Forem: Atir Tahir

eSigning - Barcode signature

Atir Tahir — Thu, 27 May 2021 08:26:45 +0000

In this post, we'll explore an eSigning API that allows to add barcode signature(s) within a document.
Supported Barcode Types

Codabar
Code128
Code39Standard
Interleaved2of5
DutchKIX
DotCode
EAN8

Please have a look at this full list of supported barcode types.
To specify different options for Barcode signature, GroupDocs.Signature API provides BarcodeSignOptions class.
So, basically you have to specify Encode type and text. Please have a look at the following code snippet:

using (Signature signature = new Signature("sample.pdf"))
{
    BarcodeSignOptions options = new BarcodeSignOptions("JohnSmith")
    {
        // setup Barcode encoding type
        EncodeType = BarcodeTypes.Code128,
        // set signature position
        Left = 100,
        Top = 100
    };
    signature.Sign("SampleSigned.pdf", options);
}

This is how output will look like and you can get the encoded information just by scanning the Barcode.

Remove pages from a PDF programmatically

Atir Tahir — Fri, 07 May 2021 10:21:50 +0000

How to remove a single or a list of pages from a PDF?
You can do this using Adobe Acrobat or any such software/tool. But what if the tool is not available? And what if you always get such PDF files in bulk and you have to remove all those unnecessary pages. This is just a one random use-case. There could be many others.
GroupDocs.Merger for .NET provides an ability to remove single page or a collection of specific page numbers from the source document.
Have a look at the following code:

string filePath = @"c:\sample.pdf";
string filePathOut = @"c:\output\result.pdf";

RemoveOptions removeOptions = new RemoveOptions(new int[] { 3, 5 });

using (Merger merger = new Merger(filePath))
{
    merger.RemovePages(removeOptions);
    merger.Save(filePathOut);
}

The above code will remove page 3 and 5 from the source file.
About the API
GroupDocs.Merger is a back-end, UI-agnostic API That could be implemented in any .NET (new or existing) application without any third party tool or software dependency.
All you have to do is to add the DLL reference or install NuGet in the application.

Convert a document to Image - Set horizontal and vertical resolutions

Atir Tahir — Wed, 07 Apr 2021 17:57:46 +0000

You can convert a file (e.g. Word, PDF, HTML) to and image format, such as, Tiff, Tif, Jpg, Jpeg, Png, Gig, Bmp, Ico, Psd, Wmf, Emf, Dcm, Webp, Dng, Svg, Jp2, Odg, J2c, J2k, Jpx, Jpf, Jpm, Eps, Cgm, Cdr, Cmx, Dib, Jpc, Jls, DjVu and set the output/resultant image's vertical and horizontal resolutions as follows:

string outputFileTemplate = Path.Combine("c:\output", "converted-page-{0}.png");
SavePageStream getPageStream = page => new FileStream(string.Format(outputFileTemplate, page), FileMode.Create);
using (Converter converter = new Converter("sample.pdf"))
{
    ImageConvertOptions options = new ImageConvertOptions
    {
        Format = ImageFileType.Png,
        HorizontalResolution = 300,
        VerticalResolution = 100
    };

    converter.Convert(getPageStream, options);
}
Jpeg

There are a lot of other options that API provides such as setting flip mode, grayscale. For more details, have a look at this article.

Add PDF OLE object into a Slide

Atir Tahir — Sun, 28 Mar 2021 18:30:43 +0000

See how to embed a document (e.g. PDF, Word, Spreadsheet) in a Presentation Slide.

string filePath = @"c:\sample.ppt";
string filePathEmbedded = @"c:\embedded.pdf";
string filePathOut = @"c:\output\result.ppt";

int pageNumber = 2;
OlePresentationOptions olePresentationOptions = new OlePresentationOptions(filePathEmbedded, pageNumber);
olePresentationOptions.X = 10;
olePresentationOptions.Y = 10;

using (Merger merger = new Merger(filePath))
{
    merger.ImportDocument(olePresentationOptions);
    merger.Save(filePathOut);
}

All you have to do is to add GroupDocs.Merger for .NET API reference in your (new or existing) .NET project, pass the source PPT/PPTX file and the PDF that you want to embed to the API.

