# OBEXHeadersToBytes(_:) Converts a dictionary of headers to a data pointer, from which you can extract as bytes and pass to the OBEX command/response functions. ``` func OBEXHeadersToBytes(_ dictionaryOfHeaders: CFDictionary!) -> Unmanaged! ``` ## Parameters `dictionaryOfHeaders` dictionary that you have added headers to with the above OBEXAddXXXHeader functions. ## Return Value Mutable data ref containing the bytes of all headers. ## Discussion Returns a CFMutableDataRef containing all the header data found in the dictionary, formatted according to the OBEX/IrMC spec. YOU MUST RELEASE IT when you are finished with it (ie. when the OBEX request is complete). All OBEX-specification defined headers are supported and should be returned to the dictionary. Use the keys defined above to get headers from dictionary. Example usage: ```objc Example usage: CFMutableDictionaryRef dictionary; CFMutableDataRef mGetHeadersDataRef; uint8_t* headerDataPtr; uint32_t headerDataLength; dictionary = CFDictionaryCreateMutable( kCFAllocatorDefault, 0, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks ); // Package up desired headers. OBEXAddTypeHeader( CFSTR( "text/x-vCard" ), dictionary ); mGetHeadersDataRef = OBEXHeadersToBytes( dictionary ); headerDataPtr = CFDataGetBytePtr( mGetHeadersDataRef ); headerDataLength = CFDataGetLength( mGetHeadersDataRef ); // From here I can pass it to any OBEX command, such as OBEXPut... ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)