I have often found that user input edit boxes on a dialog require much more than the capabilities provided by the basic CEdit control. A common problem I have encountered is the need for an edit control that restricts the characters that can be enter

建立一个单行可编辑文本框，用户可以在文本框中输入数值改变x的最大范围。-Establish a single-line editable text box, the user can enter a value in the text box to the maximum extent of the change of x.