How to Add Attachments to your PDFs with Foxit PDF SDK (C++)

With Foxit PDF SDK, attachments refer to documents rather than file attachment annotations. This allows whole files to be embedded in a document, much like email attachments. PDF SDK provides application APIs to access functions such as loading attachments, getting attachments, inserting/removing attachments, and accessing properties of attachments.

Example:

How to export the embedded attachment file from a PDF and save it as a single file

#include "include/common/fs_common.h"
#include "include/pdf/fs_pdfdoc.h"
#include "include/pdf/fs_pdfattachments.h"
using namespace foxit;
using namespace common;
using namespace pdf;
using namespace foxit::common;
// Assuming PDFDoc doc has been loaded.
// Get information of attachments.
Attachments attachments(doc);
int count = attachments.GetCount();
for (int i = 0; i < count; i++) {
 WString key = attachments.GetKey(i);
 FileSpec file_spec = attachments.GetEmbeddedFile(key);
 if (!file_spec.IsEmpty()) {
 WString name = file_spec.GetFileName();
 if (file_spec.IsEmbedded()) {
 WString exFilePath = "output_directory";
 file_spec.ExportToFile(exFilePath);
 }
 }
}
...

How to remove all the attachments of a PDF

#include "include/common/fs_common.h"
#include "include/pdf/fs_pdfdoc.h"
#include "include/pdf/fs_pdfattachments.h"
...
using namespace foxit;
using namespace common;
using namespace pdf;
using namespace foxit::common;
// Assuming PDFDoc doc has been loaded.
// Get information of attachments.
Attachments attachments(doc);
int count = attachments.GetCount();
for (int i = 0; i < count; i++) {
 WString key = attachments.GetKey(i);
 attachment.RemoveEmbeddedFile(&key);
}
...