The Iquery tool displays the properties of components that publish their state through the Inspect API.
Components in Fuchsia may expose structured information about themselves through the Inspect API for debugging purposes. For example Scenic, the Fuchsia graphics engine, publishes its frame rate through the Inspect API.
A component you write could publish an error rate, an interaction count, or other information that’s useful for component debugging.
The Iquery tool lets you do the following:
Only components that publish information through the Inspect API appear in the Iquery tool’s list of components. For more information on the Inspect API, see Fuchsia component inspection.
After launching Fuchsia DevTools in your required developer environment, complete the following steps:
Each property node displays its value in the **Value** column. Clicking a node in the component’s property tree displays the raw JSON representation of that node in the **Preview** pane on the right. <figure><a href="images/inspect_tab_01.gif"> <img src="images/inspect_tab_01.gif" style="width:800px" alt=""></a> </figure> For nodes with histogram properties, the **Iquery** tab displays a histogram of that data in the **Preview** pane. <figure><a href="images/inspect_tab_02.png"> <img src="images/inspect_tab_02.png" style="width:800px" alt=""></a> </figure>