Calling C# Methods in a Dll file from a unmanaged C++ Program

[Grant Stanley]

Im writting a program in unmanaged C++, and want to access a MS SQL
Database. I've done quite a lot of database access stuff in C# before so I'm
wanting to use C# for the database access in the program.

I want to write a C# DLL file where I can call methods from the C++ program
so that it can get data out of the database. The C++ program is only needing
to get a few things from the database so it's going to be simpler to just
use C# for this, and im not trying to create a wrapper for a lot of .NET
database functions or anything like that.

So how do I go about writting a C# Dll and accessing it from unmanaged C++?

Thank You for any help,
Grant

[Kevin Chandler]

Use tlbexp to generate a Com based wrapper for your .Net code. With the
wrapper, you can simply call your .Net code as though it was a COM object.

"Grant Stanley" <ag**@kent.ac.uk.delete> wrote in message
news:40*********************@lovejoy.zen.co.uk...

Im writting a program in unmanaged C++, and want to access a MS SQL
Database. I've done quite a lot of database access stuff in C# before so I'm wanting to use C# for the database access in the program.

I want to write a C# DLL file where I can call methods from the C++ program so that it can get data out of the database. The C++ program is only needing to get a few things from the database so it's going to be simpler to just
use C# for this, and im not trying to create a wrapper for a lot of .NET
database functions or anything like that.

So how do I go about writting a C# Dll and accessing it from unmanaged C++?
Thank You for any help,
Grant

[Oscar Thornell]

Kevin is absolutly correct that you need a COM callable wrapper to use .NET
code from the unmanged world...

I am just wondering why you can´t use C++ to access the database in the
first place? Somehow it seems kind of wrong to access the db through .NET if
you still are going to need C++ for the most part and only needs a few parts
from a db??

Anyway good luck!
/Oscar
"Grant Stanley" <ag**@kent.ac.uk.delete> wrote in message
news:40*********************@lovejoy.zen.co.uk...

Im writting a program in unmanaged C++, and want to access a MS SQL
Database. I've done quite a lot of database access stuff in C# before so I'm wanting to use C# for the database access in the program.

I want to write a C# DLL file where I can call methods from the C++ program so that it can get data out of the database. The C++ program is only needing to get a few things from the database so it's going to be simpler to just
use C# for this, and im not trying to create a wrapper for a lot of .NET
database functions or anything like that.

So how do I go about writting a C# Dll and accessing it from unmanaged C++?
Thank You for any help,
Grant

[Justin Rogers]

IL has attributes for exporting managed methods as C style method exports. If
you were
savvy, and didn't want to write a CCW you could probably work at the IL level to
export
your methods.
--
Justin Rogers
DigiTec Web Consultants, LLC.

"Oscar Thornell" <os***@cyberode.se> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Kevin is absolutly correct that you need a COM callable wrapper to use .NET
code from the unmanged world...

I am just wondering why you can´t use C++ to access the database in the
first place? Somehow it seems kind of wrong to access the db through .NET if
you still are going to need C++ for the most part and only needs a few parts
from a db??

Anyway good luck!
/Oscar
"Grant Stanley" <ag**@kent.ac.uk.delete> wrote in message
news:40*********************@lovejoy.zen.co.uk...

Im writting a program in unmanaged C++, and want to access a MS SQL
Database. I've done quite a lot of database access stuff in C# before so

I'm

wanting to use C# for the database access in the program.

I want to write a C# DLL file where I can call methods from the C++

program

so that it can get data out of the database. The C++ program is only

needing

to get a few things from the database so it's going to be simpler to just
use C# for this, and im not trying to create a wrapper for a lot of .NET
database functions or anything like that.

So how do I go about writting a C# Dll and accessing it from unmanaged

C++?

Thank You for any help,
Grant

[Grant Stanley]

The reason is that I know how to access the SQL database from .NET but I
have no idea how to do it easily in C++

If its as easy as from C# then I will certainly try. I guess I should look
into it.

Grant

"Oscar Thornell" <os***@cyberode.se> wrote in message
news:#V**************@TK2MSFTNGP10.phx.gbl...

Kevin is absolutly correct that you need a COM callable wrapper to use ..NET code from the unmanged world...

I am just wondering why you can´t use C++ to access the database in the
first place? Somehow it seems kind of wrong to access the db through .NET if you still are going to need C++ for the most part and only needs a few parts from a db??

Anyway good luck!
/Oscar
"Grant Stanley" <ag**@kent.ac.uk.delete> wrote in message
news:40*********************@lovejoy.zen.co.uk...

Im writting a program in unmanaged C++, and want to access a MS SQL
Database. I've done quite a lot of database access stuff in C# before so

I'm

wanting to use C# for the database access in the program.

I want to write a C# DLL file where I can call methods from the C++

program

so that it can get data out of the database. The C++ program is only

needing

to get a few things from the database so it's going to be simpler to just use C# for this, and im not trying to create a wrapper for a lot of .NET
database functions or anything like that.

So how do I go about writting a C# Dll and accessing it from unmanaged

C++?

Thank You for any help,
Grant