[Boost-users] Can I config process_id to log file name in the .ini setting file using Boost.Log?

Hi, I am using Boost.Log to output log file and using .ini file to config it. Now I need to start the exe file from the same directory for more than two instance with different start id, something like this:

start my_app.exe 1 start my_app.exe 2

But currently only the first instance output the log content and the second one can't get the log file because the two exe uses the same log file. So I need to tell the app to use the different log file. So I want to config the .ini file to add process_id to the output file name, but I don't know how? I want to config the ini file like this but it failed:-( FileName="./log/mylog_%ProcessID%.log" Is there a way to add precess id to the output file name? Thanks.