4-Heights® PDF Toolbox SDK - Edit, combine and create PDF in C# .NET Core and Java

The 4-Heights® PDF Toolbox SDK is a fast, high-quality, PDF/A-compliant component to programmatically create PDF documents from scratch, add any content, such as text and images to existing PDFs and assemble (merge and split) PDF documents. Thanks to various interfaces, the SDK can be used with Java, C/C++, .NET Core and .NET languages, such as C# and Visual Basic.

Forms and Annotations

Create, fill and extract forms programmatically. Add, modify and extract annotations.

Edit PDF

Change PDF documents. Add additional information, such as a stamp, image or text or remove text from a PDF.

Create PDF

Create new pages with any content. Make a new PDF or merge them with your existing PDFs.

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Smallpdf is a big hit when it comes to compression

Attaching a large file to an email can prevent it from being sent or received due to technical limitations. In order to solve this problem, the founders of Smallpdf searched for a way to reduce the size of these files.

Save time thanks to cloud-based PDF services

The increase in volume raised the need for more stability and quality - new PDF products were needed with the main requirement to perform the wide number of tasks quickly and at a high quality at the same time.

4-Heights® PDF Toolbox SDK - Product Image

PDF Toolbox - Features

Document assembly

Copy pages from existing PDFs
Copy annotations, form fields, links, logical structure, destinations, outlines, layers
Flatten annotations, form fields, signatures
Optimize resources
Crop and rotate pages
Free composition of content: Overlays, Underlays, Stamps, Transformations
Encryption: User password, Owner password, Permissions
Copy and modify document metadata
Copy and modify page metadata
Add embedded files and associated files
Get and set OpenAction destination

Generation

Document Level
- Create pages
  - Create form fields
  - General text fields and comb text fields
  - Check boxes
  - Radio button groups
  - List boxes
  - Combo boxes
- Create new outline items and insert them at any position in the tree
- Destinations: Named and direct destinations in the same document
Page Content Level
- Create new PDF content from scratch
- Apply content to existing pages
Colors
- Device colors: RGB, CMYK and Grayscale
- ICC color profiles
- Transparency: Alpha and Blend mode
Paths
- Single and Multi-segment lines
- Rectangle, Circle, Bezier curves, Ellipse, Arc, Pie
- Filling, stroking, clipping and combinations thereof
- Line width, cap, join, dash array, dash phase and miter limit
- Inside rule: Nonzero winding rule, Even/odd rule
Text
- Font size, Character spacing, Word spacing
- Horizontal scaling, leading, rise
- Enables simple text layouting
- Standard PDF fonts, installed fonts
- Font metrics: Italic angle, Ascent, Descent, Cap height, Character width
- Unicode characters
- Text stroke: Line width, Line join and Dashes
- Fill and stroke text, invisible text
- Use text as clipping path
Images
- Bi-level: CCITT G3, G3 2D and G4, Flate, LZW, Packbits, uncompressed
- 4 bit and 8 bit grayscale: Flate, LZW, Packbits, JPEG and JPEG-6 (8 bit only), uncompressed
- RGB: Flate, JPEG and JPEG-6, LZW, Packbits, uncompressed
Transformations
- Translation
- Scaling
- Skewing (Horizontal, Vertical)
- Rotation
Annotations
- Web link annotations
- File attachment annotations
- Free text annotation
- Sticky note annotation
- Text stamp annotation
- Custom stamp annotation
- Circle annotation
- Square annotation
- Line annotation
- Polyline annotation
- Polygon annotation
- Free drawing ("ink") annotation

Modification

Page Content
- Selective deletion of content elements (without markup)
- Geometric transformation of content elements (without markup)
Annotations
- Web link annotations’ target URIs
- Markup annotations’ location, creation/modification date, subject, author, content
Form Fields
- Deletion of fields and modification of field values for
  - General text fields and comb text fields
  - Check boxes
  - Radio button groups
  - List boxes
  - Combo boxes

