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I know only one way how to solve your problem here. You have a choise to create an out-of-process COM object and make just a single instance of it in the memory. That means by any calling of CoCreateInstance(..) you connect just to that single instance of your COM object.
For creation of a single instance in Visual C++ ATL you can use a macro:
DECLARE_CLASSFACTORY_SINGLETON( CMyCass )
Jawid
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Your in-proc object must register yourself in ROT by RegisterActiveObject(). Then any client can retrieve it by GetActiveObject() and subscribe to events.
With best wishes,
Vita
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i have created two com classes in ATL A and B.The class B
also fires event . if i declare an object of class B in
visual basic using WithEvents keyword and then create its
object using NEW keyword,evenrything runs fine and i can receive events in vb client.
But the problem is ,i dont want to create the Class B object in Visual basic ,instead i have method in CLass A
which creates the object and returns the interface to
vb client,now when Object B fires event the com server crashes.
can anybody help me how to solve this problem.
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There is no real problem.
Dim WithEvents bb As B
...
Set bb = New B
or
Set bb = a.CreateBObject
are equal to receive the B events.
With best wishes,
Vita
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I am craeted a ComAddin for Excel using MFC;And I created a ExcelAddin(Save work book as a addin).
in the ComAddin I wont to access ExcelAddin's sheet.
How to access objects of ExcelAddin?
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Hi, all
Some problems about ATL Com:
1.I have create two ATL Object: CStudent and CTeacher .
The simple source code listed as follow: (some code auto generated by ATL have been skiped)
class CStudent
{
private:
long m_age;
public:
CStudent():m_age(10)
{
}
//...other code auto generated by ATL
};
class CTeacher
{
private:
IStudent* m_aStudent;
public:
CTeacher()
{
//create an instance of the com
CoCreateInstance(CLSID_Student,NULL,CLSCTX_ALL,IID_IStudent, (void**)&m_aStudent);
}
//...other code auto generated by ATL
}
2.Then I add a "IStudent * OneStudent" property for ITeacher ,to access the m_aStudent.
The implemention of the property are listed as below:
STDMETHODIMP CTeacher::get_OneStudent(IStudent *pVal)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())
// TODO: Add your implementation code here
*pVal = * m_aStudent;
return S_OK;
}
STDMETHODIMP CTeacher::put_OneStudent(IStudent *newVal)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())
// TODO: Add your implementation code here
*m_aStudent = *newVal ;
return S_OK;
}
3.Now I type some VB code to test the com ,but some compiler errors occurrs.
VB Code:
Dim s As Student
Dim t As New Teacher
s = t.OneStudent
the last sentence "s = t.OneStudent" have compiler errors.
Errors:function or interface marked as restricted ,or the function use an Automation type not supported in Visual Basic
I guess the errors caused by the type dismatch between IStudnet and CStudent.But I did not know how to resolve it .
So who can tell me how to return the m_aStudent that can be supproted in vb??
thx.
Regards.
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STDMETHODIMP CTeacher::get_OneStudent(IStudent* *pVal)<br />
{<br />
AFX_MANAGE_STATE(AfxGetStaticModuleState())<br />
*pVal = m_aStudent;<br />
if( m_aStudent != NULL )<br />
m_aStudent->AddRef();<br />
return S_OK;<br />
}<br />
<br />
STDMETHODIMP CTeacher::put_OneStudent(IStudent *newVal)<br />
{<br />
AFX_MANAGE_STATE(AfxGetStaticModuleState())<br />
if( m_aStudent != NULL )<br />
m_aStudent->Release();<br />
m_aStudent = newVal ;<br />
if( m_aStudent != NULL )<br />
m_aStudent->AddRef();<br />
return S_OK;<br />
}<br />
In VB you should use the "Set" operator to assign one object to another.
Set s = t.OneStudent<br />
With best wishes,
Vita
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I have a COM interface and would like the CLSID for the underlying implementing object. The interface I have decends from IDispatch, and I have played with ITypeInfo. I am able to get the IID of the interface, but not the CLSID of the object. Is there an easy way to do this?
Thanks,
cagey
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In order to get CLSID of running COM instance that object must have at least IPersist to be implemented.
