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ULONG is not a compatible type with VB. Try using CInt function to see whether it works or return the ULONG as long from the server
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I've developed a DCOM component that accesses database by ODBC.
The problem is that if I use Interbase database I can't open the database.
I've made a component on Delphi and when I've tried to access it remotly an error is returned which says the table doesn't open.
When I've made the component on VC++ an error returns saying a denied access message.
When I've used MS Access database just changing the ODBC alias, everything works well.
The error has occured only when I've accessed the component through DCOM and hasn't occured when I've accessed it locally, through COM.
One of the customer's requirements is that the database MUST be on Interbase, and not on MS Access. Because of that I've needed an ODBC driver for Interbase that could be accessed remotely through DCOM.
Thank you in advance.  
Katiúcia Freitas da Silva
e-mail: katiucia@inatel.br
ICQ#: 127458845
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How is the DCOM component running as a service or a a local server?
If it is running as a service try making it run as a distinguished user.
For a local server try running it as the interactive user.
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Thank you very much for helping us!
Your answer has helped us to solve our problem.
You've got all what we needed.
 
Katiúcia Freitas da Silva
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I need to pass some structure information from a method of an interface. I think i should use a VARIANT to make it run in VB, because it doesn't support ** pointers.
Do you know how?
rechi
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It depends what it is you are trying to pass. You could use a VARIANT * (VT_BYREF | VT_VARIANT)
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It doesn't work. The code that fails in VB is:
STDMETHODIMP CInterface::Method(VARIANT *ppp)
{
TestStructure *p=new TestStructure;
p->Value=10;
ppp->vt=VT_VARIANT | VT_BYREF;
ppp->pvarVal=(VARIANT *)p;
return S_OK;
}
What is wrong?
rechi
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First define structure in IDL file (Example):
typedef struct MY_STRUCT
{
long lVal;
BSTR wsVal;
} _s1;
[
object,
uuid(BC922B3D-682B-11D6-A110-00B0D0C3D9BD),
dual,
helpstring("ITest Interface"),
pointer_default(unique)
]
interface ITest : IDispatch
{
[id(1), helpstring("method Foo")] HRESULT Foo([in,out] _s1 *sOut);
};
[
uuid(BC922B31-682B-11D6-A110-00B0D0C3D9BD),
version(1.0),
helpstring("ForVB 1.0 Type Library")
]
library FORVBLib
{
importlib("stdole32.tlb");
importlib("stdole2.tlb");
[
uuid(BC922B3E-682B-11D6-A110-00B0D0C3D9BD),
helpstring("Test Class")
]
coclass Test
{
[default] interface ITest;
};
};
C++ implementation of the function returning that structure to VB app.
STDMETHODIMP CTest::Foo(_s1 *sOut)
{
if(!sOut)
return E_POINTER;
sOut->lVal = 12345;
sOut->wsVal = ::SysAllocString(L"Some string.");
return S_OK;
}
This is VB code to get the structured data:
Private Sub Command1_Click()
Dim s As FORVBLib.MY_STRUCT
Dim obj As FORVBLib.Test
Set obj = New FORVBLib.Test
obj.Foo s
End Sub
soptest
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The following code works fine..
CoInitialize(NULL);
m_cRichEditCtrl.Create(ES_READONLY, rect, GetDlgItem(IDC_G), 1);
However the following fails..
CoInitializeEx(NULL, COINIT_MULTITHREADED);
m_cRichEditCtrl.Create(ES_READONLY, rect, GetDlgItem(IDC_G), 1);
I remember having read somewhere that RichEdit control uses OLE (ie CoInitialize(NULL)). Is that the problem ?
Any solution ? Thanks
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Yes I did..
Should I put "AfxInitRichEdit" Before or After CoInitialize..
Thanks
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Is there somewhere a tutorial of about how does the pluggins are created to Internet explorer. What is the specific for that - registry entries, implementing interfaces...
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RegSvr32: LoadLibrary("\Xyz.dll") failed
GetLastError returns 0x000003e6
Using VC++5.0. Thanks
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0x000003e6 = "Invalid access to memory location."
Like it or not, I'm right.
