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OpenNI 1.5.7
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OpenNI errors mechanism is error codes. Every function that might fail has a return value of type XnStatus. A value of XN_STATUS_OK means the function has succeeded. Any other value means some kind of failure has occurred.
For additional error information, one may use the function xnGetStatusString(), which returns a human readable description of the error, in English.
Some basic error codes can be found in file XnStatusCodes.h.
A normal usage of the error mechanism is checking if an error has occurred, and if so, print a message and close the application: