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HI all,
I need to pass safearray of user defined data type( my structure ConInfoStruct) from the COM server dll to MFC client. I declared my structure in IDL file like this:
typedef [uuid(F5C2F02A-09D3-4fca-B5A9-5413009F6365)] struct tagConInfoStruct
{
ULONG m_ipAddress;
USHORT m_appType;
ULONG m_appID;
}ConInfoStruct;
when i build this code, MIDL doesnt generate GUID for the above structure. So Retrieving IRecordInfo pointer using UUID_ConInfoStruct from the client failed as UUID_ConInfoStruct is an undeclared identifier. Has anyone faced this problem before. Please let me know a solution for this problem.
thanks
bharani
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Remove the "tag" part from "tagConInfoStruct"! Also you should use OLE Automation types if you want use this structure in OLE client. Both ULONG and USHORT are incompatible with OLE. Use signed long and short types.
typedef [uuid(F5C2F02A-09D3-4fca-B5A9-5413009F6365)]
struct ConInfoStruct
{
LONG m_ipAddress;
SHORT m_appType;
LONG m_appID;
}ConInfoStruct;
With best wishes,
Vita
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Anyone knows what message ids com use for marshaling calls??
/Magnus
- I don't necessarily agree with everything I say
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In a MS Word automating program, I want to get a ShapeRange from a Shapes object, which need a SafeArray parameter. I wrote the following code:
------------------------------------------
COleSafeArray sa;
DWORD bounds=1;
sa.Create(VT_VARIANT,1,&bounds);
COleVariant v_ind((long)1,VT_I4);
long ind=0;
sa.PutElement(&ind,&v_ind);
//sa.Detach();
CShapes shapes(doc.GetShapes());
CShapeRange sr(shapes.Range(sa));
-------------------------------------------
It just throws an exception saying that the parameter has an invalid value. If I Detach the array before passing it to the Range method, the array becomes empty. Another exception is thrown out saying that out of bound.
Anyone can tell me how can I get it right?
Thx
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Don't know about Word automation, but maybe it expect different type of SAFEARRAY - now you are passing to him an array of VARIANTs of type VT_I4, maybe he want's to accept only array of VT_I4 directly.
Or another possibility is, when I did something small with Word, he expected some number, but because it was optional, it had to be stored in VARIANT, so I feed him with VARIANT with VT_I4, but it failed with 'Bad parameter'. After playing a bit I found, that the beest expect to be filled with type set to VT_I2 and suddenly everything worked...
Hope this helps.
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Have I understood this correctly, you want to receive a SafeArray from your call to shapes.Range ()? And this SafeArray will be populated with ULONGS?
Have a look at Chris Sells' SAFEARRAY Wrapper class:
http://www.sellsbrothers.com/tools/comvector.h
You should use it like this, where Size is the number of elements you are expecting back:
<br />
CComVector<ULONG> v (Size);<br />
CComVectorData<ULONG> rg (v);<br />
SAFEARRAY* sa = 0;<br />
v.DetachTo (&sa);<br />
<br />
CShapes shapes(doc.GetShapes());<br />
CShapeRange sr(shapes.Range(sa));<br />
<br />
for (int i = 0; i < rg.Length (); i++)<br />
{<br />
DWORD Value = rg[i];<br />
}<br />
Hope this helps
Jon 
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Hi
How to detect, if EXE COM is running form other application via COM call?
I 'd like to disable running executable COM as standalone application.
Thx 4 hlp
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Running COM objects are registered in the ROT (Running Object Table). To get the ROT, just use the GetRunningObjectTable(...) WIN32 API function.
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What language are you using? If VB6 then:
>The App.StartMode property will tell you whether you are running in standalone mode
>You can disable stand-alone execution by setting the start mode option to "ActiveX Component" in the Component tab of the Project Properties.
>VB objects are not registered in the running object table unless you register them there.
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I use C/C++ in the executable COM and in the client.
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If EXE server starts by COM system, his command line contains the "Embedding" keyword.
OTOH, you can specify the necessary keyword(s) in .rgs file under "LocalServer32" key. E.g.
LocalServer32 = s '%MODULE% -Automation'
With best wishes,
Vita
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I want to pass a SafeArray to a VB Client but I can't seem to get the right syntax for the IDL.
Can someone please help me.
Forever Developing
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[attributes] LPSAFEARRAY *varname
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I should have been more clear.
I want to pass the SafeArray pointer out to VB 6 in ATL 3.0.
I used to be able to do this with the following code.
