Question

我正在使用Azure移动服务从Android设备上传图片。我已按照the documentation成功上传图片。但我找不到任何下载blob的文档。用于上传blob的代码在这里..

 public void uploadPhoto() {

    if (MainActivity.mClient == null) {
        return;
    }

    final Assignment_Attachment item = new Assignment_Attachment();
    item.setAttachementIdentifier(attachmentUniqueIdentifier);
    item.setFilename(MAP_FILE_NAME_KEY);
    item.setContainerName("schoolonlineblobattachment");

    // Use a unigue GUID to avoid collisions.
    UUID uuid = UUID.randomUUID();
    String uuidInString = uuid.toString();
    item.setResourceName(uuidInString);

    // Send the item to be inserted. When blob properties are set this
    // generates a SAS in the response.
    AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... params) {
            try {
                final Assignment_Attachment entity = addItemInTable(item);
                Log.d("sasquerystring", "sasquerystring" + entity.getSasQueryString());

                // If we have a returned SAS, then upload the blob.
                if (entity.getSasQueryString() != null) {

                    // Get the URI generated that contains the SAS
                    // and extract the storage credentials.
                    StorageCredentials cred = new StorageCredentialsSharedAccessSignature(entity.getSasQueryString());
                    URI imageUri = new URI(entity.getImageUri());

                    // Upload the new image as a BLOB from a stream.
                    CloudBlockBlob blobFromSASCredential = new CloudBlockBlob(imageUri, cred);
                    blobFromSASCredential.uploadFromFile(DATA_FOR_UPLOAD);

                }

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {

                    }
                });
            } catch (final Exception e) {
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);

            //other logic here

        }

    };

    runAsyncTask(task);
}

我可以看到＆＃34; downloadToFile（）＆＃34;方法，但仍在搜索使用SAS事物进行下载过程的方法。有人这样做过吗？任何帮助表示赞赏。

Answer 1

要使用SAS，您需要sharedAccessPolicy：

onRequestPermissionsResult

sharedAccessPolicy .AccessPolicy。权限w'用于上传，而'r'用于下载。

尚未验证，但您可以尝试http://inessential.com/2014/04/22/mobile_services_and_blob_storage。另请参阅https://code.msdn.microsoft.com/windowsapps/Upload-File-to-Windows-c9169190处的代码。

希望它会有所帮助。

从azure移动服务下载blob到android

1 个答案: