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A server knows the client is present or not by using reference counting. But how knows the server when a client crashes. In that case the client is not able to call Release.
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Does anyone how to import "tlbinf32.dll" ? When i tried like following:
#import "tlbinf32.dll" no_namespace named_guids
I got a bunch of compiler error.
Andy
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import "tlbinf32.dll" exclude("ParamFlags", "IDLFlags", "ImplTypeFlags","_DirectCalls")
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I am trying to write a DCOM server application. Some of the interface functions have paramaters that are user defined data types (structs). I have the header files where these type definitions are included in the server .h file included in the .h file of the server .cpp file. When I try to build, I receive the following error that points back to the .idl file:
"Expecting type specification near "data_type".
Any advice on how to remedy this. I am fairly new to DCOM/COM programming.
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Hi,
(1) Your interfaces which uses structs or other defined types must me custom defined.
(2) The only place where you must define your structs is the .idl file (see below).
(3) Don't forget to compile your <yourserver>PS.mk (Visual Studio generatied make file)
(4) Use CoTaskMemAlloc() and CoTaskMemFree() to transfer the struct data (example shows an array of structs)
Success Aat
EXAMPLE
// YourServer.idl : IDL source for YourServer.dll
//
// This file will be processed by the MIDL tool to
// produce the type library (YourServer.tlb) and marshalling code.
import "oaidl.idl";
import "ocidl.idl";
typedef struct
{
int iType;
int iValue;
// E.t.c.
} YOURSTRUCT;
// ....
[
object,
uuid(BECF60B9-2741-11D4-A05E-00B0D0201DD6),
helpstring("IYourObject Interface"),
pointer_default(unique)
]
interface IYourObject : IUnknown
{
[helpstring("method Read")] HRESULT Read([out,size_is(,*plNumStructs)] YOURSTRUCT** ppYourStructs, [in, out] long* plNumStructs);
[helpstring("method Write")] HRESULT Write([in,size_is(lNumStructs)] YOURSTRUCT* pYourStructs, [in] long lNumStructs);
};
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Hi,
what is UI element in controlpanel / display properties.
there four tabs back ground, screen saver etc. what is that
UI element?
Thanks,
Koteswara
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HELP !
I am VERY new to COM (3 days experience) and I want to do something which may sound a bit odd.
I wish to take a pointer to a C++ object from one application and pass it via COM to another C++ application.
The only stuff I have found on doing this involves serializing the objet to a CMemFile and passing it as a string.
The Object I wish to pass is a container and I do not wish to make everything it holds serializable, problem.
If anybody can help me it would be nice.
Thanks
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You can try to get pointer to your object and then pass it to your COM object as LONG. That way your COM object will know the memory location of the object you are passing.
Peter
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I have tried passing the pointer to the object as long.
When I do this it does not appear (when debugging the COM)to have the same value it had in the app which created it.
Also I could not get the long value back into the second app, it had a different value.
Puzzled !
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If your com is an exe the passing a pointer as long will not work since the com is in a diferent process and therefore the address in the long is not valid. Passing pointers as long will work only if your COM is a dll.
(Don't forget to cast the pointer in both sides back to the structure it points to, before using it).
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On the other hand it would be better to create a COM wraper for the object that you are passing. And than just pass the interface pointer.
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How do I create a COM wrapper ?
Remember I am very new to COM.
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>I wish to take a pointer to a C++ object from one application and pass it via COM to another C++ application.
You cannot do this, COM or no COM. Each Win32 app has its own isolated memory space. A pointer in app A has no meaning if you pass it to app B.
You'll need to use IPC (inter-process communication) techniques to pass data between apps. There are articles here at CP on doing this - give them a read. (You are sort-of on the right track with CMemFile, but CMemFile is not a memory-mapped file, which is the IPC mechanism you're thinking of.)
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What exactly are you trying to do? What does this C++ do that separate applications need access to it? You might want to put the C++ object in a separate COM object and have it shared between processes.
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I am using one app to do an external equipment search (this takes a while) and store the objects it created (one per equipment present) in a COM server. I want many other applications on the same machine to be able to query the COM server to get pointers to the objects.
So
Equipment search app -> COM server
COM Server -> Testing App 1
COM Server -> Testing App 2
etc
I do not want to have to go through all my equipment classes and make them serializable.
Thanks
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Then I would wrap your C++ class in a COM object. You can pass an interface pointer from your server to the clients so they may access the C++/COM object.
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Then I would wrap your C++ class in a COM object. You can pass an interface pointer from your server to the clients so they may access the C++/COM object.
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Which class, the container or each of the equipment classes (many different types) ?
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Hi all
I have a project in VC++ and MMC.
I would like to know, how can i prevent from a user to exit MMC ???
Thanks.
===============
ICQ# 37571575
===============
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You cannot prevent _any_ user to exit from mmc.
The only way to try something - is to make a "User mode, limit access".
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You cannot prevent _any_ user to exit from mmc.
The only way to try something - is to make a "User mode, limit access".
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Hi,
I tried running "DcomCnfg.exe" to configure DCOM on a Windows '98 machine and I got a message saying that you have to have user-level access selected in your network control panel before you can run this utility...
Is it possible to run a DCOM server on Windows '98 without having user-level access set up in the network control panel ? (most of our clients do not have user-level access set up) Can It be done with the default share-level
access ?
Also, on another Windows '98 machine, I could not locate the Dcomcnfg.exe application. I was under the impression that this was available in all Windows '98 installations - Am I correct, or do you have to specifically select this option when doing a custom Windows '98 installation ?
TIA
Venkatesh
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Hii!
I have a little question for you that I'm looking for answer for a
long time...
Y when we are developing a COM component we're using interfaces and
hide the implementation in DLL/EXE?
Thanks
Adam
p.s
Sorry about the "not well" English - I'm from Israel
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Hii!
I have a little question for you that I'm looking for answer for a
long time...
Y when we are developing a COM component we're using interfaces and
hide the implementation in DLL/EXE?
Thanks
Adam
p.s
Sorry about the "not well" English - I'm from Israel
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