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Hello everyone.
I want to hook file operation to move, copy, delete, or rename a file.
I found ICopyHook interface, But it was only possible hooking folder operation.
Isn't there any good method?
with regards,
kona
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"the vaue of ESP was not properly saved across a function call" got this error Dialog while compiling an empty MFC client, with a ATL control added to the UI. the ATL control is empty too, no implementations at all.
help?
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Recompile the component and the client this should work, mostly it is due to incorrect parameter passing from the client.
Still Alive!!!
Thank you God.
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thank you for the suggestion but it din't work. is there a bug in VC++ with regards to importing a ATL Control into MFC client? i have no methods in the ATL control yet hence there can't paraemeter passing involved cept for those that are carried out in the background..
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The error you describe typically occurs when there is a calling convention clash between caller and callee. For instance, class member functions are typically _thiscall, while other C++ functions are __stdcall, and C functions are _cdecl.
Some routines, particularly callbacks should be __stdcall, but occasionally, you'll see something like qsort, which requires that the ordering function you give it be __cdecl.
Are you overriding the default calling convention of any of your functions?
The other alternative, of course, is that you're overwriting the stack (in a subtle way, generally). If you know the function call, you can put a breakpoint on entry, then display the call stack, and step through the function until you see the call stack get hosed...
Steve S
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apparently the problem is with the compiling computer. it works fine in other computers. i tried installing MS SDK, VC++ SP5, clearing up the registry... and nothing works.. haha.. will be installing a new copy of VC++ today.. thanks for all the help guys. BUnch of great ppl we have here!!!
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Hi all,
I want to find an utility that do something like that:
Takes TLB (or whatever) and generates C++ wrapper classes for use these COM interfaces/objects. With ATL it could looking like:
IDL:
interface ITest
{
HRESULT GetName([out,retval] BSTR *bstrName);
HRESULT DoSmth([in] BSTR str);
}
C++ (ATL) Wrapper:
class CTest : public CComPtr<ITest>
{
public:
CString getName()
{
CComBSTR bstr;
HRESULT hr = p->GetName(&bstr);
if (FAILED(hr))
throw hr;
return CString(bstr);
}
HRESULT doSmth(LPCTSTR str)
{
return p->DoSmth(CComBSTR(str));
}
}
Such wrappers allows to program COM in C++ much easier, almost like in VB, at the same time preserving all C++ power.
Does anyone knows something similar ?
Thanks in advance,
vips
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The #import directive already does this for you automatically.
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Thank you for fast reply.
I'll try to discover the #import behavoir in C++.
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you can also use MIDL <file.idl> /h file.h
to get an IDL file you can use oleview
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Hi Guys,
Can somebody tell me whether COM objects are stateless or stateful ?
AS far as i understand, State of an object is defined by the data member it contains and COM objects can have data members.
BIG_MG
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COM objects are stateful. The very notion of object in OOP is a black box with some state, which is observed and manipulated using its public operations.
An object which is not stateful, is not an object. 
--
So let's just walk from place to place, as long as we don't talk face to face.
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We've turned our application into a DCOM automation server, which works well. The problem we have is that we need this application to execute once per client, and we need the app to run as a certain user. If I log on to the server machine as this user, and have the applications identity set to 'interactive user' in dcomcnfg.exe, everything works well. If I use 'this user' however (regardless of being logged on as that user) the application launches and functions properly twice (concurrently), but no more then twice.
When I debug into the third instance, I find that it is unable to load the main frame, it actually falls over in CMDIFrameWnd::CreateClient and GetLastError returns 'invalid window handle'.
Has anyone got any idea what is happening here, or could you point me in the right direction for more information?
Dylan
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I have a com object in which there are different properties. When i get these values through it works well when property is returning long or some other integer but it crashes when property is returning bstr. Take a look at my code and guide me that what i did wrong.
VARIANT pvResult;
memset(&pvResult, 0, sizeof pvResult);
VariantInit(&pvResult);
DISPID dispID=this->pColl->getMemberID(index);
DISPPARAMS dispParamsNoArgs={NULL,NULL,0,0};
HRESULT hr=pDispatch->Invoke(dispID,IID_NULL,LOCALE_USER_DEFAULT,
DISPATCH_PROPERTYGET,&dispParamsNoArgs,
&pvResult,NULL,&nArgErr);
Thanx in advance
Inam
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u have forgotten the last line
return pvResult.bstrval;
(offcourse after making your method of the type returning bstr)
and if u already have it there in your code..then take a look at the following code, also if it doenot work then try looking into the dispatch map..have u given the correct VTs there for the return type??
//*******************************
//body of a method returning BSTR
DISPPARAMS * DispParam1 = new DISPPARAMS();
EXCEPINFO excep;
UINT nArgErr;
VARIANT *pVarRes = new VARIANT();
DispParam1->cArgs = 0; //number of arguments
DispParam1->cNamedArgs = 0;// Number of named arguments.
