HarmonyOS 如何设置页面防止截屏？

"requestPermissions":[ 
{ "name" : "ohos.permission.PRIVACY_WINDOW" } 
]

// windowUtils.ets 
 
import window from '@ohos.window'; 
import common from '@ohos.app.ability.common'; 
 
export class windowUtils { 
  static setWindowPrivacyModeInPage(context: common.UIAbilityContext,isFlag: boolean) { 
    window.getLastWindow(context).then((lastWindow)=>{ 
      lastWindow.setWindowPrivacyMode(isFlag); 
    }) 
  } 
} 
 
//页面 
import common from '@ohos.app.ability.common'; 
import { windowUtils } from '../common/windowUtils'; 
 
 
@Entry 
@Component 
struct Index3 { 
  @State message: string = 'Hello World'; 
 
  onPageShow(): void { 
    windowUtils.setWindowPrivacyModeInPage(getContext(this) as common.UIAbilityContext, true); 
 
  } 
 
  onPageHide() { 
    windowUtils.setWindowPrivacyModeInPage(getContext(this) as common.UIAbilityContext,false); 
  } 
 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}