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im making a program that has a button on the dialog. When pressed, it pops up another dialog.It is a math calculator program. This specific button calculates square root. I need to have the thing go in a child window(modal dialog) because i have other formula buttons to add...
So i go in the class wizard, create a dialog of the CDIALOG BASE ....then i try to add a message handel.....
then on my main dialog, i add the code
CDialog aboutDlg(IDD_ABOUTBOX);
// Create and show the dialog box
INT_PTR nRet = -1;
nRet = aboutDlg.DoModal();
// Handle the return value from DoModal
switch ( nRet )
{
case -1:
AfxMessageBox("Dialog box could not be created!");
break;
case IDABORT:
// Do something
break;
case ID_SOMETHING:
MessageBox("hello", "bonjour(s)", MB_OK);
break;
case IDCANCEL:
// Do something
break;
default:
// Do something
break;
};
i know DOMODAL IS RESTRICTED in a few perimters but someone told me to create a class and make message handles...than override domodal with my code...nothing happens....message box does not appear
....i just lost though..nothing is working at all..please give me detials or a tutorial on how to create a class derived from CDIALOG than add message handles.
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in that case can you give code of your DOMODAL function?
if you want a simple work around then you can store that square root value in some global or class variable and then use it in parent dialog. But if you want to go with domodal then share that code.
Thanks.
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The code you've shown has little, if anything, to do with the question you've asked.
acce55 wrote: please give me detials or a tutorial on how to create a class derived from CDIALOG...
If you have already designed the dialog template, open ClassWizard (Ctrl+W). It should prompt you for creating a class or selecting an existing class. Selecting the former should bring up a New Class dialog with the Base class and Dialog ID already filled in.
The steps in VS200x are different. I do not have that version in front of me to provide details."One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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Hello,
I have downloaded the last 0.2.8version of log4cpp from source forge, but I have to build the sources because they dont provide the binaries.
There's a MSVC6 folder in the distrib, but I only have visual studio .net 2003 (VC7).
I tried to build it anyway, but ran into build errors. I would appreciate if someone can help here..
This is what I did:
1. start msvs.net 2003.
2. File->Open project->...->log4cpp-0.2.8->msvc6->msv6.dsw
3. I got the following msg box:
"The project 'log4cpp.dsp' must be converted to the current Visual C++ project format. After it has been converted, you will not be able to edit this project in previous versions of Visual Studio."
4. I said "yes to All"
5. Build->build log4cpp
6. This is the o/p from log file:
log4cpp-0.2.8\src\PatternLayout.cpp(134): error C2593: 'operator <<' is ambiguous
log4cpp-0.2.8\src\OstringStream.cpp(78): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)
7. line 134 of PatterLayout.cpp is: message << t;
8. Line 78 of Ostring.cpp is :
*this << vstrprintf(format, args);
Any help?
Thanks a lot.
-R
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| The C2679 error message makes it sound to me like you need to add in a #include of <string> - VC6 implicitly included that header when you included iostream, whereas VC2003 doesn't, IIRC. Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
CodeProject MVP for 2010 - who'd'a thunk it!
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Well the reversed class looks something like it:
struct random_class {
char *something;
void __thiscall classfunction (void *this);
};
So i wanna hook it like this
void (__thiscall* classfunction)(void *this );
void __thiscall myclassfunction(void *this )
{
return classfunction(this->something);
}
But i get 8 errors it says syntax error : missing ';' before 'this' Did i use it correctly or wrongly i didnt find on google any function that uses param as void*this???
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Try calling your parameter sonething other than "this". this has a special meaning (meaning: a pointer to this object) in C++.
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hi
I don't understand Completely what you say,but the word "this" is the key word of C/C++. so it isn't declare as a variable. as follow,there is a example.I hope it is help for you.
