Objective-C

Attach a File with an Explicit Content Type

Demonstrates the Chilkat Email.AddFileAttachment2 method, which attaches a file from the filesystem and lets you explicitly specify its content type rather than having Chilkat infer it from the file extension. This example attaches a binary file as application/octet-stream.

Background: Extension-based type detection is convenient but not always right — a file may have an unusual or missing extension, or you may need a very specific MIME type for the recipient to process it correctly. Specifying the content type explicitly removes the guesswork. application/octet-stream is the generic "arbitrary binary data" type, a safe default that tells the client to treat the attachment as an opaque download rather than trying to render it.

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Objective-C

#import <CkoEmail.h>

BOOL success = NO;

//  Demonstrates the AddFileAttachment2 method, which attaches a file and lets you
//  explicitly specify its content type instead of letting Chilkat infer it.

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"Email with a file attachment";
email.Body = @"Please see the attached file.";

//  Attach a file, explicitly specifying the content type.
success = [email AddFileAttachment2: @"qa_data/attachments/data.bin" contentType: @"application/octet-stream"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

NSLog(@"%@%d",@"NumAttachments = ",[email.NumAttachments intValue]);

//  Note: The path "qa_data/attachments/data.bin" is a relative local filesystem path,
//  relative to the current working directory of the running application.