Hi Suresh,
1. COM client - this is quite simple, the only you need is to call
CoInitialize or CoInitializeEx at the beginning of your program, and
then call CoUninitialize at the end. The most important thing you need
is a C(++) interface definition of the COM objects you want to use. Many
of them are already in the MinGW header files, such as IMalloc or ADO
objects (adoint.h). In this case, you only need to include the
appropriate header file and call CoCreateInstance to create the object
you want and finally cast it to the appropriate type.
Bigger problem appears if you want to use objects which are not
considered to be part of the OS, such as Adobe Acrobat Reader control.
In this case you need to get the interface definition out of the Type
Library. I am not aware of any OSS tool which could read type libraries
and create C++ wrappers for the objects described there. Perhaps the
easiest solution is to create new C++ project in Visual Studio, does not
need to be ATL enabled, reference the TLB you want in the project. VS
will generate two files with extensions .tli and .tlh. You can use the
tlh file to create header file with the type definitions you want to
use.
2. COM server - this is a bit more complicated, since you must implement
several interfaces such as IClassFactory and also interfaces of your
objects. If you only implement some existing interface with existing
type library, you can directly link this TLB file into resource of your
project. You will need the types described in TLB to implement IDispatch
interface for your objects. You will do this through CreateStdDispatch
API. You could avoid this by implementing of all the IDispatch methods
yourself, but this is not recommended and will require lots of work.
If you want to design your own interface, you will also face the problem
of generating type library for your interfaces. I could not find
anything else than using MIDL compiler delivered with Visual Studio for
this task.
-
I don't have any COM client example at the moment I could share,
although I wrote many in my life. But I can share COM server - it is an
implementation of OLE DB provider for PostgreSQL database. You can
compile the project both as 32 and 64 bit version. The source code is
available here: http://sourceforge.net/projects/pmpostgresqlole/ (zipped
in the Files section).
Pavel
On Sat, 2014-11-22 at 19:20 -0800, Suresh Govindachar wrote:
Hello,
Please point me to a simple but complete, 64 bit, C++, non-gui example
of a COM server and client. I know nothing about COM but hope to have
access to the book Essential COM by Don Box within a week or so. Via
google, I found this thread from six years ago (Sep 2008) COM and ATL
supporT in minGW
http://mingw.5.n7.nabble.com/COM-and-ATL-supporT-in-minGW-td15733.html .
Thanks,
--Suresh
--
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk
___
Mingw-w64-public mailing list
Mingw-w64-public@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
--
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk
___
Mingw-w64-public mailing list
Mingw-w64-public@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
