CoInitializeEx

[Alan Hoyt]

Hi,

I'm using Win NT 4.0 with VC++ 6.0.
I'm having problems getting a program to compile that has a call to
CoInitializeEx(NULL, COINIT_MULTITHREADED );

I need this call in my thread procedure to make all my threads belong to the
same apartment, so I don't have to marshal interface pointers across
apartment boundaries. I've included the header file objbase.h that is
listed in the MSDN docs for the function, but I still get the following
compile errors:

C:\work\ADOThreadTest\readThread.cpp(58) : error C2065: 'CoInitializeEx' :
undeclared identifier

C:\work\ADOThreadTest\readThread.cpp(58) : error C2065:
'COINIT_MULTITHREADED' : undeclared identifier

If I replace CoInitializeEx with CoInitialize the program will compile with
no problems. Are there any other headers that I have to include, or
compiler defines that I have to declare to make this compile? Is there
another way to make all my threads belong to the same apartment besides
using CoInitializeEx?

Thanks,

Alan

[Peter Partch]

Define _WIN32_DCOM (in your project settings pre-processor defines).

The API's specific to DCOM release of the OS are surrounded by conditional
compilation statements that require you to #define to access there
definitions...

Peter Partch

Alan Hoyt <al...@delorme.com> wrote in message
news:uAoOz4fB$GA.278@cppssbbsa04...

[none]

Thanks Peter, that did the trick.

[Stefan Cuypers]

Alan,

Since CoInitializeEx is a new function in NT 4, it is protected by
conditional compilation.
You need to tell the header files you're targeting NT 4 or later.
If you're using an stdafx.h file, put the following lines on it before
including any of the system headers (this is what the ATL wizzard does) :
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0400
#endif

If you don't have an stdafx.h file, you can put the define in your project
settings.

regards,
Stefan Cuypers