Extraction

Document and Page
- Document information entries: Title, Author, Subject, Keywords, Creator, Producer, Creation date, Modification date
- Document XMP metadata
- Document encryption settings
- Embedded files
- Page bounding boxes: Media box, Crop box, Bleed box, Trim box, Art box
- Page XMP metadata
- Outline item tree: Tree structure, item title, expanded/collapsed
- Destinations: Named and direct destinations in the same document
- Viewer settings
Content
- Page’s and group’s content elements including
  - Bounding box
  - Affine transformation
- As either of the following:
  - Group element
  - Image element
    - Width and height in pixel
    - Bits per component
    - Color space
- Image mask element
  - Width and height in pixel
  - Paint for filling the mask
- Path element
  - Alignment box
  - Fill parameters including paint and fill rule
  - Stroke parameters including line paint and line style
- Shading element
- Text element
  - Text fragments
    - Bounding box
    - Affine transformation
    - Unicode string
    - Fill parameters including paint and fill rule
    - Stroke parameters including line paint and line style
Annotations
- Annotations: location
- Markup annotation: type, location, creation/modification date, subject, author, content
- Custom stamp annotations: appearance
- Link annotations: location, target destination or URI
- Signature fields: name, location, reason, contact info, date, visibility
AcroForm Form Fields
- Form field identifiers, export names and user names, including form field hierarchy
- Form field export and display content of:
  - Push buttons
  - Check boxes
  - Radio button groups
  - General text fields and comb text fields
  - List boxes
  - Combo boxes

Conformance

ISO 32000-1 (PDF 1.7)
ISO 32000-2 (PDF 2.0)
ISO 19005-1 (PDF/A-1)
ISO 19005-2 (PDF/A-2)
ISO 19005-3 (PDF/A-3)

Supported formats

Supported PDF Formats

PDF 1.0 to 1.7
PDF 2.0
PDF/A-1, PDF/A-2, PDF/A-3

Supported image formats

BMP
DIB
JPEG
JPEG2000
JBIG2
PNG
GIF
TIFF

Supported Font Formats

Type1
TrueType
OpenType
OpenType (CFF)

Sample code

MANUALS

.NET Core | Java | C/C++

REFERENCE

Java

Areas of use - edit and composite PDF documents

PDF generation

Programmatic creation of any PDF/A-conform document, whereby its content can stem from any source such as a database or webpage form.

Personalization

PDF documents are used for distributing e-books as well as for creating invoices, contracts and terms and conditions, for instance in insurance application forms. These documents share a common requirement: they need to be supplemented with data specific to the recipient.

Automated reporting

Large quantities of information are stored in databases and DMS systems. PDF Toolbox is designed to receive this information and convert it into distributable standardized PDF documents. It therefore enables the distribution of documents across infrastructures where different technologies and operating systems are in use.

Other areas of use

Mass production of invoices, reports, etc.
PDF creation "on-the-fly" in web server applications
"Save as PDF/A" function in application programs
Import images and text in PDF/A documents

Add stamp to PDF

Add a semi-transparent stamp text onto each page of a PDF document. Optionally specify the color and the opacity of the stamp.

More samples

C# sample:

// Open input document
using (Stream inStream = new FileStream(inPath, FileMode.Open, FileAccess.Read))
using (Document inDoc = Document.Open(inStream, null))

// Create output document
using (Stream outStream = new FileStream(outPath, FileMode.Create, FileAccess.ReadWrite))
using (Document outDoc = Document.Create(outStream, inDoc.Conformance, null))
{
    // Copy document-wide data
    CopyDocumentData(inDoc, outDoc);

    font = Font.CreateFromSystem(outDoc, "Arial", "Italic", true);

    // Get the color space
    ColorSpace colorSpace = ColorSpace.CreateProcessColorSpace(outDoc, ProcessColorSpaceType.Rgb);

    // Choose the RGB color value
    double[] color = { 1.0, 0.0, 0.0 };
    Transparency transparency = new Transparency(alpha);

    // Create paint object with the choosen RGB color
    paint = Paint.Create(outDoc, colorSpace, color, transparency);

    // Define copy options
    PageCopyOptions copyOptions = new PageCopyOptions();

    // Copy all pages from input document
    foreach (Page inPage in inDoc.Pages)
    {
        // Copy page from input to output
        Page outPage = Page.Copy(outDoc, inPage, copyOptions);

