Attachments

Foxit PDF SDK for iOS provides document-level embedded file support via Core SDK: add, read, extract, and remove attachments.

UI Extensions attachment panel

With the full reader (UI Extensions), attachments are available in the side panel—no extra code required.

Core classes

Class	Description
FSAttachments	Document attachment collection
FSFileSpec	File specification for an embedded file

Example: add, enumerate, and extract attachments

#import <FoxitRDK/FSPDFObjC.h>

FSPDFDoc *doc = [[FSPDFDoc alloc] initWithPath:@"path/to/Sample.pdf"];
[doc load:nil];

// Get attachment collection
FSAttachments *attachments = [[FSAttachments alloc] initWithDoc:doc];

// Add attachment
NSString *filePath = @"path/to/attachment.txt";
FSFileSpec *fileSpec = [[FSFileSpec alloc] initWithPDFDoc:doc];
[fileSpec setFileName:@"attachment.txt"];
[fileSpec embed:filePath];
[attachments addEmbeddedFile:@"attachment.txt" file_spec:fileSpec];

// Enumerate attachments
int count = [attachments getCount];
for (int i = 0; i < count; i++) {
    NSString *key = [attachments getKey:i];
    FSFileSpec *spec = [attachments getEmbeddedFile:key];
    NSString *fileName = [spec getFileName];
    NSLog(@"附件: %@", fileName);

    // Export to disk
    [spec exportToFile:[@"path/to/export/" stringByAppendingString:fileName]];
}

// Remove attachment
[attachments removeEmbeddedFile:@"attachment.txt"];

[doc saveAs:@"path/to/output.pdf" saveFlags:FSPDFDocSaveFlagNormal];

API reference

See the API reference for FSAttachments and FSFileSpec.