harmony 鸿蒙Previewing

2022-08-09
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Previewing

When to Use

Use the camera module APIs to generate and play video streams.

Available APIs

For details, see the available APIs described in development guidelines on photographing.

Limitations and Constraints

None

How to Develop

Perform step 1 through step 4 described in development guidelines on photographing.

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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