--or--
To read CLSID from TypeLib (If you TypeLib has more then one coclass and some of those coclasses have implemented the same interface you can not say which coclass is instantiated):
#include <stdio.h>
#include <windows.h>
#include "comdef.h"
#include "atlbase.h"
void main()
{
CoInitialize(0);
{
CComPtr<IDispatch> p;
HRESULT hr;
hr = p.CoCreateInstance(L"TestObj.Test");
if(S_OK == hr)
{
::ITypeInfo *pti;
::ITypeLib *ptl;
UINT ui;
hr = p->GetTypeInfo(0, LOCALE_SYSTEM_DEFAULT,&pti);
if(S_OK == hr)
{
hr = pti->GetContainingTypeLib( &ptl, &ui);
pti->Release();
if(S_OK == hr)
{
ui = ptl->GetTypeInfoCount();
for(UINT i = 0; i < ui; ++i)
{
hr = ptl->GetTypeInfo(i, &pti);
if(S_OK == hr)
{
::TYPEATTR *patr = 0;
hr = pti->GetTypeAttr( &patr);
if(patr->typekind == TKIND_COCLASS)
{
printf("OK - TKIND_COCLASS\n");
OLECHAR *wsz;
hr = ::StringFromCLSID(patr->guid, &wsz);
if(S_OK == hr)
{
printf("CLSID = %s\n",(char*) _bstr_t(wsz));
::CoTaskMemFree(wsz);
}
}
pti->Release();
}
}
ptl->Release();
}
}
}
}
CoUninitialize();
}
soptest
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soptest's code should be working in most cases, but first check if the object supports IPersist, IProvideClassInfo or IProvideClassInfo2. You can then obtain the class ID in a very simple way through:
IPersist::GetClassID()
IProvideClassInfo2::GetGUID()
gertjan
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I have written a C++ application that uses the COM+ event system. It consists of a publisher that creates log strings and
a subscriber client that creates a transient event subscription to get notifications every time a log string is sent. Everything
works fine when I run the publisher and subscriber on the same host, but if I try to subscribe from another host it fails.
The setup code looks like this:
BOOL RegisterTransientSubscription(LPCOLESTR SubscriptionName,
LPCOLESTR pszEventID,
IUnknown *pUnknown,
LPOLESTR* ppszSubscriptionID)
{
ICOMAdminCatalog* pac;
HRESULT hr = E_FAIL;
// Get an ICOMAdminCatalog interface pointer.
hr = ::CoCreateInstance (CLSID_COMAdminCatalog, NULL,
CLSCTX_SERVER,
IID_ICOMAdminCatalog,
(void**) &pac);
if (SUCCEEDED (hr))
{
ICatalogCollection* pcc = NULL;
BSTR bstr = ::SysAllocString(OLESTR \
("TransientSubscriptions"));
// host name edit empty <=> local publisher,
// otherwise remote host...
if (m_sHostName.IsEmpty())
{
// Get an ICatalogCollection pointer for the
// TransientSubscriptions collection (local).
hr = pac->GetCollection(bstr, (IDispatch**)&pcc);
::SysFreeString (bstr);
} else {
ICatalogCollection* tmp;
hr = pac->Connect(m_sHostName.AllocSysString(),
(IDispatch**)&tmp);
if (SUCCEEDED(hr))
{
VARIANT v;
VariantInit(&v);
hr = tmp->get_Name(&v);
hr = tmp->GetCollection(bstr, v,
(IDispatch**)&pcc);
tmp->Release();
}
}
if (SUCCEEDED (hr))
{
// Add an item to the TransientSubscriptions
// collection.
ICatalogObject* pco;
hr = pcc->Add((IDispatch**) &pco);
if (SUCCEEDED (hr))
{
// Register a transient subscription.
hr = SetStringProperty(pco, OLESTR("Name"),
pszSubscriptionName);
hr = SetStringProperty(pco,
OLESTR("EventCLSID"),
pszEventID);
hr = SetBoolProperty(pco, OLESTR("Enabled"),
TRUE);
hr = SetIUnknownProperty(pco, OLESTR\
("SubscriberInterface"),
pUnknown);
// Copy the subscription ID to the address
// specified by the caller.
VARIANT var;
::VariantInit (&var);
bstr = ::SysAllocString (OLESTR ("ID"));
pco->get_Value (bstr, &var);
::SysFreeString (bstr);
int nSize = (::SysStringLen(var.bstrVal) + 1) *
sizeof (OLECHAR);
BYTE* pBuffer = new BYTE[nSize];
::CopyMemory (pBuffer, var.bstrVal, nSize);
*ppszSubscriptionID = (LPOLESTR) pBuffer;
::VariantClear (&var);
pco->Release();
}
// Write the changes to the catalog.
long lResult;
hr = pcc->SaveChanges(&lResult);
pcc->Release();
}
pac->Release();
}
return (SUCCEEDED(hr)) ? TRUE : FALSE;
}
Any help would be much appreciated (2 weeks of debugging/testing/experimenting and I still don´t know what's wrong).
