use the method like in TMapFile::ls().
Btw: the latest dev release has class TMpaRec already available in
the TMapFile.h.
Cheers, Fons.
>
> I am trying to loop over the objects in a TMapfile. (actually i would
> like to collect them in a TList)
> Right now the map file contains three histograms.
> I followed
> Otto Schaile 's proposal and created a TMapRec.h file and tried the
> following code to loop over the objects.
> It looks like the GetLast method doesn't work as you can see from the
> output of the little test program. Also what is the best way to loop
> over the element in a Mapfile?
>
> while (1)
> {
> mr = mr->GetNext();
> name = mr->GetName();
> cout << name << endl;
> if(mr==mlast){
> cout << "out of the loop"<< endl;
> break;
> }
> }
>
>
>
>
>
> cdfsga:/data69/upgrade/wenzel/server > server_ybs_old
> Memory mapped file: hsimple.map
> Title: Demo memory mapped file with histograms
> Option: READ
> Mapped Memory region: 0x43c0000 - 0x43d86a0 (0.10 MB)
> Current breakval: 0x43ce000
> Object Class Size
> histo1 TH1F 1024
> histo2 TH1F 1024
> histo3 TH2F 11328
> hello World
> histo1
> histo1
>
> *** Break *** segmentation violation
> Abort (core dumped)
>
> This is the TMapRec.h file
>
>
>
> //*CMZ : 2.21/05 08/02/99 11.48.30 by Fons Rademakers
> //*CMZ : 2.21/04 29/01/99 12.53.31 by Fons Rademakers
> //*CMZ : 2.00/12 02/10/98 12.45.22 by Fons Rademakers
> //*CMZ : 2.00/10 29/07/98 11.24.27 by Rene Brun
> //*CMZ : 2.00/09 22/06/98 08.29.53 by Rene Brun
> //*CMZ : 2.00/08 04/06/98 11.13.44 by Fons Rademakers
> //*CMZ : 2.00/04 03/04/98 16.50.01 by Rene Brun
> //*CMZ : 1.03/09 16/12/97 16.35.32 by Rene Brun
> //*-- Author : Fons Rademakers 08/07/97
>
> //*KEEP,CopyRight,T=C.
> /*************************************************************************
>
> * Copyright(c) 1995-1998, The ROOT System, All rights reserved.
> *
> * Authors: Rene Brun, Nenad Buncic, Valery Fine, Fons Rademakers.
> *
> *
> *
> * Permission to use, copy, modify and distribute this software and its
> *
> * documentation for non-commercial purposes is hereby granted without
> *
> * fee, provided that the above copyright notice appears in all copies
> *
> * and that both the copyright notice and this permission notice appear
> *
> * in the supporting documentation. The authors make no claims about the
> *
> * suitability of this software for any purpose.
> *
> * It is provided "as is" without express or implied warranty.
> *
> *************************************************************************/
>
> //*KEND.
> #ifdef WIN32
> //*KEEP,OptimizeOff,T=C++.
> #if defined(__hpux) && !defined(__GNUG__)
> #pragma OPTIMIZE OFF
> #endif
>
> #if defined(_AIX) && !defined(__GNUG__)
> #endif
>
> #if defined(__alpha) && !defined(__GNUG__)
> #endif
>
> #if defined(__sun) && !defined(__GNUG__)
> #endif
>
> #if defined(__sgi) && !defined(__GNUG__)
> #endif
>
> #if defined(_linux)
> #endif
>
> #ifdef WIN32
> #pragma optimize("",off)
> #endif
>
> //*KEND.
> #endif
> //////////////////////////////////////////////////////////////////////////
>
> //
> //
> // TMapFile
> //
> //
> //
> // This class implements a shared memory region mapped to a file.
