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Dynamic Memory Addresses? Something else?

 
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Jinron
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PostPosted: Mon Nov 24, 2008 9:46 am    Post subject: Dynamic Memory Addresses? Something else? Reply with quote
Does DMA affect function entry point addresses as well? I've been having a problem with the addresses changing when I reboot my computer for the windows vista minesweeper game.

StartAboutDialog was at 0x00CAFED4, after rebooting it became 0x00C8FED4. Any ideas?

I was pretty certain that DMA changed addresses every time game was restarted, but this one only changes addresses when I reboot my computer. It's also different for different computers. The address is always something like 00C*FED4 though. only the * changes.
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Dark Byte
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PostPosted: Mon Nov 24, 2008 10:27 am    Post subject: Reply with quote
in vista the entry point can differ yes.
Thats why you have to use modulename+offset

And the reason why it differs only on boot is because windows likes to keep copies of modules at addresses after they have been loaded so they can be shared with other processes to increase speed. (so no need to go through the relocation table on opening) So only when it really HAS to it goes through the relocation
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Jinron
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PostPosted: Mon Nov 24, 2008 12:57 pm    Post subject: Reply with quote
Dark Byte wrote:
in vista the entry point can differ yes.
Thats why you have to use modulename+offset

And the reason why it differs only on boot is because windows likes to keep copies of modules at addresses after they have been loaded so they can be shared with other processes to increase speed. (so no need to go through the relocation table on opening) So only when it really HAS to it goes through the relocation


EDIT: Ignore the below questions. I figured it out on my own.

Does this apply even if the function is part of a EXE and not a DLL? I'm trying to hook the StartAboutBoxDialog function (triggered when you do help -> about in minesweeper).

If so, if it's an EXE, how would I determine the base address to add the offset to?
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