(Objective-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.

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#import <CkoPdf.h>
#import <CkoJsonObject.h>
#import <CkoBinData.h>

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

CkoPdf *pdf = [[CkoPdf alloc] init];

// 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: @"qa_data/pdf/helloWorld.pdf"];
if (success == NO) {
    NSLog(@"%@",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.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;

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.I = [NSNumber numberWithInt: i];
[json UpdateString: @"files[i].description" value: @"Hello World"];
[json UpdateString: @"files[i].localFilePath" value: @"qa_data/xml/helloWorld.xml"];
i = i + 1;

// Specify the 2nd file to be attached.
json.I = [NSNumber numberWithInt: i];
[json UpdateString: @"files[i].description" value: @"Image of starfish"];
[json UpdateString: @"files[i].localFilePath" value: @"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: @"files[i].subType" value: @"image/jpeg"];
i = i + 1;

// You can alternatively provide the file data from base64 encoded data rather than from a local file.
json.I = [NSNumber numberWithInt: i];
[json UpdateString: @"files[i].description" value: @"Hello World from Data"];
[json UpdateString: @"files[i].fileData" value: @"SGVsbG8gV29ybGQsIEhlbGxvIFdvcmxkLCBIZWxsbyBXb3JsZCwgSGVsbG8gV29ybGQsIEhlbGxvIFdvcmxk"];
[json UpdateString: @"files[i].embeddedFilename" value: @"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.I = [NSNumber numberWithInt: i];
[json UpdateString: @"files[i].description" value: @"Invoice"];
[json UpdateString: @"files[i].localFilePath" value: @"qa_data/xml/invoice.xml"];
[json UpdateString: @"files[i].embeddedFilename" value: @"invoice_1234.xml"];
[json UpdateString: @"files[i].subType" value: @"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 outFilePath: @"qa_output/helloWorld_withAttachments.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

// You can alternatively write the PDF file with attachments to a Chilkat BinData object..
CkoBinData *bd = [[CkoBinData alloc] init];
success = [pdf AddEmbeddedFilesBd: json bd: bd];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

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

NSLog(@"%@",@"Success.");