public static bool DownloadFile(this BosClient bosClient, BOSDownloadRequest bosDownloadRequest, IProgress <int> onProgressPercentChanged)
{
Debug.Assert(bosDownloadRequest.RequestInfo.DownloadSize > 0);
Debug.Assert(bosDownloadRequest.RequestInfo.DownloadedBytes % bosDownloadRequest.RequestInfo.DownloadSize == 0);
var filePath = bosDownloadRequest.RequestInfo.FilePath;
var getObjectRequest = new GetObjectRequest
{
BucketName = bosDownloadRequest.RequestInfo.Bucket,
Key = bosDownloadRequest.RequestInfo.ObjectKey,
};
var objectMetadata = bosClient.GetObjectMetadata(getObjectRequest);
var fileLength = objectMetadata.ContentLength;
Debug.Assert(bosDownloadRequest.RequestInfo.DownloadedBytes < fileLength);
using (var stream = File.OpenWrite(filePath))
{
if (bosDownloadRequest.RequestInfo.DownloadedBytes == 0)
{
// This doesn't work:
//stream.Seek(fileLength, SeekOrigin.Begin);
stream.SetLength(fileLength);
}
stream.Seek(bosDownloadRequest.RequestInfo.DownloadedBytes, SeekOrigin.Begin);
int parts = (int)(fileLength / bosDownloadRequest.RequestInfo.DownloadSize);
if (fileLength % bosDownloadRequest.RequestInfo.DownloadSize != 0)
{
parts += 1;
}
for (int i = (int)(bosDownloadRequest.RequestInfo.DownloadedBytes / bosDownloadRequest.RequestInfo.DownloadSize);
i < parts;
++i)
{
if (bosDownloadRequest.PauseCancellationToken.IsCancellationRequested)
{
return(false);
}
if (bosDownloadRequest.AbortCancellationToken.IsCancellationRequested)
{
stream.Close();
return(false);
}
var startBytes = bosDownloadRequest.RequestInfo.DownloadSize * i;
var endBytes = startBytes + bosDownloadRequest.RequestInfo.DownloadSize - 1;
if (endBytes > fileLength)
{
endBytes = fileLength;
}
onProgressPercentChanged?.Report((int)(((double)startBytes / fileLength) * 100));
getObjectRequest.SetRange(startBytes, endBytes);
var bosObject = bosClient.GetObject(getObjectRequest);
bosObject.ObjectContent.CopyTo(stream);
bosDownloadRequest.RequestInfo.DownloadedBytes += endBytes + 1 - startBytes;
}
onProgressPercentChanged?.Report(100);
}
return(true);
}
private async void downloadToolStripButton__Click(object sender, EventArgs e)
{
var objectListView = bucketTabControl_.SelectedTab.Controls[0] as BOSObjectListView;
Debug.Assert(objectListView != null);
var objectKey = objectListView.SelectedItems[0].SubItems[0].Text;
string filePath;
using (var saveFileDialog = new SaveFileDialog())
{
var filters = new string[]
{
"All Files (*.*)|*.*",
};
saveFileDialog.FileName = Path.GetFileName(objectKey);
saveFileDialog.Filter = string.Join("|", filters);
saveFileDialog.OverwritePrompt = true;
saveFileDialog.CheckPathExists = true;
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
filePath = saveFileDialog.FileName;
}
else
{
return;
}
}
toolStripProgressBar_.Value = 0;
uploadToolStripButton_.Enabled = false;
downloadToolStripButton_.Enabled = false;
settingsToolStripButton_.Enabled = false;
toolStripProgressBar_.Visible = true;
pauseToolStripButton_.Visible = true;
abortToolStripButton_.Visible = true;
pauseCancellationTokenSource_ = new CancellationTokenSource();
abortCancellationTokenSource_ = new CancellationTokenSource();
BOSDownloadRequestInfo bosDownloadRequestInfo;
var downloadInfoFile = filePath + BOSDownloadRequestInfo.DownloadRequestInfoFileExtension;
var downloadingFilePath = filePath + BOSDownloadRequestInfo.DownloadingFileExtension;
if (File.Exists(downloadInfoFile))
{
bosDownloadRequestInfo = JsonHelper.Load <BOSDownloadRequestInfo>(downloadInfoFile);
}
else
{
bosDownloadRequestInfo = new BOSDownloadRequestInfo
{
FilePath = downloadingFilePath,
Bucket = CurrentBucket_,
ObjectKey = objectKey,
DownloadSize = settings_.DownloadSize > 0 ? settings_.DownloadSize : 1024 * 256,
};
}
var bosDownloadRequest = new BOSDownloadRequest
{
RequestInfo = bosDownloadRequestInfo,
PauseCancellationToken = pauseCancellationTokenSource_.Token,
AbortCancellationToken = abortCancellationTokenSource_.Token,
};
bool ok = false;
try
{
ok = await bosClient_.DownloadFileAsync(bosDownloadRequest,
new ProgressBarReporter(toolStripProgressBar_.ProgressBar, SynchronizationContext.Current));
}
catch (Exception ex)
{
MessageBox.Show(
this,
"Failed to download object:\n" + ex.Message,
"Error:",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
if (ok)
{
if (File.Exists(downloadingFilePath))
{
File.Move(downloadingFilePath, filePath);
}
if (File.Exists(downloadInfoFile))
{
File.Delete(downloadInfoFile);
}
}
else if (pauseCancellationTokenSource_.IsCancellationRequested)
{
JsonHelper.Store(downloadInfoFile, bosDownloadRequestInfo);
}
else if (abortCancellationTokenSource_.IsCancellationRequested)
{
if (File.Exists(downloadingFilePath))
{
File.Delete(downloadingFilePath);
}
}
uploadToolStripButton_.Enabled = true;
downloadToolStripButton_.Enabled = true;
settingsToolStripButton_.Enabled = true;
toolStripProgressBar_.Visible = false;
pauseToolStripButton_.Visible = false;
abortToolStripButton_.Visible = false;
pauseCancellationTokenSource_ = null;
abortCancellationTokenSource_ = null;
}
public static Task <bool> DownloadFileAsync(this BosClient bosClient, BOSDownloadRequest bosDownloadRequest, IProgress <int> onProgressPercentChanged)
{
return(Task.Run(() => bosClient.DownloadFile(bosDownloadRequest, onProgressPercentChanged)));
}