Hello, I am having trouble reading a "large" root file I generated with a stand-alone application (reads non-root data, produces a root file that consists of a couple of small histos and a TNtuple) I've used this stand-alone program thousands of times over the past year with no problem. This time, the data is much larger there are approximately 56 million entries in the TNtuple, each with 9 variables. I created the TFile with m_hFile = new TFile(pname,"RECREATE","ap data"); I created the TNtuple with m_Ntuple = new TNtuple("nt","Raw","x:y:tof:z:v:delta:pulse:vap:erate"); The program that generates the ntuple terminates normally.. The output file is 696,229,888 Bytes - smaller than the 1900 MByte limit of a TTree. When I open with root, I get the errors shown below. Any ideas what I need to do to fix or diagnose the problem? Thanks I use root v3.03/9a on win2k. Ed Oltman C:\root>root the current keyboard layout is 437 ******************************************* * * * W E L C O M E to R O O T * * * * Version 3.03/09 29 October 2002 * * * * You are welcome to visit our Web site * * http://root.cern.ch * * * ******************************************* Compiled for win32. CINT/ROOT C/C++ Interpreter version 5.15.61, Oct 6 2002 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] TFile *f = new TFile("ap.root") Error in <TObjArray::At>: index 64 out of bounds (size: 13, this: 0x016aeb90) Warning in <TExMap::Remove>: key 131136 not found at 356 Warning in <TBuffer::CheckObject>: reference to object of unavailable class TObject, pointer will be 0 Error in <TBuffer::CheckByteCount>: object of class TStreamerInfo read too many bytes: 34 instead of 2 Warning in <TBuffer::CheckByteCount>: TStreamerInfo::Streamer() not in sync with data on file, fix S treamer() Warning in <TExMap::Remove>: key 131072 not found at 292 Warning in <TBuffer::CheckObject>: reference to object of unavailable class TObject, pointer will be 0 Error in <TBuffer::CheckByteCount>: object of class TStreamerInfo read too many bytes: 34 instead of 2 Warning in <TBuffer::CheckByteCount>: TStreamerInfo::Streamer() not in sync with data on file, fix S treamer() Error in <TBuffer::CheckByteCount>: object of class TStreamerInfo read too many bytes: 30 instead of 2 Warning in <TBuffer::CheckByteCount>: TStreamerInfo::Streamer() not in sync with data on file, fix S treamer() Warning in <TExMap::Remove>: key 50399232 not found at 141 Warning in <TBuffer::CheckObject>: reference to object of unavailable class TObject, pointer will be 0 Error in <TBuffer::CheckByteCount>: object of class TStreamerInfo read too many bytes: 28 instead of 2 Warning in <TBuffer::CheckByteCount>: TStreamerInfo::Streamer() not in sync with data on file, fix S treamer() ERROR reading TStreamerInfo: fClassVersion=-2147483557 ERROR reading TStreamerInfo: fClassVersion=-2147483557 ERROR reading TStreamerInfo: fClassVersion=385881856 root [1]ERROR reading TStreamerInfo: fClassVersion=385881856 I tried f->Recover() and got the following: root [5] f->Recover() Info in <TFile::Recover>: recovered key TH1C:pHeader at address 192 Info in <TFile::Recover>: recovered key TList:StreamerInfo at address 39341120 Info in <TFile::Recover>: recovered key TNtuple:nt at address 77927255 Info in <TFile::Recover>: recovered key TNtuple:nt at address 116052219 Info in <TFile::Recover>: recovered key TH1F:pHits at address 696225755 Info in <TFile::Recover>: recovered key TH1F:pDoubles at address 696225803 Info in <TFile::Recover>: recovered key TH1F:pFlag at address 696225861 Info in <TFile::Recover>: recovered key TFile:C:\root\ap.root at address 696225909 Info in <TFile::Recover>: recovered key TFile:C:\root\ap.root at address 696226249 (Int_t)9 but was still unable to do anything with the file.. I tried f->Dump(): root [11] f->Dump() ==>Dumping object at:989530, name=ap.root, class=TFile fSumBuffer 0 Sum of buffer sizes of objects written so far fSum2Buffer 0 Sum of squares of buffer sizes of objects written so far fBytesWrite 0 Number of bytes written to this file fBytesRead 6.4407e+007 Number of bytes read from this file fBEGIN 64 First used byte in file fEND 696226329 Last used byte in file fSeekFree 696226249 Location on disk of free segments structure fSeekInfo 39341120 Location on disk of StreamerInfo record fD 7 File descriptor fVersion 30309 File format version fCompress 1 Compression level from 0(not compressed) to 9 (max compres sion) fNbytesFree 76 Number of bytes for free segments structure fNbytesInfo 159 Number of bytes for StreamerInfo record fWritten 0 Number of objects written so far fNProcessIDs 0 Number of TProcessID written to this file fOption ->9895ec File options fOption.*fData READ fUnits 4 Number of bytes for file pointers *fFree ->0 Free segments linked list table *fClassIndex ->169ee68 !Index of TStreamerInfo classes written to this file *fCache ->0 !Page cache used to reduce number of small I/O's *fProcessIDs ->16adb20 !Array of pointers to TProcessIDs fModified 1 true if directory has been modified fWritable 0 true if directory is writable fDatimeC ->989550 Date and time when directory is created fDatimeC.fDatime 20021113/105303 fDatimeM ->989558 Date and time of last modification fDatimeM.fDatime 20021113/111332 fNbytesKeys 340 Number of bytes for the keys fNbytesName 80 Number of bytes in TNamed at creation time fSeekDir 64 Location of directory on file fSeekParent 0 Location of parent directory on file fSeekKeys 696225909 Location of Keys record on file *fFile ->989530 pointer to current file in memory *fMother ->0 pointer to mother of the directory *fList ->167cab8 Pointer to objects list in memory *fKeys ->167cb28 Pointer to keys list in memory fUUID ->989584 Unique identifier fUUID.fUUIDIndex 0 !index in the list of UUIDs in TProcessUUID fUUID.fTimeLow 1607350938 60 bit time, lower 32 bits fUUID.fTimeMid 63272 middle 16 time bits fUUID.fTimeHiAndVersion 4566 high 12 time bits + 4 UUID version bits fUUID.fClockSeqHiAndReserved 171 high 6 clock bits + 2 bits reserved fUUID.fClockSeqLow 70 low 8 clock bits fUUID.fNode[6] 95 6 node id bytes fName ->98953c object identifier fName.*fData ap.root fTitle ->989544 object title fTitle.*fData ap data fUniqueID 0 object unique identifier fBits 50332705 bit field status word
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