DispParam1->rgdispidNamedArgs = NULL; // Dispatch IDs of named arguments.
IF1BookImpl::Invoke(DISPID_F1_Text,
IID_NULL ,
::GetUserDefaultLCID(),
DISPATCH_PROPERTYGET,
DispParam1,
pVarRes ,
&excep,
&nArgErr);
delete DispParam1;
return pVarRes->bstrVal;
//*******************************
regards
safee
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Infact program crashes when it executes the function invoke and in pVarRes there is coming bstr through get property but if long or int is coming it works well.
Now i am not understanding what to do
Regards
minamkhan
Inam
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Try
VARIANT *pVarRes = new VARIANT();
V_VT(pVarRes) = VT_BSTR;
and see if that helps....
Steve S
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Hi. I was using Inside COM by Dale Rogerson book and I dont have the CD, so I kinda guess how to register the component.
But when I do "regsvr32 /s Cmpnt.dll" , the entry for "InprocServer32" is garbage.
Can someone help me out with this?
Registry.cpp:
#include <atlbase.h>
extern "C" HRESULT RegisterServer(HMODULE g_hModule,
const CLSID& CLSID_Component1,
const char* g_szFriendlyName,
const char* g_szVerIndProgID,
const char* g_szProgID)
{
CComModule cm;
return cm.RegisterClassHelper(CLSID_Component1, g_szProgID, g_szVerIndProgID, NULL, THREADFLAGS_BOTH);
}
cmpnt.def:
;
; Cmpnt1 module-definiteion file
;
LIBRARY Cmpnt.dll
DESCRIPTION '(c)1996-1997 Dale E. Rogerson'
EXPORTS
DllCanUnloadNow @1 PRIVATE
DllGetClassObject @2 PRIVATE
DllRegisterServer @3 PRIVATE
DllUnregisterServer @4 PRIVATE
DllMain @5 PRIVATE
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Please tell me whether it is possible to finalize CD using IMAPI interface.
Thanks,
Igor.
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wt actually working of queryinterface function?
sdfsdfsdfhsdfh
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QueryInterface is a discovery mechanism. Let's say you have an interface (any interface, it doesn't matter) to a COM component. You can, using a method in the interface, ask the component if it supports another interface that you know about.
For instance, you might have an IFrooble interface on an object, and you want to know if it supports automation using the 'classic IDispatch' method.
You say something like:
HRESULT hr;
IDispatch* pDisp = NULL;
hr = pFrooble->QueryInterface( IID_IDispatch, reinterpret_cast<void**>(&pDisp));
if (SUCCEEDED(hr))
{
// Yep, it does dispatch, and we now have that interface as well
// as the IFrooble one.
}
else
{
// No, it doesn't or can't provide that interface
}
Does that help?
Another scenario is versioned interfaces, where a client will ask for successive interfaces (eg IFooBar4, IFooBar3, IFooBar2, IFooBar) until it gets one it's happy with.
Steve S
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If you look from the C++ point of view,
All you interfaces to COM object are abstract base classes with pure virtual functions. And your COM object gives implementation of all these functions.
So when you call QueryInterface, it simple casts the COM object(this) into the interface pointer, increase a reference count and return that pointer. This way you can only call the functions declared in that interface.
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Wt diffrence between simple dll and COM dll?
sdfsdfsdfhsdfh
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[fx: deep breath]
a COM dll will provide code for registration/deregistration, as well as a mechanism to create lifetime-managed components. In general, it provides a published binary interface (which should be immutable) to allow use of the component(s) in languages other than the one it was written in.
It follows a standard mechanism for requesting component creation, and includes mechanisms for lifetime management (IUnknown::AddRef, IUnknown::Release) as well as a mechanism for capability discovery (IUnknown::QueryInterface) which is extensible.
(Guys, did I miss anything?)
Steve S
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DrCOM Monitor
http://www.ddevel.com/DrCOM/DrCOMMonitor.asp
I'm trying to externally control a target app that is built on COM.
I have read
http://www.codeproject.com/com/automatingwindowsapps.asp
However, this technique looks way too comlicated in my case to realize what I'd like to do, and in fact, looking at the DrCOM folder at least, it seems simpler than the preject above.
Using DrCOM, the whole COM analyzed by the tool is marked as 'Automated', and I actually could 'Invoke' the API function from DrCOM, such as 'Object.SendLogout()' which actually made the target app. behave that way. The target application received the message from the external tool, and was controled right way. Wonderful, I felt.
What I'd like to do is to 'Invoke' the command of COM that is the server of the target application from the external application that I will code in C#.
I posted on C# board, too.
Any comment? Thank you very much in advance.
Best,
Ken
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