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C/C++ API Documentation | 2026.1

# ClientUser::OutputBinary( const char *, int )

Output binary data.

Virtual? | Yes |
Class | `ClientUser` |
Arguments | `const char *data` | a pointer to the first byte of data to output
| `int length` | the number of bytes to output
Returns | `void` |

## Notes

The default implementation of `OutputBinary()` writes the contents of a binary file to `stdout`. A call to `OutputBinary()` is typically the result of running `p4 print` on a binary file:

`p4 print //depot/file.jpg > newfile.jpg`

## Example

To modify the way in which binary files are output with `p4 print`, create a subclass of `ClientUser` with an alternate implementation of `OutputBinary()`.

For example, suppose that you want PDF files to be printed to `stdout` as plain text. Add the following code (that checks to see if the file is PDF and, if so, calls a hypothetical `OutputPDF()` function to output PDFs to `stdout`) to the beginning of your implementation of `OutputBinary()`.

    void MyClientUser::OutputBinary( const char *data, int length )
    {
        static unsigned char pdfFlag[] = { '%', 'P', 'D', 'F', '-' };
        if ( length >= 5 && memcmp( data, pdfFlag, sizeof( pdfFlag ) ) )
             OutputPDF( data, length );
        else
            ClientUser::OutputBinary( data, length );
    }

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