DCOM permissioning problems - COM Discussion Boards

Re: "interface not compatible"

10-Mar-04 20:33

hi,

what is the meaning of the error "interface not compatible" returned by HRESULT? In the client I include the server header file which contains the definition of the remote interface. So, it must be the same interface.

Thanks!!!

emilius1921-Mar-04 5:22

emilius19

21-Mar-04 5:22

hello,

i think i know what is the problem: I also need a proxy/stub DLL. So, I need to register the proxy/stub DLL on both the client and the server computers.

To regisrer the DLL on the server i have done:
nmake -f Projectnameps.mk
where projectname is the name of my project. This command has built several files, included the Projectname.dll file.

Now the problem is that i dont know very well how to register the DLL on the client. I have tried two differents things:
1.- Set up the remote activation using progammatic changes to the client (call CoCreateInstanceEx()instead CoCreateInstance()(),...).But it doesn't run.
2.- Follow the instructions of this article http://www.apostate.com/programming/reg-atl-dcom.html
but i dont understand very well the last step: "Use DCOMCNFG to change the execution location of your server from Run application on this computer to Run application on the following computer", and this way to register the DLL sounds a bit rare, doesn´t it?.

I am confused... Can you help me?
thanks.

How do I access my ActiveX array from the outside?

Stephen McGeown9-Mar-04 10:48

Stephen McGeown

9-Mar-04 10:48

Hi,

Supposing I have a 2D array of chars in my ActiveX component, how do I make my array visible to an MFC application inside of which I want to embed the control?

I have read about the Get/Set methods - in theory I should be able to return a pointer to the first element in the array to my app but how is this done???? Do I have to convert or map my 2D char array as a VARIANT type and use this in the Get method?

If anybody has an example of this kind of thing or detailed advice that would be great. I just can't find an example of this anywhere Sigh | :sigh:

I am using Visual C++ 6.0 to develop my ActiveX control and the MFC app.

Cheers, Stephen

How can I add a tab control to a ATL Property Page?

larsibam9-Mar-04 4:37

larsibam

9-Mar-04 4:37

I've created a Connection Page (in the Data Source Object of my OLE DB Provider) to be displayed by the Data Link core component.
Now I'm trying to add a tab control on the page using CreateWindow with the WC_TABCONTROL class (being registered through InitCommonControlsEx(...).
But I can't get the Instance Handle needed by CreateWindow,
because
hInst = (HINSTANCE)::GetWindowLong(hwndParent, GWL_HINSTANCE);

always returns 0x0000000.
(I've received the hwndParent through the IPropertyPage::Activate Method, that's being called by the Data Link core component)

How can I get that Instance Handle? Or is there another way of using a tab control on my property page?

DCOM permissioning problems

Jeremy Osner9-Mar-04 2:19

Jeremy Osner

9-Mar-04 2:19

We recently upgraded to Windows 2000 and I am having a little trouble with DCOM. I have an application which runs on one of my workstations as a server to applications on another workstation and a colleague's workstation. It works fine between my two computers but when my colleague tries to invoke it he gets a permission denied message.

The server application has a user interface, so we specified it to run under the INTERACTIVE identity. Also I set up custom launch and access permissions so that my colleague is allowed to launch and access, and I made him an administrator on my machine for good measure. This worked fine under NT 4 but apparently it is not good enough under Win2k. What am I missing?

READIN writin rhythmetic

Invalid Number of Parameters?!!

Member 3538108-Mar-04 17:43

Problem with Word automation/Shapes/AddCurve

8-Mar-04 17:43

"Invalid Number of Parameters"

This isn't my best day... I get some very strange bugs...

I use MS Visual Studio .NET typelib wizard to create a class for CanvasShapes Word object. I obtain the object, then I call one simple method of it. Simple textbook thing.

And I get the error message: "Invalid Number of Parameters"! Not during compilation, but during runtime!!!

W_Shapes sh = wdoc.get_Shapes();
W_CanvasShapes csh = sh.AddCanvas(0,0,500,500, covOptional);
csh.AddLine(0,0,100,200);
Produces the error!

What is going on here?

8-Mar-04 15:15

Hi!

I try to do very simple thing:

- Start Word from Visual C++/MFC OLE automation
- Get Shapes object
- Use AddCurve to add Beizer curve

When I run the application, I get error message:
The specified value is out of range.

I tried to do all sorts of things, to pass different types to as COleSafeArray elements, change the value of vertices... nothing works!

When I use AddLine, everything works without a glitch.

