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Hello, I'm having a problem obtaining an interface pointer (ICreateCar*) on an inproc server that is hosted in dllhost.exe and am unsure if I am overlooking something. Funny as it may seem, if I use the CLSCTX_INPROC_SERVER in the CoCreateInstance or CoGetClassObject call it's successful and I am able to use the requested interface pointer. If I use CLSCTX_LOCAL_SERVER and check the HRESULT after the CreateInstance call has returned the return value is "-2147221163" (Interface not Registered). I have stepped through the code with the Visual C++ Debugger and I'm finding that when I call CreateInstance on a class factory pointer, CreateInstance is able to obtain a valid interface pointer through the QueryInterface call. The HRESULT that is returned from this QueryInterface call is the value that is returned from CreateInstance (in this case it's 0). When I check the HRESULT that is returned from CreateInstance it's not the same value that was returned from the QueryInterface call that was performed in CreateInstance.
Please help, what am I doing wrong?
Thank you.
Client code
<code>
CoInitialize(NULL);
HRESULT hr;
IClassFactory* pCF = NULL;
ICreateCar* pCreateCar = NULL;
hr = CoGetClassObject(CLSID_CoCar, CLSCTX_LOCAL_SERVER, NULL, IID_IClassFactory, (void**)&pCF);
if (SUCCEEDED(hr))
{
hr = pCF->CreateInstance(NULL, IID_ICreateCar, (void**)&pCreateCar);
pCF->Release();
if (SUCCEEDED(hr))
{
pCreateCar->SetMaxSpeed(100);
}
}
</code>
CreateInstance
<code>
STDMETHODIMP CoCarFactory::CreateInstance(IUnknown* pIUnk, REFIID riid, void** ppvObject)
{
if (pIUnk != NULL)
{
return CLASS_E_NOAGGREGATION;
}
CoCar* pCoCarObj = NULL;
HRESULT hr;
pCoCarObj = new CoCar();
hr = pCoCarObj->QueryInterface(riid, ppvObject);
if (FAILED(hr))
{
delete pCoCarObj;
}
return hr;
}
</code>
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Q: Please help, what am I doing wrong?
A: IMHO, you forgot the marshalling code (proxy/stub DLL) for your interface.
With best wishes,
Vita
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Thanks for your help! I did find my problem. The interfaces were not marked with the [oleautomation] attribute. I also did not have the correct information in the system registry (HKCR\Interfaces). I used LoadTypeLibEx to automatically load this information into the system registry.
Thanks again for pointing me in the right direction. 
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Hi,
It may be a stupid question but i am brand new in this area and knows practically nothing.
I am trying to reuse code (implements a band) in order to capture the post data from a web page (that is posted by IE) and send it to my server.
I am trying to use:
Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags,
DISPPARAMS* pDispParams, VARIANT* pVarResult,
EXCEPINFO* pExcepInfo, UINT* puArgErr)
pDispParams->rgvarg[2] in case : DISPID_BEFORENAVIGATE2 to access the post data but always fail (it is empty or i am doing something wrong to get it).
I m using c++.
Can anyone help ?
thanks
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Sometime back I too had a similar question. Got the answer from the MS atl newsgroup but I cannot find that post at the moment.
Hush,hush...
thought I heard you call my name now.
Kula Shaker.
Amit Dey
Latest articles at CP -
Writing Word addins
Office addin
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I have the post data as a string now, but still fail to post it using Navigate, my server recievs a GET request with no post data:
CComVariant varPost(*pDispParams->rgvarg[2].pvarVal);
varPost.ChangeType(VT_BSTR);
LPCSTR lpszPost = (LPCSTR)varPost.bstrVal;
string post_str(lpszPost);
if(strlen(lpszPost))
{
if( (post_str.find("city1") != npos && post_str.find("citd1") != npos &&
post_str.find("time1") != npos && post_str.find("date1") != npos &&
post_str.find("time2") != npos && post_str.find("date2") != npos)
||
(post_str.find("sector1_o") != npos && post_str.find("sector1_d") != npos))
{
string post_url(FC + travel_mate_url);
m_spWebBrowser2->Navigate(CComBSTR(post_url.c_str()), &vtEmpty, &vtEmpty, &varPost, &vtEmpty);
VARIANT vtBandGUID, vtShow;
vtBandGUID.vt = VT_BSTR;
vtBandGUID.bstrVal = SysAllocString(OLESTR("{BE8D0059-D24D-4919-B76F-99F4A2203647}"));
vtShow.vt = VT_BOOL;
vtShow.boolVal = true;
m_spWebBrowser2->ShowBrowserBar(&vtBandGUID, &vtShow, 0);
SysFreeString(vtBandGUID.bstrVal);
}
}
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I installed the Windows SDK on machine A. I compile my stuff on machine B specifying the include and lib search path on machine A. Everything compiles and links fine since it finds all the .h and .lib in the search path on machine A. My problem is at runtime. When I run the code CoCreateInstance returns "Class not registered". I understand that all classes have been registered on machine A and machine B is not aware of classes I try to create on machine B. So here's the question: How do I register a CoClass contained in a .lib without installing the whole SDK. I'd also like to avoid #importing the nor "LoadingLibrary". To give you a bit more info about this, the class I try to create an instance of is IID_IXMLDOMDocument2 from the msxml2.lib. Anyone have an idea?
