I have the following C# code in my web service:
[DllImport ("CaseAssessmen t.dll",
CallingConventi on=CallingConve ntion.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
6  9083 
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\ASP NET. 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*******@hein tze.com> wrote in message
news:e4******** ******@TK2MSFTN GP11.phx.gbl... I have the following C# code in my web service:
[DllImport ("CaseAssessmen t.dll",
CallingConventi on=CallingConve ntion.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
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:Envelop e xmlns:soap="htt p://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>Sy stem.Web.Servic es.Protocols.So apException: Server was
unable to process request. ---> System.DllNotFo undException: Unable to
load DLL (c:\inetpub\hei ntze\AnalyzeRes ults\bin\CaseAs sessment.dll).
at AnalyzeResults. Service1.addr_( Double& X, Double& Y)
at AnalyzeResults. Service1.addr(D ouble& X, Double& 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******** ******@TK2MSFTN GP09.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\ASP NET. 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*******@hein tze.com> wrote in message
news:e4******** ******@TK2MSFTN GP11.phx.gbl... I have the following C# code in my web service:
[DllImport ("CaseAssessmen t.dll",
CallingConventi on=CallingConve ntion.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,
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*******@hein tze.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.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:Envelop e xmlns:soap="htt p://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>Sy stem.Web.Servic es.Protocols.So apException: Server was
unable to process request. ---> System.DllNotFo undException: Unable to
load DLL (c:\inetpub\hei ntze\AnalyzeRes ults\bin\CaseAs sessment.dll).
at AnalyzeResults. Service1.addr_( Double& X, Double& Y)
at AnalyzeResults. Service1.addr(D ouble& X, Double& 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******** ******@TK2MSFTN GP09.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\ASP NET. 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*******@hein tze.com> wrote in message
news:e4******** ******@TK2MSFTN GP11.phx.gbl... I have the following C# code in my web service:
[DllImport ("CaseAssessmen t.dll",
CallingConventi on=CallingConve ntion.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
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******** *****@tk2msftng p13.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*******@hein tze.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.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:Envelop e xmlns:soap="htt p://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>Sy stem.Web.Servic es.Protocols.So apException: Server
was unable to process request. ---> System.DllNotFo undException: Unable
to load DLL (c:\inetpub\hei ntze\AnalyzeRes ults\bin\CaseAs sessment.dll).
at AnalyzeResults. Service1.addr_( Double& X, Double& Y)
at AnalyzeResults. Service1.addr(D ouble& X, Double& 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******** ******@TK2MSFTN GP09.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\ASP NET. 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*******@hein tze.com> wrote in message
news:e4******** ******@TK2MSFTN GP11.phx.gbl...
> I have the following C# code in my web service:
>
> [DllImport ("CaseAssessmen t.dll",
> CallingConventi on=CallingConve ntion.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
>
>
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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