        // Add text to page
        AddStamp(outDoc, outPage, stampString);

        // Add page to document
        outDoc.Pages.Add(outPage);
    }
}

private static void CopyDocumentData(Document inDoc, Document outDoc)
{
    // Copy document-wide data

    // Output intent
    if (inDoc.OutputIntent != null)
        outDoc.OutputIntent = IccBasedColorSpace.Copy(outDoc, inDoc.OutputIntent);

    // Metadata
    outDoc.Metadata = Metadata.Copy(outDoc, inDoc.Metadata);

    // Viewer settings
    outDoc.ViewerSettings = ViewerSettings.Copy(outDoc, inDoc.ViewerSettings);

    // Associated files (for PDF/A-3 and PDF 2.0 only)
    FileReferenceList outAssociatedFiles = outDoc.AssociatedFiles;
    foreach (FileReference inFileRef in inDoc.AssociatedFiles)
        outAssociatedFiles.Add(FileReference.Copy(outDoc, inFileRef));

    // Plain embedded files
    FileReferenceList outEmbeddedFiles = outDoc.PlainEmbeddedFiles;
    foreach (FileReference inFileRef in inDoc.PlainEmbeddedFiles)
        outEmbeddedFiles.Add(FileReference.Copy(outDoc, inFileRef));
}

private static void AddStamp(Document outputDoc, Page outPage, string stampString)
{
    // Create content generator and text object
    using ContentGenerator gen = new ContentGenerator(outPage.Content, false);
    Text text = Text.Create(outputDoc);

    // Create text generator
    using (TextGenerator textgenerator = new TextGenerator(text, font, fontSize, null))
    {
        // Calculate point and angle of rotation
        Point rotationCenter = new Point
        {
            X = outPage.Size.Width / 2.0,
            Y = outPage.Size.Height / 2.0
        };
        double rotationAngle = Math.Atan2(outPage.Size.Height,
            outPage.Size.Width) / Math.PI * 180.0;

        // Rotate textinput around the calculated position
        AffineTransform trans = AffineTransform.Identity;
        trans.Rotate(rotationAngle, rotationCenter);
        gen.Transform(trans);

        // Calculate position
        Point position = new Point
        {
            X = (outPage.Size.Width - textgenerator.GetWidth(stampString)) / 2.0,
            Y = (outPage.Size.Height - font.Ascent * fontSize) / 2.0
        };

        // Move to position
        textgenerator.MoveTo(position);

        // Set text paint
        textgenerator.Fill = paint;

        // Add given stamp string
        textgenerator.ShowLine(stampString);
    }
    // Paint the positioned text
    gen.PaintText(text);
}

C# sample:

Java sample:

try (// Open input document
    FileStream inStream = new FileStream(inPath, "r");
    Document inDoc = Document.open(inStream, null);
    FileStream outStream = new FileStream(outPath, "rw")) {
    outStream.setLength(0);
    try (// Create output document
        Document outDoc = Document.create(outStream, inDoc.getConformance(), null)) {
        // Copy document-wide data
        copyDocumentData(inDoc, outDoc);

        // Create embedded font in output document
        font = Font.createFromSystem(outDoc, "Arial", "Italic", true);

        // Get the color space
        ColorSpace colorSpace = ColorSpace.createProcessColorSpace(outDoc, ProcessColorSpaceType.RGB);

        // Choose the RGB color value
        double[] color = { 1.0, 0.0, 0.0 };
        Transparency transparency = new Transparency(alpha);

        // Create paint object
        paint = Paint.create(outDoc, colorSpace, color, transparency);

        // Define page copy options
        PageCopyOptions copyOptions = new PageCopyOptions();

        // Loop throw all pages of input
        for (Page inPage : inDoc.getPages()) {
            // Copy page from input to output
            Page outPage = Page.copy(outDoc, inPage, copyOptions);

            // Add text to page
            addStamp(outDoc, outPage, stampString);

            // Add page to document
            outDoc.getPages().add(outPage);
        }
    }
}

private static void copyDocumentData(Document inDoc, Document outDoc) throws PdfToolboxException, IOException {
    // Copy document-wide data

