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XGetExtensionVersion - query the version of the input
extension. 
- XExtensionVersion *XGetExtensionVersion(Display *display,
char 
- *name);  
- display 
- Specifies the connection to the X server.
- name 
- Specifies the extension to be queried.  The input extension name is
defined in the header file XI.h. 
The XGetExtensionVersion request
queries the version of the input  extension, and returns an XExtensionVersion
structure.  This structure contains a major_version and minor_version number
which can be compared with constants defined in XI.h.  Support for additional
protocol  requests added to the input extension after its initial release
is indicated by a version number corresponding to the added requests.  Each
version contains all the protocol requests contained by previous versions.
You should use XFree to free the XExtensionVersion structure. 
This
request returns an XExtensionVersion structure.  typedef struct {      
  int       present;
         short    major_version;
         short    minor_version;
 } XExtensionVersion;  
none 
Programming With Xlib 
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