How to make a GBA emulator?

Well... Making an emulator is not my final goal. I need to extract sprites, map data, game stats and other information from one specific game.

I downloaded Visual Boy Advanced source code. And it was really complicated, I could not even understand. It will be great if I can find document on how GBA operates and its opcodes...

C++ is my main language, and I can write programs in Assembly Language as well. I got the basic understanding, such as stack frame, opcodes, registers, etc. Does anyone know where to get started?

Great start. But a few things:
- Don't think talking about ROMS/Emulators is allowed here
- Don't make an emulator. There are already emulators out there, and they have teams of people working on them. Find some other project.

Negative, tagmanadvance, it's perfectly legit to talk about how to go about writing an emulator. We aren't posting anything illegal here.

There's no need for another GBA emulator, but the question is still valid. How would one get started on it?

If you had read his post correctly you would have seen that he doesn't want to make an emulator, he wants to create a program that will extract data from a certain game. Well, that's my interpretation.

If that's all he wants to do, couldn't he just create a program that rips apart the rom file, extracts certain parts, then saves them in their corresponding encodings/filetypes? Seeing as it is just one game?