harmony 鸿蒙Previewing Development
Previewing Development
When to Use
Use the camera module APIs to generate and play video streams.
Available APIs
For details, see Available APIs.
Constraints
None
How to Develop
Perform step 1 through step 4 described in Photographing Development.
Set the preview area.
Surface *surface = Surface::CreateSurface();
/* Set the display area. */
surface->SetUserData("region_position_x", "480"); // X-coordinate of the upper left corner of the rectangle.
surface->SetUserData("region_position_y", "270"); // Y-coordinate of the upper left corner of the rectangle.
surface->SetUserData("region_width", "960"); // Width.
surface->SetUserData("region_height", "540"); // Height.
fc->AddSurface(*surface);
- Start and stop previewing.
stateCallback->camera_->TriggerLoopingCapture(*fc); // Start previewing.
stateCallback->camera_->StopLoopingCapture(); // Stop previewing.
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