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比较VC和Delphi的WinTest工程

 2006-02-04 14:00:15 来源:WEB开发网   
核心提示: 看过几篇关于VC和Delphi比较的文章,自己也有心写写代码试试,比较VC和Delphi的WinTest工程,我在VC6下新建了一个工程,叫WinTest, Delphi也同样可以不使用VCL写程序,像网上有人将Quake2的源码翻译成了Delphi的,代码如下:#include <windows.h>H
 

看过几篇关于VC和Delphi比较的文章,自己也有心写写代码试试,我在VC6下新建了一个工程,叫WinTest。代码如下:

#include <windows.h>

HWND hwndButton;
int cx, cy;

LRESULT CALLBACK MainWndPRoc (HWND hWindow, UINT nMsg, WPARAM wPrm, LPARAM lPrm)
{

 HDC dc;
 PAINTSTRUCT ps;
 RECT rc;
 switch (nMsg)
 {
 case WM_CREATE:
 {
  TEXTMETRIC tm;

  dc = GetDC (hWindow);
  SelectObject (dc, GetStockObject (SYSTEM_FIXED_FONT));
  GetTextMetrics (dc, &tm);
  cx = tm.tmAveCharWidth * 30;
  cy = (tm.tmHeight + tm.tmExternalLeading) * 2;
  ReleaseDC (hWindow, dc);

  hwndButton = CreateWindow (
   "button",
   "Click Here",
   WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
   0, 0, cx, cy,
   hWindow,
   (HMENU) 1,
   ((LPCREATESTRUCT) lPrm)->hInstance,
   NULL
   );

  return 0;
  break;
 }

 case WM_DESTROY:
 {
  PostQuitMessage (0);
  return 0;
  break;
 }

 case WM_PAINT:
 {
  dc = BeginPaint (hWindow, &ps);
  GetClientRect (hWindow, &rc);

  rc.bottom = rc.bottom / 2;
  DrawText (dc, "Hello, World!", -1, &rc,
  DT_SINGLELINE | DT_CENTER | DT_VCENTER);

  EndPaint (hWindow, &ps);
  return 0;
  break;
 }

 case WM_SIZE:
 {
  if (hwndButton && (wPrm == SIZEFULLSCREEN ||wPrm == SIZENORMAL))
  {
  rc.left = (LOWord(lPrm) - cx) / 2;
  rc.top = HIWORD(lPrm) * 3 / 4 - cy / 2;
  MoveWindow (hwndButton,rc.left, rc.top, cx, cy, TRUE);
  }
  return 0;
  break;
 }

 case WM_COMMAND:
 {
  if (LOWORD(wPrm) == 1 && HIWORD(wPrm) == BN_CLICKED &&
  (HWND) lPrm == hwndButton)
  {
  DestroyWindow (hWindow);
  }
  return 0;
  break;
 }
 }

 return DefWindowProc (hWindow, nMsg, wPrm, lPrm);
}

//winmain
int __stdcall WinMain (HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmd, int nShow)
{
 HWND hWindowMain;
 MSG MyMsg;

 WNDCLASSEX wcex;

 wcex.cbSize = sizeof(WNDCLASSEX);
 wcex.style  = CS_HREDRAW | CS_VREDRAW;
 wcex.lpfnWndProc = (WNDPROC)MainWndProc;
 wcex.cbClsExtra = 0;
 wcex.cbWndExtra = 0;
 wcex.hInstance = hInst;
 wcex.hIcon  = LoadIcon (NULL, IDI_application);
 wcex.hCursor = LoadCursor (NULL, IDC_ARROW);
 wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
 wcex.lpszClassName = "WinTestWin";
 wcex.hIconSm = LoadIcon (NULL, IDI_APPLICATION);


 RegisterClassEx (&wcex);

 hWindowMain = CreateWindow (
 "WinTestWin",
 "Hello",
 WS_OVERLAPPEDWINDOW,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 0,
 0,
 hInst,
 NULL
 );

 ShowWindow (hWindowMain, nShow);
 UpdateWindow (hWindowMain);

 while (GetMessage (&MyMsg, 0, 0, 0))
 {
 TranslateMessage (&MyMsg);
 DispatchMessage (&MyMsg);
 }
 return MyMsg.wParam;
}


