How do I do file cache if I use LoadFromFile in DocumentsService Demo project? - How do I do file cache if I use LoadFromFile in DocumentsService Demo project?

How do I do file cache if I use LoadFromFile in DocumentsService Demo project? Thanks in advance.

Hello Jay,

I'm not quite sure what you are asking, but if you want to load from a file using the cache, simply supply the Cache property to the LoadDocumentOptions object you pass to the LoadFromFile method. Here are the documentation links:
LoadFromFile method
LoadDocumentOptions class
Cache property

Hi Anthony,

How do I get document as blob from the document cache? I want to get document from the cache, convert it to blob and save it to database.

public SaveToCacheResponse SaveToCache(SaveToCacheRequest request)
{

if (request == null)
{
throw new ArgumentNullException("request");
}
if (request.Descriptor == null)
{
throw new ArgumentNullException("Descriptor");
}
var jsonSerialiser = new JavaScriptSerializer();
var userData = jsonSerialiser.Deserialize<dynamic>(request.UserData.ToString());
var serverPath = HttpUtility.UrlDecode(userData["url"]);
//pages,rotateDegrees
var pages = userData["pages"].Split(',');
var rotateDegrees = userData["rotateDegrees"].Split(',');

var cache = ServiceHelper.Cache;

// First try to load it from the cache, if success, update it. Otherwise, assume it is not there and create a new document

using (var document = DocumentFactory.LoadFromCache(cache, request.Descriptor.DocumentId))
{
if (document != null)
{

// Update it
document.UpdateFromDocumentDescriptor(request.Descriptor);
document.AutoDeleteFromCache = false;
document.AutoDisposeDocuments = true;
document.AutoSaveToCache = false;
document.SaveToCache();
return new SaveToCacheResponse { Document = document };
}
}

// Above failed, create a new one.
var createOptions = new CreateDocumentOptions();
createOptions.Descriptor = request.Descriptor;
createOptions.Cache = cache;
createOptions.UseCache = cache != null;
createOptions.CachePolicy = ServiceHelper.CreatePolicy();
using (var document = DocumentFactory.Create(createOptions))
{
if (document == null)
throw new InvalidOperationException("Failed to create document");

CacheController.TrySetCacheUri(document);
document.AutoDeleteFromCache = false;
document.AutoDisposeDocuments = true;
document.AutoSaveToCache = false;
document.SaveToCache();
return new SaveToCacheResponse { Document = document };

}
}

Hello Jay,

We have a guide of how to implement an Azure Redis Cache with Storage Blobs here: https://www.leadtools.com/help/leadtools/v19/dh/to/dox-topics-azurerediscachewithstorageblobsexample.html
In the code on that page is the function GetFromCacheAndBlobStorage which can return the document as a blob, though since it's a private function you will need to access it via the GetCacheItem method.

Thanks for the reply.

I am not using Azure. I am just trying to get file (e.g exmple.tif) out of cache, so I can post it to a web service which will save it to database.

Hello Jay,

We currently don't have a way to store a Document to stream in order to convert to a blob. We have a feature request for this open, but at this time there isn't any way to do this.

Thanks Anthony.

Is there any example for SaveToUri method. How do I set up webclient on server end to accept data from DocumentService SaveToUri
https://www.leadtools.co.../document-savetouri.html

Hello Jay,

After a lot of testing I discussed this issue with a colleague of mine, they said the only way to get the byte data of a document is:

• Save document to temporary file with SaveToFile
  
• Read bytes from file with ReadAllBytes
  
• Delete temporary file
  

You can get a temporary file with the GetTemporaryFileName method