND;umsg:UINT;wParam:WPARAM;lParam:LPARAM):LRESULT;stdcall;export;var  dc:HDC;  ps:TPaintStruct;  r:TRect;  Curxy:TPoint;begin  WindowProc := 0 ;  case umsg of  WM_PAINT:  begin    dc := BeginPaint(hwnd,ps);    GetClientRect(hwnd,r);    DrawText(dc,'哈哈哈',-1,r,DT_SINGLELINE or DT_CENTER or DT_VCENTER);    EndPaint(hwnd,ps);    Exit;  end;  WM_DESTROY:  begin    PostQuitMessage(0);    Exit;  end;  WM_COMMAND:  begin    if GetCursorPos(Curxy) then      if Curxy.Y < 350 then      begin        ShowMessage('按钮1按下了');      end      else      begin        ShowMessage('按钮2按下了');      end;  end; end; WindowProc := DefWindowProc(hwnd,umsg,wParam,lParam); end;begin  Mywindow := TMyForm.Create;  Mywindow.ApplicationName := AppName;  Mywindow.FWndproc := TFNAPCProc(@WindowProc);  Mywindow.WinCreate;  try    Mywindow.MyRun;   // Mywindow.CreateButton;  finally    FreeAndNil(Mywindow);  end;  end.