gamedevlists-windows

[GD-Windows] loading a dll from memory

[Gabor S. <ts...@co...>]

Hi,

Is there a way to load a dynamic library from the memory instead of
a file? I have the dynamic library in the memory and I don't want to
write it to the winchester and use LoadLibrary() if it isn't necessery...

Thanks for any replies!
  Gabor Simko

Re: [GD-Windows] loading a dll from memory

[Brian H. <bri...@py...>]

Off the top of my head I'm not sure of a way, but you might want to look at 
GetModuleHandleEx(), which accepts the 
GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS flag which, from what I can read, 
lets you get a module handle from a memory address you pass in lieu of a 
module name.  From the module handle you can call GetProcAddress(), etc.

Brian

At 11:55 PM 1/20/2002 +0100, Gabor Simko wrote:
>Hi,
>
>Is there a way to load a dynamic library from the memory instead of
>a file? I have the dynamic library in the memory and I don't want to
>write it to the winchester and use LoadLibrary() if it isn't necessery...
>
>Thanks for any replies!
>   Gabor Simko
>
>
>
>
>
>_______________________________________________
>Gamedevlists-windows mailing list
>Gam...@li...
>https://lists.sourceforge.net/lists/listinfo/gamedevlists-windows

Re: [GD-Windows] loading a dll from memory

[Ben C. <be...@gu...>]

On Sunday, January 20, 2002, 10:55:56 PM, someone wrote:

> Hi,

> Is there a way to load a dynamic library from the memory instead of
> a file? I have the dynamic library in the memory and I don't want to
> write it to the winchester and use LoadLibrary() if it isn't necessery...

 Unfortunately, I believe this isn't possible, due to the way Windows
handles shared areas of DLLs by memory-mapping to the file itself - I
certainly looked around for a way to do it a couple of years ago back
and couldn't find one.

 That said, if you just want to load a simple DLL you've created (ie
no sharing between instances, etc), then I think it's fairly
straightforward to implement your own PE format loader -
http://www.winehq.org/ would probably be a good place to look if you
did decide to try that.

-- 
Ben Carter - Neko Technologies - be...@gu...
http://www.neko-tech.com/ - http://www.absoluteterror.com/
---------------------------------PGP Key available on request---
"Broken mirror, a million shades of light,
 the old echo fades away. 
 But just you and I can find the answer, 
 and then we can run to the end of the world."
                                - Small of two pieces, Xenogears

RE: [GD-Windows] loading a dll from memory

[Matt D. <ma...@co...>]

Hi,

It is possible.  We did it once in a company I worked for.  We had the
ability to pack dll's and an exe into one exe which was compressed.  A stub
decompressed the executables in memory.  I cannot remember the exact details
as it was done by another programmer at out company but I can remember it
being a pain in the butt and it was done through low-level trickery (needing
knowledge of the PE32 format) rather than any Win32 API calls.

Sorry I'm not much help, but I know it is possible.


Matt Davies
Programmer, Confounding Factor
ma...@co...
www.confounding-factor.com




-----Original Message-----
From: gam...@li...
[mailto:gam...@li...]On Behalf Of
Ben Carter
Sent: 21 January 2002 01:16
To: gamedev-windows
Subject: Re: [GD-Windows] loading a dll from memory


On Sunday, January 20, 2002, 10:55:56 PM, someone wrote:

> Hi,

> Is there a way to load a dynamic library from the memory instead of
> a file? I have the dynamic library in the memory and I don't want to
> write it to the winchester and use LoadLibrary() if it isn't necessery...

 Unfortunately, I believe this isn't possible, due to the way Windows
handles shared areas of DLLs by memory-mapping to the file itself - I
certainly looked around for a way to do it a couple of years ago back
and couldn't find one.

 That said, if you just want to load a simple DLL you've created (ie
no sharing between instances, etc), then I think it's fairly
straightforward to implement your own PE format loader -
http://www.winehq.org/ would probably be a good place to look if you
did decide to try that.

--
Ben Carter - Neko Technologies - be...@gu...
http://www.neko-tech.com/ - http://www.absoluteterror.com/
---------------------------------PGP Key available on request---
"Broken mirror, a million shades of light,
 the old echo fades away.
 But just you and I can find the answer,
 and then we can run to the end of the world."
                                - Small of two pieces, Xenogears


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