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Automation generally implies you are supporting non C++ clients. Once you move beyond C++ clients, VB is by far the next most sophisticated consumer of COM objects. VB cannot use UNION types (other than the special case of a VARIANT type) and neither can any other type of Automation client (i.e. scripting languages). No point in creating an interface that no Automation clients can use.
You could create two methods, or you could pass both parameters as Optional.
Robert
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Hi, Can somebody give me a sample or pointer on how to establish a virtual com port for Bluetooth USB dongle?
Thanks in adavance.
TW
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I'm integrating a newly created COM component into an existing GUI. When the program returns from the following implicit call, the PIUnknown pointer gets set to zero and the program subsequently fails. I have no clue what's happening and I can't step into the function to see. Any Ideas would be greatly appreciated.
mark
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MDowning wrote:
I'm integrating a newly created COM component into an existing GUI. When the program returns from the following implicit call, the PIUnknown pointer gets set to zero and the program subsequently fails. I have no clue what's happening and I can't step into the function to see. Any Ideas would be greatly appreciated.
Here is the function call:
hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown));
thanks, mark
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Shouldn't that be:
hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown));
or did you not turn off HTML tags?
Have you verified that your pointer to the outer object is valid?
Robert
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So what's the value of hr? CoCreateInstance reports the reason for a failure.
You do occasionally get badly-implemented COM components which return a success code when asked for their primary interface, but fail (returning E_NOINTERFACE) when asked for IUnknown. This is of course an implementation error - all components must implement IUnknown.
Stability. What an interesting concept. -- Chris Maunder
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Are you calling CoInitialize(NULL)?
ed
~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
-Frank Outlaw.
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Hello,
i try to use late binding for office automation with powerpoint and c#.
I found some examples for word which work fine:
<br />
Type comType;<br />
object comObject;<br />
<br />
comType = Type.GetTypeFromProgID("Word.Application"); <br />
comObject = Activator.CreateInstance(comType);<br />
<br />
object o = comType.InvokeMember("Application", BindingFlags.Public | BindingFlags.GetProperty, null, oPptAppObject, null);<br />
...<br />
...<br />
So far everything works fine. The Compiler is happy 
But when i replace the ...("Word.Application")... with ...("PowerPoint.Application")...
i get an exception (which says: unknown name) for line with:
object o = comType.InvokeMember.....
Also "Application" is a Member of PowerPoint, like it is in Word.
I also tried other Members from PowerPoint but was not lucky.
I googled the whole day, but no solution.
Can anybody help me please?
It have no idea what to do.
Thanks a lot!
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"Word.Application" is the ProgID, it doesn't mean access the "Application" member of "Word".
I don't have PowerPoint installed on my computer, just the Viewer. I would use "PowerPointView.Application" to instansiate the viewer.
Do you have PowerPoint installed on your computer?
PeterRitchie.com
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In *.idl file:
interface Ixxxx : IDispatch
{
[id(1), helpstring("method GetData")] HRESULT GetData(LPCTSTR Key, DWORD *Data);
[id(2), helpstring("method SetData")] HRESULT SetData(LPCTSTR Key, const DWORD Data);
};Both these methods generate warning MIDL2039 : interface does not conform to [oleautomation] attribute : [ Parameter 'Key' of Procedure 'GetData' ( Interface 'Ixxxx') ]. Other than these warnings the interface seems to run correctly. Is it something I have to worry about or can I safely ignore them. If I have to worry about it, how do I go about fixing it? All MSDN says is make sure the interface is derived from IUnknown or IDispatch.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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Classes marked as "dual" have implied oleautomation attribute.
The oleautomation attribute simply means that the interface is compatible with older versions of Visual Basic, VBScript, JavaScript, etc. (i.e. untyped scripting languages).
If you don't need your interface to be compatible with any of those, then you can ignore the warning.
If you need to be compatible, you can get rid of the error by replaycing LPCTSTR with BSTR.
PeterRitchie.com
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Thanks, I don't need them to be compatible (so far  ) but I hate getting warnings in my code, makes me nervous that I am doing something wrong. I changed the LPCTSTRs to const BSTRs and all is well.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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How Can I catch Key Event When I have focus on Webbrowser object in my application?There are a lot of articles about context menu etc, but no one has said anything about catching Key Event. Is there some solution by using some API or?
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Hi BorisKco,
You encounter to the infamous problem with WebBrowser control.
There r some work arounds for this problem.
BTW, wht r u exactally looking at ?
Cheers,
Vishal
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I have solved the problem already. But, thanks anyway.
Boris
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requirements minimum to install an application developed in C #using COM+ [. NET] in a computer with WIN98?
lang
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hello..
I have finished an application developed in C #using COM+ and I have the following errror:
at System.EnterpriseServices.ServicedComponentProxy.CleanupQueues(Boolean bGit)
at System.EnterpriseServices.ServicedComponentProxyAttribute.CreateInstance(Type serverType)
at System.Runtime.Remoting.Activation.ActivationServices.IsCurrentContextOK(Type serverType, Object[] props, Boolean bNewObj)
at WinInterface.Login.btnAceptar_Click(Object sender, EventArgs e)
The type initializer for "System.EnterpriseServices.ServicedComponentProxy" threw an exception.
The application has been created in WINXP and will settle in WIN98SE.
Code Sample ... All BusinessLogic.