    // Output intent
    if (inDoc.getOutputIntent() != null)
        outDoc.setOutputIntent(IccBasedColorSpace.copy(outDoc, inDoc.getOutputIntent()));

    // Metadata
    outDoc.setMetadata(Metadata.copy(outDoc, inDoc.getMetadata()));

    // Viewer settings
    outDoc.setViewerSettings(ViewerSettings.copy(outDoc, inDoc.getViewerSettings()));

    // Associated files (for PDF/A-3 and PDF 2.0 only)
    FileReferenceList outAssociatedFiles = outDoc.getAssociatedFiles();
    for (FileReference inFileRef : inDoc.getAssociatedFiles())
        outAssociatedFiles.add(FileReference.copy(outDoc, inFileRef));

    // Plain embedded files
    FileReferenceList outEmbeddedFiles = outDoc.getPlainEmbeddedFiles();
    for (FileReference inFileRef : inDoc.getPlainEmbeddedFiles())
        outEmbeddedFiles.add(FileReference.copy(outDoc, inFileRef));
}

private static void addStamp(Document outputDoc, Page outPage, String stampString)
        throws PdfToolboxException, IOException {
    try (// Create content generator
        ContentGenerator generator = new ContentGenerator(outPage.getContent(), false)) {
        // Create text object
        Text text = Text.create(outputDoc);
        try (// Create text generator
            TextGenerator textgenerator = new TextGenerator(text, font, fontSize, null)) {
            // Calculate point and angle of rotation
            Point rotationCenter = new Point(outPage.getSize().width / 2.0, outPage.getSize().height / 2.0);

            // Calculate rotation angle
            double rotationAngle = Math.atan2(outPage.getSize().height, outPage.getSize().width) / Math.PI * 180.0;

            // Rotate text input around the calculated position
            AffineTransform trans = AffineTransform.getIdentity();
            trans.rotate(rotationAngle, rotationCenter);
            generator.transform(trans);

            // Calculate position
            Point position = new Point((outPage.getSize().width - textgenerator.getWidth(stampString)) / 2.0,
                    (outPage.getSize().height - font.getAscent() * fontSize) / 2.0);

            // Move to position
            textgenerator.moveTo(position);

            // Set text paint
            textgenerator.setFill(paint);

            // Add given stamp string
            textgenerator.showLine(stampString);
        }

        // Paint the positioned text
        generator.paintText(text);
    }
}

Java sample:

C sample:

// Open input document
pInStream = _tfopen(szInPath, _T("rb"));
GOTO_CLEANUP_IF_NULL(pInStream, _T("Failed to open input file \"%s\".\n"), szInPath);
PtxSysCreateFILEStreamDescriptor(&inDescriptor, pInStream, FALSE);
pInDoc = PtxPdf_Document_Open(&inDescriptor, _T(""));
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pInDoc, _T("Input file \"%s\" cannot be opened. %s (ErrorCode: 0x%08x).\n"), szInPath, szErrorBuff, Ptx_GetLastError());

// Create output document
pOutStream = _tfopen(szOutPath, _T("wb+"));
GOTO_CLEANUP_IF_NULL(pOutStream, _T("Failed to open output file %s.\n"), szOutPath);
PtxSysCreateFILEStreamDescriptor(&outDescriptor, pOutStream, 0);
iConformance = PtxPdf_Document_GetConformance(pInDoc);
pOutDoc = PtxPdf_Document_Create(&outDescriptor, &iConformance, NULL);
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pOutDoc, _T("Output file %s cannot be closed. %s (ErrorCode: 0x%08x).\n"), szOutPath, szErrorBuff, Ptx_GetLastError());

// Create embedded font in output document
pFont = PtxPdfContent_Font_CreateFromSystem(pOutDoc, _T("Arial"), _T("Italic"), TRUE);
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pFont, _T("Embedded font cannot be created. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

// Copy document-wide data
GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(copyDocumentData(pInDoc, pOutDoc), _T("Failed to copy document-wide data. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

// Get the color space
TPtxPdfContent_ColorSpace* pColorSpace = PtxPdfContent_ColorSpace_CreateProcessColorSpace(pOutDoc, ePtxPdfContent_ProcessColorSpaceType_Rgb);
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pColorSpace, _T("Failed to get the color space. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

