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.EntryPointNotFoundException' 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_call,
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("levelreader.DLL",EntryPoint="DllMain")]
private static extern bool LevelOpen(string 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]]

"Ady" <ad**********@tcm.co.uk> wrote in message news:%2******************@TK2MSFTNGP09.phx.gbl...

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.EntryPointNotFoundException' occurred
in TestApp2.exe

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

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

Willy.

[Ady]

Hi,

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

Thanks

Ady.

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:e4**************@TK2MSFTNGP12.phx.gbl...

"Ady" <ad**********@tcm.co.uk> wrote in message news:%2******************@TK2MSFTNGP09.phx.gbl...

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.EntryPointNotFoundException' occurred in TestApp2.exe

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

Remove the Entrypoint from the DllImport declarations. Please read the

doc's <ms-help://MS.MSDNQTR.2003JUL.1033/cpguide/html/cpconentrypointobjectfield.h
tm> carefully, Entrypoint refers to the function name entry not DllMain.

Willy.

[Willy Denoyette [MVP]]

Online MSDN library.

http://msdn.microsoft.com/library/de...bjectfield.asp

[Ady]

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

Thanks

Ady.

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...

Online MSDN library.

http://msdn.microsoft.com/library/de...bjectfield.asp

[Mattias Sjögren]

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

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/
Please reply only to the newsgroup.