Objective-C

Save All MIME Attachments to Files

Demonstrates the Chilkat Mime.PartsToFiles method, which recursively traverses the MIME tree and saves each part having a nonempty filename parameter to a directory. The first argument is the destination directory and the second is a StringTable that receives the saved filenames.

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

Background: This extracts every named attachment from a message in one call, walking the whole tree so it finds attachments nested inside multipart containers. It saves only parts that declare a filename — inline body parts without one are skipped — and reports what it wrote via the StringTable, which is handy for logging or follow-up processing. The destination directory must already exist.

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Objective-C

#import <CkoMime.h>
#import <CkoStringTable.h>
#import <NSString.h>

BOOL success = NO;

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

//  Recursively traverse the MIME tree and save each part that has a nonempty "filename" parameter
//  to a directory.  The 1st argument is the destination directory and the 2nd is a StringTable
//  that receives the saved filenames.
CkoStringTable *savedFiles = [[CkoStringTable alloc] init];
success = [mime PartsToFiles: @"qa_output/attachments" st: savedFiles];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

int n = [savedFiles.Count intValue];
NSLog(@"%@%d%@",@"Saved ",n,@" files:");
int i;
for (i = 0; i <= n - 1; i++) {
    NSString *name = [savedFiles StringAt: [NSNumber numberWithInt: i]];
    if (savedFiles.LastMethodSuccess == NO) {
        NSLog(@"%@",savedFiles.LastErrorText);
        return;
    }

    NSLog(@"%@",name);
}