WSK_PROVIDER_CHARACTERISTICS structure (wsk.h)

The WSK_PROVIDER_CHARACTERISTICS structure specifies the characteristics of the WSK subsystem.

Syntax

typedef struct _WSK_PROVIDER_CHARACTERISTICS {
  USHORT HighestVersion;
  USHORT LowestVersion;
} WSK_PROVIDER_CHARACTERISTICS, *PWSK_PROVIDER_CHARACTERISTICS;

Members

HighestVersion

The highest version of the WSK Network Programming Interface (NPI) that is supported by the WSK subsystem.

LowestVersion

The lowest version of the WSK NPI that is supported by the WSK subsystem.

Remarks

When a WskCaptureProviderNPI call fails with status code STATUS_NOINTERFACE, the WSK application can use a call to WskQueryProviderCharacteristics to query the range of WSK NPI versions supported by the WSK subsystem. WskQueryProviderCharacteristics returns the version information by means of the WSK_PROVIDER_CHARACTERISTICS structure. A WSK application can use this information to determine if the WSK subsystem supports a version of the WSK NPI that is compatible with the application.

The major and minor version numbers that are contained within the HighestVersion and LowestVersion members are encoded by using the MAKE_WSK_VERSION macro:

Version = MAKE_WSK_VERSION(Major,Minor);

The major and minor version numbers can be extracted from the HighestVersion and LowestVersion members by using the WSK_MAJOR_VERSION and WSK_MINOR_VERSION macros:

Major = WSK_MAJOR_VERSION(Version);
Minor = WSK_MINOR_VERSION(Version);

If a WSK application determines that the WSK subsystem supports a version of the WSK NPI that is compatible with the application, the application should call WskRegister and, by means of the Dispatch member of the WSK_CLIENT_NPI structure pointed to by the WskClientNpi parameter, it should specify the exact version of the WSK NPI that it would like to use in the Version member of the WSK_CLIENT_DISPATCH structure. The WSK application should specify the remaining members of the WSK_CLIENT_DISPATCH structure to conform with the version of the WSK NPI that is specified in the Version member of the structure.

For more information about attaching a WSK application to the WSK subsystem, see Registering a Winsock Kernel Application.

Requirements

   
Minimum supported client Available in Windows Vista and later versions of the Windows operating systems.
Header wsk.h (include Wsk.h)

See also

WSK_CLIENT_DISPATCH

WSK_CLIENT_NPI

WskCaptureProviderNPI

WskQueryProviderCharacteristics

WskRegister