Objective-C

Convert a MIME Entity to multipart/mixed

Demonstrates the Chilkat Mime.ConvertToMultipartMixed method, which wraps the current entity in a new outer multipart/mixed, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you turn an existing single-part message into one that can hold attachments — rather than rebuilding it, you wrap it, and its content becomes the first child of a new multipart/mixed. Message-level and custom headers are carried onto the new outer entity so the message identity is preserved. Afterward, AppendPartFromFile adds attachments beside the original body.

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Objective-C

#import <CkoMime.h>

BOOL success = NO;

CkoMime *mime = [[CkoMime alloc] init];
success = [mime LoadMimeFile: @"qa_data/message.eml"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

//  Wrap the current entity in a new outer multipart/mixed entity.  The original entity becomes the
//  first child, which is what you do to add attachments to an existing single-part message.
success = [mime ConvertToMultipartMixed];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

//  Now attachments can be appended alongside the original content.
success = [mime AppendPartFromFile: @"qa_data/report.pdf"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Number of parts: ",[mime.NumParts intValue]);