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/**
@page tut_enumeration_errors Understanding why enumeration failed
Sometimes an application enumerates for a specific node, and gets zero results. Aside for the obvious reason where no module implementing this node type is installed, other reasons may occur - a module might be installed but have no license, or a needed hardware device is currently disconnected.
OpenNI enables the application to get a full list of modules that failed to enumerate, and why each one failed. The list of 'failed' modules is obtained by using the @ref xn::EnumerationErrors object.
For example, the following code tries to create a @ref xn::HandsGenerator node, and if enumeration failed, checks all errors:
@code
xn::EnumerationErrors errors;
xn::HandsGenerator handsGen;
nRetVal = context.CreateAnyProductionTree(XN_NODE_TYPE_HANDS, NULL, handsGen, &errors);
if (nRetVal == XN_STATUS_NO_NODE_PRESENT)
{
// Iterate over enumeration errors, and print each one
for (xn::EnumerationErrors::Iterator it = errors.Begin(); it != errors.End(); ++it)
{
XnChar strDesc[512];
xnProductionNodeDescriptionToString(&it.Description(), strDesc, 512);
printf("%s failed to enumerate: %s\n", xnGetStatusString(it.Error()));
}
return (nRetVal);
}
else if (nRetVal != XN_STATUS_OK)
{
printf("Create failed: %s\n", xnGetStatusString(nRetVal));
return (nRetVal);
}
@endcode
*/
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