# CMSDecoderGetNumSigners(_:_:) Obtains the number of signers of a message. ``` func CMSDecoderGetNumSigners(_ cmsDecoder: CMSDecoder, _ numSignersOut: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `cmsDecoder` The CMSDecoder reference returned by the `CMSDecoderCreate` function. `numSignersOut` On return, the number of signers of the message. Zero indicates that the message was not signed. ## Return Value A result code. See [Security Framework Result Codes](/documentation/Security/security-framework-result-codes). ## Discussion Call the `CMSDecoderCopySignerStatus` function to determine the status of a signature. You cannot call this function until after you have called the `CMSDecoderFinalizeMessage` function. ## See Also [`CMSDecoderCreate(_:)`](/documentation/Security/CMSDecoderCreate(_:)) Creates a CMSDecoder reference. [`CMSDecoderFinalizeMessage(_:)`](/documentation/Security/CMSDecoderFinalizeMessage(_:)) Indicates that there is no more data to decode. --- 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)