How to call C from C# Web Service?

[Siegfried Heintze]

I have the following C# code in my web service:

[DllImport ("CaseAssessment.dll",
CallingConvention=CallingConvention.Cdecl)] public static extern double
add_(double X, double Y );

[WebMethod] public double add (double X, double Y){

return add_(X, Y);

}

When I try to call the add function from my C# SOAP client it comes back and
tells me it (I presume the server) cannot load the DLL. Quite some time ago
someone responded to my query on one of these mailing lists and informed me
that she thought the rules for loading a DLL from a web service included
looking in the current directory (which is not the default directory for
IIS/InetInfo/ASP.NET).

Is this incorrect? How do I load a DLL from a web service with P/Invoke?

Siegfried

[Eric Cherng]

Siegfried,

An ASP.NET web service running in IIS will typically run under the ASP.NET
user process. In Windows XP or Windows 2000, this user name is typically
MACHINENAME\ASPNET. If you're running in IIS6 on Windows 2003, then it's
NETWORK_SERVICE. You should make sure that user account has the correct
security access to your DLL file. Also try putting your DLL in the \bin
folder of the web service folder.

Eric
"Siegfried Heintze" <si*******@heintze.com> wrote in message
news:e4**************@TK2MSFTNGP11.phx.gbl...

I have the following C# code in my web service:

[DllImport ("CaseAssessment.dll",
CallingConvention=CallingConvention.Cdecl)] public static extern double
add_(double X, double Y );

[WebMethod] public double add (double X, double Y){

return add_(X, Y);

}

When I try to call the add function from my C# SOAP client it comes back and tells me it (I presume the server) cannot load the DLL. Quite some time ago someone responded to my query on one of these mailing lists and informed me that she thought the rules for loading a DLL from a web service included
looking in the current directory (which is not the default directory for
IIS/InetInfo/ASP.NET).

Is this incorrect? How do I load a DLL from a web service with P/Invoke?

Siegfried

[Siegfried Heintze]

Thanks Eric,
I put it in the bin directory that was created by Visual Studio.net when I
deployed the service originally.

I used ftp with an ls -l and determined the protections are the same as the
dll Visual Studio deployed.

Here is my error message:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>System.Web.Services.Protocols.SoapExc eption: Server was
unable to process request. ---&gt; System.DllNotFoundException: Unable to
load DLL (c:\inetpub\heintze\AnalyzeResults\bin\CaseAssessm ent.dll).
at AnalyzeResults.Service1.addr_(Double&amp; X, Double&amp; Y)
at AnalyzeResults.Service1.addr(Double&amp; X, Double&amp; Y)
--- End of inner exception stack trace ---</faultstring>
<detail />
</soap:Fault>
</soap:Body>
</soap:Envelope><br>


"Eric Cherng" <ericch1@remove_the_dot-hotmai.l.com> wrote in message
news:#t**************@TK2MSFTNGP09.phx.gbl...

Siegfried,

An ASP.NET web service running in IIS will typically run under the ASP.NET
user process. In Windows XP or Windows 2000, this user name is typically
MACHINENAME\ASPNET. If you're running in IIS6 on Windows 2003, then it's
NETWORK_SERVICE. You should make sure that user account has the correct
security access to your DLL file. Also try putting your DLL in the \bin
folder of the web service folder.

Eric
"Siegfried Heintze" <si*******@heintze.com> wrote in message
news:e4**************@TK2MSFTNGP11.phx.gbl...

I have the following C# code in my web service:

[DllImport ("CaseAssessment.dll",
CallingConvention=CallingConvention.Cdecl)] public static extern double
add_(double X, double Y );

[WebMethod] public double add (double X, double Y){

return add_(X, Y);

}

When I try to call the add function from my C# SOAP client it comes back

and

tells me it (I presume the server) cannot load the DLL. Quite some time

ago

someone responded to my query on one of these mailing lists and informed

me

that she thought the rules for loading a DLL from a web service included
looking in the current directory (which is not the default directory for
IIS/InetInfo/ASP.NET).

Is this incorrect? How do I load a DLL from a web service with P/Invoke?

Siegfried

[Eric Cherng]

Siegfried,

How about first writing a simple Console app to test your DLL to make sure
that P/Invoke is working properly and can load your DLL. If the Console app
works, then at least you can rule out that problem and you'll know the
problem has something todo with IIS.

Eric
"Siegfried Heintze" <si*******@heintze.com> wrote in message
news:%2****************@TK2MSFTNGP09.phx.gbl...

Thanks Eric,
I put it in the bin directory that was created by Visual Studio.net when I
deployed the service originally.

I used ftp with an ls -l and determined the protections are the same as the dll Visual Studio deployed.

