|   | Notice: This page contains information for the legacy Phidget21 Library. Phidget21 is out of support. Bugfixes may be considered on a case by case basis. Phidget21 does not support VINT Phidgets, or new USB Phidgets released after 2020. We maintain a selection of legacy devices for sale that are supported in Phidget21. We recommend that new projects be developed against the Phidget22 Library. 
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Template:ExamplePseudocode
The Hello World example has this general structure so you can follow along. We also have an in-depth general introduction to writing Phidget code (like open, read data, etc), as well as the {{{3}}} for specific syntax:
| // ----- Event and Other Functions ----- Create any Language-Specific Functions (exception handling) Create General Attach, Detach, and Error Handling Functions: 
 
 | {{{1}}} | |
| // ----- Main Code ----- 
 Close Device Delete Device 
 | {{{2}}} | 
 button in the menu bar to go to the Phidget22 version of this page.
 button in the menu bar to go to the Phidget22 version of this page.
