Hello,
I am using root 3.03/9a on win2k. I have a stand-alone project that
includes the class CLasHeader shown below. When I build the project, I use
rootcint -f headerdict.cpp -c CLasHeader.h
and I include the resulting headerdict.cpp and headerdict.h in my project
build (VC++6). In the standalong file, I do:
TFile *f = new TFile("stream.root","recreate");
CLasHeader h;
...
h->Write()
Now, in an interactive root session, I do the following:
root [0] TFile *f = new TFile("stream.root")
root [1] .L CLasHeader.cpp++
Info in <TWinNTSystem::ACLiC>: creating shared library
C:\str\CLasHeader_cpp.dll
1678.cxx
1680.cxx
1682.cxx
1684.cxx
svo_.cxx
Creating library CLasHeader_cpp.lib and object CLasHeader_cpp.exp
root [2] CLasHeader *ph = (CLasHeader *)f->Get("CLasHeader")
Error in <TBuffer::CheckByteCount>: object of class CLasHeader read too few
bytes: 192 instead of 196
Warning in <TBuffer::CheckByteCount>: CLasHeader::Streamer() not in sync
with data on file, fix Streamer()
Note: If I remove the Double_t fApertureAtten[8] from the class, the
streamer works fine. It looks like a bug...
Ed Oltman
#ifndef _CLASHEADER_H_
#define _CLASHEADER_H_
#include "TObject.h"
class CLasHeader : public TObject
{
public:
CLasHeader();
~CLasHeader();
void Fill(char *pFromLas);
UInt_t fHeaderSize; //Las header size in bytes
UInt_t fStreamVersion; //Stream version number
UInt_t fAcquisitionVersion; //Acquisition version number
UInt_t fHardwareConfiguration; //Hardware configuration
UInt_t fRunNumber; //Run number
UInt_t fAtomProbeId; //Atom probe ID
UInt_t fDebugFlag; //Debug flag
UInt_t fAcquisitionMode; //Acquisition mode
UInt_t fStartDate; //Start date in form YYYYMMDD e.g. 20021213
UInt_t fStartTime; //Start time in form HHMMSS e.g. 153214
UInt_t fMaxHitsPerPulse; //Maximum number of hits per pulse
Double_t fDeltaTofCorrection; //(TOF_X-TOF_Y)/(-2) in nsec
Double_t fNsPerLsb; //TDC least significant bit in nsec
Double_t fT0Estimate; //Estimate of T0 in nsec
Double_t fXposOffset; //Estimate of detector's x-position in ns
Double_t fYposOffset; //Estimate of detector's y-position in ns
Double_t fUnAttenApVoltage; //Unattenuated aperture voltage
Double_t fApertureAtten[8]; //Array of aperture attenuation values
Double_t fTargetEvapRate; //Initial target evaporation rate in
percent
Double_t fTargetPulseFraction; //Initial target pulse fraction in
percent
Double_t fInitialPulseFreq; //Initial target pulse frequency in Hz
#if !defined(__CINT__) || defined(__MAKECINT__)
ClassDef(CLasHeader,1)
#endif
};
#endif
Here is the rootcint generated streamer:
//__________________________________________________________________________
____
void CLasHeader::Streamer(TBuffer &R__b)
{
// Stream an object of class CLasHeader.
UInt_t R__s, R__c;
if (R__b.IsReading()) {
Version_t R__v = R__b.ReadVersion(&R__s, &R__c); if (R__v) { }
TObject::Streamer(R__b);
R__b >> fHeaderSize;
R__b >> fStreamVersion;
R__b >> fAcquisitionVersion;
R__b >> fHardwareConfiguration;
R__b >> fRunNumber;
R__b >> fAtomProbeId;
R__b >> fDebugFlag;
R__b >> fAcquisitionMode;
R__b >> fStartDate;
R__b >> fStartTime;
R__b >> fMaxHitsPerPulse;
R__b >> fDeltaTofCorrection;
R__b >> fNsPerLsb;
R__b >> fT0Estimate;
R__b >> fXposOffset;
R__b >> fYposOffset;
R__b >> fUnAttenApVoltage;
R__b.ReadStaticArray(fApertureAtten);
R__b >> fTargetEvapRate;
R__b >> fTargetPulseFraction;
R__b >> fInitialPulseFreq;
R__b.CheckByteCount(R__s, R__c, CLasHeader::IsA());
} else {
R__c = R__b.WriteVersion(CLasHeader::IsA(), kTRUE);
TObject::Streamer(R__b);
R__b << fHeaderSize;
R__b << fStreamVersion;
R__b << fAcquisitionVersion;
R__b << fHardwareConfiguration;
R__b << fRunNumber;
R__b << fAtomProbeId;
R__b << fDebugFlag;
R__b << fAcquisitionMode;
R__b << fStartDate;
R__b << fStartTime;
R__b << fMaxHitsPerPulse;
R__b << fDeltaTofCorrection;
R__b << fNsPerLsb;
R__b << fT0Estimate;
R__b << fXposOffset;
R__b << fYposOffset;
R__b << fUnAttenApVoltage;
R__b.WriteArray(fApertureAtten, 8);
R__b << fTargetEvapRate;
R__b << fTargetPulseFraction;
R__b << fInitialPulseFreq;
R__b.SetByteCount(R__c, kTRUE);
}
}
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