Objective-C

Count the Report Parts in a multipart/report Email

Demonstrates the read-only Chilkat Email.NumReports property, which is the number of report parts in a multipart/report email. A part is counted as a report when its Content-Type is message/* (except message/rfc822) or text/rfc822-headers. Use GetReport to retrieve the body of each report part; indexes are zero-based. This example loads a report email and prints each report part.

Background: When a message can't be delivered, the mail system usually sends back a bounce known as a Delivery Status Notification (DSN). DSNs use the multipart/report structure, which bundles several parts: a human-readable explanation, a machine-readable message/delivery-status part describing exactly what happened (recipient, status code, failing server), and often the original message's headers. Reading these report parts lets a program automatically detect and process bounces.

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Objective-C

#import <CkoEmail.h>

BOOL success = NO;

//  Demonstrates the read-only Email.NumReports property, which is the number of report
//  parts in a multipart/report email (for example, a Delivery Status Notification).
//  Use GetReport to retrieve the body of each report part.  Indexes are zero-based.

CkoEmail *email = [[CkoEmail alloc] init];

//  Load a multipart/report email (such as a bounce / DSN message).
success = [email LoadEml: @"qa_data/eml/dsn_bounce.eml"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

int n = [email.NumReports intValue];
NSLog(@"%@%d",@"NumReports = ",n);

int i;
for (i = 0; i <= n - 1; i++) {
    NSLog(@"%@%d%@",@"---- Report ",i,@" ----");
    NSLog(@"%@",[email GetReport: [NSNumber numberWithInt: i]]);
}