well ok.. so adding section is maybe the way. but how to use buffer from another section? the exe is written in C. maybe somehow to read it's own pe header and get the entry point of the new section?

If adding a section is to problematic then you could consider putting your byte codes in a resource. Then your c-code can find the data using windows standard resource API's.

So anyway, then I should add a resource section, resize it and get the bytecode using api. I really prefer to read bytecode in the normal way, so there's 2 ways:

1. To move the import section upward and resize the code section -
The problem is that I'm using TCC (TinyC), and there's no such options.
2. Add a new section with the bytecode and then read it -
How to reach it using C? Self-reading PE code?

someone get me an idea how to do one of these

snify: There is no "normal way". What you are doing is not normal.

If you insist on adding a section then imghelp.dll may be useful to you. Google it, I've never used it but I know it exists.