4-Heights™ PDF Toolbox SDK – Bearbeiten, Zusammenfügen und Erstellen von PDF-Dateien in C# und Java

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);
    }
}

// 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;
}