Thanks
Jean-Francois !
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hi there
i wanted some help inorder to avoid a crash of the test container.After i insert my control into the test container, the container crashes after an exact "Certain" amount of time...always..
i mean when i insert the control, the control crashes after about 30 seconds..what possible problems can be there???
ne suggestions will be most valued..
thanks and regards
safee
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More specifics would help. What does your control do? Can you send source code?
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I have been reading Visual C++.NET by George Shepherd and I ran into something that didn't quite jive with me. Look at the following first:
struct CSpaceship : IMotion. IDisplay
{
ULONG m_cRef;
HRESULT QueryInterface(REFIID riid,
void** ppv);
ULONG AddRef()
{
return InterlockedIncrement(&m_cRef);
}
ULONG Release()
{
ULONG cRef = InterlockedIncrement(&m_cRef);
if(cRef == 0)
{
delete this;
return 0;
}
else
return m_cRef;
}
};
Possibly this isn't a complete implementation of Release(); but shouldn't m_cRef be decremented somewhere in Release();? I can't see how the InterlockedIncrement(); could do this because it is being called in AddRef(); as well as in the Release(); method.
-Nick Parker
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Interesting. Maybe it it is an error. Otherwise, the server is testing to make sure the client has released all pointers and m_cRef is actually at zero. One situation is multithreading.
Kuphryn
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I think it might be a typo mistake.. i feel it should be interlockeddecrement() function called instead of the increment!! for otherwise.. the component will never die..! or the cref==0 will never happen! as each time the value will always increase!
Aravinthan
<hr>
Visit me:
http:
When you know something.. its meant to share with others :-) for otherwise that knowledge has no worth:-)
mail me:
aravinthan@rediffmail.com
<hr>
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The activeX has to read the information of a file which locates on the sever.
I notify the activeX the file URL(such as "http://10.0.10.10/test.i3d"), how can the activeX control download the specified file?
stanley
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One solution is winsock.
Kuphryn
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Hi,
I need to access the native COM provided by adobe for manipulating PDF's in my .NET application. Once i added a reference to it through the .NET IDE, i am not able to create an object as all the members within the namespace are interfaces. Am i doing something wrong?? If not can somebody suggest a work around for this???
Regards,
SLN
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Hi,
I am trying to integrate (initiate calls) to a third party software application sitting on another box (BOX B) which only provides a set of function calls exported from its own dynamic link library (.dll). The vendor for the third party application sitting on another box I'm trying to integrate to doesn't want to do any development effort, other than to provide the .dll file. They provided interface examples for VB, C/C++, and MicroFocus Cobol. However, these codes will only work if the it is sitting in the same box (BOX B) as that app.
On my part, the integration software (in BOX A) I'm using will be able to initiate to invoke DCOM objects. However, I'm completely at a lost as to how to create a DCOM object which is able to invoke the dll on BOX B. Can anyone advise and help me in this matter?
Regards,
KY
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Im getting a COM+ error which is like
The system has called a custom component and that component has failed and generated an exception. This indicates a problem with the custom component. Notify the developer of this component that a failure has occurred and provide them with the information below.
Component Prog ID:
Server Application ID: {5C36819D-0094-454E-B9D2-C5B9C8FA34CE}
Server Application Name: TransactOnline
The serious nature of this error has caused the process to terminate.
Exception: C0000005
Address: 0x779D9256
Call Stack:
OLEAUT32!SysFreeString + 0x46
RPCRT4!NdrServerInitialize + 0x288
RPCRT4!NdrStubCall2 + 0x570
RPCRT4!CStdStubBuffer_Invoke + 0xC5
OLEAUT32!UserEXCEPINFO_free_local + 0x2114
+ 0xFFFFFFF7
+ 0x8820B0A8
------------------------------------------------
I have found out the that error to a particular structure which is
typedef struct XXXX
{
BSTR A_account;
BSTR B_Date;
BSTR C_Date;
BSTR D_Date;
} YYYY
In Sysfreestring(YYYY.B_Date),it is failing and giving errors.
I have initialised this structure through VB and passed to COM.
Moreover,when i build this on my machine (all params and environments are same), this works good.