[Guid("35D02EB6-BC99-4c57-8078-1CF58CFE1FE7"),
JustInTimeActivation(),
Synchronization(SynchronizationOption.Required),
Transaction(TransactionOption.Required)]
public class ClienteBL : ServicedComponent
Help me ... please
lang
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I have a minimal C# project with a form containing a AxSHDocVw.AxWebBrowser. The project also contains a UserControl that has been given a GUID to act as an ActiveX-compnent. The UserControl has its backgroup color set (yellow) but besides that it does "nothing".
During execution the HTML code: "<html><body><object classid=\"clsid:#GUID#\"></object></body></html>"
is loaded into the AxWebBrowser and the yellow UserControl is shown.
The problem occurs after Dispose. When the form is closed it's Dispose method is called and the application freezes.
The stack trace tells me that the execution has stopped in system.windows.forms.dll!System.Windows.Forms.Control.ActiveXImpl.SetClientSite
If I explicitly call AxWebBrowser.Dispose() the application freezes at that line of code.
If I omit the ActiveX from the HTML the problem does not occur.
Any suggestions?
Thanks in advance
/Dan
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I am using an IHTMLDocument class to sent text information to the printer in HTML format. One problem I have encountered is that I want to send many HTML documents in one go. There is no HTML tag for "page break" so I must send each document as a different print job. If I'm doing this the print dialog box will be thrown up 20 times (being a real pain for the user).
I know that the flag PRINT_DONTBOTHERUSER can be set to stop the dialog being activated but there is next to no info on Google and MSDN is really unhelpful. Has anyone with experience in COM done this before? Is there any example code you could demonstrate?
For info, here is the code I am using to perform the print job:
// includes for COM stuff
#include <comdef.h>
#include <mshtml.h>
#pragma warning(disable : 4146) // see Q231931 - MSDN
#import <mshtml.tlb> no_auto_exclude
// end of COM stuff
......
bool CSomeClass::PrintHTMLNotes(void)
{
// get IHTMLDocument handle
MSHTML::IHTMLDocument2Ptr pDoc;
HRESULT hr = CoCreateInstance(CLSID_HTMLDocument, NULL, CLSCTX_INPROC_SERVER,
IID_IHTMLDocument2, (void**)&pDoc);
if (pDoc==NULL)
return false;
// convert string to safearray
SAFEARRAY* psa = SafeArrayCreateVector(VT_VARIANT,0,1);
VARIANT *param;
hr = SafeArrayAccessData(psa,(LPVOID*)¶m);
param->vt = VT_BSTR;
SAFEARRAY* psaIn = SafeArrayCreateVector(VT_VARIANT,0,1);
VARIANT *pvaIn;
hr = SafeArrayAccessData(psaIn,(LPVOID*)&pvaIn);
pvaIn->vt = VT_ARRAY;
pvaIn->iVal = PRINT_DONTBOTHERUSER;
// write data to document
bstr_t bsData;
for (int i=0; i<m_ncurrentnote; i++)
="" {
="" bsdata="m_csaNotes[i];
" param-="">bstrVal = (BSTR)bsData;
hr = pDoc->write(psa); // write buffer
}
hr = pDoc->close(); // close document (applys code)
SafeArrayDestroy(psa); // clean up
// print the file
CComQIPtr<iolecommandtarget> spTarget = pDoc;
if (spTarget != NULL)
spTarget->Exec(NULL, OLECMDID_PRINT, 0, pvaIn, NULL);
else
return false;
return true;
}
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If you have control over the HTML you can add page breaks to it. I'd have to find the code but if you do let me know.
ed
~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
-Frank Outlaw.
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Hi!
I have a COM Class (say MyCOMClass). I'm able to create an object in Access and call its methods. The problem is that the COM object throws events, and i don't know how to handle them.
For example in VB.NET i have
Dim WithEvents myCOMObject as New MyCOMClass
Then, i can catch the events that myCOMObject throws easily. But I have try to do the same in VB for Applications and i can't use WithEvents. So, is there another way?
I'm not a VB programmer, I'm just doing some testing applications for my COM project.
Thanks for the help.
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VBA supports WithEvents. You cannot use it in a standard module but you can declare an object WithEvents in a form or a class in MS Access (or any VBA project).
You cannot use WithEvents with the new keyword.
Suppose you have a form in Access.
In the code behind the form add:
Private WithEvents myCOMObject As MyCOMClass
In the Form_Load procedure add:
Set myCOMObject = New MyCOMClass
Presto. Events.
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Happy Friday! Gurus,
I am trying to use the logics from Intel OpenCV DLLs, which were originally compiled by MSVC++ 6. From C# or ASP.NET Apps, when I was trying to add reference to these DLLs (i.e. cv096.dll or cxcore096.dll), I got this error:
“A reference to ‘D:\Programs\OpenCV\bin\cv096.dll’ could not be added. This is not a valid assembly or COM component. Only assemblies with extension ‘dll’ and COM components can be referenced. Please make sure it is a valid assembly or COM component.”
Note: The source code of Intel OpenCV DLLs is open source. I can open this source code project in either MSVC++ 6 or VS.NET 2003.
Question: How can I use these DLLs in .NET environment, preferably in ASP.NET and C# projects?
Thanks with a million
Khang
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That means it is a standard C/C++ DLL, not a COM Dll. You cannot add a reference to the DLL and use it directly like a COM component.
That means you'll have to use API style declarations to access whatever functions the dlls export. You'll also have to figure out how to translate all the unmanaged types into C# compatible types. I'd start looking for a OpenCV user group if I were you.
Robert
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