#include "stdafx.h"
typedef void classfunction (void *w);
struct random_class {
char *something;
classfunction *myfunction;
};
classfunction * myclassfunction(void *w )
{
return ((struct random_class *)w)->myfunction;
}
void printfAint(void *w)
{
printf("%d\n",*(int*)w);
}
int main(int argc, char* argv[])
{
int i=10,j=20;
random_class r;
r.myfunction=printfAint;
r.myfunction(&i);
r.myfunction(&j);
return 0;
}
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zhq00001 wrote: the word "this" is the key word of C/C++. so it isn't declare as a variable
In your first example it is, its declared as a parameter which is a variable:
void (__thiscall* classfunction)(void *this );
void __thiscall myclassfunction(void *this )
{
return classfunction(this->something);
}
I'm saying try changing it to:
void (__thiscall* classfunction)(void *pParam );
void __thiscall myclassfunction(void *pParam )
{
return classfunction(pParam->something);
}
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The calling convention __thiscall[^] is for member functions. You can't apply it to regular global functions as you're attempting. Also, for member functions __thiscall is assumed and in general including it adds little but clutter.Steve
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Im trying to return the char using the thispointer.
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I created a dialog-based MFC application in VS6, and added a simple ATL object to it using the ATL Object Wizard (this creates several .c and .h files, and adds a lot of code to the app class). In the .h file that it created, I added public IWMPEvents to the class declaration. I also added COM_INTERFACE_ENTRY(IWMPEvents) to the BEGIN_COM_MAP macro. I then implemented the 45 or so methods of IWMPEvents. At this point the compiler and linker are happy. Now for the problem...
In the code where I actually want to use this new ATL object, I have:
CMyEventHandler *pEventListener = NULL;
CMyEventHandler::CreateInstance(&pEventListener); <<--- error
CComPtr<IWMPEvents> spEventListener = pEventListener;
connectionPoint->Advise(spEventListener, &dwAdviseCookie); The error is:
atlcom.h(3173) : error C2787: 'CMyEventHandler' : no GUID has been associated with this object
I've tried all I can think of but nothing is working. I've successfully compiled the wmphost project that comes with the Windows Media SDK, but cannot find any meaningful differences other than it does not use MFC.
What am I overlooking?
- DC"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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It's been ages since I played with this, but do you need to add an entry into the project .idl file defining a GUID for coclass or interface there?
Is there even an idl file for this project type?L u n a t i c F r i n g e
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Yes a .idl file was created and it has a GUID in it for the IMyEventHandler interface."One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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DavidCrow wrote: a .idl file was created and it has a GUID in it for the IMyEventHandler interface.
David, I don't get exactly what you're trying to do.
It seems like you're trying to create COM server and register something else that you have developed (CMyEventHandler?) for receiving COM events. Right?
What I'm trying to figure out is why you're trying to create an instance of your CMyEventhandler...
Is it really a COM server? If so, from where is it created and does the header files created have a CLSID for it?
Usually you would create a COM server with e.g. ::CoCreateInstance(), or one of its equivalents. You provide the CLSID for the server, the IID for the desired interface and a pointer to store the interface pointer in if the call was successful.
If the server produces COM events that the client is interested in, the client uses a mechanism in the server to register itself as an event listener (Advise()?).
From your explanation I don't see the above happening, a part from calling CreateInstance but for what looks to me as the "wrong" object.
Can you elaborate on this a bit further David?
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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Roger Stoltz wrote: David, I don't get exactly what you're trying to do.
It seems like you're trying to create COM server and register something else that you have developed (CMyEventHandler?) for receiving COM events. Right?
My overall intent is to open a .mp3 file using the Windows Media Player COM object, and then read some information from one of the headers. I can't get this information until the player has loaded the .mp3 file. A side effect of loading the .mp3 file is that it will start playing it. To get around this, I need to respond to the 'play' event and stop it. That's what got me to looking at the IWMPEvents interface.
Roger Stoltz wrote: What I'm trying to figure out is why you're trying to create an instance of your CMyEventhandler...
Is it really a COM server? If so, from where is it created and does the header files created have a CLSID for it?
Usually you would create a COM server with e.g. ::CoCreateInstance(), or one of its equivalents. You provide the CLSID for the server, the IID for the desired interface and a pointer to store the interface pointer in if the call was successful.
If the server produces COM events that the client is interested in, the client uses a mechanism in the server to register itself as an event listener (Advise()?).
