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[Delphi] Spying a value in an API (without hooking)

 
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h4c0r-BG
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PostPosted: Sun Nov 23, 2008 11:24 am    Post subject: [Delphi] Spying a value in an API (without hooking) Reply with quote
I want to spy permanently the value of glDisable which it holds without hooking the function itself because it makes FPS LAG in the game.

I've been wondering if there is a nicer way to do do it like "only spying it" without modifying the original API code.

The function holds only one cardinal value.

void glDisable(
GLenum cap
);


Any sugestions?
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Flyte
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PostPosted: Sun Nov 23, 2008 6:06 pm    Post subject: Reply with quote
The only way I can think of off hand would be to scan the stack of the target process for an address that would be the return from the call.

i.e:
Code:
push cap
call glDisable
blah blah blah // Find this return address on stack


You can then pull the value off the stack based on that assumption. Keep in mind the stack gets overwritten a lot, and as a whole this method is just a novelty. You did ask for a way other than hooking, amirite?
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BanMe
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PostPosted: Mon Nov 24, 2008 12:34 pm    Post subject: Reply with quote
Code:

*(WORD*)GlDisable = 0xcc;
WaitForDebugEvent();
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samuri25404
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PostPosted: Mon Nov 24, 2008 2:25 pm    Post subject: Reply with quote
BanMe wrote:
Code:

*(WORD*)GlDisable = 0xcc;
WaitForDebugEvent();

* ( BYTE * ) ?
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Flyte
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PostPosted: Mon Nov 24, 2008 10:03 pm    Post subject: Reply with quote
samuri25404 wrote:
BanMe wrote:
Code:

*(WORD*)GlDisable = 0xcc;
WaitForDebugEvent();

* ( BYTE * ) ?


This is still hooking, so shouldn't even be considered.
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&Vage
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PostPosted: Tue Nov 25, 2008 12:52 pm    Post subject: Reply with quote
Read the stacks of the call.
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