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C/C++ API Documentation | 2026.1

# ClientApi::GetProtocol( const char * )

Get protocol information for this connection.

Virtual? | No |
Class | `ClientApi` |
Arguments | `const char *v` | the name of the protocol variable being checked
Returns | `StrPtr *` | a pointer to the variable’s value

## Notes

If the variable is unset, the return value is null. If there is a value, it will be a number in most cases, but in the form of a `StrPtr` rather than an `int`.

Call `GetProtocol()` only after a call to `Run()`, because protocol information is not available until after a call to `Run()`. Calling `GetProtocol()` before `Run()` results in a return value of `null`, which looks misleadingly like an indication that the variable is unset.

`GetProtocol()` reports only on variables set by the server, not variables set by the client with calls to `SetProtocol()`.

## Example

The following example code checks whether the server is case-sensitive.

    ...
    client.Init( &e );
    ...
    client.Run();

    if ( client.Dropped() )
    {
        client.Final( &e );
    }

    if ( client.GetProtocol( "nocase" ) )
        printf( "Server case-insensitive.\n" );
    else
        printf( "Server is case-sensitive.\n" );

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