HarmonyOS Next 保存图片数据到系统文件

当前鸿蒙开发中如果要保存图片数据到系统相册，需要basic权限，而不是我们正常使用Normal权限，一些应用为了避免申请权限的麻烦，或者根本没有理由申请basic权限，可以将图片数据保存到系统文件中

//图片资源压缩处理

let bitmap: ArrayBuffer;//图片数据

let packer: image.ImagePacker = image.createImagePacker();

let packerData = await packer.packing(bitmap, {

    fornat: 'image/jpeg',

    quality: 90

});

// 获取文件名称

let date = new Date();

let year: string = date.getFullYear().toString();

let mouth: string = this.addSpaceZero(date.getMonth() +1);

let day: string = this.addSpaceZero(date.getDate());

let hours: string = this.addSpaceZero(date.getHours());

let ninutes: string = this.addSpaceZero(date.getMinutes());

let seconds: string = this.addSpaceZero(date.getSeconds());

let inageTitle: string = 'IMG_' + year + mouth + day + '_' + hours + minutes + seconds + '.jpg';

hilog.info(0x0000,`saveQRNew imageTitle: ${imageTitle)`, '%{public}s');

//图片保存时option设置

let photoSaveOptions = new picker.PhoteSeveOptions();

photoSaveOptions.newFileNames =[imageTitle];

let abilityContext = getContext() as common.UIAbilityContext;

let photoPicker = new picker.PhotoVienPicker(abilityContext);

photoPicker.save(photoSaveOptions).then((photoSaveResult: Array<string>) =>{

    hilog.info(0x0000,"photoPicker save success, uri: ${JSON.stringify(photoSaveResult)}', '%{public}s');

    let uri: string = photoSaveResult[0] || '';

    let file = fs.openSync(ur1, fs.OpenMode.WRITE_ONLY | fs.OpenMode.CREATE);

    fs.writesync(file.fd, packerData);

    fs.closeSync(file.fd);

}).catch((err: BusinessError)>{

    hilog.info(0x0000,"photoPicker save fail, err: S(JSON.stringify(err)}', '%{public}s');

});

addSpaceZero(timeNum: number): string {

    return timeNum < 10 ? '0' + timeNum.toString() : timeNum.toString();

}

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后面会继续补充不足之处。