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this code catches 0x80004005 exception all the time  , please help
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#import "C:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF", "EndOfFile")
void CServiceModule::Run()
{
//only relevant code
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
hr = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER, REGCLS_MULTIPLEUSE);
try{
m_pConnection.CreateInstance(__uuidof(Connection));
m_pConnection->Open("Provider=MSDASQL;DSN=XXX","","",adConnectUnspecified);
}
catch(_com_error &e){
//catched with 0x80004005 all the time
}
}
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It looks like you have your NT Service running under the Local Account, therefore you are getting standard Authentication problems.
From your code I can see that you are using the OLE DB provider for ODBC (MSDASQL)
If you use the MSDASQL provider (ODBC provider), then the DSNs
you reference will have to be system DSNs, but that's really more an ODBC issue and isn't relevant if you use a pure OLE DB driver.
I have got ADO working in an NT service, but using the direct OLE DB provider for SQL SERVER
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you were right, it was user DSN! now i'm using system DSN but the code still doesn't work, now catches 0x80040E4D
i've tried to connect directly to SQL server with
m_pConnection->Open("Provider=SQLOLEDB;Server=XXX;Database=MOSAZ", "", "", adConnectUnspecified);
and i'm getiing the very same exception - 0x80040E4D
SQL server uses Windows Authentication
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carlos is right you need to either Initialise your OLE libraries using
CoInitializeEx(NULL, COINIT_MULTITHREADED);
according to msdn it must be set to COINIT_MULTITHREADED, you are setting it to Apartment threading
or if you want it in apartment threading then use
CoInitialize(NULL);
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You put the Conitialize(NULL);????
cheers!!!
I made a lot of services using ADO.
If your problem persist, ask me.
Carlos Antollini.
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works fine now with just a little change
m_pConnection->Open("Provider=SQLOLEDB;Server=XXX;Database=YYY;uid=sa;pwd=casiopea", "sa", "xxx", adConnectUnspecified);
instead of
m_pConnection->Open("Provider=MSDASQL;DSN=XXX","","",adConnectUnspecified);
e.g. OLE DB not ODBC
thanx a lot, both of you
btw how i can use windows authentication instead of database user account?
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I have this weird problem: when I load IE directly, the BHO doesn't load; BUT, if I open a new window from within it, or if I load Windows Explorer, the BHO loads just fine (except it still doesn't load on the first instance of IE). I've tried it with a bunch of BHO's, including HTMLEdit, IE Helper, and even Stardock WebBlinds! Anyone here have more info on my problem, and/or if it is happening to anyone else? It might just be me  .
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Hello
Lets say you have a simple COM server dll that does nothing much.
now say you want to write an exe COM server that contains this dll COM server
is there anything special you need to do with the appwizard?
and how do you register the exe server as regsvr32 is failing
but VC++ has registered it [how do I unregister it now?]
and what did VC++ use to register it if it didnt use regsvr32
am confused...
any help is hugely appreciated
regards and thanks in advance
nish
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If you have written your COM EXE Server using atl, then to register the exe you do
mycomserver.exe /RegServer
regsvr32 is just for DLL's.
There should be no problem in calling a DLL COM server from a COM server EXE. I use this technique a lot.
Michael
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The basic rule of COM says, In COM, once you "publish" an interface contract by shipping a component, the contract is immutable—it cannot be changed in any way. You can not add. You can not delete. You can not modify.
But, when you open Microsoft Word 97/98 and Microsoft Word 2000 's .OLB files, you will see that for extending the interfaces, they have added methods to the old interfaces. For example, in MS Word 2000 they have added methods in Application interface, and all the other interfaces. Why So? I feel the right approach is to add new interface if you want to extend an interface. Can somebody tell me its' reason??
