Interacting With the Dialog Box From AutoLISP Code

You now need to program your AutoLISP function to interact with the dialog box. The stubbed-out function, gp:getDialogInput, is where this activity will take place. This function now lives in the gp-io.lsp file, which you earlier extracted from gpmain.lsp.

Developing a dialog box interface can be confusing the first few times you do it. It involves planning ahead and asking yourself such questions as:

• Does the dialog box need to be set up with default values?
• What happens when the user chooses a button or enters a value?
• What happens when the user chooses Cancel?
• If the dialog (.dcl) file is missing, what needs to occur?