WinApi 타이머 확장 문제.

30미만의 두 정수의 덧셈 안산 문제를 3초 간격으로 계속 출력 하라. 입력은 안받아도 되니 문제만 출력하라.


본인은 이렇게 문제를 풀었다.

#include <windows.h>
#include <time.h> //랜덤 함수를 초기화 할때 사용하기 위해 시간을 사용하려고.
void sansu();
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

HINSTANCE g_Inst;
LPCTSTR wndname=TEXT("GFP TIME");

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,int nShowCmd){
 HWND hWnd;
 MSG Message;
 WNDCLASS WndClass;
 g_Inst=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=wndname;
 WndClass.lpszMenuName=NULL;
 WndClass.style=CS_HREDRAW|CS_VREDRAW;
 RegisterClass(&WndClass);
 
 hWnd=CreateWindow(wndname,wndname,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,(HMENU)NULL,hInstance,NULL);
 
 ShowWindow(hWnd,nShowCmd);

 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 RECT table={100,100,400,120}; 

  static TCHAR sTime[128];
 
 srand((unsigned)time(NULL)); //랜덤 함수 초기화.
  switch(iMessage){
 case WM_DESTROY:
  KillTimer(hWnd,1);
  PostQuitMessage(0);
  return 0;
 case WM_CREATE:
  SetTimer(hWnd,1,3000,NULL);
  SendMessage(hWnd,WM_TIMER,1,0);
  return 0;
 case WM_TIMER:
  GetLocalTime(&st);
  wsprintf(sTime,TEXT("%d + %d"),rand()%29,rand()%29); //30미만의 정수중 난수를 돌림
  InvalidateRect(hWnd,&table,true);
  return 0;
 case WM_PAINT:
  hdc=BeginPaint(hWnd,&ps);
  TextOut(hdc,100,100,sTime,lstrlen(sTime));
  EndPaint(hWnd,&ps);
  return 0;
 }
 return (DefWindowProc(hWnd,iMessage,wParam,lParam));
}