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I managed to get four files by compiling the *.idl file.But I have some problems in compiling the four files and the *.def file.When these files were being linked,I was told the following information:
MyProxy.def : error LNK2001: unresolved external symbol DllRegisterServer
MyProxy.def : error LNK2001: unresolved external symbol DllUnregisterServer
I think the *.idl file will define the two functions for me.Is it true?And what's wrong?Do I have to define the two functions on myself?Inform me of the details,please.Many thanks for you read my question.I'm waiting for your reply.Thank you for reading my question.
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Thank you for anyone try to help me.
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hey
since you cant run these things the only way to debug them is to run the calling client in debug mode and then to step into CoCreateInstance
but when I did that I got the message in the newly opened VS that there is no source code and so am I interested in seeing the disassembly
not apleasing sight - all that disassembled code - I can tell you that
so just how do i debug the code and put break points?
Nish
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Is your COM server a DLL?
If it is, load up the project and put a breakpoint in the code you want to debug.
In the Project Settings Debug Tab, set your client exe in the Executable for Debug Session. Hit F5, your client app will run. When it runs the code you are debugging Visual Studio will stop at your breakpoint.
Michael 
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nope
its an exe com server[containing a com dll]
and when I tried the above technique you suggested I got a msg saying that the breakpoints cannot be set and so program will break at the beginning of the program
I am in the process of learning some COM
not much luck so far
Nish
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Try stepping into the Invoke call instead of the CoCreate call. That works for me. When the new VS IDE comes up, it will be in some Microsoft ole code. If you don't have the source for the MS code you will get the kind of message you describe. Just press on.
When the new IDE opens up, open the source file(s) for your server, insert break points and hit GO. For some reason, breakpoints set up in the original IDE don't work while debugging. If you save the second environment (when prompted) the break points will be retained.
Hope this helps,
Bill
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Hello
I am having some trouble....
I knew it was faliling at the CoCreateInstance so I did these checks...thinking that CoCreateInstance returns only one of three values and nothing else
if(hr==REGDB_E_CLASSNOTREG )
MessageBox("REGDB_E_CLASSNOTREG trouble");
if(hr==CLASS_E_NOAGGREGATION)
MessageBox("CLASS_E_NOAGGREGATION trouble");
if(hr==S_OK)
MessageBox("S_OK");
But I dont get mesg boxes.
so I tried this
DWORD d1=GetLastError();
and put a break point on the next line
d1 was 1008...which stands for An attempt was made to reference a token that does not exist.
whats that supposed to mean????
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in debug, after the call to CoCreateInstance
on the WATCH variables window type "hr,hr" this will display the error string for the call to CoCreateInstance.
Normski - Windows Professional Programmer
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Hi Norm
I did that and got this
E_NOINTERFACE
Nish
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Is object properly registered, have you execeed the method count (check your IDL)?
Normski - Professional Windows Programmer
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actually its a simple container com server
was trying out how to create a container com server
I created it as an exe
I guess that might be the whole trouble
I put a mesg box in the oevr-ridden FinalConstruct()and am getting it okay
Thus I know its registered and I also know its getting called
but some other error
by the way when I manually tried to register it using regsvr32 I got an error. apparently you are not supposed to do that. am quite new to COM and am dead-stuck!
I tried to call the same container server from VB and got some VB error message saying the component doesnot have an exposed interface or some such stuff
maybe I did something wrong with the app wizard options
there are too many options and I must have selected one wrong radio button or hit the wrong chk box...
Nish
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prolly containing servers are a bad idea
waaaaaaaaaaaaaaaaaah
Nish
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Whats the application do?
Normski - Professional Windows Programmer
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The error code you got when you tried to register manually, is describing what you have done wrong in your implementation.
Placing COM objects inside a .EXE is creating what is called a Full Server. This is a common technique and works quite well.
I sounds like the problem is in the component iteself. Pay attention to the error returned from the manual registration attempt.
Hope this helps,
Bill
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Sorry to bother you guys yet another time , but I keep getting a stack overflow whenever I call this line:
g_pThis->m_spWebBrowser2->ExecWB(OLECMDID_NEW,OLECMDEXECOPT_DODEFAULT,Var1,Var2);
I thought I was doing everything right, but I guess not... 
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