Apple Network Setup - Manual (Page 46)

C H A P T E R 2
Using Network Setup
46 Working with Sets
Listing 2-14 Finding the active entity of a given class and type
static OSStatus MyFindFirstActiveEntity(CfgDatabaseRef dbRef,
CfgAreaID area,
OSType entityClass,
OSType entityType,
CfgEntityRef *activeEntity)
{
OSStatus err;
CfgEntityRef activeSet;
CfgSetsVector **entitiesInSet;
ItemCount entityIndex;
Boolean found;
CfgEntityInfo thisEntityInfo;
entitiesInSet = (CfgSetsVector **) NewHandle(0);
err = MemError();
if (err == noErr) {
err = MyFindActiveSet(dbRef, area, &activeSet);
}
if (err == noErr) {
err = MyReadVariableSizePref(dbRef, &activeSet, kOTCfgSetsVectorPref, (Handle )
entitiesInSet);
}
if (err == noErr) {
HLock( (Handle) entitiesInSet );
found = false;
for (entityIndex = 0; entityIndex < (**entitiesInSet).fCount; entityIndex++) {
thisEntityInfo = (**entitiesInSet).fElements[entityIndex].fEntityInfo;
found = ( thisEntityInfo.fClass == entityClass && thisEntityInfo.fType ==
entityType );
if (found) {
break;
}
}
if ( ! found ) {
err = kCfgErrEntityNotFound;
}
}
if (err == noErr) {