调用CString:: Format，该函数和printf函数具有相同的参数，下例说明了如何使用Format函数：
//Get size of window.
CRect rcWindow
GetWindowRect (rcWindow)
//Format message string.
CString strMessage
strMessage.Format (_T ("Window Size (%d, %d)"),
rcWindow.Width (), rcWindow.Height ())
//Display the message.
MessageBox (strmessage)
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