SWGuideMessageLoggerCerr < CMSPublic

CMSPublic Web>SWGuide>SWGuideFrameWork>SWGuideMessageLogger>SWGuideMessageLoggerSetupExamples>SWGuideMessageLoggerCerr (2012-04-27, NitishDhingra)

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CMS MessageLogger Service: Establishing a Destination to the cerr Stream

import FWCore.ParameterSet.Config as cms
process.load("FWCore.MessageLogger.MessageLogger_cfi")
process.MessageLogger = cms.Service("MessageLogger",
   destinations   = cms.untracked.vstring(
                                                'detailedInfo'
                                               ,'critical'
                                               ,'cout'
                                               ,'cerr'
                    ),
       critical       = cms.untracked.PSet(
                        threshold = cms.untracked.string('ERROR') 
        ),
       detailedInfo   = cms.untracked.PSet(
                      threshold  = cms.untracked.string('INFO') 
       ),
       cerr           = cms.untracked.PSet(
                       threshold  = cms.untracked.string('WARNING') 
        )
)

 
# set the number of events
process.maxEvents = cms.untracked.PSet(
    input = cms.untracked.int32(5)
)                                    
 
process.myAnalysisModule = cms.EDAnalyzer('ModuleThatIssuesMessages')
process.p = cms.Path(process.myAnalysisModule)

The { ..., "cerr", ... }

in the list of destinations refers to message information streamed to std::cout rather than to a file named cerr.

It is possible for a message to be sent to cerr even though no such stream is listed in the configuration file, since any message sent before services are configured will go to a cerr destination. However, unless cerr appears in the configuration file as a destination, that destination will be turned off once the service has been configured.

The MessageLogger service provides no way to create a destination writing to an ordinary file named cout or cerr.