[英]Download blobs from azure mobile service to android
我正在使用Azure移动服务从android设备上传图像。 我已经按照文档成功上传了图像。 但是我找不到任何文档来下载Blob。 我用来上传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“ downloadToFile()”方法,但仍在寻找一种使用SAS东西进行下载过程的方法。 有人这样做吗? 任何帮助表示赞赏。
要使用SAS,您需要一个sharedAccessPolicy:
var sharedAccessPolicy = {
AccessPolicy: {
Permissions: 'w',
Expiry: azure.date.minutesFromNow(5)
}
}
sharedAccessPolicy.AccessPolicy。权限w'用于上传,而'r'用于下载。
尚未验证自己,但您可以尝试http://inessential.com/2014/04/22/mobile_services_and_blob_storage 。 另请参见https://code.msdn.microsoft.com/windowsapps/Upload-File-to-Windows-c9169190上的代码。
希望它会有所帮助。
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