End Google Ads 201810 - BS.net 01 --> Hi all,

I write a MFC program that will execute a drawing circle in another thread when I click on somewhere in client area and I got it.

My problem is when I click various time (and quickly) it sometime gives me an "Assertion Failed" error.

here is my code:
void CGSimView::OnLButtonDown(UINT nFlags, CPoint point)
{
...
DCPOINT info;
PTPOINT3D currentPoint = pDoc->m_graph.GetNode(point.x,point.y);

if(currentPoint != NULL)
{
this->m_nodeIndex = currentPoint->index;

info.hwnd = this->GetSafeHwnd();
this->GetClientRect(&info.rect);
info.point = currentPoint;

AfxBeginThread(onGetFocus,&info);
}


CView::OnLButtonDown(nFlags, point);
}

UINT onGetFocus(LPVOID param)
{

DCPOINT *info = (DCPOINT*)param;

HDC hdc = GetDC(info->hwnd);

PTPOINT3D p = info->point;
int i, temp;
CRect rect = info->rect;
HPEN hPen, hOldPen;

hPen = CreatePen(PS_SOLID,1,RGB(225,0,0));

hOldPen = (HPEN)SelectObject(hdc, hPen);

for(i=0;ix - temp,p->y - temp,p->x + temp, p->y + temp);
Sleep(10);
}

SelectObject(hdc, hOldPen);
DeleteObject(hPen);

return 0;
}


please help me to solve this.
Thank in advance.