PDF header signature not found error? - pdf

Question

I am working on Asp.Net MVC application with Azure. When I upload the PDF document to Azure blob storage it will uploaded perfectly by using below code.
var filename = Document.FileName;
var contenttype = Document.ContentType;
int pdfocument = Request.ContentLength;
//uploading document in to azure blob
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
var storageAccount = CloudStorageAccount.DevelopmentStorageAccount(FromConfigurationSetting("Connection"));
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference("containername");
container.CreateIfNotExists();
var permissions = container.GetPermissions();
permissions.PublicAccess = BlobContainerPublicAccessType.Blob;
container.SetPermissions(permissions);
string uniqueBlobName = string.Format(filename );
CloudBlockBlob blob = container.GetBlockBlobReference(uniqueBlobName);
blob.Properties.ContentType = ;
blob.UploadFromStream(Request.InputStream);
after uploading the document to blob trying to to read the pdf document getting an error "PDF header signature not found." that erorr code is
byte[] pdf = new byte[pdfocument];
HttpContext.Request.InputStream.Read(pdf, 0, pdfocument);
PdfReader pdfReader = new PdfReader(pdf); //error getting here
and one more thing I forgot i.e if we comment the above code(uploading document in to Azure blob) then am not getting that error.

Answer 1

In your combined use case you try to read Request.InputStream twice, once during upload and once later when trying to read it into your byte[] pdf --- when you read it first, you read it until its end, so the second read most likely did not get any data at all.
As you anyways intend to read the PDF into memory (the afore mentioned byte[] pdf), you could in your combined use case
first read the data into that array
int pdfocument = Request.ContentLength;
byte[] pdf = new byte[pdfocument];
HttpContext.Request.InputStream.Read(pdf, 0, pdfocument);
then upload that array using CloudBlob.UploadByteArray
var storageAccount = CloudStorageAccount.DevelopmentStorageAccount(FromConfigurationSetting("Connection"));
[...]
CloudBlockBlob blob = container.GetBlockBlobReference(uniqueBlobName);
blob.Properties.ContentType = ; // <--- something missing in your code...
blob.UploadByteArray(pdf); // <--- upload byte[] instead of stream
and then feed your PDF reader
PdfReader pdfReader = new PdfReader(pdf);
This way you read the stream only once, and a byte[] should be re-usable...