内存问题，在线等待！

Question

我有一段代码大致如下：
   CClientDC dc(this)
   for(.......)
   {
       CFont font
       font.Create(........)
       dc.SelectObject(&font)
       dc.OutText(......)
       ....
       .....
       font.DeleteObject()
    }
程序运行期间，发现内存一直在增长，请教各位大虾这是为何？

Answer 1

应该:
       CFont font
       font.Create(........)
       CFont* oldFont = dc.SelectObject(&font)  //!!!!!!!!
       dc.OutText(......)
       ....
       .....
       dc.SelectObject(oldFont);  //!!!!!!!!
       font.DeleteObject()否则
font.DeleteObject() 不成功.

Answer 2

CClientDC dc(this)
   for(.......)
   {
       CFont font
       font.Create(........)
       dc.SelectObject(&font)
       dc.OutText(......)
       ....
       .....
       font.DeleteObject()
    }
 DeleteDC(dc);

Answer 3

CClientDC dc(this);
CFont font;
font.CreateFont(12,
0,
0,
0,
FW_NORMAL, 
FALSE,     
FALSE,     
0,  
ANSI_CHARSET,    
OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,
DEFAULT_QUALITY,    
DEFAULT_PITCH | FF_SWISS,
"Arial");               
for (.................)
{
CFont* def_font = dc.SelectObject(&font);
dc.TextOut(5, 5, "Hello", 5);
dc.SelectObject(def_font); }
font.DeleteObject();