Regards,
Stefan
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Hi everybody,
I've implemented QueryStatus of the IOleCommandTarget interface. It looks like this:
interface IOleCommandTarget : IUnknown
{
[helpstring("method Exec")]
HRESULT Exec(
[in] const GUID *pguidCmdGroup,
[in] DWORD nCmdID, [in] DWORD nCmdExecOpt,
[in] VARIANTARG *pvaIn,
[in,out] VARIANTARG *pvaOut);
[helpstring("method QueryStatus")]
HRESULT QueryStatus(
[in] const GUID *pguidCmdGroup,
[in] ULONG cCmds,
[in,out] OLECMD *prgCmds,
[in,out] OLECMDTEXT *pCmdText);
};
But, when I try to compile the idl file I receive this error;
Creating Type Library...
Microsoft (R) MIDL Compiler Version 5.01.0164
Copyright (c) Microsoft Corp 1991-1997. All rights reserved.
Processing E:\development\COM experiments\ProxyObj\ProxyObj.idl
ProxyObj.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\oaidl.idl
oaidl.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\objidl.idl
objidl.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\unknwn.idl
unknwn.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\wtypes.idl
wtypes.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\ocidl.idl
ocidl.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\oleidl.idl
oleidl.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\servprov.idl
servprov.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\urlmon.idl
urlmon.idl
Processing D:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\msxml.idl
msxml.idl
E:\development\COM experiments\ProxyObj\ProxyObj.idl(59) : error MIDL2025 : syntax error : expecting a type specification near "OLECMD"
E:\development\COM experiments\ProxyObj\ProxyObj.idl(59) : error MIDL2026 : cannot recover from earlier syntax errors; aborting compilation
Error executing midl.exe.
ProxyObj.tlb - 2 error(s), 0 warning(s)
Any idea why? Should I include something special?
Thx,
/Tommy
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In IDL file:
import "oaidl.idl";
import "ocidl.idl";
import "docobj.idl";
With best wishes,
Vita
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I have a C++ DLL that I created with a whole bunch of typedefs for structs and enums (as well as some exportable functions and classes). The DLL's work fine when being called by a C++ project. However, we would like to add support for Visual Basic so that it can use the user defined types and enums. I looked through MSDN and found an article that states if you want to pass UDT's from VB to a C++ DLL, you have to create a type library. Having never used COM before (let alone typelibs), how do I go about defining these items to export? I wold prefer to not have to rewrite the code to create a COM interface.
Any help would be greatly appreciated.
Brigg Thorp
Software Engineer
Timex Corporation
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import "oaidl.idl";
import "ocidl.idl";
[
uuid(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX), // GUID of your Type Library. Use GUIDGEN.EXE from MS Common\Tools
version(n.m), // Version of your Type Library, e.g. 1.0
helpstring("XXXXXXXX") // Description of your Type Library
]
library XXXXLib
{
importlib("stdole32.tlb");
importlib("stdole2.tlb");
typedef [
uuid(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX),
version(n.m),
helpstring("XXXXXXXX")
]
enum tagXXXX
{
[helpstring("XXXXXXXX")]
XXXX = YYYY,
} XXXX;
typedef [
uuid(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX),
version(n.m),
helpstring("XXXXXXXX")
]
struct tagXXXX
{
} XXXX;
};
It's a template. Rename the XXXX placeholder with your Names and Values.
You can include this IDL-file into your project and create the TLB file. This TLB file can included into DLL (or EXE) as the resource, named "TYPELIB".
This TLB file (both alone or included into other module) must be registered with REGTLIB.EXE or VB itself if you will add this TLB into project's References (Browse button).
With best wishes,
Vita
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Getting value from stuff you don't own is a compelling
idea. Just think, someone else has created something
that has value, and has made it available to you. You
can now leverage its value in ways that makes all
parties richer. That's the promise of web services.
You need to know about web services. The advent of
standards-based web services marks a new era of
system development. First mainframe, then client-server,
the Web, now web services makes it possible to leverage
every legacy system of the past and do so much more
with your information assets.
Architag Press, a division of Architag International
Corporation, announces the publication of Web Services
Implementation Guide, Volume 1: Getting Started, by
Brian E. Travis and Mae Ozkan.
Sample chapters of the book is available at
http://www.architag.com/press/wsig.
This book will show you what a web service is, and
how you can align your internal systems and external
trading partner interactions to take advantage of this
new concept in system integration.
You will learn about the "Three Steps to Web Services":
* Automate internal systems
* Determine integration points
* Expose integration points as web services
This book is for systems architects, developers,
and I.T. decision makers.
Highlights in this book:
* Written in a light, entertaining style.
* Emphasis on architectural design for web services.
* A tutorial on the state of web services standards.
* Plenty of real-life examples of web service use.
