WIN32 API기반으로 간단히 구현해 본 StopWatch

API를 이용하여 간단하게 교육용 소스로 스톱워치를 만들어 보았다.

타이머를 하나 생성해서 돌려주면

타이머 이벤트가 발생할 때 마다 undercomma (1/100초)가 하나씩 증가하고

이넘들이 100개 모이면 1초 , 1초가 60개 모이면 다시 1분이 증가하는 순서이다.

소스는 간단함..

문제점이 있다면 실제 시간하고 맞지 않는다는것이다.
(실제시간 1초보다 타이머상의 1초가 증가하는데 더 오래걸린다)

//============================================================================================

#include <windows.h>

#include <stdio.h>

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

HINSTANCE g_hInst;

HWND hWndMain;

LPCTSTR lpszClass=TEXT("StopWatch");

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)(COLOR_WINDOW+1);

 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,300,220,

  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;

   HFONT font, oldfont;

   static int min, sec, undercomma; // 분, 초, 0.01초

   switch (iMessage) {

     case WM_CREATE:

      hWndMain=hWnd;

      CreateWindow(TEXT("button"),TEXT("START"),WS_CHILD|WS_VISIBLE|

       BS_PUSHBUTTON,20,150,80,30,hWnd,(HMENU)0,g_hInst,NULL);

      CreateWindow(TEXT("button"),TEXT("STOP"),WS_CHILD|WS_VISIBLE|

       BS_PUSHBUTTON,105,150,80,30,hWnd,(HMENU)1,g_hInst,NULL);

      CreateWindow(TEXT("button"),TEXT("EXIT"),WS_CHILD|WS_VISIBLE|

       BS_PUSHBUTTON,190,150,80,30,hWnd,(HMENU)2,g_hInst,NULL);

    return 0;

  

   case WM_TIMER:

      undercomma+=5;

      if(undercomma >= 100) { sec++; undercomma=0; }

      if(sec >= 60) { min++; sec=0; }

      InvalidateRect(hWnd, NULL, TRUE);

    return 0; 

   case WM_PAINT:

      char szTxt[16];

      hdc=BeginPaint(hWnd, &ps);

      font=CreateFont(60,0,0,0,0,0,0,0,HANGEUL_CHARSET,0,0,0,0,"돋움");

      oldfont=(HFONT)SelectObject(hdc,font);

      sprintf(szTxt, "%02d:%02d.%02d",min, sec, undercomma);

      TextOut(hdc, 20, 40, szTxt, strlen(szTxt));

      SelectObject(hdc,oldfont);

      DeleteObject(font);

      EndPaint(hWnd, &ps);

    return 0;

   case WM_COMMAND:

    switch(LOWORD(wParam)) {

    case 0:  // START button clicked

       min = 0;

       sec = 0;

     undercomma = 0;

       SetTimer(hWnd, 3355, 50, NULL);

       break;

    case 1:  // STOP button clicked

       KillTimer(hWnd, 3355);

       break;

    case 2:  // EXIT button clicked

       PostQuitMessage(0);

       break;

    }

    return 0;

   case WM_DESTROY:

      PostQuitMessage(0);

      return 0;

   }

   return(DefWindowProc(hWnd,iMessage,wParam,lParam));

}