Objective-C

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Objective-C

#import <CkoCharset.h>

BOOL success = NO;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoCharset *charset = [[CkoCharset alloc] init];

charset.FromCharset = @"utf-8";
charset.ToCharset = @"bom-utf-8";

success = [charset ConvertFile: @"qa_data/txt/helloWorld.txt" destPath: @"qa_output/helloWorldBom.txt"];
if (success != YES) {
    NSLog(@"%@",charset.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");