HarmonyOS如何代码实现打开相机应用

import common from '@ohos.app.ability.common'; 
import Want from '@ohos.app.ability.Want'; 
function startImageCapture(context: common.UIAbilityContext): void { 
  let want: Want = { 
    action: 'ohos.want.action.imageCapture', 
    parameters: { 
      callBundleName: 'com.example.myapplication', 
      supportMultiMode: false 
    } 
  }; 
  context.startAbilityForResult(want, (err, data) => { 
    if (err.code) { 
      console.error(`Failed to start ability for result. Code is ${err.code}, message is ${err.message}`); 
      return; 
    } 
    console.info(`Succeeded in starting ability for result. Data is ${JSON.stringify(data)}`); 
  }) 
} 
function startVideoCapture(context: common.UIAbilityContext): void { 
  let want: Want = { 
    action: 'ohos.want.action.videoCapture', 
    parameters: { 
      callBundleName: 'com.example.myapplication', 
      supportMultiMode: false 
    } 
  }; 
  context.startAbilityForResult(want, (err, data) => { 
    if (err.code) { 
      console.error(`Failed to start ability for result. Code is ${err.code}, message is ${err.message}`); 
      return; 
    } 
    console.info(`Succeeded in starting ability for result. Data is ${JSON.stringify(data)}`); 
  }) 
} 
@Entry 
@Component 
struct Index { 
  build() { 
    Row() { 
      Column() { 
        Button('Start Camera', { stateEffect: true, type: ButtonType.Capsule }) 
          .width('80%') 
          .height(40) 
          .margin(10) 
          .onClick(() => { 
            const context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext; 
            startImageCapture(context); // 打开相机拍照 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}