Native dll in c# web app

[Sebastian Schmittner]

Hi Peter,

try like this
http://cboard.cprogramming.com/csharp-programming/126794-my-zlib1-dll-wrapper-no-does-not-work-net-4-0-a.html

Maybe it is only the calling convention which fails.

To the other question, use DependencyWalker to see what functions those
DLLs export and what the signatures are of them.
http://www.dependencywalker.com

Hope this helps.

Best regards,
Sebatian
On 15 Jun 2016 16:49, "Peter via openslide-users" <
openslide-users at lists.andrew.cmu.edu> wrote:

> Hi Benjamin,
>
> Thanks for the answer, but this does not help. I copied the dll already
> manually or automatically with the solution, but on runtime, the dll are
> not found.
>
> The 20 dlls are
>
> iconv.dll
> libcairo-2.dll
> libffi-6.dll
> libgdk_pixbuf-2.0-0.dll
> libgio-2.0-0.dll
> libglib-2.0-0.dll
> libgmodule-2.0-0.dll
> libgobject-2.0-0.dll
> libgthread-2.0-0.dll
> libintl-8.dll
> libjpeg-62.dll
> libopenjp2.dll
> libopenslide-0.dll
> libpixman-1-0.dll
> libpng16-16.dll
> libsqlite3-0.dll
> libtiff-5.dll
> libxml2-2.dll
> openslide-jni.dll
> zlib1.dll
>
> Maybe I miss one?
>
> Another question related to that is:
>
> How can I DllImport those libraries? E.g. which function provides
> libcairo-2.dll?
>
> [DllImport("libcairo-2.dll")]
> private static extern whichFunctionshouldBeHere(WhichArguments);
>
>
> Best,
>  Peter
>
>
> -----Original Message-----
> From: openslide-users [mailto:openslide-users-bounces+schueffp=
> mskcc.org at lists.andrew.cmu.edu] On Behalf Of Benjamin Gilbert via
> openslide-users
> Sent: Wednesday, June 15, 2016 3:01 AM
> To: openslide-users at lists.andrew.cmu.edu
> Subject: Re: Native dll in c# web app
>
> On Mon, Jun 13, 2016 at 09:59:45PM +0000, Peter via openslide-users wrote:
> > I try to make a .net webapp for a openslide viewer.  Openslide depends
> > on
> > 20 native c++ libraries which i cannot reference in the c# project
> > (visual studio 2015).  (iconv.dll, libtiff-5.dll, ...)
> >
> > It keeps saying that those libraries are not a valid COM assembly.  Or
> > that they do not have an entry point.
> >
> > In a normal C# app, I simply would copy the dlls to the /bin folder.
> > Then they are loaded when the program starts.  However, this does not
> > work for a webapp (it keeps saying that openslide or one of its
> > dependencies is not found).
>
> Hi Peter,
>
> I'm not very familiar with Visual Studio, but you may be able to fix this
> by having it copy the DLLs for you:
>
>     http://stackoverflow.com/a/35960868/
>     http://stackoverflow.com/a/5107759/
>
> Does that work?
>
> --Benjamin Gilbert
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