كود لبرنامج معمول بالابى اى

السلام عليكم ورحمة الله وبركاتة

انا حاولت اكتبة فى قسم الابى اى منفعش مش عارف قافلين القسم لية

المهم دة كود لبرنامج عجبنى جدا فقلت اعرضة للفايدة

على هيئة ساعة رقمية

الكود من كتاب اجنبى

يا ريت لو حد يحط علية تعليق حتى نتمكن من فهمة

وشكرا

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صورة البرنامج

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#include <windows.h>

#define ID_TIMER	1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
					PSTR szCmdLine, int iCmdShow)
{
	 static TCHAR szAppName[] = TEXT ("DigClock");
	 HWND		 hwnd;
	 MSG		  msg;
	 WNDCLASS	 wndclass;

	 wndclass.style		 = CS_HREDRAW | CS_VREDRAW;
	 wndclass.lpfnWndProc   = WndProc;
	 wndclass.cbClsExtra	= 0;
	 wndclass.cbWndExtra	= 0;
	 wndclass.hInstance	 = hInstance;
	 wndclass.hIcon		 = LoadIcon (NULL, IDI_APPLICATION);
	 wndclass.hCursor	   = LoadCursor (NULL, IDC_ARROW);
	 wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
	 wndclass.lpszMenuName  = NULL;
	 wndclass.lpszClassName = szAppName;

	 if (!RegisterClass (&wndclass))
	 {

		  MessageBox (NULL, TEXT ("Program requires Windows NT!"), 
					  szAppName, MB_ICONERROR);
		  return 0;
	 }

	 hwnd = CreateWindow (szAppName, TEXT ("Digital Clock"),
						  WS_OVERLAPPEDWINDOW,
						  CW_USEDEFAULT, CW_USEDEFAULT,
						  CW_USEDEFAULT, CW_USEDEFAULT,
						  NULL, NULL, hInstance, NULL);

	 ShowWindow (hwnd, iCmdShow);
	 UpdateWindow (hwnd);

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

void DisplayDigit (HDC hdc, int iNumber)
{
	 static BOOL  fSevenSegment [10][7] = {
						 1, 1, 1, 0, 1, 1, 1,	 // 0
						 0, 0, 1, 0, 0, 1, 0,	 // 1
						 1, 0, 1, 1, 1, 0, 1,	 // 2
						 1, 0, 1, 1, 0, 1, 1,	 // 3
						 0, 1, 1, 1, 0, 1, 0,	 // 4
						 1, 1, 0, 1, 0, 1, 1,	 // 5
						 1, 1, 0, 1, 1, 1, 1,	 // 6
						 1, 0, 1, 0, 0, 1, 0,	 // 7
						 1, 1, 1, 1, 1, 1, 1,	 // 8
						 1, 1, 1, 1, 0, 1, 1 };  // 9
	 static POINT ptSegment [7][6] = {
						  7,  6,  11,  2,  31,  2,  35,  6,  31, 10,  11, 10,
						  6,  7,  10, 11,  10, 31,   6, 35,   2, 31,   2, 11,
						 36,  7,  40, 11,  40, 31,  36, 35,  32, 31,  32, 11,
						  7, 36,  11, 32,  31, 32,  35, 36,  31, 40,  11, 40,
						  6, 37,  10, 41,  10, 61,   6, 65,   2, 61,   2, 41,
						 36, 37,  40, 41,  40, 61,  36, 65,  32, 61,  32, 41,
						  7, 66,  11, 62,  31, 62,  35, 66,  31, 70,  11, 70 };
	 int		  iSeg;

	 for (iSeg = 0; iSeg < 7; iSeg++)
		  if (fSevenSegment [iNumber][iSeg])
			   Polygon (hdc, ptSegment [iSeg], 6);
}

void DisplayTwoDigits (HDC hdc, int iNumber, BOOL fSuppress)
{
	 if (!fSuppress || (iNumber / 10 != 0))
		  DisplayDigit (hdc, iNumber / 10);
	 OffsetWindowOrgEx (hdc, -42, 0, NULL);
	 DisplayDigit (hdc, iNumber % 10);
	 OffsetWindowOrgEx (hdc, -42, 0, NULL);
}

void DisplayColon (HDC hdc)
{
	 POINT ptColon [2][4] = { 2,  21,  6,  17,  10, 21,  6, 25,
							  2,  51,  6,  47,  10, 51,  6, 55 };

	 Polygon (hdc, ptColon [0], 4);
	 Polygon (hdc, ptColon [1], 4);

	 OffsetWindowOrgEx (hdc, -12, 0, NULL);
}

void DisplayTime (HDC hdc, BOOL f24Hour, BOOL fSuppress)
{
	 SYSTEMTIME st;

	 GetLocalTime (&st);

	 if (f24Hour)
		  DisplayTwoDigits (hdc, st.wHour, fSuppress);
	 else
		  DisplayTwoDigits (hdc, (st.wHour %= 12) ? st.wHour : 12, fSuppress);

	 DisplayColon (hdc);
	 DisplayTwoDigits (hdc, st.wMinute, FALSE);
	 DisplayColon (hdc);
	 DisplayTwoDigits (hdc, st.wSecond, FALSE);
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	 static BOOL   f24Hour, fSuppress;
	 static HBRUSH hBrushRed;
	 static int	cxClient, cyClient;
	 HDC		   hdc;
	 PAINTSTRUCT   ps;
	 TCHAR		 szBuffer [2];

	 switch (message)
	 {
	 case WM_CREATE:
		  hBrushRed = CreateSolidBrush (RGB (255, 0, 0));
		  SetTimer (hwnd, ID_TIMER, 1000, NULL);

												  // fall through

	 case WM_SETTINGCHANGE:
		  GetLocaleInfo (LOCALE_USER_DEFAULT, LOCALE_ITIME, szBuffer, 2);
		 // f24Hour = (szBuffer[0] == `1');

		  GetLocaleInfo (LOCALE_USER_DEFAULT, LOCALE_ITLZERO, szBuffer, 2);
		 // fSuppress = (szBuffer[0] == `0');

		  InvalidateRect (hwnd, NULL, TRUE);
		  return 0;

	 case WM_SIZE:
		  cxClient = LOWORD (lParam);
		  cyClient = HIWORD (lParam);
		  return 0;

	 case WM_TIMER:
		  InvalidateRect (hwnd, NULL, TRUE);
		  return 0;

	 case WM_PAINT:
		  hdc = BeginPaint (hwnd, &ps);

		  SetMapMode (hdc, MM_ISOTROPIC);
		  SetWindowExtEx (hdc, 276, 72, NULL);
		  SetViewportExtEx (hdc, cxClient, cyClient, NULL);

		  SetWindowOrgEx (hdc, 138, 36, NULL);
		  SetViewportOrgEx (hdc, cxClient / 2, cyClient / 2, NULL);
		  SelectObject (hdc, GetStockObject (NULL_PEN));
		  SelectObject (hdc, hBrushRed);

		  DisplayTime (hdc, f24Hour, fSuppress);

		  EndPaint (hwnd, &ps);
		  return 0;

	 case WM_DESTROY:
		  KillTimer (hwnd, ID_TIMER);
		  DeleteObject (hBrushRed);
		  PostQuitMessage (0);
		  return 0;
	 }
	 return DefWindowProc (hwnd, message, wParam, lParam);
}