HarmonyOS 鸿蒙Next调用相机、相册图片，通过rcp上传图片报错

从相册复制文件到沙箱目录，可参考如下代码：

function SavePhotoToFileDir(){
  try {
    let photoSelectOptions = new picker.PhotoSelectOptions();
    photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
    photoSelectOptions.maxSelectNumber = 1;
    let photoPicker = new picker.PhotoViewPicker();
    let uris: Array<string> = [];
    photoPicker.select(photoSelectOptions).then((photoSelectResult: picker.PhotoSelectResult) => {
      uris = photoSelectResult.photoUris;
      let fileArray = uris[0].split("/");
      let fileName = fileArray[fileArray.length - 1];
      let file = fs.openSync(uris[0], fs.OpenMode.READ_ONLY);
      let cacheDir = mContext.filesDir;
      let dstPath = cacheDir + '/' + fileName;
      let file2 = fs.openSync(dstPath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
      fs.copyFileSync(file.fd, file2.fd);
      fs.closeSync(file);
      console.info('PhotoViewPicker.select successfully, photoSelectResult uri: ' + JSON.stringify(photoSelectResult));
    }).catch((err: BusinessError) => {
      console.error('PhotoViewPicker.select failed with err: ' + JSON.stringify(err));
    });
  } catch (error) {
    let err: BusinessError = error as BusinessError;
    console.error('PhotoViewPicker failed with err: ' + JSON.stringify(err));
  }
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

rcp使用post传输携带图片的二进制格式表单数据使用封装可参考如下：

const fileData = 'data/storage/../tmp/img.png' //沙箱路径
const session = rcp.createSession();
session.post(“http://example.com/post”, {
fields: [
{
contentType: ‘image/png’,
contentOrPath: fileData,
}
]
}).then((response) => {
console.info(Response succeed: ${response});
}).catch((err: BusinessError) => {
console.error(err: err code is ${err.code}, err message is ${<span class="hljs-built_in">JSON</span>.stringify(err)});
});
} 

或使用rcp库能力封装uploadFromStream接口能力上传，能力使用可参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/remote-communication-rcp-V5#section566817286112