Objective-C

Check if a MIME Part is Application Data

Demonstrates the Chilkat Mime.IsApplicationData method, which returns whether the Content-Type begins with application/. 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: The application/ family covers everything that is not plain media or text — PDFs, Office documents, ZIP archives, JSON, and the S/MIME application/pkcs7-* types. This broad check is a quick way to flag "binary document" parts, though you will usually look at the specific subtype to decide how to handle each.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoMime.h>

BOOL success = NO;

//  Demonstrates the Mime.IsApplicationData method, which returns whether the Content-Type begins with application/.  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 IsApplicationData]) {
        NSLog(@"%@%d%@%@%@",@"Part ",i,@" (",part.ContentType,@") is application data.");
    }

}