---
title: CGPDFOperatorCallback
framework: coregraphics
role: symbol
role_heading: Type Alias
path: coregraphics/cgpdfoperatorcallback
---

# CGPDFOperatorCallback

Performs custom processing for PDF operators.

## Declaration

```swift
typealias CGPDFOperatorCallback = (CGPDFScannerRef, UnsafeMutableRawPointer?) -> Void
```

## Parameters

- `scanner`: A CGPDFScanner object. Core Graphics passes the scanner to your callback function. The scanner contains the PDF content stream that has the PDF operator that corresponds to this callback.
- `info`: A pointer to data passed to the callback.

## Discussion

Discussion Your callback function takes any action that’s appropriate for your application. For example, if you want to count the number of inline images in a PDF but ignore the image data, you would set a callback for the EI operator. In your callback you would increment a counter for each call.