Timer(윈도우 api)소스

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
HINSTANCE g_hInst;
LPCTSTR lpszClass = TEXT("MyTimer");

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nCmdShow)
{
 HWND hWnd;
 MSG Message;
 WNDCLASS WndClass;
 g_hInst = hInstance;

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

 hWnd = CreateWindow(lpszClass, lpszClass, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, (HMENU)NULL, hInstance, NULL);
 ShowWindow(hWnd, nCmdShow);

 while(GetMessage(&Message, NULL, 0, 0)) {
  TranslateMessage(&Message);
  DispatchMessage(&Message);
 }

 return (int)Message.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage, WPARAM wParam, LPARAM lParam)
{
 HDC hdc;
 PAINTSTRUCT ps;
 SYSTEMTIME st;
 static TCHAR sTime[128];
 static RECT rt = {100, 100, 400, 120};

 switch(iMessage) {
  case WM_CREATE:
   SetTimer(hWnd, 1, 1000, NULL);
   SendMessage(hWnd, WM_TIMER, 1, 0);
   return 0;
  case WM_TIMER:
   GetLocalTime(&st);
   wsprintf(sTime, TEXT("지금 시간은 %d:%d:%d입니다"), st.wHour, st.wMinute, st.wSecond);
   InvalidateRect(hWnd, &rt, TRUE);
   return 0;
  case WM_PAINT:
   hdc = BeginPaint(hWnd, &ps);
   TextOut(hdc, 100, 100, sTime, lstrlen(sTime));
   EndPaint(hWnd, &ps);
   return 0;
  case WM_DESTROY:
   KillTimer(hWnd, 1);
   PostQuitMessage(0);
   return 0;
 }
 return (DefWindowProc(hWnd, iMessage, wParam, lParam));
}