Communications/Transactions Guide and Reference
To build an application that provides a graphical front
end to a 3270-based host application, you must add a separate 3270 Screen part
for each of the host screens your user needs to interact with. To
connect to 3270 Screen parts, do the following:
- Use the Key sequence validation string, in the 3270 Screen Settings window
or the keyString attribute, which you can specify in the
part's Settings window, to detect when the host screen it represents has
become active. The 3270 Screen part's public interface provides
features that help you do the following:
- Determine which 3270 Screen part is active (based upon which host screen
is currently displayed)
- Identify the positions and lengths of all input and output fields
- Read from and write to the screen
- Send control keystrokes such as Enter, PF, and PA keys
- Make the appropriate connections to communicate with the 3270 Screen
part.
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