有时候需要限制编辑框输入的字符，比如只允许输入字母字符，或者只允许输入数字字符，本例子通过派生一个CEdit类处理WM＿CHAR消息，然后从编辑控件中过滤特定的...

有时候需要限制编辑框输入的字符，比如只允许输入字母字符，或者只允许输入数字字符，本例子通过派生一个CEdit类处理WM＿CHAR消息，然后从编辑控件中过滤特定的字符。-sometimes necessary to restrict the importation of the edit box characters, such as only allowing the importation of alphabetical characters, or allow only the importation of digital characters in this case through a derived type CEdit WM_CHAR information processing, and then from the Edit Control filtering specific characters.