PageBlob WritePages gives "The page range specified is invalid." exception on last chunk

Question

I can call CloudBlob.UploadFile fine. Now I need to deal with larger files so am experimenting with PageBlob. I've called Create and made my file size a multiple of 512. I'm uploading chunks that are multiples of 512. All seems OK until the final chunk when I get the above exception. There are people out there uploading whole VHDs and I can't upload a crummy little jpg. AAGH.

Other posts: http://social.msdn.microsoft.com/Forums/en-US/windowsazure/thread/814cdaf6-e168-401d-942c-053d7b3666a6/

Development Storage version 1.0.0.0, Azure SDK V 1.0

 

 

private void Button_Click_5(object sender, RoutedEventArgs e)

{

 

var client = new Microsoft.WindowsAzure.StorageClient.CloudBlobClient(

Microsoft.WindowsAzure.

CloudStorageAccount.DevelopmentStorageAccount.BlobEndpoint,

Microsoft.WindowsAzure.

CloudStorageAccount.DevelopmentStorageAccount.Credentials

);

 

var dlg = new System.Windows.Forms.OpenFileDialog() { Filter = "Images|*.jpg|All files|*.*", Title = "Select file to upload" };

dlg.ShowDialog();

 

var fn = dlg.FileName;

 

if(fn != null && System.IO.File.Exists(fn))

{

 

try

{

 

int blockSize = 512 * 8;

 

long offset = 0;

 

var container = client.GetContainerReference("sandpit");

container.CreateIfNotExist();

 

var pb = container.GetPageBlobReference(System.IO.Path.GetFileName(fn));

 

var fileSize = new System.IO.FileInfo(fn).Length;

fileSize += (512 - (fileSize % 512));

pb.Create(fileSize);

 

using (var st = System.IO.File.OpenRead(fn))

{

 

while (offset < fileSize - 1)

{

 

var buffer = new byte[blockSize];

 

var bytesRead = st.Read(buffer, 0, blockSize);

 

using (var ms = new System.IO.MemoryStream(buffer))

{

pb.WritePages(ms, offset);

}

offset += blockSize;

}

}

}

 

catch (Microsoft.WindowsAzure.StorageClient.StorageClientException ____)

{

}

 

catch (Exception ex)

{

}

}

 

Answer 1

Try printing out the file size and the offset you're writing to at each iteration... presumably it's some little off-by-one error.

Answer 2

Thank you! my last page was too big, I was concentrating too hard on the 512 bit.

FileSize += (BlockSize-(FileSize % BlockSize));