nsakura GFP

LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage,WPARAM wParam, LPARAM lParam){
 HDC hdc;
 PAINTSTRUCT ps;

 static BOOL drawflag=false;

 static HWND check,check1;

 switch(iMessage){
 case WM_CREATE:
  CreateWindow(TEXT("button"),TEXT("GFP Button 0"),WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,20,20,500,25,hWnd,(HMENU)GFPBUTTON,wndnsakura,NULL);
 
  CreateWindow(TEXT("button"),TEXT("GFP Button 1"),WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,20,50,500,25,hWnd,(HMENU)GFPBUTTON1,wndnsakura,NULL);
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

  check=CreateWindow(TEXT("button"),TEXT("Draw Ellipse"),WS_CHILD | WS_VISIBLE | BS_CHECKBOX,20,80,500,25,hWnd,(HMENU)GFPCHECK,wndnsakura,NULL);

  check1=CreateWindow(TEXT("button"),TEXT("Good bye Message"),WS_CHILD | WS_VISIBLE | BS_AUTOCHECKBOX,20,110,500,25,hWnd,(HMENU)GFPCHECK1,wndnsakura,NULL);

  return 0;
 case WM_COMMAND:
  switch(LOWORD(wParam)){
  case GFPBUTTON:
   MessageBox(hWnd,TEXT("GFP Button 0"),TEXT("GFP Button 0"),MB_OK);
   break;
  case GFPBUTTON1:
   MessageBox(hWnd,TEXT("GFP Button 1"),TEXT("GFP Button 1"),MB_OK);
   break;
  case GFPCHECK:
   if(SendMessage(check,BM_GETCHECK,0,0)==BST_UNCHECKED){
    SendMessage(check,BM_SETCHECK,BST_CHECKED,0);
    drawflag=TRUE;
   }
   else{
    SendMessage(check,BM_SETCHECK,BST_UNCHECKED,0);
    drawflag=FALSE;
   }
   InvalidateRect(hWnd,NULL,true);
   break;
  }
  return 0;
 case WM_PAINT:
  hdc=BeginPaint(hWnd,&ps);
  if(drawflag){
   Ellipse(hdc,300,200,600,300);
  }
  else{
   Rectangle(hdc,300,200,600,300);
  }
  EndPaint(hWnd,&ps);
  return 0;
 case WM_DESTROY:
  if(SendMessage(check1,BM_GETCHECK,0,0)){
   MessageBox(hWnd,TEXT("체크박스에 체크가 되어있어요"),TEXT("체크"),MB_OK);
  }
  PostQuitMessage(0);
  return 0;
 }
 
 return (DefWindowProc(hWnd,iMessage,wParam,lParam));