Unmanaged DLL

[Ady]

Hi

I am trying to call a function in C# that I wrote in unmanaged C++.

I am getting the following error.

An unhandled exception of type 'System.EntryPo intNotFoundExce ption' occurred
in TestApp2.exe

Additional information: Unable to find an entry point named DllMain in DLL
levelreader.DLL .

My C++ looks like this

#include "stdafx.h"
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_c all,
LPVOID lpReserved
)
{
return TRUE;
}

bool fileLoaded = false;
FILE * levelHandle;
extern "C" {
bool LevelOpen(char* fileName);
};
bool LevelOpen(char * fileName)
{
return FALSE;
}

and my c# looks like this

namespace TestApp2
{
public class Level
{
bool levelOpen;
[DllImport("leve lreader.DLL",En tryPoint="DllMa in")]
private static extern bool LevelOpen(strin g fileName);
public Level()
{
levelOpen = false;
}

public bool Open(string fileName)
{
levelOpen = LevelOpen ( fileName );
return ( levelOpen );
}
}
}


Any reason for this exception?

Thanks

Ady.

[Willy Denoyette [MVP]]

Re: Unmanaged DLL



"Ady" <adrian.hirst@t cm.co.uk> wrote in message news:%23u%2309V DfDHA.2328@TK2M SFTNGP09.phx.gb l...[color=blue]
> Hi
>
> I am trying to call a function in C# that I wrote in unmanaged C++.
>
> I am getting the following error.
>
> An unhandled exception of type 'System.EntryPo intNotFoundExce ption' occurred
> in TestApp2.exe
>
> Additional information: Unable to find an entry point named DllMain in DLL
> levelreader.DLL .
>[/color]

Remove the Entrypoint from the DllImport declarations. Please read the doc's
<ms-help://MS.MSDNQTR.2003 JUL.1033/cpguide/html/cpconentrypoint objectfield.htm > carefully, Entrypoint refers to the function name
entry not DllMain.

Willy.

[Ady]

Re: Unmanaged DLL

Hi,

I do not have this document is it on the MSDN website as I cant find it

Thanks

Ady.

"Willy Denoyette [MVP]" <willy.denoyett e@pandora.be> wrote in message
news:e43YvaDfDH A.1212@TK2MSFTN GP12.phx.gbl...[color=blue]
>
>
> "Ady" <adrian.hirst@t cm.co.uk> wrote in message[/color]
news:%23u%2309V DfDHA.2328@TK2M SFTNGP09.phx.gb l...[color=blue][color=green]
> > Hi
> >
> > I am trying to call a function in C# that I wrote in unmanaged C++.
> >
> > I am getting the following error.
> >
> > An unhandled exception of type 'System.EntryPo intNotFoundExce ption'[/color][/color]
occurred[color=blue][color=green]
> > in TestApp2.exe
> >
> > Additional information: Unable to find an entry point named DllMain in[/color][/color]
DLL[color=blue][color=green]
> > levelreader.DLL .
> >[/color]
>
> Remove the Entrypoint from the DllImport declarations. Please read the[/color]
doc's[color=blue]
>[/color]
<ms-help://MS.MSDNQTR.2003 JUL.1033/cpguide/html/cpconentrypoint objectfield.h
tm> carefully, Entrypoint refers to the function name[color=blue]
> entry not DllMain.
>
> Willy.
>
>[/color]

[Willy Denoyette [MVP]]

Re: Unmanaged DLL

Online MSDN library.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconentrypointobjectfield.asp

[Ady]

Re: Unmanaged DLL

I have done what it says there but am still getting the exception anybody
help?

Thanks

Ady.

"Willy Denoyette [MVP]" <willy.denoyett e@pandora.be> wrote in message
news:%239ev1WEf DHA.1212@TK2MSF TNGP12.phx.gbl. ..[color=blue]
> Online MSDN library.
>
>[/color]
http://msdn.microsoft.com/library/de...bjectfield.asp[color=blue]
>
>[/color]

[Mattias Sjögren]

Re: Unmanaged DLL

[color=blue]
>I have done what it says there but am still getting the exception anybody
>help?[/color]

Try running Dumpbin.exe /exports on the DLL to see under what name the
function is actually exported.



Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org

http://www.msjogren.net/dotnet/

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