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| Invoking a native DLL export |
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This message was discovered on microsoft.public.dotnet.framework.compactframework.
| Casper Hornstrup |
| GOOD ANSWER |
I'm having trouble with calling an exported function in a native DLL
compiled with eMbedded Visual C++ using C#.
Basicly, I have one exported function in the DLL:
#define NATIVE_API __declspec(dllexport)
extern "C" {
NATIVE_API int fnNative(void)
{
return 42;
}
}
and a C# client of the DLL:
using System;
using System.Data;
using System.Runtime.InteropServices;
namespace Client
{
class Class1
{
[ DllImport("native.dll", EntryPoint="fnNative") ]
public static extern int fnNative();
static void Main(string[] args)
{
Console.WriteLine("Call fnNative()");
int x = fnNative();
//int x = 7;
Console.WriteLine("fnNative() = " + x);
Console.ReadLine();
}
}
}
When run, I get "An unhandled exception of type
'System.MissingMethodException' occurred in Client.exe".
Dumpbin /exports of the DLL looks right: One export: _fnNative@0.
I have tried changing calling convention with no luck. I have successfully
called an export in coredll.dll using similar C# code,
so I'm possibly doing something wrong when creating the DLL?
Full project files are located here:
http://ch.wox.org/Native.zip
Thanks,
Casper
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| Mark Hurley |
| GOOD ANSWER |
Use dumpbin /exports (something like that) and see if your method is
correctly being exported, it will also tell you if the exported names are
being mangled.
What did you get?
Mark
"Casper Hornstrup" <Click here to reveal e-mail address> wrote in message
news:eoUGeR4JCHA.2552@tkmsftngp08...
[Original message clipped]
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| Casper Hornstrup |
| GOOD ANSWER |
Dumpbin /exports gives _fnNative@0
"Mark Hurley" <Click here to reveal e-mail address> wrote in message
news:#KnnJF5JCHA.1772@tkmsftngp09...
[Original message clipped]
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| Jorge@tutopia.com |
| GOOD ANSWER |
Casper Hornstrup <Click here to reveal e-mail address> escribió en el mensaje de noticias
uDgHWx#JCHA.1900@tkmsftngp11...
[Original message clipped]
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| PaulYao [eMVP] |
| GOOD ANSWER |
The name of your function is fnNative@0 (note that the "@0" is, in fact,
part of your fn name).
You need to do one of two things - I recommend #2, as I have never done #1 -
but it might give you a quick and dirty way to do this:
1) Change your C# code:
[Original message clipped]
2) Change your DLL:
2.1 Add a new file to your DLL project named "Myapp.Def" (the Myapp part is
not important, the ".def" is).
2.2 In that file, add the following lines:
EXPORTS
fnNative
Check you work by running dumpbin/exports (or depends.exe) to make sure that
the name is now "fnNative" and not fnNative@0.
Is this running on an actual device or on the emulator? If on an actual
device, are you sure that your DLL is present on the device?? (For that
matter, is it present on the emulator - the last time I tried the eVC++
emulator was different - that is it was a different process - from the one
started up by my .NETcf dev tools.)
My Best,
Paul
--
Paul Yao
The Paul Yao Company
http://www.paulyao.com
Power Programming Workshops
eCoaching for Programmers
Microsoft eMVP
"Click here to reveal e-mail address" <Click here to reveal e-mail address> wrote in message
news:#hoZk3kbCHA.1940@tkmsftngp11...
[Original message clipped]
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| Jorge@tutopia.com |
| GOOD ANSWER |
Casper Hornstrup <Click here to reveal e-mail address> escribió en el mensaje de noticias
uDgHWx#JCHA.1900@tkmsftngp11...
[Original message clipped]
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| Jorge@tutopia.com |
| GOOD ANSWER |
Casper Hornstrup <Click here to reveal e-mail address> escribió en el mensaje de noticias
uDgHWx#JCHA.1900@tkmsftngp11...
[Original message clipped]
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| Mark Hurley |
| GOOD ANSWER |
Use dumpbin /exports (something like that) and see if your method is
correctly being exported, it will also tell you if the exported names are
being mangled.
What did you get?
Mark
"Casper Hornstrup" <Click here to reveal e-mail address> wrote in message
news:eoUGeR4JCHA.2552@tkmsftngp08...
[Original message clipped]
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| Baccarin |
| GOOD ANSWER |
Casper,
Did you include a .def file in your eVC++ dll with your function name?
Baccarin.
"Casper Hornstrup" <Click here to reveal e-mail address> escreveu na mensagem
news:eoUGeR4JCHA.2552@tkmsftngp08...
[Original message clipped]
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| Casper Hornstrup |
| GOOD ANSWER |
If eVC is anything like Visual C++ this should not be necesarry when using
dllexport (and according to dumpbin it is exported). Does anyone
use .def files?
I tried creating an executable that will link to native.dll in eVC. It runs
fine in the Pocket PC
emulator that comes with eVT 3.0, but in the Pocket PC emulator that comes
with .NET Compact Framework
it will not run (complains about the application performing an illegal
operation).
Exception: 0xc0000005 @ address 00000000.
Casper
"Baccarin" <Click here to reveal e-mail address> wrote in message
news:u1kFxMIKCHA.668@tkmsftngp09...
[Original message clipped]
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| Mark Hurley |
| GOOD ANSWER |
Correct....in my eVC dll's I dropped the .def file all together in favor of
the __declspec(dllexport)... here is a sample method ... which works:
extern "C" int __declspec(dllexport) myIsScanSuspended(void)
{
return IsScanSuspended();
}
Casper -- just for trial and error....have you tried dropping the entry
point?
[Original message clipped]
I wonder if some sort of "bug" could be messing it up? All of my pInvoked
functions do not use the entry point, so I'm not sure if that is proven on
the "compact framework" to function correctly. You don't need it, as your
keeping your method name consistent. But you probably already knew that.
;)
Mark
"Casper Hornstrup" <Click here to reveal e-mail address> wrote in message
news:uWIW0sLKCHA.2060@tkmsftngp11...
[Original message clipped]
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| Casper Hornstrup |
| GOOD ANSWER |
"Mark Hurley" <Click here to reveal e-mail address> wrote in message
news:#n$MxQbKCHA.2324@tkmsftngp13...
> Correct....in my eVC dll's I dropped the .def file all together in favor
of
[Original message clipped]
Tried that with your example, same results. Do you have a simple example
with project files I could try (that works for you)?
Maybe I'm missing some configuration option somewhere.
Thanks,
Casper
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