* Tutorials on the key technologies: XML, SOAP,
WSDL and UDDI.
* Code samples of key XML-based web services
technologies and extensions.
* Companion Web site with all code samples and
late-breaking information.
----
Download sample chapters of Web Services Implementation
Guide at http://www.architag.com/press/wsig/.
Stanford Powers, Publisher Architag International Corp
Phone: 866-898-0001 Outside US: +1-303-426-3126
Email: spowers@architag.com Fax: 720-294-1396
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Hi,
I've been staring at this problem for hours and hours... what is wrong?!
This is what I do:
...snip...
CComModule _Module;
BEGIN_OBJECT_MAP(ObjectMap)
OBJECT_ENTRY(CLSID_Lex, CLex)
END_OBJECT_MAP()
extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID )
{
if (dwReason == DLL_PROCESS_ATTACH)
{
TCHAR pszLoader[MAX_PATH];
GetModuleFileName(NULL, pszLoader, MAX_PATH);
_tcslwr(pszLoader);
if (_tcsstr(pszLoader, _T("explorer.exe")))
return FALSE;
_Module.Init(ObjectMap, hInstance, &LIBID_LEXBHOLib);
DisableThreadLibraryCalls(hInstance);
}
else if (dwReason == DLL_PROCESS_DETACH)
_Module.Term();
return TRUE;
}
...snap...
I get this error:
---Configuration: LexBHO - Win32 Unicode Release MinDependency--------
Linking...
Creating library ReleaseUMinDependency/LexBHO.lib and object ReleaseUMinDependency/LexBHO.exp
LIBCMT.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
ReleaseUMinDependency/LexBHO.dll : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
LexBHO.dll - 2 error(s), 0 warning(s)
But when I comment these lines out...
...things are working just fine. What is wrong with _tcslwr? Because that's where the problems start...
Help is much appreciated,
/Tommy
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go ot project setting and remove _ATL_MIN_CRT macro
soptest
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Hello everyone...
I'm very much new to the COM world and I was wondering if some guru here could lead me to websites/ articles that can get me really started in COM and ATL.. I have been working with MFC for the last one year and I am already pretty realise the need for ATL and more robust prog tech..
anyway, that apart I'm also looking for a few project ideas in ATL.. this is ofcourse to add to my personal project list..
thks
yeeeeeeeeeeoooooooooooooowwwwwwwwwwwwwww
One more addition to the addiction of coding!
If you want a helping hand, you'll find one at the end of your arm.
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before invoking the IDispacth::invoke I do the following:
BOOL CLASSNAME ::InvokeGetValue(
IDispatch *InDispatch,
DISPID& InDispId,
LCID& InLcid,
long InUserComId,
CString& OutValue, BOOL bAdhocCom, int NumToReserve, CString& Name1, CString& Name2)
{
CString strReturn;
VARIANTARG va;
EXCEPINFO exInfo;
UINT uErr;
DISPPARAMS dp;
HRESULT hr;
BSTR argConversion;
BSTR sName1= Name1.AllocSysString();
BSTR sName2= Name2.AllocSysString();
Num=32;
int nArgs = 3;
dp.cArgs = nArgs;
dp.cNamedArgs = 0;
//////???AT RUN TIME IT CRASHES ON THE NEXT INSTRUCTION
///// COMPLAINIG ABOUT UNHANDLED EXCEPTION- ACCESS VIOLATION
dp.rgvarg[0].vt = VT_I2;
dp.rgvarg[0].iVal = NumToReserve;
ANY HELP IS HIGHLY APPRECIATED.
Paradise is where I am.
Voltaire
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did you initialize :
VariantInit(va);//your variant and
dp.rgvarg = va;//your dispparam with you variant?
access violation is often null pointer...!
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The problem was solved by a codeguru member:
CComVariant dpv[3];
dp.rgvarg = dpv;
I was not allocating space for the dp array structure.
Thank you very much for you reply. I believe your
dp.rgvarg = va;//your dispparam with you variant?
statement was in the same general direction too.
Thanks again.
Paradise is where I am.
Voltaire
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I'm working on a c# application and i'd like to get it launchable from Microsoft Word using a new icon. The problem is I don't know how to do, I've been searching throw articles but they often explain how to launch and control Word from an application and not the contrary.
Could someone explain me how to do such a thing, or at least give me a few steps ?
Thank you.
---------
Or not ?
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try http://www.codeproject.com/com/outlookaddin.asp for a C++/COM article on how to write a plugin for any office application. For sample C# project, checkout MSDN for an article that got published a couple of months back.To launch your own application, you can use ShellExec in OnClick of a toolbar button in your plugin.
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