How to write code to limit the range of digital input in MFC edit box, such as 1- 100, and automatically return to the initial input state when the input exceeds the range.

1. directly define the edit box as an int variable, assuming the name is m _ nedit.

2. add testlistboxdlg:: dodataexchange (CDATA exchange * pdx) function in Void.

DDX_Text(pDX，IDC_EDIT 1，m _ nEdit)； The second parameter is the ID of the edit box.

3. Right-click the edit box and add the EN_CHANGE message response method.

4. Add the following code to this method:

void CTESTLISTBOXDlg::onenchangeedit 1()

{

update data(TRUE)；

if(m _ nEdit & gt； 100)

{

m _ nEdit = 0；

update data(FALSE)；

}