Unicode C

Add File Attachments to a PDF

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Demonstrates how to attach files to a PDF. This is also known as embedding a file within a PDF.

Note: This example requires Chilkat v9.5.0.97 or greater.

Unicode C

#include <C_CkPdfW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdfW pdf;
    HCkJsonObjectW json;
    int i;
    HCkBinDataW bd;

    success = FALSE;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    pdf = CkPdfW_Create();

    // We'll be adding attachments to this PDF file..
    // Note: We are loading the PDF file into memory.  The PDF file is not kept open at this point.
    success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/helloWorld.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        return;
    }

    // Note: The ability to attach files to a PDF was added in Chilkat v9.5.0.97

    // Build JSON to provide information about the files to be embedded in the PDF.
    json = CkJsonObjectW_Create();
    CkJsonObjectW_putEmitCompact(json,FALSE);

    i = 0;

    // We can attach multiple files in one operation.

    // Here we specify the local relative file path of the 1st file to be embedded.
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,L"files[i].description",L"Hello World");
    CkJsonObjectW_UpdateString(json,L"files[i].localFilePath",L"qa_data/xml/helloWorld.xml");
    i = i + 1;

    // Specify the 2nd file to be attached.
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,L"files[i].description",L"Image of starfish");
    CkJsonObjectW_UpdateString(json,L"files[i].localFilePath",L"qa_data/jpg/starfish.jpg");
    // You can explicitly specify the subType (i.e. MIME type) of the file.
    // Otherwise Chilkat will use the default MIME type based on the filename extension.
    // If no default MIME type exists, then "application/octet-stream" is used.
    CkJsonObjectW_UpdateString(json,L"files[i].subType",L"image/jpeg");
    i = i + 1;

    // You can alternatively provide the file data from base64 encoded data rather than from a local file.
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,L"files[i].description",L"Hello World from Data");
    CkJsonObjectW_UpdateString(json,L"files[i].fileData",L"SGVsbG8gV29ybGQsIEhlbGxvIFdvcmxkLCBIZWxsbyBXb3JsZCwgSGVsbG8gV29ybGQsIEhlbGxvIFdvcmxk");
    CkJsonObjectW_UpdateString(json,L"files[i].embeddedFilename",L"abc.txt");
    i = i + 1;

    // By default, the filename used within the PDF is the filename part of the local file path.
    // You can change it by specifying the embeddedFilename.
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,L"files[i].description",L"Invoice");
    CkJsonObjectW_UpdateString(json,L"files[i].localFilePath",L"qa_data/xml/invoice.xml");
    CkJsonObjectW_UpdateString(json,L"files[i].embeddedFilename",L"invoice_1234.xml");
    CkJsonObjectW_UpdateString(json,L"files[i].subType",L"application/xml");

    // The above JSON provides instructions for attaching 4 files to the PDF.
    // Let's attach the files..
    // It is perfectly acceptable to write over the PDF file that was loaded,
    // but in this example we'll write the PDF with attachments to a new PDF file.
    success = CkPdfW_AddEmbeddedFiles(pdf,json,L"qa_output/helloWorld_withAttachments.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        return;
    }

    // You can alternatively write the PDF file with attachments to a Chilkat BinData object..
    bd = CkBinDataW_Create();
    success = CkPdfW_AddEmbeddedFilesBd(pdf,json,bd);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkBinDataW_Dispose(bd);
        return;
    }

    // Then you can do what you want with the BinData, which contains the binary image of the PDF with attachments.

    wprintf(L"Success.\n");


    CkPdfW_Dispose(pdf);
    CkJsonObjectW_Dispose(json);
    CkBinDataW_Dispose(bd);

    }