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Thanks for your response. I looked at the winerror.h and I found out about what error means etc.
I am looking for a solution ?
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I'm looking for a pointer in the right direction, if someone can help.
I need to create an ActiveX control which displays in a frame window and which can be hosted by IE. In other words, rather than a control which sits on the web page's background, I need the control to pop up in its own frame window. As various events happen on the web page, custom methods / properties on the control will be invoked. All the ATL samples and other examples I can find which have a UI / GDI aspect to them just sit on the web page's background. So I'm not sure the best way to go about this.
It would seem that, after creating an ATL project and adding an ATL ActiveX control, there are two options: 1) modify the generated code in the control to somehow make it a window with a frame that floats outside the browser's window. I'm not sure if that's feasible given that IE controls the window's creation and its initial style settings. 2) Make the control that IE knows about UI-free but have it create a frame window / control and perhaps delegate custom interface methods on the "main" control to this control. That seems feasible, but it always helps to see something nominally similar as a starting point.
If anyone could point me to an example or some docs that cover this type of control, I'd appreciate it.
Thanks,
Donnie
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Design you ActiveX as singleton and run that ActiveX in another IE window. By creating an instance of that object you always will have only one shared instance.
soptest
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I'm looking for a free alternative to ATL. Some sort of COM wrapper library that can be used with a free compiler like MingW or Borland C++. Is there such a thing?
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Yeap, there is, but is in beta stage
COMET
It's look promising, it only have a macro !!! The code uses templates instead to do message dispatching 
Cheers,
Joao Vaz
A person who is nice to you, but rude to the waiter, is not a nice person - Natalie Portman (Padme/Amidala of Star Wars)
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Interesting, I'll take a look at it. Thanks.
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Hi All,
I have a simple ASP page that connects to a COM Component to add some data to my Database, it works 100% apart from the fact that it runs it twice?
Is this a known problem or could someone explain how I can stop this.
Here is the code from my ASP Page
AppMonitor = Server.CreateObject("AppMonitor.LoginDetails").InitialLogin
(Application("cdscConnection"), gstrAccountName, Session.SessionID, stest)
and the actual component
Public Function InitialLogin( _
ByVal ConnectionString As String, _
ByVal AccountName As String, _
ByVal SessionID As String, _
ByRef stest As Variant _
) As Long
Dim UserID As String
UserID = "sa"
Dim Password As String
Password = ""
Dim sql As String
sql = "EXEC cdsc_TBTrace 0, '" & Replace(AccountName, "'", "''") & "', " & SessionID
On Error GoTo ErrorHandler
Set cn = New ADODB.Connection
cn.Open (ConnectionString)
cn.Execute (sql)
stest = "Success"
cn.Close
ErrorHandler:
With Err
stest = Err.Description & "<BR>" & Err.Number
End With
End Function
Thanks,
Gavin
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Sombody gave me a book about DCOM and its for VC6.I install VC7 now on my computer.Does ATL7 changes a lot and Does it have lots of difference if I use that book in VC7?
Thanks
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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hi~
Thanks for reading my problem. 
I'm not good at english.
I hope for u to understand me.
I make a DCOM service with Visual C++ 6.0.
I want that COM Server returns an array of datas, ex 10 number of integers.
I wrote idl like this.
[id(2), helpstring("method B")] HRESULT B([out] long* plCount, [out, size_is(, *plCount)] long** pplData);
and wrote implementation as follows,
STDMETHODIMP CMyB::B(long *plCount, long **pplData)
{
*plCount = 10;
*pplData = static_cast<long*>(::CoTaskMemAlloc(sizeof(long) * *plCount));
for (int nIndex = 0; nIndex < *plCount; nIndex++)
*(*pplData + nIndex) = 5000 + nIndex;
return S_OK;
}
when I call this method in client,
I expect the result like {5000, 5001, 5002, 5003...}.
but I get 5000 and gabarge. {5000, ....invalid data...}
I debuged server program and I can identifed all the elements are set correctly.
but client has only 1 data.
Why this occur?
How can I solve this?
and...
now, I treat 'long' type data.
but, I want to treat custom type(struct etc...) in the future, also.
I hope for u save me.
goodday~
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