////////////////

_Shapes sh = wdoc.GetShapes();

COleSafeArray saRet;
DWORD numElements[2];
numElements[0] = 2;
numElements[1] = 2;

short sngArray[2][2];
sngArray[0][0] = 91;
sngArray[0][1] = 92;
sngArray[1][0] = 93; //50;
sngArray[1][1] = 94; //50;
/*sngArray[2][0] = 0; //100;
sngArray[2][1] = 0;

sngArray[3][0] = 0; //300;
sngArray[3][1] = 0;*/

long index[2];

// Create a double safe array
saRet.Create(VT_R4,2,numElements);

// Fill the array with data.
for (int iRow = 0; iRow < 2; iRow++) {
for (int iCol = 0; iCol < 2; iCol++) {
index[0]=iRow;
index[1]=iCol;
float d = sngArray[iRow][iCol];
// saRet.PutElement(index, COleVariant(d));
saRet.PutElement(index, &d);
}
}

sh.AddCurve(saRet, covOptional);
/////////////////

Re: Problem with Word automation/Shapes/AddCurve

Member 3538108-Mar-04 15:22

Re: Problem with Word automation/Shapes/AddCurve

8-Mar-04 15:22

PS Alternativelly, if you have any Visual C++/MFC code that uses AddCurve and works - it would be great! I could not findy anything on either google or yahoo... depressing!

Vi28-Mar-04 18:45

Vi2

8-Mar-04 18:45

You should specify more points, because MSDN says: "Note that you must always specify 3n + 1 points, where n is the number of segments in the curve".

With best wishes,
Vita

Thanks, but that isn't a problem

Member 3538108-Mar-04 19:10

Re: Thanks, but that isn't a problem

8-Mar-04 19:10

Thanks, but that isn't a problem - when I specify either 4 or 7 points, it sitll does not work. Ie, this code fails the same way:

COleSafeArray saRet;
DWORD numElements[2];
numElements[0] = 7;
numElements[1] = 2;

short sngArray[7][2];
sngArray[0][0] = 0;
sngArray[0][1] = 0;

sngArray[1][0] = 100; //50;
sngArray[1][1] = 200; //50;

sngArray[2][0] = 0; //100;
sngArray[2][1] = 0;

sngArray[3][0] = 0; //300;
sngArray[3][1] = 0;

sngArray[4][0] = 0; //300;
sngArray[4][1] = 0;

sngArray[5][0] = 0; //300;
sngArray[5][1] = 0;

sngArray[6][0] = 0; //300;
sngArray[6][1] = 0;

long index[2];

// Create a double safe array
saRet.Create(VT_R4,2,numElements);

// Fill the array with data.
for (int iRow = 0; iRow < 7; iRow++) {
for (int iCol = 0; iCol < 2; iCol++) {
index[0]=iRow;
index[1]=iCol;
float d = sngArray[iRow][iCol];
saRet.PutElement(index, &d);
}
}

Vi28-Mar-04 19:26

Vi2

8-Mar-04 19:26

If the problem does not associated with the dimension of the array, hence it happens by "covOptional" in "sh.AddCurve(saRet, covOptional)". How you specify this value? COleVariant covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR)?

With best wishes,
Vita

Re: Thanks, but that isn't a problem

Member 3538108-Mar-04 23:20

I can't beleive that I wasted so much time with this

8-Mar-04 23:20

Yes, exactly as:
covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR)

how should I specify it otherwise?!

Member 3538109-Mar-04 0:56

MFC executable registration.

9-Mar-04 0:56

I can't beleive that I wasted so much time with this... and still I did not get it to work! What a day...

oleg638-Mar-04 12:25

oleg63

8-Mar-04 12:25

Hi All,

My MFC based EXE COM server have to be automatically installed end registered by Install Shield Express, but MFC based executable COM doesn't generate appropriate Register/Unregister routines.

How it's can be implemented?
Thanks, Oleg.

Re: MFC executable registration.

Mike Dimmick16-Mar-04 2:31

Mike Dimmick

16-Mar-04 2:31

The convention for an EXE is that passing the parameter /regserver will register the server, while passing /unregserver will unregister it.

The Wizard-generated MFC code will have produced an override of CWinApp::InitInstance which creates a CCommandLineInfo which is then passed to CWinApp::ParseCommandLine. When this returns it then calls CWinApp::ProcessShellCommand.

You can hook into this by deriving your own class from CCommandLineInfo, overriding ParseParam, and performing the necessary registration steps in response to the appropriate command line. You should exit (by returning FALSE from InitInstance) after processing a registration flag.

You can use AfxOleRegisterTypeLib to register your type library and COleObjectFactoryEx::UpdateRegistryAll to register all the known classes.

Stability. What an interesting concept. -- Chris Maunder

Re: MFC executable registration.

oleg6316-Mar-04 4:14

oleg63

16-Mar-04 4:14

Thanks Mike,
I've found the simpliest solution.

enum eRegistration{eNothing, eRegisterServer, eUNRegisterServer};
eRegistration process_program_arguments(LPSTR m_lpCmdLine);
...
App::InitInstance()
{
...
if (cmdInfo.m_bRunEmbedded || cmdInfo.m_bRunAutomated)
return TRUE;

if (cmdInfo.m_nShellCommand == CCommandLineInfo::AppUnregister)
{
m_server.UpdateRegistry(OAT_DISPATCH_OBJECT);
COleObjectFactory::UpdateRegistryAll(FALSE);
}
else
{
m_server.UpdateRegistry(OAT_DISPATCH_OBJECT);
COleObjectFactory::UpdateRegistryAll();
}
if (!ProcessShellCommand(cmdInfo)) // Dispatch commands specified on the command line
return FALSE;

if(process_program_arguments(m_lpCmdLine))
return FALSE;

