Single instance DLL

[Nak]

Hi there,

I am attempting to make a single instance DLL in C++. This means that I
only want 1 copy to be loaded at any time and the DLL's data is shared
throughout processes.

For example, I have a VB.NET app connecting to my DLL and calling a
function called addOne in the DLL, this then adds 1 to a static integer in
the DLL and returns the value. The problem is that if I load 2 instances of
the VB.NET app then I get 2 instance of the DLL loaded with completely
different values for the "static integer" in the DLL. I know that this was
quite an easy thing to achieve in VB6 via the project properties, but how
would I go about achieving this in Visual Studio .NET 2003 with a C++
project?

Thanks loads in advance!

Nak.

[tom_usenet]

On Tue, 8 Jun 2004 10:53:01 +0100, "Nak" <[e-mail]> wrote:

Hi there,

I am attempting to make a single instance DLL in C++. This means that I
only want 1 copy to be loaded at any time and the DLL's data is shared
throughout processes.

For example, I have a VB.NET app connecting to my DLL and calling a
function called addOne in the DLL, this then adds 1 to a static integer in
the DLL and returns the value. The problem is that if I load 2 instances of
the VB.NET app then I get 2 instance of the DLL loaded with completely
different values for the "static integer" in the DLL. I know that this was
quite an easy thing to achieve in VB6 via the project properties, but how
would I go about achieving this in Visual Studio .NET 2003 with a C++
project?

Thanks loads in advance!

Take a look at KB Q109619.

http://support.microsoft.com/default...b;en-us;109619

Tom
--
C++ FAQ: http://www.parashift.com/c++-faq-lite/
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html

[Nak]

Thanks Tom, this looks like it is going to be most helpful.

Nak.

"tom_usenet" <to********@hotmail.com> wrote in message
news:fq********************************@4ax.com...

On Tue, 8 Jun 2004 10:53:01 +0100, "Nak" <[e-mail]> wrote:

Hi there,

I am attempting to make a single instance DLL in C++. This means that Ionly want 1 copy to be loaded at any time and the DLL's data is shared
throughout processes.

For example, I have a VB.NET app connecting to my DLL and calling a
function called addOne in the DLL, this then adds 1 to a static integer inthe DLL and returns the value. The problem is that if I load 2 instances ofthe VB.NET app then I get 2 instance of the DLL loaded with completely
different values for the "static integer" in the DLL. I know that this wasquite an easy thing to achieve in VB6 via the project properties, but how
would I go about achieving this in Visual Studio .NET 2003 with a C++
project?

Thanks loads in advance!

Take a look at KB Q109619.

http://support.microsoft.com/default...b;en-us;109619

Tom
--
C++ FAQ: http://www.parashift.com/c++-faq-lite/
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html