체크 박스 실습 및 창 없어 져쎴다 사라지기

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);// LRESULT (LONG_PTR) //CALLBACK(인자값을 주면 필요로할때 호출해서 쓰겟다)
HINSTANCE g_hInst;
HWND hWndMain;
LPCTSTR lpszClass=TEXT("Check");
int nCmdShow;

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_BTNFACE+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);// 등록

 hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,   //CreateWindow 윈도생성
  CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
  NULL,(HMENU)NULL,hInstance,NULL);
 ShowWindow(hWnd,SW_NORMAL);

 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; //DC의핸들
 PAINTSTRUCT ps; // PAINTSTRUCT 펜인트 구조체
 static HWND c1,c2,c3,c4; //static준이유 돌아갈때 마다 초기화  C1-4 핸들값임
 static BOOL bEllipse = FALSE;
 switch (iMessage) {   //iMessage ID 값 반환
 case WM_CREATE: // CONTROLL 을만듬
  c1=CreateWindow(TEXT("button"),TEXT("Draw Ellipse?"),WS_CHILD | WS_VISIBLE |   //CreateWindow 윈도우생성
   // WS_CHILD 자식 윈도우
   BS_CHECKBOX,20,20,160,25,hWnd,(HMENU)0,g_hInst,NULL);
  //BS_CHECKBOX 체크박스 C1체크 박스의 핸들값      (HMENU)0---> 체크박스 식별자: 이름으로지어줘도 됨
  c2=CreateWindow(TEXT("button"),TEXT("Good bye Message?"),WS_CHILD | WS_VISIBLE |
   BS_AUTOCHECKBOX,20,50,160,25,hWnd,(HMENU)1,g_hInst,NULL);
  c3=CreateWindow(TEXT("button"),TEXT("3State"),WS_CHILD | WS_VISIBLE | BS_3STATE,
   20,80,160,25,hWnd,(HMENU)2,g_hInst,NULL);
  c4=CreateWindow(TEXT("button"),TEXT("Auto 3State"),WS_CHILD | WS_VISIBLE |
   BS_AUTO3STATE,20,110,160,25,hWnd,(HMENU)3,g_hInst,NULL);  //BS_AUTO3STATE     BS_3STATE 3상태 체크박스
  
 case WM_COMMAND: //체크하는동작하면발생
  switch (LOWORD(wParam)) {
 case 0:
  bEllipse=(BOOL)(SendMessage(c1,BM_GETCHECK,0,0)==BST_CHECKED);
  //C1에 BM_GETCHECK 체크상태를 보냄(니 체크상태가 뭐야?) -- BST_CHECKED 체크안된걸로 설정(체크 않되있어)
  if (SendMessage(c1,BM_GETCHECK,0,0)==BST_UNCHECKED) {     // IF  체크일경우
   SendMessage(c1,BM_SETCHECK,BST_CHECKED,0);
   bEllipse = TRUE; //동작설정 원을그려줄것인가
  } else {            // 체크가아닐경우   
   SendMessage(c1,BM_SETCHECK,BST_UNCHECKED,0);
   bEllipse = FALSE;
  }
  InvalidateRect(hWnd, NULL, TRUE);//InvalidateRect 무효화영역(가려진영역) 가려진영역을 않보이게하라(TRUE)
  break;
 case 2:
  if (SendMessage(c3,BM_GETCHECK,0,0)==BST_UNCHECKED)  // 던저진 체크상태 비교
   //BM_GETCHECK 체크상태 물어봄 // SendMessage :GETCHECK 값을 받음
   SendMessage(c3,BM_SETCHECK,BST_CHECKED,0); // 체크상태확인
  else
   if (SendMessage(c3,BM_GETCHECK,0,0)==BST_INDETERMINATE)
    SendMessage(c3,BM_SETCHECK,BST_UNCHECKED,0);
   else
    SendMessage(c3,BM_SETCHECK,BST_INDETERMINATE,0);
  
  if (SendMessage(c2,BM_GETCHECK,0,0)==BST_CHECKED) {
   MessageBox(hWnd,TEXT("Good bye"),TEXT("Check"),MB_OK);//3상태 버튼을 누르면.
  }
  ShowWindow(hWnd,SW_HIDE);//창을숨김
    Sleep(2000);//  2초간 딜레이 (쉼)
  ShowWindow(hWnd,SW_NORMAL);// 창을 다시 보여줌
  break;
  }
  return 0;
 case WM_PAINT:
  hdc=BeginPaint(hWnd,&ps);
  if (bEllipse == TRUE) {
   Ellipse(hdc,200,100,400,200); // 사각형안의 원
  } else {
   Rectangle(hdc,200,100,400,200);

  }
  EndPaint(hWnd, &ps);
  return 0;
 case WM_DESTROY:
  if (SendMessage(c2,BM_GETCHECK,0,0)==BST_CHECKED) {
   MessageBox(hWnd,TEXT("Good bye"),TEXT("Check"),MB_OK);
  }
  PostQuitMessage(0);
  return 0;
 }
 return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}