> //
> // Objects can be placed into this shared memory area using the Add()
> //
> // member function. Whenever the mapped object(s) change(s) call
> //
> // Update() to put a fresh copy in the shared memory. This extra
> //
> // step is necessary since it is not possible to share objects with
> //
> // virtual pointers between processes (the vtbl ptr points to the
> //
> // originators unique address space and can not be used by the
> //
> // consumer process(es)). Consumer processes can map the memory region
> //
> // from this file and access the objects stored in it via the Get()
> //
> // method (which returns a copy of the object stored in the shared
> //
> // memory with correct vtbl ptr set). Only objects of classes with a
> //
> // Streamer() member function defined can be shared.
> //
> //
> //
> //////////////////////////////////////////////////////////////////////////
>
>
>
> #ifdef WIN32
> # include <windows.h>
> # include <process.h>
> # ifdef GetObject
> # undef GetObject
> # endif
> # define HAVE_SEMOP
> #else
> # define INVALID_HANDLE_VALUE -1
> #endif
>
> #include <fcntl.h>
> #include <errno.h>
>
> //*KEEP,TMapFile.
> #include "TMapFile.h"
> //*KEEP,TKeyMapFile,T=C++.
> #include "TKeyMapFile.h"
> //*KEEP,TDirectory.
> #include "TDirectory.h"
> //*KEEP,TBrowser.
> #include "TBrowser.h"
> //*KEEP,TString.
> #include "TString.h"
> //*KEEP,TSystem.
> #include "TSystem.h"
> //*KEEP,TClass.
> #include "TClass.h"
> //*KEEP,mmprivate.
> #include "mmprivate.h"
> //*KEND.
>
> #ifdef R__UNIX
> #define HAVE_SEMOP
> #include <sys/types.h>
> #include <sys/ipc.h>
> #include <sys/sem.h>
> #if defined(R__HPUX) || defined (R__ALPHA) || defined (R__SOLARIS) || \
> defined(R__AIX) || defined(R__HIUX) || defined (R__MKLINUX)
> union semun {
> int val; // value for SETVAL
> struct semid_ds *buf; // buffer for IPC_STAT & IPC_SET
> ushort *array; // array for GETALL & SETALL
> };
> #endif
> #ifdef R__LINUX
> # define SEM_A 0200 // alter permission
> # define SEM_R 0400 // read permission
> #endif
> #endif
>
>
> Long_t TMapFile::fgMapAddress = 0;
> void *TMapFile::fgMmallocDesc = 0;
>
> void *gMmallocDesc = 0;
>
>
> class TMapRec {
>
> friend class TMapFile;
>
> private:
> char *fName; // object name
> char *fClassName; // class name
> TObject *fObject; // pointer to original object
> void *fBuffer; // buffer containing object of class
> name
> Int_t fBufSize; // buffer size
> TMapRec *fNext; // next MapRec in list
>
> public:
> TMapRec(const char *name, TObject *obj, Int_t size, void *buf);
> ~TMapRec();
> const char *GetName(Long_t offset = 0) const { return (char
> *)((Long_t) fName + offset); }
> const char *GetClassName(Long_t offset = 0) const { return (char
> *)((Long_t) fClassName + offset); }
> void *GetBuffer(Long_t offset = 0) const { return (void
> *)((Long_t) fBuffer + offset); }
> Int_t GetBufSize() const { return fBufSize; }
> TMapRec *GetNext(Long_t offset = 0) const { return (TMapRec
> *)((Long_t) fNext + offset); }
> };
>
> TMapRec::TMapRec(const char *name, TObject *obj, Int_t size, void *buf)
> {
> fName = StrDup(name);
> fClassName = 0;
> fObject = obj;
> fBuffer = buf;
> fBufSize = size;
> fNext = 0;
> }
>
> TMapRec::~TMapRec()
> {
> delete [] fName;
> delete [] fClassName;
> }
>
>
>
-- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland Phone: +41 22 7679248 E-Mail: Fons.Rademakers@cern.ch Fax: +41 22 7677910 URL: http://root.cern.ch/~rdm/