Set a field value on a form

[Saturn57]

I have a form that I would like to set a field value on based on the input from another field value. I would like to look up a value in a table based on a value already inputted in the form and have that lookup value automatically show in another form field.

 

[victorv]

hi,
are you in dialog box and you are speking of edit control?

Suppose yes; you have a control call it MASTER and another
call it SLAVE.

Define for them CString Member Variable, call them cMaster and cSlave

In the Master you have to check the value: you can do it when you leave it (by tab or mouse) or while the value is changing: in 1st case define in message map, the event
EN_KILLFOCUS, in te 2nd EN_CHANGE. In the routine you define
associated with this event, call the UpdateData( TRUE ):
this will update the variable cMaster.
Always in this routine, do your consideration, build the
cSlave variable and call the UpdateData( FALSE ):
this will update all controls and then also SLAVE.

If you don't wont define Member variables, use system call
SetWindowText and GetWindowText together with GetDlgItem.

ciao
vittorio