In-depth document comparison

Atir Tahir — Sun, 07 Mar 2021 07:36:10 +0000

Do you want to compare documents with all small details? Have a look at the following .NET code:

Comparer comparer = new .Comparer(sourcePath);
comparer.Add(targetPath);
CompareOptions compareOptions = new CompareOptions();
StyleSettings changedStyleSettings = new StyleSettings();
changedStyleSettings.HighlightColor = Color.Red;
compareOptions.ChangedItemStyle = changedStyleSettings;
comparer.Compare(@"D:\result.docx", compareOptions);

This is not it. This document comparison API provides a lot of comparison options and support for multiple file formats. The changes detection algorithms used by GroupDocs.Comparison allows to detect changes in different document parts and blocks.
From style changes (e.g. italic, bold, highlighted text) to the item insertion or deletion, everything will be compared.
Have a look at the following screenshot:

Swap pages programmatically

Atir Tahir — Sun, 14 Feb 2021 11:02:10 +0000

Let's see how we can exchange position of two pages in a single document:

string filePath = @"c:\sample.pptx";
string filePathOut = @"c:\output\result.pptx";

int pageNumber1 = 3;
int pageNumber2 = 6;
SwapOptions swapOptions = new SwapOptions(pageNumber2, pageNumber1);

using (Merger merger = new Merger(filePath))
{
    merger.SwapPages(swapOptions);
    merger.Save(filePathOut);
}

Above code works with PPTX only? No, this .NET API supports a multitude of file formats including but not limited to:

Word
PDF
Spreadsheet

Perks

GroupDocs.Merger for .NET could be implemented in any new or existing .NET project (MVC/Web Forms/WPF/Desktop) without any third party tool or software dependency.

Rendering a DWG file

Atir Tahir — Mon, 28 Dec 2020 11:17:33 +0000

GroupDocs.Viewer for .NET is a back-end API that allows you to render an AutoCAD file to HTML, Image or PDF file formats.
Let's see how to render a DWG file to HTML in few code lines:

string outputDirectory = "output directory";
string pageFilePathFormat = Path.Combine(outputDirectory, "page_{0}.html");
using (Viewer viewer = new Viewer("sample CAD file"))
{                
    HtmlViewOptions options = 
    HtmlViewOptions.ForEmbeddedResources(pageFilePathFormat);    
    viewer.View(options);
}

Same file could be rendered to PDF as follows:

using (Viewer viewer = new Viewer("sample CAD file"))
{
    PdfViewOptions options = new PdfViewOptions(outputFilePath);
    viewer.View(options);
}

Explore the API documentation to learn more. In case of any issue, post it on free support forum.

How do you split a Word document into separate pages?

Atir Tahir — Mon, 21 Dec 2020 06:56:47 +0000

We could split a Word document to separate pages by specifying start and end page number. Secondly, by specifying exact page numbers.
Let’s see both cases in .NET and Java:

Split the document to several one-page documents (by exact page numbers)
.NET

string filePath = @"c:\sample.docx"; 
string filePathOut = @"c:\output\document_{0}.{1}"; 

SplitOptions splitOptions = new SplitOptions(filePathOut, new int[] { 3, 6, 8 }); 

using (Merger merger = new Merger(filePath)) 
{ 
     merger.Split(splitOptions); 
}

Java

String filePath = "c:\sample.docx"; 
String filePathOut = "c:\output\document_{0}.{1}"; 

PageSplitOptions splitOptions = new PageSplitOptions(filePathOut, new int[] { 3, 6, 8 }); 
Merger merger = new Merger(filePath); 
merger.split(splitOptions);

Have a look at .NET and Java developers guide. In case of any issue, you could post it on free support forum.

