Objective-C

Check if a MIME Part is XML

Demonstrates the Chilkat Mime.IsXml method, which returns true only for text/xml or application/xml. It takes no arguments and applies to the current part.

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

Background: Identifying an XML part matters in machine-to-machine messaging — SOAP, EDI, structured data payloads — where you want to hand the body to an XML parser. Note it matches only the two canonical XML media types and not structured-suffix types like application/xhtml+xml, so check the exact type when those are relevant.

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Objective-C

#import <CkoMime.h>

BOOL success = NO;

//  Demonstrates the Mime.IsXml method, which returns whether the Content-Type is text/xml or application/xml.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

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

int n = [mime.NumParts intValue];
CkoMime *part = [[CkoMime alloc] init];
int i;
for (i = 0; i <= n - 1; i++) {
    success = [mime PartAt: [NSNumber numberWithInt: i] subPart: part];
    if (success == NO) {
        NSLog(@"%@",mime.LastErrorText);
        return;
    }

    if ([part IsXml]) {
        NSLog(@"%@%d%@%@%@",@"Part ",i,@" (",part.ContentType,@") is XML.");
    }

}