---
title: "CMSEncoderUpdateContent(_:_:_:)"
framework: security
role: symbol
role_heading: Function
path: "security/cmsencoderupdatecontent(_:_:_:)"
---

# CMSEncoderUpdateContent(_:_:_:)

Feeds content bytes into the encoder.

## Declaration

```swift
func CMSEncoderUpdateContent(_ cmsEncoder: CMSEncoder, _ content: UnsafeRawPointer, _ contentLen: Int) -> OSStatus
```

## Parameters

- `cmsEncoder`: The CMSEncoder reference returned by the CMSEncoderCreate function.
- `content`: The content that you want to add to the message. The content must conform to the type set with the doc://com.apple.security/documentation/Security/CMSEncoderSetEncapsulatedContentType function (or type id-data if that function has not been called).
- `contentLen`: The length of the content being added, in bytes.

## Return Value

Return Value A result code. See Security Framework Result Codes.

## Discussion

Discussion You use this function to add the content that is to be signed or encrypted. If the message is only a container for certificates added with the CMSEncoderAddSupportingCerts(_:_:) function and has no other content, do not call this function. This function can be called multiple times. After you are finished adding content, call the CMSEncoderCopyEncodedContent function to complete the message creation process. None of the setter functions (CMSEncoderSetHasDetachedContent(_:_:), CMSEncoderSetEncapsulatedContentType, or CMSEncoderSetCertificateChainMode(_:_:)) can be called after this function has been called.