Load & view a document from Azure Blob Storage

Atir Tahir — Mon, 07 Dec 2020 08:10:28 +0000

How about loading a document/file from cloud such as Azure and rendering it in browser directly (whiteout any need to download the source file to local storage). However, we'll download and save the file to MemoryStream.
We'll use GroupDocs.Viewer API to render or view the document. This back-end API could be integrated in any .NET application without any third party tool or software dependency.
How document viewer API works:

string blobName = "sample.docx";
using (Viewer viewer = new Viewer(() => DownloadFile(blobName)))
{
    HtmlViewOptions viewOptions = HtmlViewOptions.ForEmbeddedResources();                
    viewer.View(viewOptions);
}

Let's fetch the source file:

public static Stream DownloadFile(string blobName)
{
    CloudBlobContainer container = GetContainer();
    CloudBlob blob = container.GetBlobReference(blobName);
    MemoryStream memoryStream = new MemoryStream();
    blob.DownloadToStream(memoryStream);
    memoryStream.Position = 0;
    return memoryStream;
}

Setting up and returning container:

private static CloudBlobContainer GetContainer()
{
    string accountName = "***";
    string accountKey = "***";
    string endpoint = $"https://{accountName}.blob.core.windows.net/";
    string containerName = "***";
    StorageCredentials storageCredentials = new StorageCredentials(accountName, accountKey);
    CloudStorageAccount cloudStorageAccount = new CloudStorageAccount(
    storageCredentials, new Uri(endpoint), null, null, null);
    CloudBlobClient cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();
    CloudBlobContainer container = cloudBlobClient.GetContainerReference(containerName);
    container.CreateIfNotExists();
    return container;
}

For further details or assistance post here at free support forum.

VSD to PDF

Atir Tahir — Mon, 02 Nov 2020 06:32:24 +0000

Suppose you have a VSD file on server and need to convert it to PDF programmatically. So that other users could download and view it.
Have a look at the following code:

using (Converter converter = new Converter("sample.vsd"))
{
    PdfConvertOptions options = new PdfConvertOptions();
    converter.Convert("converted.pdf", options);
}

All you have to do is to add GroupDocs.Conversion for .NET DLL reference in your project. API takes a VSD file as input and converts it to a PDF. You can post here in case of any issue.

Adding text or image watermark programmatically

Atir Tahir — Sun, 25 Oct 2020 15:45:57 +0000

Have a look at these supported file formats. Yes, you can add watermark (image or text) to all of them programmatically.
Have a look at the following code, it adds a text watermark with a specific font-family and size.

using (Watermarker watermarker = new Watermarker("sample.pdf"))
{
    TextWatermark watermark = new TextWatermark("top secret", new Font("Arial", 36));
    watermark.ForegroundColor = Color.Red;
    watermark.HorizontalAlignment = HorizontalAlignment.Center;
    watermark.VerticalAlignment = VerticalAlignment.Center;
    watermarker.Add(watermark);
    watermarker.Save(Constants.OutDocumentPdf);
}

For further details, please visit this documentation article and in case of any issue, you can post it here.

Document conversion with zoom option

Atir Tahir — Mon, 19 Oct 2020 14:17:44 +0000

When you are converting a document to a Spreadsheet (e.g. PDF to Excel, Word to Excel), you can now set the output document zoom level.

using (Converter converter = new Converter("sample.docx", getLoadOptions))
{
    SpreadsheetConvertOptions options = new SpreadsheetConvertOptions
    {
        PageNumber = 2,
        PagesCount = 1,
        Format = SpreadsheetFileType.Xls,
        Zoom = 150
    };
    converter.Convert("converted.xls", options);
}

Have a look at the source file:

And the following output, image at left hand side is 150% zoomed in and the other one is 60% zoomed in

All you have to do is to add this DLL reference in your project. In case of any issue, post it here.