C / C++ / MFC

_AFXWIN_INLINE HGDIOBJ CGdiObject::GetSafeHandle() const<br />
	{ return this == NULL ? NULL : m_hObject; }

// declare and initialize the brushes<br />
CBrush  GroupBrushes[NUM_GROUPS];<br />
CBrush* OldBrush;<br />
<br />
// Create 1 brush for each chemical group using the color settings that the user has chosen<br />
for(int x = 0; x < NUM_GROUPS; x++)<br />
   GroupBrushes[x].CreateSolidBrush(GetGroupBGColor(x)); <br />
<br />
// draw the element cells with the proper color for their chemical group<br />
for(x = 0; x < NUM_ELEMENTS; x++)<br />
{<br />
   // look up the chemical group that the current(x) element belongs to and use that <br />
   // as the index into the array of CBrush objects<br />
   OldBrush = (CBrush*)dc->SelectObject(GroupBrushes[Elements[x].GetGroupNumber()]);<br />
<br />
   dc->Rectangle(<br />
      ((Elements[x].GetColumn() - 1) * CellWidth) + TableBorderWidth, <br />
      ((Elements[x].GetRow() - 1) * CellWidth) + TableBorderWidth, <br />
      ((Elements[x].GetColumn() - 1) * CellWidth) + CellWidth + TableBorderWidth, <br />
      ((Elements[x].GetRow() - 1) * CellWidth) + CellWidth + TableBorderWidth);<br />
<br />
   // restore the old brush - CRASH<br />
   dc->SelectObject(OldBrush);<br />
}