看過幾篇關于VC和Delphi比較的文章，自己也有心寫寫代碼試試，我在VC6下新建了一個工程，叫WinTest。代碼如下：

#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;
}

其中選擇Release方式編譯，打開VC6的最小代碼優化，編譯生成的執行碼為36.0KB，
然后將其翻譯成Delphi代碼，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.

最后發現Delphi生成的代碼僅有16.5k，比VC小了一半以上。說明Delphi有一個不錯的編譯器，加之VCL的可視化功能，應該是一個很好的開發工具。 以我來看，Delphi開發大型系統是一點問題沒有的，甚至可能性能將超過VC，只是VCL的高封裝層次使得使用VCL的程序通常都大，但開發效率卻不是VC可以比的。 Delphi也同樣可以不使用VCL寫程序，像網上有人將Quake2的源碼翻譯成了Delphi的，效果與C寫的相差無幾。