Objective-C

Get a Header Attribute of an Attachment

Demonstrates the Chilkat Email.GetAttachmentAttr method, which returns a header-field attribute value from a header field of the Nth attachment. The first argument is the zero-based attachment index, the second names a header field, and the third names an attribute within it. This example reads the filename attribute of the attachment's Content-Disposition header.

Background: A MIME header can have named parameters after its main value, such as Content-Type: text/plain; charset="utf-8"; name="notes.txt". Here charset and name are attributes. GetAttachmentAttr pulls out one named attribute from a chosen header of a specific attachment, sparing you from parsing the raw header string and dealing with quoting or ordering.

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Objective-C

#import <CkoEmail.h>
#import <NSString.h>

//  Demonstrates the GetAttachmentAttr method, which returns a header-field attribute value
//  from a header field of the Nth attachment.  The first argument is the zero-based attachment
//  index, the second is the header field name, and the third is the attribute name.

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"Attachment header attribute";

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

//  Get the "filename" attribute of the attachment's Content-Disposition header (index 0).
NSString *fname = [email GetAttachmentAttr: [NSNumber numberWithInt: 0] fieldName: @"Content-Disposition" attrName: @"filename"];
NSLog(@"%@%@",@"Attachment filename attribute: ",fname);