// Chose the RGB color values
double color[] = { 1.0, 0.0, 0.0 };
size_t nColor = sizeof(color) / sizeof(double);
pTransparency = PtxPdfContent_Transparency_New(dAlpha);

// Create paint object
pPaint = PtxPdfContent_Paint_Create(pOutDoc, pColorSpace, color, nColor, pTransparency);
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pPaint, _T("Failed to create a transparent paint. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

// Configure copy options
pCopyOptions = PtxPdf_PageCopyOptions_New();

// Loop through all pages of input
pInPageList = PtxPdf_Document_GetPages(pInDoc);
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pInPageList, _T("Failed to get the pages of the input document. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
pOutPageList = PtxPdf_Document_GetPages(pOutDoc);
GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pOutPageList, _T("Failed to get the pages of the output document. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
for (int i = 0; i < PtxPdf_PageList_GetCount(pInPageList); i++)
{
    // Get a list of pages
    pInPage = PtxPdf_PageList_Get(pInPageList, i);

    // Copy page from input to output
    pOutPage = PtxPdf_Page_Copy(pOutDoc, pInPage, pCopyOptions);
    GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pOutPage, _T("Failed to copy pages from input to output. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Add stamp to page
    if (addStamp(pOutDoc, pOutPage, szStampString, pFont, 50) == 1)
    {
        goto cleanup;
    }

    // Add page to output document
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdf_PageList_Add(pOutPageList, pOutPage), _T("Failed to add page to output document. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    if (pOutPage != NULL)
    {
        Ptx_Release(pOutPage);
        pOutPage = NULL;
    }

    if (pInPage != NULL)
    {
        Ptx_Release(pInPage);
        pInPage = NULL;
    }
}

int copyDocumentData(TPtxPdf_Document * pInDoc, TPtxPdf_Document * pOutDoc)
{
    TPtxPdf_FileReferenceList* pInFileRefList;
    TPtxPdf_FileReferenceList* pOutFileRefList;

    // Output intent
    if (PtxPdf_Document_GetOutputIntent(pInDoc) != NULL)
        if (PtxPdf_Document_SetOutputIntent(pOutDoc, PtxPdfContent_IccBasedColorSpace_Copy(pOutDoc, PtxPdf_Document_GetOutputIntent(pInDoc))) == FALSE)
            return FALSE;

    // Metadata
    if (PtxPdf_Document_SetMetadata(pOutDoc, PtxPdf_Metadata_Copy(pOutDoc, PtxPdf_Document_GetMetadata(pInDoc))) == FALSE)
        return FALSE;

    // Viewer settings
    if (PtxPdf_Document_SetViewerSettings(pOutDoc, PtxPdfNav_ViewerSettings_Copy(pOutDoc, PtxPdf_Document_GetViewerSettings(pInDoc))) == FALSE)
        return FALSE;

    // Associated files (for PDF/A-3 and PDF 2.0 only)
    pInFileRefList = PtxPdf_Document_GetAssociatedFiles(pInDoc);
    pOutFileRefList = PtxPdf_Document_GetAssociatedFiles(pOutDoc);
    if (pInFileRefList == NULL || pOutFileRefList == NULL)
        return FALSE;
    for (int iFileRef = 0; iFileRef < PtxPdf_FileReferenceList_GetCount(pInFileRefList); iFileRef++)
        if (PtxPdf_FileReferenceList_Add(pOutFileRefList, PtxPdf_FileReference_Copy(pOutDoc, PtxPdf_FileReferenceList_Get(pInFileRefList, iFileRef))) == FALSE)
            return FALSE;

