CSharp with COM components in 64bit

[Yoavo]

Hi,
I have a c# application which uses COM DLLs which were build in 32bit
environment.
When I tried to run my program in 64 bit computer, the program crashed when
trying to create a COM class.

can someone please help ?

Yoav.

 

[Mark Rae]

the program crashed

More information please...

 

[Willy Denoyette [MVP]]

Hi,
I have a c# application which uses COM DLLs which were build in 32bit environment.
When I tried to run my program in 64 bit computer, the program crashed when trying to
create a COM class.

can someone please help ?

Yoav.

You can't mix 64 bit and 32 bit code in user applications, so you'll have to compile your
application as 32 bit, to do this:
set the platform to x86 in your project properties or add /platform:x86 as command line
switch.
Willy.

 

[Laura T.]

Unless you can convert the existing component to out-of-process COM server
(what we are doing for short term migration). In that case the 32-bit/64-bit
interoperability works. It is even quite fast.

 

[Laura T.]

Check this: http://msdn2.microsoft.com/en-us/library/ms973190.aspx

 

[Willy Denoyette [MVP]]

Unless you can convert the existing component to out-of-process COM server (what we are
doing for short term migration). In that case the 32-bit/64-bit interoperability works. It
is even quite fast.

Even if you can convert, you'll have to keep in mind that It's 100 times slower to marshal
cross-process than calling in process same thread.
Also, if you don't need the extended addressing capabilities of 64 it's actually better to
compile for X86 anyway.

Willy.