harmony 鸿蒙Common Event Manager
Common Event Manager
The Common Event Manager enables you to print common event information and publish common events. It provides the common event debugging and testing capabilities, for example, printing all public event subscribers, sent public events, and recipients, and simulating public event release.
Environment Requirements
Before using this tool, you must obtain the hdc tool and run the hdc shell command.
cem Commands
| Command | Description |
|---|---|
| help | Displays the cem help information. |
| publish | Publishes a common event. |
| dump | Dumps information about common events. |
help
# Display the cem help information.
cem help
publish
# Publish a common event.
cem publish [<options>]
Parameters
| Name | Description |
|---|---|
| -e/–event | Name of the common event to publish. This parameter is mandatory. |
| -o/–ordered | Indicates that the common event to publish is ordered. By default, non-ordered events are published. This parameter is optional. |
| -c/–code | Result code of the common event. This parameter is optional. |
| -d/–data | Data carried in the common event. This parameter is optional. |
| -h/–help | Help information. |
Example
# Publish a common event named testevent.
cem publish --event "testevent"
# Publish an ordered common event named testevent. The result code of the event is 100 and the data carried is "this is data".
cem publish -e "testevent" -o -c 100 -d "this is data"
dump
NOTE
The Common Event Manager has two editions: eng and user. The dump command can be used only in the eng edition. If it is used in the user edition, the message error: user version cannot use dump is reported.
# Dumps information about common events.
cem dump [<options>]
Parameters
| Name | Description |
|---|---|
| -a/–all | Information about all common events that have been sent since system startup. |
| -e/–event | Information about a specific event. |
| -h/–help | Help information. |
Example
# Display details of a common event named testevent.
cem dump -e "testevent"
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