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I have added two functions to existing COM EXE which runs as Service.
But while calling those functions from another application I am getting unhandled exception like:
Unhandled exception at 0x00000000 in xxx.exe: 0xC0000005: Access violation.
Existing functions are getting called but only new functions are not working.
I have added functions to xxx.idl and implemented in another application by including the header generated after building.
I am trying to unregister old COM EXE but its not.
Please give me clue to sort out the issue.
I am new to COM, please let me know any further info is required to look in this issue.
Regards,
KTTransfer.
modified on Monday, November 2, 2009 5:26 AM
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You have to add this two functions to the end of your interface
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KTTransfer wrote: I have added two functions to existing COM EXE which runs as Service.
You are most likely breaking one important rule of COM: Interfaces are immutable. Once assigned an IID and published, no element of the interface definition may change..
Read more here[^].
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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Hi,
Does anyone know how to capture a users webcam video and send it to a publishing point on a server running windows media services ??
Phil.
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I guess you need a Directshow filter graph to do it. :
capture the video, compress then stream it using RTP ...
ActiveX - based solution...no I don't know. (Note that the solution does not need to render the flow locally, the issue is not dependent on some UI technology)
There is the Microsoft RTC (Real Time communication) that may interests you.
It implements SIP protocol so you may give it the address of a media relay point that in turn will broadcast the media data to its subscribers.
Good luck.
Easy Profiler : Now open source !
http://www.codeproject.com/KB/cpp/easyprofiler.aspx
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Hi,
I need to capture the whole desktop frame buffer, process it and then have it displayed again or streamed.
The first questions is really how do I capture the DWM final result of the composition as an image?
Do I need to go down level to the driver layer? OR is there any API that could help me with this?
How does VNC does the job? Can DWM help me directly on this?
If anyone could give me a tip here, that would be wonderfull.
Thanks,
With my best regards,
Nuno
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Wrong forum to post this question.
Anyway, desktop sharing tools like VNC are not very easy to implement.
Basically they split the screen into various sections and only stream the sections that have changed.
You can capture the entire screen using the API HDC hdc = ::CreateDC("DISPLAY", 0, 0, 0);
If hdc is saved to a file you can see the captured screen.
There could also be many other ways to do it.
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I have calling Initialize function with these parameters
Initialize(this->GetDC(),200,200);
Unhandled exception occurred at: m_pBitmap->CreateCompatibleBitmap(pInputDC,width,height);
void Initialize(CDC* pInputDC,int width, int height)
{
CDC *m_pDC;
CBitmap* m_pBitmap;
m_pDC->CreateCompatibleDC(pInputDC);
m_pBitmap->CreateCompatibleBitmap(pInputDC, width, height);
m_pDC->SelectObject(m_pBitmap);
m_pDC->Rectangle(0,0,width,height);
}
This is shown in call stack when exception occurred:
mfc80ud.dll!CGdiObject::Attach(void * hObject=0xb90510f0) Line 1157 + 0x3 bytes
mfc80ud.dll!CBitmap::CreateCompatibleBitmap(CDC * pDC=0x004bf954, int nWidth=336, int nHeight=189) Line 251 + 0x25 bytes
AxGraph.ocx!CGraphCtrl::Initialize(CDC * pInputDC=0x004bf954, int width=336, int height=189) Line 27
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What kind of exception is fired? Access Violation or something with more information?
And this->GetDC() is the DC of your window?
Greetings
Covean
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m_pDC and m_pBitmap are not initialized.
Try
CDC *m_pDC = new CDC();
CBitmap* m_pBitmap = new CBitmap();
m_pDC->CreateCompatibleDC(pInputDC);
m_pBitmap->CreateCompatibleBitmap(pInputDC, width, height);
m_pDC->SelectObject(m_pBitmap);
m_pDC->Rectangle(0,0,width,height);
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Hi:
I'm new to Windows COM programming. I was able to make a 64-bit app call a 32-bit COM server (out-of-process, exe) on 64-bit Vista, but not the other way around, the CoCreateInstance call in my 32-bit app failed with a return code 0x80029C4A (error loading type library/DLL).
Can this be done at all? Basically I just need the 32-bit app to send some request to the 64-bit server, and wait for the request to finish. The server should be able to send back a status code indicating whether there is any error.
Appreciate any help and suggestions.
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You have to create (without /Oicf tag) and register 2 proxy/stubs dlls
First 64 bit and another one 32 bit
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Looking for an easy way or infact any way to pop event for unmanaged code via csharp com interop wrapper.....
Any one knows a good site for c# COM technologies? I have a serious trouble with this issue....
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I have to register a type library so I need regtlib or regtlibv12 but they are not on my Vista system? Is there a replacement for them or do I need to find a dodgy download site?
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I'm not sure if I'm posting in the correct forum, this is regarding late binding on a custom DLL in C#.
Basically, I have a self-written DLL which I wrapped using TLBIMP.exe.
Now I am trying to map the DLL's events to that of my own form. The events inside the DLL originate from a class.
I have tried almost every solution I was able to Google and nothing works.
Please do not reply to my thread if you have just Googled a solution, I need to hear from someone who has done this before. I've tried Google.
Details:
O.k, I'm going to use simpler names than that of my actual code.
My DLL file is called wrapper_MyDLL.dll and I load it as follows:
System.Reflection.Assembly _assembly = Assembly.LoadFile("wrapper_MyDLL.dll");
I save the Type as follows:
System.Type _classType = _assembly.GetType("wrapper_MyDLL.MyModuleClass");
I save the Class Object as follows:
object _classObject = Activator.CreateInstance(_classType);
Now from this point on I have tried so many different pieces of code to get the event that I'd rather not try to provide my attempted solution.
