> > I would like to know how to retrieve the online data during the experiment so 
> > that I can create my own custom plot. I execute my own frontend.exe to start the 
> > experiment. I can get a midas file after the experiment, but I am not sure about 
> > how to retrieve the online data. I know that rootana can help us to get the 
> > online plots, but the instructions in rootana is not clear. Can anyone give me 
> > some suggestion?  Thank you.
> 
> The current package for analyzing MIDAS data is the "m" analyzer, usually in the manalyzer subdirectory of your midas package, 
> but it can also be used stand-alone without MIDAS.
> 
> There is several examples:
> 
> manalyzer_example_cxx.cxx - a simple "c++" example shows how to extra midas bank data
> manalyzer_example_root.cxx - how to create ROOT histograms (that you can see online using jsroot)
> manalyzer_example_root_graphics.cxx - how to create a ROOT graphical program (obsoleted by jsroot, but still possible)
> manalyzer_example_flow*.cxx - more advanced examples on using a flow analyzer
> 
> Documentation is in README.md
> 
> Unfortunately there is no tutorial or 5 min youtube explainer, each experiment needs are very different, there is no way to 
> write a one-size-fits-all recipe.
> 
> Please take a look at the existing examples first, then send me a PM with any additional questions (or ask here). If you can 
> explain what kind of data you have and how you want to look at it, I should be able to guide you through writing an appropriate 
> manalyzer module.
> 
> K.O.

Dear K.O.
I would like to create some online plots (also reading the mid) when the frontend code is running. I may try to break the task into small steps first.
In the frontend.cxx, I have a bank called "TDC0" which includes an array of integer. The code is as follow:

bk_create(pevent, "TDC0", TID_INT, (void**) &pdata);
for(int i =0; i<ch; ++i)
*pdata++ = data[i];
bk_close(pevent,pdata);

In the meantime, I want to run manalyzer to get some plots.