The only difference between the "original Build machine" and my machine is i have Visual Studio SP5.
Any suggestions?..
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Sounds like you need to dump out what the values (and addresses) in the structure are. The error you're getting sounds like a BSTR being freed twice, or similar.
Steve S
[This signature space available for rent]
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I feel this B_Date is already freed somewhere else..!
check if b_date is not null and pointing to a valid address!
-Aravinthan
<hr>
Visit me:
http:
When you know something.. its meant to share with others :-) for otherwise that knowledge has no worth:-)
mail me:
aravinthan@rediffmail.com
<hr>
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Any COM experts around here?
If an inproc server is implemented in a DLL then is it possible that two clients running in two different process (in the same machine) can load the same COM server DLL into thier own address space?
Inproc COM servers are implemented in DLL's, does that mean I can create as many instances of this server as possible (just like a DLL?) ?
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Yep, and the really cool thing is, on NT, they are mapped to the same binary file, and don't know it, though of course they do not have each others data mapped, just the binary image of the DLL.
Thats how you can have say 100 processes running all making use of user32.dll don't eat up loads of memory as NT hides that fact that its shared.
"Je pense, donc je mange." - Rene Descartes 1689 - Just before his mother put his tea on the table.
Shameless Plug - Distributed Database Transactions in .NET using COM+
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Hi everyone,
Does anyone know why I can't seem to run multiple MSWord applications simultaneously? I am running a multithreaded server that opens a Word application per thread. The server then open documents and prints them. It works fine if I put a sleep statement in the code, which suggests that there is a synchronization issue. Here is psuedo code to help explain:
#include <atlbase.h>
#import "C:\WINNT\ServicePackFiles\i386\mqoa.dll" no_namespace
#import "C:\Program Files\Microsoft Office\Office\mso9.dll" raw_interfaces_only
#import "C:\Program Files\Microsoft Office\Office\msword9.olb" raw_interfaces_only rename("ExitWindows","WordExitWindows")
class MSWord()
{
public:
MSWord ()
{
m_hResults = CLSIDFromProgID(“Word.Application”, &clsid);
if (FAILED(m_hResults))
{
throw “Error”;
}
m_hResults = m_pWord.CreateInstance(clsid, NULL);
m_hResults = m_pWord->get_Documents(&m_pDocs);
}
void printDoc(string strDoc)
{
CComBSTR comBstr = strFile.c_str();
CComVariant var(comBstr);
VARIANT vOpt;
vOpt.vt = VT_ERROR;
vOpt.scode = DISP_E_PARAMNOTFOUND;
m_hResults = m_pDocs->Open(&var, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &pDoc);
if (FAILED(m_hResults))
return;
m_hResults = pDoc->PrintOut(&vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &var, &vOpt);
if (FAILED(m_hResults))
{
cout << " Failed to print " << endl;
return;
}
Sleep(20);
pDoc->Close(COleVariant((short)false), &vOpt, &vOpt);
::SysFreeString(comBstr);
}
private:
Word::_ApplicationPtr m_pWord;
Word::DocumentsPtr m_pDocs;
Word::_DocumentPtr pDoc;
CLSID clsid;
};
static void Foo()
{
MSWord msWord;
MsWord.PrintDoc(“Hello.doc”);
}
void main(void)
{
HANDLE hThreads[10];
for (int I = 0; I < 10; ++I)
hThreads[I] = CreateThread(Foo);
WaitForMultipleObjects(hThreads, INFINITE);
}
Is there a way to create only one Word application and pass it to all of the threads?  I’m using MSVisual C++ 6.6 compiler.
Any help would be greatly appreciated. 
Ken
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<quote>Is there a way to create only one Word application and pass it to all of the threads?
MSWord ()
{
m_hResults = CLSIDFromProgID("Word.Application", &clsid);
if (FAILED(m_hResults))
{
throw "Error";
}
m_pWord.GetActiveObject(clsid);
if( !m_pWord )
m_hResults = m_pWord.CreateInstance(clsid, NULL);
if( m_pWord )
m_hResults = m_pWord->get_Documents(&m_pDocs);
}
With best wishes,
Vita
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Hi, thanks for the help. 
I tried your suggestion but I can't get it to work. When I pass a pointer of MSWord to each of the threads the threads error on the open function.
m_hResults = m_pDocs->Open(&var, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt, &vOpt,
&vOpt, &vOpt, &vOpt, &vOpt, &pDoc);
If I create an instance of MSWord object in each thread then each thread gets its own instance of Word.exe from the "m_hResults = m_pWord.CreateInstance(clsid, NULL)" function. That’s because m_pWord is NULL for each object’s constructor that is created by each thread.
So, I’m still wondering how to get one instance of MSWord in each of the threads.
Thanks again,
Ken
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