No Dictionary is available

Newbie
1

Dear Root experts,
I have a code that runs over a root file and after reading data and applying some cuts writes the data to an output root file.
The code compiles successfully with no errors. However, in the runtime, I get the following warnings:
Warning in TClass::Init: no dictionary for class edm::Hash<1> is available
Warning in TClass::Init: no dictionary for class edm::ProcessHistory is available
Warning in TClass::Init: no dictionary for class edm::ProcessConfiguration is available
Warning in TClass::Init: no dictionary for class edm::ParameterSetBlob is available
Warning in TClass::Init: no dictionary for class pair<edm::Hash<1>,edm::ParameterSetBlob> is available
Unfortunately, I don’t have access to the code that generates the input root file, only the input root file.
Thank you for the help in advance

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2

I guess @pcanal can help you.

3

Hi,

You may try with this function TFile::MakeProject

For example,

root  input_file.root
[0] _file0->MakeProject("kk")

It will generate all the files you need later to inspect the file.

If you are just interested in a Tree, you can do something more specific, using the function TTree::MakeClass

root  input_file.root
[0] t = (TTree*)_file0->Get("my_tree")
[1] t->MakeClass("kk")

It will generate the skeleton for reading the input file. The comments inside the generated files explain how to use them.

In both cases, I think dictionaries will be made when you compile the output files of the ROOT functions.

I hope it helps,
Alvaro.

4

Dear @couet and @atd ,
It worked!
Thank you for your help.

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