Hi,

I have a C exported function in a DLL that has the following proto-type:
int _cdecl MyFunction( LPCSTR fmt, ... );

Does anyone know the DllImport declaration for this so that I can call this
in C#?

Thanks.

Leon

Try the 'params' keyword.
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"Leon" wrote:

> Hi,
>
> I have a C exported function in a DLL that has the following proto-type:
> int _cdecl MyFunction( LPCSTR fmt, ... );
>
> Does anyone know the DllImport declaration for this so that I can call this
> in C#?
>
> Thanks.
>
> Leon

I know about using param in C#. But can you read my question carefully?

How to you declare [DllImport(....)] in C# for a C function that takes var
args like:

int _cdecl DoSomething( int abc, ... );

Thanks.

Leon

"David Anton" wrote:

> Try the 'params' keyword.
> --
> http://www.tangiblesoftwaresolutions.com
> C++ to C#
> C++ to VB
> C++ to Java
> VB to Java
> Java to VB & C#
> Instant C#: VB to C#
> Instant VB: C# to VB
> Instant C++: VB, C#, or Java to C++/CLI
>
>
> "Leon" wrote:
>
> > Hi,
> >
> > I have a C exported function in a DLL that has the following proto-type:
> > int _cdecl MyFunction( LPCSTR fmt, ... );
> >
> > Does anyone know the DllImport declaration for this so that I can call this
> > in C#?
> >
> > Thanks.
> >
> > Leon

> How to you declare [DllImport(....)] in C# for a C function that takes var
> args like:
>
> int _cdecl DoSomething( int abc, ... );

You can't do a single declaration for the function. Instead you have to do a
separate declaration for each set of arguments you want to call it with. See
http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.dllimportattribute.callingconvention(VS.71).aspx
which has an example of how to call printf from C#.

Chris Jobson

Thanks.

Your answer and reference actually confirm that my declaration has not been
at fault.

Leon

"Chris Jobson" wrote:

> > How to you declare [DllImport(....)] in C# for a C function that takes var
> > args like:
> >
> > int _cdecl DoSomething( int abc, ... );
>
> You can't do a single declaration for the function. Instead you have to do a
> separate declaration for each set of arguments you want to call it with. See
> http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.dllimportattribute.callingconvention(VS.71).aspx
> which has an example of how to call printf from C#.
>
> Chris Jobson
>
>
>