Objective-C

Set the Charset of an Attachment

Demonstrates the Chilkat Email.SetAttachmentCharset method, which sets the charset parameter of the Content-Type header field for the attachment at a given zero-based index. This example adds a text attachment and sets its charset to utf-8.

Background: For a text attachment, the charset parameter tells the receiving client which character encoding the bytes use, so accented or non-Latin text renders correctly. Setting it explicitly (typically utf-8) removes ambiguity when the attachment contains non-ASCII content — without it, a client may guess wrong and display garbled characters.

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Objective-C

#import <CkoEmail.h>

BOOL success = NO;

//  Demonstrates the SetAttachmentCharset method, which sets the charset parameter of the
//  Content-Type header field for the attachment at the given zero-based index.

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"Set attachment charset";

[email AddStringAttachment: @"notes.txt" str: @"Some notes."];

//  Set the charset of the first attachment (index 0) to utf-8.
success = [email SetAttachmentCharset: [NSNumber numberWithInt: 0] charset: @"utf-8"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

//  The attachment's Content-Type now includes charset="utf-8".
NSLog(@"%@",[email GetMime]);