---
name: "DMXQueryExtension"
section: "3x"
platform: "linux"
package: "libdmx-dev"
version: "1:1.0.2-2"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/DMXQueryExtension/3x"
---

# DMXQueryExtension(3x)

determine if DMX is available

## NAME

DMXQueryExtension - determine if DMX is available

## SYNOPSIS

**#include \<X11/extensions/dmxext.h\>**

```
Bool DMXQueryExtension(Display *dpy,
                       int *event_basep,
                       int *error_basep);
```

## DESCRIPTION

**DMXQueryExtension()** determines if the DMX protocol extension is available.  It will be available if the server is an [**Xdmx**(1)](/Xdmx/1.md) server.

## RETURN VALUE

If the DMX protocol extension is available, *event\_basep* and *error\_basep* will be set to the event and error bases, respectively, and **True** will be returned.  Otherwise, **False** will be returned.

## SEE ALSO

**DMXQueryVersion**(3X),  **DMX**(3X), [**Xdmx**(1)](/Xdmx/1.md)