(Unicode C++) Add File Attachments to a PDF

See more PDF Signatures Examples

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.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkPdfW.h>
#include <CkJsonObjectW.h>
#include <CkBinDataW.h>

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

    CkPdfW pdf;

    // 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.
    bool success = pdf.LoadFile(L"qa_data/pdf/helloWorld.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        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.
    CkJsonObjectW json;
    json.put_EmitCompact(false);

    int 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.
    json.put_I(i);
    json.UpdateString(L"files[i].description",L"Hello World");
    json.UpdateString(L"files[i].localFilePath",L"qa_data/xml/helloWorld.xml");
    i = i + 1;

    // Specify the 2nd file to be attached.
    json.put_I(i);
    json.UpdateString(L"files[i].description",L"Image of starfish");
    json.UpdateString(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.
    json.UpdateString(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.
    json.put_I(i);
    json.UpdateString(L"files[i].description",L"Hello World from Data");
    json.UpdateString(L"files[i].fileData",L"SGVsbG8gV29ybGQsIEhlbGxvIFdvcmxkLCBIZWxsbyBXb3JsZCwgSGVsbG8gV29ybGQsIEhlbGxvIFdvcmxk");
    json.UpdateString(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.
    json.put_I(i);
    json.UpdateString(L"files[i].description",L"Invoice");
    json.UpdateString(L"files[i].localFilePath",L"qa_data/xml/invoice.xml");
    json.UpdateString(L"files[i].embeddedFilename",L"invoice_1234.xml");
    json.UpdateString(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 = pdf.AddEmbeddedFiles(json,L"qa_output/helloWorld_withAttachments.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    // You can alternatively write the PDF file with attachments to a Chilkat BinData object..
    CkBinDataW bd;
    success = pdf.AddEmbeddedFilesBd(json,bd);
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        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");
    }