MAPI defines a set of standard verbs, or actions taken when a user makes a menu selection or clicks a button, that all form viewers should support. Each verb has a constant associated with it for identification, defined in the EXCHFORM.H header file. The following table lists the standard form verbs and their associated constants:
| Verb | Value |
|---|---|
| Open | EXCHIVERB_OPEN |
| Reply | EXCHIVERB_REPLYTOSENDER |
| Reply to All | EXCHIVERB_REPLYTOALL |
| Forward | EXCHIVERB_FORWARD |
| EXCHIVERB_PRINT | |
| Save As | EXCHIVERB_SAVEAS |
| Reply to Folder | EXCHIVERB_REPLYTOFOLDER |
When a user chooses a verb, pass its constant in a call to the form's IMAPIForm::DoVerb method to perform its corresponding action.
In addition to accessing verbs through your form viewer, users can sometimes access verbs directly from the form. For example, some form objects allow the user to invoke the Print verb by right-clicking on the form and choosing Print from a context-sensitive menu.
For compatability with Microsoft Mail 3.x, some reserved verbs are also defined. These verbs have constants that start with EXCHIVERB_RESERVED. These should not be passed to DoVerb, although future versions of MAPI may make use of them.