Getting document text in network

To obtain the extracted text of indexed documents in the search network, the GetDocumentText method of the Searcher class is used.

The first parameter of the GetDocumentText method is a document represented by the NetworkDocumentInfo class. A list of all indexed documents in the search network can be obtained using the GetIndexedDocuments method of the Searcher class.

The second parameter of the GetDocumentText method is the result output adapter. In this operation, the same output adapter classes are used as those used in similar operations of a single index. For information about output adapters, see the Output adapters page.

The examples on this page use the master node of a running search network. The following code creates and starts the master node as described on the Search network deployment page; the slave nodes must be started beforehand.

C#

string basePath = @"c:\SearchNetwork\";
int basePort = 49100;

// Loading the search network configuration from a file
Configuration configuration = Configuration.Load(basePath + "Configuration.xml");

// Creating, configuring and starting the master node; the timeouts are specified in milliseconds
SearchNetworkNode node = SearchNetworkNode.CreateMasterNode(
    0,
    basePath + "Node0",
    new TcpSettings(basePort, 3000, 3000, 3000, 1000),
    new FileLogger(basePath + "Log.txt", 4.0),
    configuration);
node.ConfigureAllNodes();
node.Start();

The following code example, which continues the previous one, demonstrates retrieving the text of a document indexed in the search network, as well as outputting the resulting data to the console.

C#

string fileName = "Lorem ipsum.pdf"; // The name of the document to get the text of

Searcher searcher = node.Searcher;

List<NetworkDocumentInfo> documents = new List<NetworkDocumentInfo>();
int[] shardIndices = node.GetShardIndices();
for (int i = 0; i < shardIndices.Length; i++)
{
    int shardIndex = shardIndices[i];
    NetworkDocumentInfo[] infos = searcher.GetIndexedDocuments(shardIndex);
    documents.AddRange(infos);
    for (int j = 0; j < infos.Length; j++)
    {
        NetworkDocumentInfo info = infos[j];
        NetworkDocumentInfo[] items = searcher.GetIndexedDocumentItems(info);
        documents.AddRange(items);
    }
}

for (int i = 0; i < documents.Count; i++)
{
    NetworkDocumentInfo document = documents[i];
    if (document.DocumentInfo.ToString().Contains(fileName))
    {
        Console.WriteLine();
        Console.WriteLine(document.DocumentInfo.ToString());

        StringOutputAdapter outputAdapter = new StringOutputAdapter(OutputFormat.PlainText);
        searcher.GetDocumentText(document, outputAdapter);

        Console.WriteLine(outputAdapter.GetResult());
        break;
    }
}

More resources

GitHub examples

You may easily run the code from documentation articles and see the features in action in our GitHub examples:

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