Here is my error message:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>System.Web.Services.Protocols.SoapExc eption: Server was
unable to process request. ---&gt; System.DllNotFoundException: Unable to
load DLL (c:\inetpub\heintze\AnalyzeResults\bin\CaseAssessm ent.dll).
at AnalyzeResults.Service1.addr_(Double&amp; X, Double&amp; Y)
at AnalyzeResults.Service1.addr(Double&amp; X, Double&amp; Y)
--- End of inner exception stack trace ---</faultstring>
<detail />
</soap:Fault>
</soap:Body>
</soap:Envelope><br>


"Eric Cherng" <ericch1@remove_the_dot-hotmai.l.com> wrote in message
news:#t**************@TK2MSFTNGP09.phx.gbl...

Siegfried,

An ASP.NET web service running in IIS will typically run under the ASP.NET user process. In Windows XP or Windows 2000, this user name is typically MACHINENAME\ASPNET. If you're running in IIS6 on Windows 2003, then it's NETWORK_SERVICE. You should make sure that user account has the correct
security access to your DLL file. Also try putting your DLL in the \bin
folder of the web service folder.

Eric
"Siegfried Heintze" <si*******@heintze.com> wrote in message
news:e4**************@TK2MSFTNGP11.phx.gbl...

I have the following C# code in my web service:

[DllImport ("CaseAssessment.dll",
CallingConvention=CallingConvention.Cdecl)] public static extern double add_(double X, double Y );

[WebMethod] public double add (double X, double Y){

return add_(X, Y);

}

When I try to call the add function from my C# SOAP client it comes back

and

tells me it (I presume the server) cannot load the DLL. Quite some

time ago

someone responded to my query on one of these mailing lists and

informed me

that she thought the rules for loading a DLL from a web service

included looking in the current directory (which is not the default directory for IIS/InetInfo/ASP.NET).

Is this incorrect? How do I load a DLL from a web service with P/Invoke?
Siegfried

[Siegfried Heintze]

Thanks Eric. I've done that and the calls seem to be correct.

"Eric Cherng" <ericch1@remove_the_dot-hotmai.l.com> wrote in message
news:#e*************@tk2msftngp13.phx.gbl...

Siegfried,

How about first writing a simple Console app to test your DLL to make sure
that P/Invoke is working properly and can load your DLL. If the Console app works, then at least you can rule out that problem and you'll know the
problem has something todo with IIS.

Eric
"Siegfried Heintze" <si*******@heintze.com> wrote in message
news:%2****************@TK2MSFTNGP09.phx.gbl...

Thanks Eric,
I put it in the bin directory that was created by Visual Studio.net when I

deployed the service originally.

I used ftp with an ls -l and determined the protections are the same as

the

dll Visual Studio deployed.

Here is my error message:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>System.Web.Services.Protocols.SoapExc eption: Server was unable to process request. ---&gt; System.DllNotFoundException: Unable to load DLL (c:\inetpub\heintze\AnalyzeResults\bin\CaseAssessm ent.dll).
at AnalyzeResults.Service1.addr_(Double&amp; X, Double&amp; Y)
at AnalyzeResults.Service1.addr(Double&amp; X, Double&amp; Y)
--- End of inner exception stack trace ---</faultstring>
<detail />
</soap:Fault>
</soap:Body>
</soap:Envelope><br>


"Eric Cherng" <ericch1@remove_the_dot-hotmai.l.com> wrote in message
news:#t**************@TK2MSFTNGP09.phx.gbl...

Siegfried,

An ASP.NET web service running in IIS will typically run under the

ASP.NET user process. In Windows XP or Windows 2000, this user name is typically MACHINENAME\ASPNET. If you're running in IIS6 on Windows 2003, then it's NETWORK_SERVICE. You should make sure that user account has the correct security access to your DLL file. Also try putting your DLL in the \bin folder of the web service folder.

Eric
"Siegfried Heintze" <si*******@heintze.com> wrote in message
news:e4**************@TK2MSFTNGP11.phx.gbl...
> I have the following C# code in my web service:
>
> [DllImport ("CaseAssessment.dll",
> CallingConvention=CallingConvention.Cdecl)] public static extern double > add_(double X, double Y );
>
> [WebMethod] public double add (double X, double Y){
>
> return add_(X, Y);
>
> }
>
> When I try to call the add function from my C# SOAP client it comes back and
> tells me it (I presume the server) cannot load the DLL. Quite some time ago
> someone responded to my query on one of these mailing lists and informed me
> that she thought the rules for loading a DLL from a web service included > looking in the current directory (which is not the default directory for > IIS/InetInfo/ASP.NET).
>
> Is this incorrect? How do I load a DLL from a web service with P/Invoke? >
> Siegfried
>
>

[DotNetJunkies User]

Hey i have same problem. Did you find the solution. Pl. mail me at ss********@bloomberg.com. Thanks.

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[DotNetJunkies User]

Ugghh... I finally figured this out with the help of Microsoft Tech support.

The Administrator need to grant me (the siegfried account) access to the ASP.NET temporary directory (somewhere down in the bowels of the WINNT direcotry). Then I had to use the web.config file to impersonate the siegfied account.

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