ASP.NET PDF Viewer Control
How to open, view a Tiff image file online in web browser using C# ASP.NET

EdgePDF is an ASP.NET PDF viewer and editor web control. However you could also read, view TIFF image file in web browser with EdgePDF using C# ASP.NET

• Open, read a TIFF file from server side document system or database
• EdgePDF will automatically convert loaded TIFF to PDF document in ASP.NET web server
• Use OCR engine to convert TIFF image to editable PDF document if possible
• View, comment, edit TIFF file online in web browser

How to view a TIFF image file programmatically in asp.net using C#

1. Download EdgePDF asp.net PDF viewer web control
2. Install EdgePDF demo project in IIS
3. Follow step by step tutorial

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Preparation

To run the following tutorial successfully, we need the following setup ready.

1. Install EdgePDF demo project in IIS
2. A demo TIFF image file in folder C:\temp\tiff-1.tif

How to read, view TIFF image online in web browser in ASP.NET C#?

The following steps and C# demo source code will show how to read, view TIFF image file online using ASP.NET C# code.

After you have completed the following guide, you can open, view a TIFF file online in web browser through url (a sample url http://localhost:56643/?yourtarget=tiff-1.tif)

• Open file UserCommandProcessHandler.ashx from {EdgePDF demo project}/RasterEdge_Resource_Files/
• Go to method FileProcess()
• Create a new byte[] object with viewed TIFF image file in byte array
• Call method REProcessControl.PageLoadFile() to load, view TIFF file in EdgePDF. The TIFF file (tiff-1.tif) has been converted into PDF file and displayed in EdgePDF online in web browser

    public override PDFWebDocument FileProcess()
    {
        HttpRequest request = this.Context.Request;

        if (!String.IsNullOrEmpty(request.QueryString["yourtarget"]))
        {
            String docid = request.QueryString["yourtarget"];

            byte[] dataBytes = System.IO.File.ReadAllBytes(@"C:\\temp\" + docid);
                
            return REProcessControl.PageLoadFile(request, this.Manager, dataBytes, docid);
        }
        else
        {
            Logger.Log(">>> Unknown load file mode. Load default file defined in Web.config.", LogType.DEBUG);

            // load default file. defined in Web.config
            return REProcessControl.PageLoadFile(request, this.Manager, "", LoadType.Server);
        }
    }

How to view, comment, edit TIFF image file in web browser in ASP.NET C#?

The following steps and C# demo source code will show how to view, edit a TIFF image file content in web browser using ASP.NET C# code.

After you have completed the following guide, you can open, view a TIFF image file online in web browser through url (a sample url http://localhost:56643/?yourtarget=tiff-1.tif)

• Open file UserCommandProcessHandler.ashx from {EdgePDF demo project}/RasterEdge_Resource_Files/
• Go to method FileProcess()
• Create a new TIFFDocument object with tiff image file loaded
• Use OCR to extract text content from TIFF file. Set OCR resource files location.
• For each tiff image page, use method OCRHandler.Import() to convert to a OCRPage object
• Call method PDFDocument.CombineDocument() to combine all OCRPage objects into a PDFDocument object
• Call method REProcessControl.PageLoadFile() to load, view TIFF image in text content in EdgePDF. The TIFF file (tiff-1.tif) has been converted into editable PDF file and displayed in EdgePDF online in web browser

            // load file
            String docid = request.QueryString["yourtarget"];
            if (docid == null) docid = "0";
            String fileName = docid;

            TIFFDocument tiffDoc = new TIFFDocument(@"C:\\temp\" + docid);
            int pageCount = tiffDoc.GetPageCount();

            MemoryStream editableDoc = new MemoryStream();

            // The folder that contains OCR '.traineddata' files.
            OCRHandler.SetTrainResourcePath(@"C:\Sites\EdgePDF.Sample\OCRSource");

            MemoryStream[] streams = new MemoryStream[pageCount];
            for (int i = 0; i < tiffDoc.GetPageCount(); i++)
            {
                streams[i] = new MemoryStream();
                OCRPage page = OCRHandler.Import(tiffDoc.GetPage(i));
                page.Recognize();
                page.SaveTo(MIMEType.PDF, streams[i]);
            }
            PDFDocument.CombineDocument(streams, editableDoc);

            return REProcessControl.PageLoadFile(request, this.Manager, editableDoc, fileName);