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Reusing COM objects
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Mazy
"The path you tread is narrow and the drop is shear and very high,
The ravens all are watching from a vantage point near by,
Apprehension creeping like a choo-train uo your spine,
Will the tightrope reach the end;will the final cuplet rhyme?"Cymbaline-Pink Floyd
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Can you tell me something in detail. I want to access from one object to other objects.
What mechanism it is and What API i need?
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I suggest you Containment that is easier.Do you know how to use your COM object in client application?Thats exactly the same.Use CreateInstance() in your second component to iniatilize the first component.If you have any problem to use it just ask. 
Mazy
"The path you tread is narrow and the drop is shear and very high,
The ravens all are watching from a vantage point near by,
Apprehension creeping like a choo-train uo your spine,
Will the tightrope reach the end;will the final cuplet rhyme?"Cymbaline-Pink Floyd
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Mazdak, Thank you very much. I'll try on it.
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Hi,
I'm having a problem in COM EXE.
I create a new worker thread that loops and listens to messages. during shut down I release pointers defined in its scope, and call CoUninitialize.
but it seems to get stuck there. (The function who stops the thread waits until the worker thread is signaled, that happens only after couninitialize, which is the last line in the worker thread)
is there any deadlock associated with it? or I have not released everything? I checked and it seems i have released all.
can you supply me with directions for thought what is wrong there?
Thanks.
Sefi p.
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Hi all,
in the code below, hToken is an impersonation token which I
duplicate into a primary token in order to use with
CreateProcessAsUser. I ask the new token to have the
DELEGATION level of impersonation but I get error 1346 :
ERROR_BAD_IMPERSONATION_LEVEL. NTLM is running on W2K as
the SSP provider, but it seem that delegation is not supported. Is it possible to have the impersonation level with CLOAKING enabled with NTLM ? does this provide a
one hop machine-cross delegation level (which is sufficient for my server) ? All this is done with a calling from an ASP page, how can i set the impersonation level for the client ?. All this confuse me, thank to bring some light ...;)
if ( !DuplicateTokenEx(
hToken, // handle to token to duplicate
TOKEN_ALL_ACCESS | TOKEN_QUERY |
TOKEN_ASSIGN_PRIMARY | TOKEN_DUPLICATE,
NULL,
SecurityDelegation,
TokenPrimary,
&hDup ) ) {
err = GetLastError();}
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Sorry for the duplicate post but the first one stripped off the template args. Look near the bottom of the code snippet. I'm not sure what the code is doing, can someone explain.
template<typename _IIID> class _com_ptr_t {
public:
typedef _IIID ThisIIID;
typedef typename _IIID::Interface Interface;
static const IID& GetIID() throw()
{
return ThisIIID::GetIID();
}
template<typename _OtherIID> _com_ptr_t(const _com_ptr_t<_OtherIID>& p) throw(_com_error)
: m_pInterface(NULL)
{
HRESULT hr = _QueryInterface(p);
if (FAILED(hr) && (hr != E_NOINTERFACE)) {
_com_issue_error(hr);
}
}
template<typename _InterfaceType> _com_ptr_t(_InterfaceType* p) throw(_com_error)
: m_pInterface(NULL)
{
HRESULT hr = _QueryInterface(p);
if (FAILED(hr) && (hr != E_NOINTERFACE)) {
_com_issue_error(hr);
}
}
template<> _com_ptr_t(LPSTR str) throw(_com_error)
{
new(this) _com_ptr_t(static_cast<LPCSTR> (str), NULL);
}
...
}
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Gerald Schwab wrote:
template<> _com_ptr_t(LPSTR str) throw(_com_error)
{
new(this) _com_ptr_t(static_cast<LPCSTR>(str), NULL);
}
That is calling one constructor from another. Since the constructor that takes an LPCSTR is marked explicit, a different constructor was needed that takes an LPSTR. (explicit means that the constructor parameter must exactly match LPCSTR, no implicit conversions (such as adding a const qualification to convert an LPSTR to an LPCSTR) are allowed.)
This totally negates the purpose of having the explicit constructor, but oh well.
The new(this) calls an operator new defined in new.h, which is #include'd at the top of comip.h.
--Mike--
"Jobs that don't allow you to visit the Lounge 25 times a day at the minimum are not worth having anyway."
-- Nish, 3/28/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan and Jamie Salé.
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Thanks for the reply Michael. I understand the "explicit" part, but I'm still a little fuzzy on the "new" part. I stepped through the code with the debugger and it looks like this constuctor is instantiating itself using the explicit constructor. Here's what I don't quit get: when "new(this)" is called, "this" already has an address. So is this constructor calling the explicit constructor and replacing itself with the constructed value of the explicit contructor? Or is it casting from this constructor to the explicit constructor? I understand the result, I just don't quite grasp how the code gets there.
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The purpose of new() is usually to allocate memory and return a pointer to it, however you can overload new() to do anything. That's what that constructor does, it calls an overloaded new() that just returns the parameter passed to it. Since there is already memory allocated for this, new() returns that address, then C++ calls the constructor.
It is bloody confusing, though. 