...
...
}

eRegistration process_program_arguments(LPSTR lpCmdLine)
{
char* lpProgArg = _strdup( lpCmdLine );
char seps[] = " -/"; // program arguments separators
char Register[] = "regserver";
char UNRegister[] = "unregserver";

eRegistration ret = eNothing;

char *token = strtok( lpProgArg, seps );
while( token != NULL )
{
if ( !strcmp(token,Register) )
{
ret = eRegisterServer;
}
if ( !strcmp(token,UNRegister) )
{
ret = eUNRegisterServer;
}
token = strtok( NULL, seps );
}
free( lpProgArg );
return(ret);
}

In StdAfx.cpp
#include <afxctl.h>

That's it.
Thanks for hint.
Oleg

ussoftproblem with COM server registration???

pelos7-Mar-04 4:41

7-Mar-04 4:41

hello!

I am learning the MS COM/DCOM architecture.
I ve developed a few simple client/server programs and I ve obtained always the same result: I think client cannot get the object.

I ve used C++ with Microsift Visual C++ 6.0.

To make the server I ve followed the next steps:
1- create an ATL COM AppWizard Project.
2- EXE Server.
3- New ATL object (simple object)
4- Add methods to Interface
5- Code the methods.
6- Build the project
it shows me:
Compiling resources...
Compiling...
Linking...
Performing registration
Server registration done!

..and client is something like this:

const IID IID_IHelloObj = {0x389A6DD0,0xC789,0x463F,{0x87,0xD5,0x8C,0x3A,0x51,0xDC,0xB4,0xDF}};
const CLSID CLSID_HelloObj = {0x1635DA5A,0xD02E,0x4049,{0xB9,0x21,0x07,0xE1,0x81,0x55,0xB2,0x0E}};

void main()
{
HRESULT hr;
IHelloObj *IHello;
int num; // to test the service

hr = CoInitialize(0);
if(SUCCEEDED(hr))
{
hr = CoCreateInstance(CLSID_HelloObj,
NULL, CLSCTX_INPROC_SERVER,
IID_IHelloObj,
(void**)&IHello);

if(SUCCEEDED(hr))
{
hr=IHello->GetNumber(&num);
hr=IHello->Release();
}
else
cout << "error";
}
CoUninitialize();
}

This is all what i ve done.
Must i do more things to run the service?
What can be the cause of the error?

Thanks in advance!!!

Steve S7-Mar-04 22:03

Steve S

7-Mar-04 22:03

0. What value is in hr, and when? This will tell you more about what's going wrong.
1. Are you sure you're using the correct interface IDs and class IDs?
2. Have you tried using CLSIDFromProgID to get your clsid instead?

Steve S

pelos8-Mar-04 11:37

8-Mar-04 11:37

hello,

0.
com_error error(hr) (first, construct a _com_server)
HRESULT_FACILITY(hr) returns 4
HRESULT_SEVERITY(hr) returns 1
error.ErrorMessage() returns "Class not registered"

1.
I think so ... I get the IID and the CLSID from the _i.c file in the External Dependencies of the server project.

2. No, i haven´t. I dont know how to get the ProgID (the first parameter).
I search it in some documentation and i find something like:
hr = CLSIDFromProgID(OLESTR("Project_name.Object_name"),&pClsid);
but it does not run (error.ErrorMessage() returns "class String is not valid")

3. I ve tried to initialize as MTA instead with
CoInitializeEx(NULL, COINIT_MULTITHREADED) but i dont know what header files must i include. Is CoInitializeEx supported in Visual C++ 6.0 or is a .NET function???

A lot of thanks!!

Anonymous8-Mar-04 9:36

Anonymous

8-Mar-04 9:36

You initialized client as single threaded apartment. It won't work if you don't have message queue.
Try to initialize as MTA instead:
CoInitializeEx(NULL, COINIT_MULTITHREADED)

Edward

Class not registered

pelos9-Mar-04 20:06

9-Mar-04 20:06

Hello,

Finally, i ve used the CLSIDFromProgID function (CLSIDFromProgID(OLESTR("HelloServer.HelloObj.1"),&pClsid)) but the result is the same:
"Class not registered"

I ve sawn the windows register and i think there are all the data related with the registration:

LocalServer32 - path of the EXE server (HelloServer.exe)
ProgID - project_name.object_name.method (HelloServer.HelloObj.1)
Typelib - a String {FF638 ....)
VersionIndepentProgID - HelloServer.HelloObj

Apart from this, I ve tried to initialize as MTA instead with
CoInitializeEx(NULL, COINIT_MULTITHREADED) but the builder does not find this function and i dont know what header files must i include.

thank you very much.