Strange error using a dll

[Torben Laursen]

Hi

I have a dll written in C++ builder that I have been using for several years
by calling it using VBA or C++ from VS.

But I cannot use it from a C# program. When I try to use a function inside
it I get this strange exception:
Unable to load DLL 'DB_Forms.dll': Invalid access to memory location.
(Exception from HRESULT: 0x800703E6)

Can anyone give me some hints on what may be wrong?

PS I am using VS2005

Thanks Torben

[Peter Bromberg [C# MVP]]

RE: Strange error using a dll

Did you set a reference to this using the COM tab from Add References, and
make your call against the generated Interop assembly?
Peter

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"Torben Laursen" wrote:

Hi
>
I have a dll written in C++ builder that I have been using for several years
by calling it using VBA or C++ from VS.
>
But I cannot use it from a C# program. When I try to use a function inside
it I get this strange exception:
Unable to load DLL 'DB_Forms.dll': Invalid access to memory location.
(Exception from HRESULT: 0x800703E6)
>
Can anyone give me some hints on what may be wrong?
>
PS I am using VS2005
>
Thanks Torben
>
>
>

[Chris Dunaway]

Re: Strange error using a dll


Torben Laursen wrote:

Hi
>
I have a dll written in C++ builder that I have been using for several years
by calling it using VBA or C++ from VS.
>
But I cannot use it from a C# program. When I try to use a function inside
it I get this strange exception:
Unable to load DLL 'DB_Forms.dll': Invalid access to memory location.
(Exception from HRESULT: 0x800703E6)
>
Can anyone give me some hints on what may be wrong?
>
PS I am using VS2005
>
Thanks Torben

What is the function signature of the function inside the .dll and what
is the corresponding C# p/invoke signature you are using?