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Hello, i get error after upload 4Gb data with .Net 4.5 UploadSessionAppendV2Async()

RomanRGS

Hello, i get error after upload 4Gb data with .Net 4.5 UploadSessionAppendV2Async() in Dropbox.Api.Files.UploadSessionLookupError: incorrect_offset in DropBox.Api.DropBoxRequestHandler.d__d`3.MoveNext(). Example sessionId AAAAAAAAAEDksu9YYAiFbQ Files less than 4Gb uploads whith no problem.

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Accepted answers

Greg-DB

Thanks! It looks like you're using a sample we originally posted on the forum here. Thanks to your post, we found an issue with it that would cause it to fail for very large files, due to the use of smaller int types. We've posted an updated version that uses bigger types here:

https://stackoverflow.com/documentation/dropbox-api/409/uploading-a-file/1358/uploading-a-file-using-the-dropbox-net-library#t=201705231652364198429

The use of longs instead of ints lets it support very large offsets.

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Greg-DB

Can you share the code you're using that reproduces this issue? Thanks in advance!

RomanRGS

This code get error on method UploadSessionAppendV2Async after 4gb upload.

static async Task ChunkUpload(DropboxClient client, String path, FileStream stream, int chunkSize)
{
int numChunks = (int)Math.Ceiling((double)stream.Length / chunkSize);
byte[] buffer = new byte[chunkSize];
string sessionId = "";
for (int idx = 0; idx < numChunks; idx++)
{
int bytesRead = stream.Read(buffer, 0, chunkSize);
using (var memStream = new MemoryStream(buffer, 0, bytesRead))
{
if (idx == 0)
{
var result = await client.Files.UploadSessionStartAsync(false, memStream);
sessionId = result.SessionId;
}
else
{
var cursor = new UploadSessionCursor(sessionId, (ulong)((uint)chunkSize * (uint)idx));
if (idx == numChunks - 1)
{
FileMetadata fileMetadata = await client.Files.UploadSessionFinishAsync(cursor, new CommitInfo(path), memStream);
}
else
{
await client.Files.UploadSessionAppendV2Async(cursor, false, memStream);
}
}
}
}
}

Greg-DB

RomanRGS

works fine, thanks.