RE: Dll's Basic Question
- From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Thu, 28 Aug 2008 08:31:34 -0700
I found this and though if your reading about dll's it's a good page to read
it explains the differences better than I have seen.
http://www.thevbzone.com/l_dll.htm
I am not sure how you would tell them apart except for trying to register
one with regserver32. or looking in visual studio or some IDE to see where
they are listed. Being that they are listed separately there has to be a
programmatic way to tell them apart but I have not been able to find one on
line quickly.
Ken
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of
james.homme@xxxxxxxxxxxx
Sent: Thursday, August 28, 2008 4:46 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Dll's Basic Question
Hi,
How do you know what kind of dll it is?
Thanks.
Jim
James D Homme, Usability Engineering, Highmark Inc.,
james.homme@xxxxxxxxxxxx, 412-544-1810
"The difference between those who get what they wish for and those who don't
is action. Therefore, every action you take is a complete success,regardless
of the results." -- Jerrold Mundis Highmark internal only: For usability and
accessibility:
http://highwire.highmark.com/sites/iwov/hwt093/
"Jamal Mazrui"
<empower@xxxxxxxx
t> To
Sent by: programmingblind@xxxxxxxxxxxxx
programmingblind- cc
bounce@freelists.
org Subject
RE: Dll's Basic Question
08/28/2008 07:40
AM
Please respond to
programmingblind@
freelists.org
Also, a DLL can be a COM server rather than a Win32 API type of DLL. In
that case, a COM browser will list its name (if it is registered), and you
can browse its objects, properties, methods, and events. Finally, a DLL can
be a .NET assembly, and certain .NET utilities can let you similarly browse
the objects it defines.
Jamal
On Wed, 27 Aug 2008, Ken Perry
wrote:
> Date: Wed, 27 Aug 2008 23:20:20 -0700
> From: Ken Perry <whistler@xxxxxxxxxxxxx>
> Reply-To: programmingblind@xxxxxxxxxxxxx
> To: programmingblind@xxxxxxxxxxxxx
> Subject: RE: Dll's Basic Question
>
>
> Jim asked,
> "Hi,
> If you see a dll on your system, how do you discover what it is
> capable
of
> doing?"
>
> You can list function names for a specific DLL, such as user32.dll, by
> running a variety of command-line tools. For example, you can use
> dumpbin /exports user32.dll or link /dump /exports user32.dll to
> obtain function names.
> Jim asked,
> " Here's a related question. If you are using VisualBasic or some
> environment and you tell the environment to include a library.
> are you connecting your project to a dll?"
> In most cases yes your using a dll but it depends if the library is a
> dll
or
> a static link library as you will find in a lot of c and c++ projects.
If
> your using Visual basic most of the time it's a dll that your linking
unless
> you do some magic to make sure your not.
>
>
> Jim ask,
> "Related to that, if you are using PHP, and you uncomment one of the
> extension lines in php.ini, assuming that doing that makes it connect
> to
a
> dll, what actually is happening behind the scenes? If you answer, can
> you please phrase the answer in plain language?"
>
> Well first off I have not studied the plane language and I could not
> find
a
> compiler for it so I will have to try my best to fake it. Assuming
> that
it
> does include a dll what it does is link that dll in to the binary and
allow
> the scripts access to the exported functions. I guess the plane
> language description of what is going on is if you had a building of
> rooms with
files
> in all the rooms and a central group of file clerks. Lets say there
> are
100
> rooms of file cabinets. When php starts up it has access to the
> default
25
> rooms and that is all your file clerks have keys to. So when you tell
them
> to search for a file they run through all the 25 rooms and if they
> don't find the file your looking for they come back pretty quick and tell
you.
> Then when you uncomment that dll in the init file you give those
> clerks a key to another room. Now they can run through that room and
> check for
your
> file. If the file your looking for is in the new room you can now
> access it. Note we didn't build another room that room is there
> already. In contrast if you linked a static library in you would have
> to hire a contractor to knock out a wall and connect a new room to the
building.
The
> nice part is though you can have them build it really close to the
> clerks office and thus make it faster to search than a dll not much
> faster but
it
> can be faster but it would definitely take up more space.
>
> That description really does not explain it because every program can
access
> the dll just as fast as each other where as in my description of a
building
> you would have to use different universal dimensions to pull off how
> different programs access the same dll.
>
> Now if I have not confused you to much I think I answered your questions.
>
> Ken
>
>
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