其中选择Release方式编译,打开VC6的最小代码优化,编译生成的执行码为36.0KB,
然后将其翻译成Delphi代码,如下:

program WinTest;

uses
  Windows,Messages;

var
  hwndButton:HWND;
  cx,cy:Integer;

function MainWndProc (hWindow:HWND;nMsg:UINT;wPrm:WPARAM;lPrm:LPARAM):LRESULT;stdcall;
var
  dc:HDC;
 ps:PAINTSTRUCT;
 rc:TRect;
  tm:TEXTMETRIC;
  pctst:PCREATESTRUCT;
begin
  case nMsg of
   WM_CREATE:
   begin
    dc := GetDC (hWindow);
  SelectObject (dc, GetStockObject (SYSTEM_FIXED_FONT));
  GetTextMetrics (dc, tm);
  cx := tm.tmAveCharWidth * 30;
  cy := (tm.tmHeight + tm.tmExternalLeading) * 2;
  ReleaseDC (hWindow, dc);
    pctst:= PCREATESTRUCT(lPrm);
    hwndButton := CreateWindow(
   'button',
   'Click Here',
   WS_CHILD or WS_VISIBLE or BS_PUSHBUTTON,
   0, 0, cx, cy,
   hWindow,
   HMENU(1),
   pctst^.hInstance,
   nil
   );
    Result:=0;
    Exit;
   end;

   WM_DESTROY:
   begin
    PostQuitMessage(0);
    Result:=0;
    Exit;
   end;

   WM_PAINT:
   begin
  dc := BeginPaint (hWindow, ps);
  GetClientRect (hWindow, rc);

  rc.bottom := Round(rc.bottom / 2);
  DrawText (dc, 'Hello, World!', -1, rc,
  DT_SINGLELINE or DT_CENTER or DT_VCENTER);

  EndPaint (hWindow, ps);
  Result:= 0;
  Exit;
   end;

   WM_SIZE:
   begin
  if (hwndButton<>0) and (wPrm = SIZEFULLSCREEN)  or (wPrm = SIZENORMAL) then
  begin
  rc.left := Round((LOWORD(lPrm) - cx) / 2);
  rc.top := Round(HIWORD(lPrm) * 3 / 4 - cy / 2);
  MoveWindow (hwndButton,rc.left, rc.top, cx, cy, True);
  end;
  Result:= 0;
  Exit;
   end;

   WM_COMMAND:
   begin
  if (LOWORD(wPrm) = 1) and (HIWORD(wPrm) = BN_CLICKED) and
  (HWND(lPrm) = hwndButton) then
  begin
  DestroyWindow (hWindow);
  end;
  Result:= 0;
  Exit;
   end;

  end;

  Result:=DefWindowProc (hWindow, nMsg, wPrm, lPrm);

end;

//winmain
var
 hWindowMain:HWND;
 MyMsg:MSG;
 wcex:WNDCLASSEX;
begin
 wcex.cbSize := SizeOf(WNDCLASSEX);
 wcex.style := CS_HREDRAW or CS_VREDRAW;
 wcex.lpfnWndProc := @MainWndProc;
 wcex.cbClsExtra := 0;
 wcex.cbWndExtra := 0;
 wcex.hInstance := MainInstance;
 wcex.hIcon := LoadIcon (0, IDI_APPLICATION);
 wcex.hCursor := LoadCursor (0, IDC_ARROW);
 wcex.hbrBackground := HBRUSH(COLOR_WINDOW+1);
 wcex.lpszClassName := 'WinTestWin';
 wcex.hIconSm := LoadIcon (0, IDI_APPLICATION);

 RegisterClassEx (wcex);

 hWindowMain := CreateWindow (
 'WinTestWin',
 'Hello',
 WS_OVERLAPPEDWINDOW,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 0,
 0,
 MainInstance,
 nil
 );

 ShowWindow (hWindowMain, CmdShow);
 UpdateWindow (hWindowMain);

 while GetMessage (MyMsg, 0, 0, 0)=True do
 begin
 TranslateMessage (MyMsg);
 DispatchMessage (MyMsg);
 end;
 
end.

最后发现Delphi生成的代码仅有16.5k,比VC小了一半以上。说明Delphi有一个不错的编译器,加之VCL的可视化功能,应该是一个很好的开发工具。 以我来看,Delphi开发大型系统是一点问题没有的,甚至可能性能将超过VC,只是VCL的高封装层次使得使用VCL的程序通常都大,但开发效率却不是VC可以比的。 Delphi也同样可以不使用VCL写程序,像网上有人将Quake2的源码翻译成了Delphi的,效果与C写的相差无几。


Tags:比较 VC Delphi

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