--Mike--
"Jobs that don't allow you to visit the Lounge 25 times a day at the minimum are not worth having anyway."
-- Nish, 3/28/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan and Jamie Salé.
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Mike,
I see you continue to include a link to your "really out-of-date homepage" when are you going to update it?
Nick Parker
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Look near the bottom of the code snippet. I'm not sure what the code is doing, can someone explain.
template<typename _IIID> class _com_ptr_t {
public:
typedef _IIID ThisIIID;
typedef typename _IIID::Interface Interface;
static const IID& GetIID() throw()
{
return ThisIIID::GetIID();
}
template<typename _OtherIID> _com_ptr_t(const _com_ptr_t<_OtherIID>& p) throw(_com_error)
: m_pInterface(NULL)
{
HRESULT hr = _QueryInterface(p);
if (FAILED(hr) && (hr != E_NOINTERFACE)) {
_com_issue_error(hr);
}
}
template<typename _InterfaceType> _com_ptr_t(_InterfaceType* p) throw(_com_error)
: m_pInterface(NULL)
{
HRESULT hr = _QueryInterface(p);
if (FAILED(hr) && (hr != E_NOINTERFACE)) {
_com_issue_error(hr);
}
}
template<> _com_ptr_t(LPSTR str) throw(_com_error)
{
new(this) _com_ptr_t(static_cast<LPCSTR> (str), NULL); <<<<<<-- WHAT IS THIS LINE DOING?
}
...
}
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open a new com. port but disable the interface.
---->NULL
czer
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I was wondering if it is possible to use STL vectors with CComBSTR?
example:
vector<ccombstr *=""> vComBSTR;
Now how does one allocate new CComBSTR objects into the vector? I'm quessing like so,
vComBSTR.push_back(new CComBSTR("Hello"));
Or do I need to use the SysAllocString instead?
What is a programmer to do.
Thanks in advance.
Ken
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Madmaximus wrote:
I was wondering if it is possible to use STL vectors with CComBSTR?
std::vector<CAdapt<CComBSTR> >
CAdapt is an ATL class that lets you use CComBSTR and CComPTR/CComQIPtr in STL collections. See CAdapt in MSDN for more.
--Mike--
"Jobs that don't allow you to visit the Lounge 25 times a day at the minimum are not worth having anyway."
-- Nish, 3/28/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan and Jamie Salé.
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Thanks for the fast reply.
How does one declare a CComBSTR pointer in a vactor?
Example:
std::vector<cadapt<ccombstr *=""> >
Does one just uses the new operator? Or do I need to use the SysAllocString function.
Examples:
std::vector<cadapt<ccombstr *=""> > vComBSTR;
vComBSTR.push_back( new CComBSTR("Hello"));
OR
vComBSTR.push_back( SysAllocString("Hello"));
Thanks in advance.
Ken
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I'm trying to build a library similar to the common dialog controls library. It works, mostly. I have a class CHostWindow:
class ATL_NO_VTABLE CHostWindow :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CHostWindow, &CLSID_HostWindow>,
public IDispatchImpl<IHostWindow, &IID_IHostWindow, &LIBID_BTS_DLGHELPERLib>,
public CWindowImpl<CHostWindow>
In my Win32 application, I invoke HostWindow, pass to it an interface to the control I want to host, and the window works as you'd expect.
if (SUCCEEDED(Result = iHost.CreateInstance(CLSID_HostWindow)))
{
iHost->Host((PDWORD)&CLSID_DlgFieldProperties, (IUnknown**)&iFieldProps);
iHost->Show(SW_SHOW);
}
This is fine when the control contains basic window elements like pushbuttons and edit boxes but when the composite control contains another control (like the list control in the Resource Editor), the app crashes with an access violation, and according to the stack trace the program is recursively running through the composite control's property list until it runs out of stack space.
I've spent too much time trying to figure this out and now need help! I'm using CAxWindow (memory leak and all) to do the hosting. Can someone explain to me what I might be missing, or point me to some relevant, working, code?
Thanks
Matt
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I'm a student and I'm doing my project:
Build a Certification Authority
Can you give me some informations, links, tutorials, email, which related to this problem ?
Thanks!
Hung Son
A Vietnamese student
i-g.hypermart.net
dlhson2001@yahoo.com
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Windows.NET server has a CA module. I assume there is a similar thing in Win2K server. Try the Microsoft website. Remember that your Root certificate will not be recognised on other peoples PCs if you havent registered it with microsoft or the other CA list providers.
I'm not late, I'm just not as early as I could have been.
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Sorry, but I'm not sure that I understand your idea clearly. Can you tell me some more about your idea.
Thanks
Hung Son
A Vietnamese student
i-g.hypermart.net
dlhson2001@yahoo.com
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Sorry. How much do you know already about CAs, and what are to needing to do with them?
I'm not late, I'm just not as early as I could have been.
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I use msflexgrid in a excel like program to display the app data, but when the data is huge, i mean about 400 items. the additem method will take about 30s to complete. what's wrong? I use vc60 and there is no other way then add each item a time. what can i do? thanks for help
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Why doesnt ClassWizard allow u to override the defaults for non-client area messages?
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Thanks in advanced!;P 
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