Returns an information structure about a conference.

DWORD cnfGetConferenceInfo ( CNFRESOURCEHD cnfresourcehd,
DWORD confid,
CNF_CONFERENCE_INFO
*confinfo,
unsigned size)

cnfresourcehd Handle returned by cnfOpenResource.

confid Conference identifier returned by cnfCreateConference.

confinfo Pointer to a CNF_CONFERENCE_INFO structure:

typedef struct
{
DWORD   size;                     /* size of the structure       */
DWORD allocated_members;        /* number of members allocated */
                               /* for this conference         */
DWORD joined_members;           /* number of members attending */
                               /* this conference             */
DWORD   flags;                    /* capabilities not used flags */
DWORD capabilities;
DWORD user_value;
} CNF_CONFERENCE_INFO; 

See the Details section for a description of these fields.

size The size of the buffer pointed by confinfo.

• SUCCESS
• CTAERR_BAD_ARGUMENT
  confinfo pointer is NULL.
• CTAERR_BAD_SIZE
  size is smaller than the size of CNF_CONFERENCE_INFO.
• CTAERR_INVALID_HANDLE
  cnfresourcehd is not a valid conferencing resource handle.
• CNFERR_INVALID_IDENTIFIER
  confid is not a valid conference identifier.

This function returns the information structure corresponding to the conference designated by confid. The returned CNF_CONFERENCE_INFO size field contains the actual number of bytes written.

The CNF_CONFERENCE_INFO structure contains the following fields:

Field	Description
size	Number of bytes written to the buffer pointed to by confinfo.
allocated_members	Number of members allocated on the conferencing resource for this conference.
joined_members	Number of members currently joined in this conference.
flags	Capabilities disabled at conference creation time.
capabilities	Capabilities enabled at conference creation time.
user_value	Application prompted value.

For more information, see Section 4.7, Accessing Conference Information and Attributes.

cnfCreateConference, cnfGetConferenceList, cnfGetMemberInfo, cnfGetResourceInfo

extern CNFRESOURCEHD cnfresourcehd;
 
INT32 getNumberOfMember(DWORD confid)
{
   CNF_CONFERENCE_INFO confinfo;
   error = cnfGetConferenceInfo (cnfresourcehd, confid, &confinfo,
                                 sizeof(CNF_CONFERENCE_INFO)); 
   if (error != SUCCESS)
      {
      printf("Error when retrieving conference information :
                %d",error);
      }
   return(confinfo.joined_member);
}