foo(SAFEARRAY(long) *psa);
However the same thing in ATL 7.0 won't compile
NOTE: I am using an emedded idl VS.NET
//Actual code
#define _ATL_ATTRIBUTES 1
#include "stdafx.h"
#include "resource.h"
#include "atlbase.h"
#include "atlcom.h"
#include "oleauto.h"
#include "atlsafe.h"
#include "oaidl.h"
// The module attribute causes DllMain, DllRegisterServer and DllUnregisterServer to be automatically implemented for you
[ module(dll,name="ATL7TEST")];
[object, dual, uuid(4D9BCA91-2F02-4cee-A589-2CC4D9821156)]
__interface IATL7TEST
{
HRESULT TestRaiseEvent();
};
[object,uuid("8D0F6D5E-DDC3-4371-BB08-49864F5DE356")]
__interface _IATL7EVENTS
{
HRESULT MyFirstEvent(SAFEARRAY(long*) *varname );
};
[coclass, uuid(EBAA6CB2-ED31-4e08-8DF8-068B2978C3F7),event_source(com)]
class TESTING :
public IATL7TEST
{
public:
__event __interface _IATL7EVENTS;
HRESULT TestRaiseEvent()
{
CComSafeArray<long> Test;
SAFEARRAY *psa;
SAFEARRAYBOUND rgsabound[1];
rgsabound[0].lLbound = 0;
rgsabound[0].cElements = 10;
psa = SafeArrayCreate(VT_INT, 1, rgsabound);
long test;
test = 1234;
LPSAFEARRAY lpsa;
lpsa = psa;
__raise MyFirstEvent(psa);
return S_OK;
}
};
//compilation errors
//v:\ATL7TEST\ATL7TEST.cpp(33): error C2061: syntax error : identifier 'tagSAFEARRAY'
//v:\ATL7TEST\ATL7TEST.cpp(33): error C2059: syntax error : ')'
//v:\ATL7TEST\ATL7TEST.cpp(33): error C2143: syntax error : missing ')' before ';'
Forever Developing
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I am developing a COM dll that includes 3rd party dll in MFC 6.0. This 3rd party DLL reaches back into a java layer within itself via JNI(Java Native Interface). At my project level, I am getting
the following compile-time link time errors:
error LNK2001: unresolved external symbol "__declspec(dllimport) ?$S494@?1??IteratorClass@?$Iterator@VObservable@immaccs@@@util@@CAPAV_jclass@@XZ@4EA" (__imp_?$S494@?1??IteratorClass@?$Iterator@VObservable@immaccs@@@util@
@CAPAV_jclass@@XZ@4EA)
What is interesting is if I put the 3rd party stuff into a regular MFC exectuable project, the compile works fine. Projects are being compiled in release mode. Are there any known problems associated with a COM dll linking in another dll that has jni signatures in it?
Thank you for your time!
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How do I connect to the interface of a component, without importing the type library (dont want to include header either) ? Is there anyway I can get the information from the registry, given the fact that I know the prototypes for the methods present in that interface ?
Basically, I want to access a new component without changing my client app. (Again, the new component's interface methods are known).
Thanks
<marquee>. . . Humans do it better . . .
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Hello,
I'm an experienced programmer, but new to COM. I'd like to add a new option to the 'right-click' menu in internet explorer so rather than performing a 'save as' command I can send GIFs and JPEGs directly to an art program I've written. Is this possible? It seems possible, I just can't find the info I need.
thanks.
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From Microsoft:
http://msdn.microsoft.com/library/default.asp?url=/workshop/browser/hosting/wbcustomization.asp
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I am trying to get access to DataGrid control placed on a Dialog box but without using MFC enviroment (since the code I have is designed this way), and I wondered why the ActiveX DataGrid placed on a Dialog breaks in the callback where WM_INITDIALOG is never called. I needed this because it is the only way I know of to then initialize the DataGrid control with my recordset object.
Any pointers or suggestions?
Thanks--
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I have a task to do: I need to add virtual drive to the system that will display some virtual folders and files. Can somebody help me to start - how to create virtual drive?
Thank you in advance
Stas
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I'm writing a com component that has two interfaces that derive from IDispatch. When I compiled the project I got the error:
error C2594: 'static_cast' : ambiguous conversions from 'class CExplorerBar *' to 'struct IDispatch *'. So I changed the COM_INTERFACE_ENTRY to COM_INTERFACE_ENTRY2, so I could specify the IDispatch. Now I have 1 error and 3 warning (I'll just post the error):
c:\program files\microsoft visual studio\vc98\atl\include\atlcom.h(1827) : error C2259: 'CComObject<class cexplorerbar="">' : cannot instantiate abstract class due to following members:
c:\program files\microsoft visual studio\vc98\atl\include\atlcom.h(1823) : while compiling class-template member function 'long __stdcall ATL::CComCreator<class atl::ccomobject<class="" cexplorerbar=""> >::CreateInstance(void *,const struct _GUID
&,void ** )'.
Any ideas about what's going on?
Thanks.
Melinda.
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You cannot inherit from two interfaces derived from IDispatch, because the IDispatch is not a virtual base class ( as the error message is saying, the compiler cannot decide which base class to consider for casting).You can disambiguate the cast by specifying which base class to consider ( (IDispatch*)(IInterface1*)this).
Another issue is that you will have DISPID clashes from the two interfaces ( id 1 assigned to method "test" in iface 1, and for method "clone" for iface2). The solution is dispid encoding ( you can find an article on codeguru about this), manually implementing IDispatch or using tear-off objects.
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Hi All,
How do we handle dual LAN in DCOM.
Suppose I have two machines which are connected to two networks say network A & network B. Each machine has two IP addresses.
My Server is running on one machine & Client on another.
First of all when my Client makes a call to connect to the Server through which network will it get connected ? A or B ?
Moreover suppose the connection was established through network A. Now I want that when someone pulls out the network A LAN cable from Client's or Server's machine then the Client automatically gets connected to the Server through netwrok B.
Does DCOM has a solution for this ?
Please note that the Networks cards installed in the machines are normal cards. They do not form a team.
Best Regards,
Deepak
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You get to decide to which machine the client will connect, by specifying the remote server name in COSERVERINFO structure when calling CoCreateInstanceEx ( or by setting the appropriate value for RemoveServerName into the registry for the server component). DCOM does not have such failsafe mechanisms - if you cannot use the primary server anymore try to switch to the other one.
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