Can't read the data in rootfile under Windows

ROOT
1

Hi all
I was developing a Qt program and it works well under Linux. While I turn into windows, a strange problem appears： both ‘TTreereader method’ and ‘SetBranchAddress method’ don’t work. ‘TTreeReader’ can’t ‘Next()’, its ‘GetCurrentEntry()’ always return -1. ‘SetBranchAddress’ can read some data while they misaligned i.e. some data are missed and some ‘non data’ are read…

ROOT Version: preview Windows Visual Studio 2017
_Platform:windows
_Compiler:MSVC2015 32bit

2

The codes and rootfile is in https://drive.google.com/open?id=17YRnWFNel4Ri4Xz5DHo5BjDbn7m_zLL8

It’s nearly empty qt project with some test code…

3

Hi,

I’ll take a look, but it might well be that you hit a “not working yet” part of ROOT 6 on Windows… As you know, it is still a preview version…

Cheers, Bertrand.

4

FYI, groot manages to correctly read your data file:

$> root-ls -t ./Testrun1.root 
=== [./Testrun1.root] ===
version: 61404
  TTree            RAWData            RAWData (entries=1067)
    EventNumber    "EventNumber/I"    TBranch
    number_of_hits "number_of_hits/I" TBranch
    TDC_channel    "TDC_channel"      TBranchElement
    TDC_TimeStamp  "TDC_TimeStamp"    TBranchElement
    TDC_StyleStamp "TDC_StyleStamp"   TBranchElement

$> root-dump ./Testrun1.root  | head
>>> file[./Testrun1.root]
key[000]: RAWData;1 "RAWData" (TTree)
[000][EventNumber]: 1
[000][number_of_hits]: 16
[000][TDC_channel]: [4 8 29 5 8 30 6 31 7 29 4 30 5 31 6 7]
[000][TDC_TimeStamp]: [701.2 694.5 697.8 699.6 714.8 690.6 693.8 696.8 692.4 719.3 717.5 742.5 716.1 719.1 747.8 728.1]
[000][TDC_StyleStamp]: [1 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0]
[001][EventNumber]: 2
[001][number_of_hits]: 12
[001][TDC_channel]: [4 29 5 30 6 29 7 30 4 5 6 7]

(I tested it on Linux, but groot also works (the same) on Windows.)

5

Hi,

Well, which version are you using exactly? Here is what I got with ROOT v6.14.06:

C:\rootdev\readtest>release\mainwindow_1.exe
Warning in <TClassTable::Add>: class ROOT::Detail::TTypedIter<class TEnumConstant> already in TClassTable
16
12
6
45
46
12
47
15
47
33
*****************
1067
0
1
2
3
4
5
6
7
8
9

C:\rootdev\readtest>

EDIT: Make sure to build with the same configuration (debug/release) than the one used to build ROOT, otherwise it will not work properly. This is most probably the origin of your problem!

Cheers, Bertrand.

6

Hi,

I am using 6.14.06(root_v6.14.06.win32.vc15.exe). You’re exactly right, this problem disappear when the project is built in release mode…

I am a quite newcomer with the ‘release’ and ‘debug’ things, could you explain somehow about this?

Thanks very much!

7

The compiler produces code which is different in debug and release mode (debug contains debug - and possibly more - information), and they are not compatible. This is very specific to Microsoft (I think)…