鸿蒙next版开发：相机开发-会话管理(ArkTS)

import { camera } from '@kit.CameraKit';
 
// 获取相机设备
let cameraManager: camera.CameraManager = camera.getCameraManager();
let cameraDevices: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
 
// 创建预览输出流
let previewOutput: camera.PreviewOutput = cameraManager.createPreviewOutput(previewProfiles[0], XComponentSurfaceId);

// 创建会话
let photoSession: camera.PhotoSession = cameraManager.createSession(camera.SceneMode.NORMAL_PHOTO) as camera.PhotoSession;
 
// 监听会话错误
photoSession.on('error', (error: camera.BusinessError) => {
  console.error(`Capture session error code: ${error.code}`);
});
 
// 开始配置会话
photoSession.beginConfig();
 
// 向会话中添加相机输入流
photoSession.addInput(cameraInput);
 
// 向会话中添加预览输出流
photoSession.addOutput(previewOutput);
 
// 向会话中添加拍照输出流
photoSession.addOutput(photoOutput);
 
// 提交会话配置
await photoSession.commitConfig();
 
// 启动会话
await photoSession.start();

// 判断设备是否支持闪光灯
let flashStatus: boolean = false;
try {
  flashStatus = photoSession.hasFlash();
} catch (error) {
  let err = error as camera.BusinessError;
  console.error('Failed to hasFlash. errorCode = ' + err.code);
}
 
if (flashStatus) {
  // 判断是否支持自动闪光灯模式
  let flashModeStatus: boolean = false;
  try {
    let status: boolean = photoSession.isFlashModeSupported(camera.FlashMode.FLASH_MODE_AUTO);
    flashModeStatus = status;
  } catch (error) {
    let err = error as camera.BusinessError;
    console.error('Failed to check whether the flash mode is supported. errorCode = ' + err.code);
  }
 
  if (flashModeStatus) {
    // 设置自动闪光灯模式
    try {
      photoSession.setFlashMode(camera.FlashMode.FLASH_MODE_AUTO);
    } catch (error) {
      let err = error as camera.BusinessError;
      console.error('Failed to set the flash mode. errorCode = ' + err.code);
    }
  }
}

photoSession.on('error', (error: camera.BusinessError) => {
  console.error(`Capture session error code: ${error.code}`);
});