However, I can give some detail about my DLL.
If I loop through _assembly.getTypes() I get (among other) the following two classes:
* wrapper_MyDLL.MyModuleClass
* wrapper_MyDLL.__MyModule_ReceivedMessageEventHandler
Inside the class wrapper_MyDLL.MyModuleClass, the DLL exposes the following (among other):
Methods:
* add_ReceivedMessage
* remove_ReceivedMessage
Event(s):
* ReceivedMessage
Inside the class wrapper_MyDLL.__MyModule_ReceivedMessageEventHandler, the DLL exposes the following (among other):
Methods:
* get_Method
* get_Target
Properties:
* Method
* Target
Now, how do I go about having that event (ReceivedMessage) fire in a method in my C# project?
If you think you can help and need any more info, let me know. 
Kind Regards
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Hi all,
I'using COM and the IWebbrowser interface in a non MFC C++ application to have a preview on MS Office documents (doc, docx, xls, ...) in a frame of my application. Works quite fine, but I'm facing two problems, which I was not able to solve yet (though working on it for 2 weeks... ).
1. I have installed IE8 and MS Office 2007. When I'm showing a Word file (.doc), then all the Word toolbars are shown and active. When I'm showing an Excel file (.xls) with the same Navigate command, all the Excel toolbars are hidden. I want these toolbars generally to be hidden. I've tried several things with the "FullScreen", "TheaterMode" and "Toolbar" commands, but these things don't seem to work with this interface !?
I have also tried the OLE command ExecWB with w->iexp->ExecWB(OLECMDID_HIDETOOLBARS, OLECMDEXECOPT_DODEFAULT, NULL, NULL);
This works fine, but unfortunately this is a toggle command. So I may only execute this command, if the toolbars are already shown, but I found no way to determine whether the toolbars are already shown.
Of course, I could check if I'm showing a Word file, and only then I will hide the toolbars. But I really don't like this extension depending behaviour. So does anyone have an idea to generally hide these toolbars? Or is there a possibility to change some flags in MS Word and MS Excel?
2. Is there a possibility to get to know whether a Word document is modified in my application frame? The problem is: Someone could write something to the Word file in my application window. If he then just closes the window, these modifications are lost. The "normal" MS office dialog, which asks whether you want to save your modifications or not, or just cancel, is not coming, while closing the window. I guess my window is already destroyed before this dialog has a chance to come, so I have to show my own dialog for asking before the window is destroyed. And therefore I need to know if the file has been modified.
I have already installed an event listener via the connection points technique to get the WebBrowserEvents, but I didn't find an event which is good for my needs.
Does anyone have an idea?
Thanks in advance
Alex
P.S. I'm a newbie to these COM things, so please be patient with me 
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IWebBrowser interface notifies the window some events, such as DocumentComplete, NavigateComplete, BeforeNavigate, DownloadComplete etc. 'DocumentComplete' will be notified when a document is completely loaded into browser. Then you can get a IDispatch pointer to the loaded document by calling IWebBrowser::get_Documet(). In the case of Word, you will get IDispatch pointer to the _Document interface of Object Model of MS Word Application. See Object Model of MS Word by opening it's type library (MSWORD.OLB) using OLEView.exe tool of Visual Studio. _Document has methods put_Saved() & get_Saved(). You can create wrapper classes for the required interfaces of that Object model.
following is the rough code..
IDispatch *pDsip = 0;
IWebBrowser::get_Document(&pDisp);
_Document wordDoc(pDisp); //_Document is the wrapper for _Document interface
if(!wordDoc.get_Saved())
{
//Message here..
//Call wordDoc.Save to save document
}
Investigate on Word interfaces to do something to hide tool bar.. Its possible.
Hope this will help u..
--Cool_Dev--
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I have an interface, I1 declared in library A, another interface I2 in library B. I2 has a property whose type is I1.
Now I want to use I2 in project A, so I "#import 'B.tlb' rename_namespace('B'), named_guids", then compile failed with error C4772, for interface I1 that in B.tlh can not be indentified. How to resolve this problem?
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Use the auto_search[^] attribute on #import to automatically perform a #import of things B references.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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Thanks for your suggestion, but it does not work. Because I have not write code using I2, if I comment the import clause, project A can be compiled well. But if I add import clause, compiled with error C4772.
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Ah, I see - hadn't noticed the circular dependency...
Have you tried #including the .h file generated from project A's IDL file before the #import - because that's all you need really - a definition of I1 before the #import statement.
You may need to play with #import attributes to get the namespaces correct, but that's about all you should need.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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I'm working on a shell extension that will:
1. add an item to the context menu from a right click in the background of a folder in explorer (not a right click ON a folder)
2. add an item to the context menu from a right click on an exe file
First question is... can I do this with ONE shell extension or does it have to be two separate modules? I'm really hoping I can do it all at once.
Secondly, I'm wondering what the best way to "package" a shell extension is (for easy installation later). Right now the DLL is being accessed from my project folder but that is just a temporary solution. I need to install it somewhere....where should it live and what's the best way to get it there? Should I create an installer of some sort?
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You could do that with one or two extensions. IShellExtInit::Initialize() is called with different parameters when you click on a file versus the background, so you can tell those two cases apart. Check out part 1[^] and part 7[^] of my shell extension series for more details.
Having two extensions doesn't mean you need two DLLs. Each extension is just a coclass, and there's nothing preventing you from having multiple coclasses in one DLL.
--Mike--
Dunder-Mifflin, this is Pam
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