    // Plain embedded files
    pInFileRefList = PtxPdf_Document_GetPlainEmbeddedFiles(pInDoc);
    pOutFileRefList = PtxPdf_Document_GetPlainEmbeddedFiles(pOutDoc);
    if (pInFileRefList == NULL || pOutFileRefList == NULL)
        return FALSE;
    for (int iFileRef = 0; iFileRef < PtxPdf_FileReferenceList_GetCount(pInFileRefList); iFileRef++)
        if (PtxPdf_FileReferenceList_Add(pOutFileRefList, PtxPdf_FileReference_Copy(pOutDoc, PtxPdf_FileReferenceList_Get(pInFileRefList, iFileRef))) == FALSE)
            return FALSE;

    return TRUE;
}

int addStamp(TPtxPdf_Document* pOutDoc, TPtxPdf_Page* pOutPage, TCHAR* szStampString, TPtxPdfContent_Font* pFont, double dFontSize)
{
    TPtxPdfContent_ContentGenerator* pGenerator = NULL;
    TPtxPdfContent_Text* pText = NULL;
    TPtxPdfContent_TextGenerator* pTextGenerator = NULL;
    TPtxGeomReal_AffineTransform trans;
    TPtxGeomReal_Point rotationCenter;
    double dTextWidth;
    double dFontAscent;

    TPtxPdfContent_Content* pContent = PtxPdf_Page_GetContent(pOutPage);

    // Create content generator
    pGenerator = PtxPdfContent_ContentGenerator_New(pContent, FALSE);
    GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pGenerator, _T("Failed to create a content generator. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Create text object
    pText = PtxPdfContent_Text_Create(pOutDoc);
    GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pText, _T("Failed to create a text object. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Create a text generator 
    pTextGenerator = PtxPdfContent_TextGenerator_New(pText, pFont, dFontSize, NULL);
    GOTO_CLEANUP_IF_NULL_PRINT_ERROR(pTextGenerator, _T("Failed to create a text generator. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Get output page size
    TPtxGeomReal_Size size;
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdf_Page_GetSize(pOutPage, &size), _T("Failed to read page size. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Calculate point and angle of rotation
    rotationCenter.dX = size.dWidth / 2.0;
    rotationCenter.dY = size.dHeight / 2.0;
    double dRotationAngle = atan2(size.dHeight, size.dWidth) / M_PI * 180.0;

    // Rotate textinput around the calculated position
    PtxGeomReal_AffineTransform_GetIdentity(&trans);
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxGeomReal_AffineTransform_Rotate(&trans, dRotationAngle, &rotationCenter), _T("Failed to rotate textinput around the calculated position. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdfContent_ContentGenerator_Transform(pGenerator, &trans), _T("Failed to modify the current transformation. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Calculate position
    TPtxGeomReal_Point position;
    dTextWidth = PtxPdfContent_TextGenerator_GetWidth(pTextGenerator, szStampString);
    GOTO_CLEANUP_IF_ZERO_PRINT_ERROR(dTextWidth, _T("%s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
    dFontAscent = PtxPdfContent_Font_GetAscent(pFont);
    GOTO_CLEANUP_IF_ZERO_PRINT_ERROR(dFontAscent, _T("%s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
    position.dX = (size.dWidth - dTextWidth) / 2.0;
    position.dY = (size.dHeight - dFontAscent * dFontSize) / 2.0;

    // Move to position
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdfContent_TextGenerator_MoveTo(pTextGenerator, &position), _T("Failed to move to position. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
    // Set text rendering
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdfContent_TextGenerator_SetFill(pTextGenerator, pPaint), _T("Failed to set fill paint. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());
    // Add given stamp string
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdfContent_TextGenerator_ShowLine(pTextGenerator, szStampString), _T("Failed to add stamp. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

    // Close text generator
    if (pTextGenerator != NULL)
    {
        PtxPdfContent_TextGenerator_Close(pTextGenerator);
        pTextGenerator = NULL;
    }

    // Paint the positioned text
    GOTO_CLEANUP_IF_FALSE_PRINT_ERROR(PtxPdfContent_ContentGenerator_PaintText(pGenerator, pText), _T("Failed to paint the positioned text. %s (ErrorCode: 0x%08x).\n"), szErrorBuff, Ptx_GetLastError());

cleanup:
    if (pTextGenerator != NULL)
        PtxPdfContent_TextGenerator_Close(pTextGenerator);
    if (pText != NULL)
        Ptx_Release(pText);
    if (pGenerator != NULL)
        PtxPdfContent_ContentGenerator_Close(pGenerator);
    if (pContent != NULL)
        Ptx_Release(pContent);

    return iReturnValue;
}

C sample:

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