dllimport problem

[=?Utf-8?B?RGlvZ28gQWx2ZXM=?=]

greentings

I have a unmanaged dll that I need to use on my C# app. The problem is that
the dll may be in diferent places... The only way I have to get the location
of the dll is getting a key on the registry.

How can I use dllimport to a variable location?
or
There is another way to do this task?

I just need to load some methods from the dll...

Thanks in advance

[Tom Spink]

Diogo Alves wrote:

greentings

I have a unmanaged dll that I need to use on my C# app. The problem is
that the dll may be in diferent places... The only way I have to get the
location of the dll is getting a key on the registry.

How can I use dllimport to a variable location?
or
There is another way to do this task?

I just need to load some methods from the dll...

Thanks in advance

Hi,

How can I use dllimport to a variable location?

Unfortunately you cannot (not at runtime).

There is another way to do this task?

Yes.. but it's quite a lot more involved. It requires you to use the
LoadLibrary API to dynamically load the DLL into memory, then locate the
entry-point of the function(s) you require.

Once you have the addresses of the entry points, you then need to invoke
them, something I'll admit I don't know how to do in C#, having only done
this using C++.

Nothing creative immediately springs to mind, however I'm sure a quick
Google (and the help of Windows experts in this group!) will help with
that.

--
Tom Spink
University of Edinburgh

[=?Utf-8?B?RGlvZ28gQWx2ZXM=?=]

I would really like to see a example... I'm not finding a solution here
"Tom Spink" wrote:

Diogo Alves wrote:

greentings

I have a unmanaged dll that I need to use on my C# app. The problem is
that the dll may be in diferent places... The only way I have to get the
location of the dll is getting a key on the registry.

How can I use dllimport to a variable location?
or
There is another way to do this task?

I just need to load some methods from the dll...

Thanks in advance

Hi,

How can I use dllimport to a variable location?

Unfortunately you cannot (not at runtime).

There is another way to do this task?

Yes.. but it's quite a lot more involved. It requires you to use the
LoadLibrary API to dynamically load the DLL into memory, then locate the
entry-point of the function(s) you require.

Once you have the addresses of the entry points, you then need to invoke
them, something I'll admit I don't know how to do in C#, having only done
this using C++.

Nothing creative immediately springs to mind, however I'm sure a quick
Google (and the help of Windows experts in this group!) will help with
that.

--
Tom Spink
University of Edinburgh

[Tom Spink]

Diogo Alves wrote:

I would really like to see a example... I'm not finding a solution here
"Tom Spink" wrote:

>Diogo Alves wrote:

greentings

I have a unmanaged dll that I need to use on my C# app. The problem is
that the dll may be in diferent places... The only way I have to get
the location of the dll is getting a key on the registry.

How can I use dllimport to a variable location?
or
There is another way to do this task?

I just need to load some methods from the dll...

Thanks in advance

Hi,

How can I use dllimport to a variable location?

Unfortunately you cannot (not at runtime).

There is another way to do this task?

Yes.. but it's quite a lot more involved. It requires you to use the
LoadLibrary API to dynamically load the DLL into memory, then locate the
entry-point of the function(s) you require.

Once you have the addresses of the entry points, you then need to invoke
them, something I'll admit I don't know how to do in C#, having only done
this using C++.

Nothing creative immediately springs to mind, however I'm sure a quick
Google (and the help of Windows experts in this group!) will help with
that.

--
Tom Spink
University of Edinburgh

Hi,

Please try googling! I typed "C# LoadLibrary" into Google, and got exactly
what you were looking for, as the first result:

http://www.codeproject.com/csharp/dyninvok.asp

Note: This solution may require some C knowledge.

--
Tom Spink
University of Edinburgh