From your explanation I don't see the above happening, a part from calling CreateInstance but for what looks to me as the "wrong" object.
Can you elaborate on this a bit further David?
Good questions. As I've done very little with COM, some of the terms and procedures are still a mystery. Other pieces of my code look like:
CComPtr<IWMPPlayer4> player;
HRESULT hr = player.CoCreateInstance(__uuidof(WindowsMediaPlayer), 0, CLSCTX_INPROC_SERVER);
CComPtr<IConnectionPoint> connectionPoint;
CComPtr<IConnectionPointContainer> connectionContainer;
player->QueryInterface(&connectionContainer);
connectionContainer->FindConnectionPoint(__uuidof(IWMPEvents), &connectionPoint); "One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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DavidCrow wrote: My overall intent is to open a .mp3 file using the Windows Media Player COM object, and then read some information from one of the headers.
Perhaps this is not what you'd like to hear/read, but wouldn't it suffice to read the mp3 file from your application if you're only interested in the header?
I guess you've thought about this alternative already and discarded it.
If not, you may find this[^] or this[^] useful.
I don't know what header information you're looking for.
More about the Media Player solution...
Have you had a look at this article[^] about handling Media Player events in C++?
Provided that you successfully can create the Media Player server, you should be able to find something in the article above that you can use.
You should also have a look at the ATL sample that demonstrates connection points: ATLDuck.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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Roger Stoltz wrote: Have you had a look at this article[^] about handling Media Player events in C++?
Yes, several times.
Roger Stoltz wrote: Provided that you successfully can create the Media Player server, you should be able to find something in the article above that you can use.
I can play the .mp3 file just fine. I can also change other settings (e.g., auto start). It's just getting past the "no GUID specified" compiler error that's troubling me."One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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DavidCrow wrote: It's just getting notified of events that's troubling me.
Okay...
Basically this is what you have to do:
- Implement a class that derives from the event interface you're interested in and put the interface in the COM_MAP. As I understand it you've already done this part.
- When you've successfully created the Media Player server and got an interface pointer (
IWMPPlayer), you create an instance of the class mentioned above; not by using CreateInstance(), use new or similar (you know what I mean). - Ask
IWMPPlayer for the IConnectionPointContainer interface as described in the article. - Find the connection point you want,
IWMPEvents, by calling IConnectionPointContainer::FindConnectionPoint() and you should get an IConnectionPoint interface in return as described in the article. - Register your class as an event listener by calling
IConnectionPoint::Advise() and provide a pointer to your instance of your CMyEventHandler. Store the cookie and the IConnectionPoint interface pointer as you'll need it when you unregister from the server. - You should be all set to catch events from Media Player!
- Remember to call
IConnectionPoint::Unadvise() when you're done.
The ATLDuck sample[^] explains how to set up connection point further. It gives you a complete working example and not just some code snippets.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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It appears that I have steps 1-5 in place. Do you agree?
Does the duck sample talk about how to avoid the GUID error that I'm battling?"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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DavidCrow wrote: It appears that I have steps 1-5 in place. Do you agree?
Nope, I don't agree.
Not unless you've altered the code you presented earlier where you tried to create an instance of CMyEventHandler by calling CreateInstance() into what I suggested, e.g. using new.
DavidCrow wrote: Does the duck sample talk about how to avoid the GUID error that I'm battling?
Nope.
The question is irrelevant as a CLSID for CMyEventHandler won't be needed when you create a CMyEventHandler on the heap or the stack.
Note that what the compiler complains about is a missing "Class ID", CLSID, since it refers to the 'object' CMyEventHandler. The CLSID is the identity of the server one is trying to create with a call to CreateInstance(). This is not the same as the identity of the interface you're trying to use called "Interface ID" or IID, which also has a Globally Unique IDentifier assigned to it.
Your CMyEventHandler declaration should look something like this:
class ATL_NO_VTABLE CMyEventHandler :
public CComObjectRootEx<CComSingleThreadModel>,
public IWMPEvents
{
public:
BEGIN_COM_MAP( CMyEventHandler )
COM_INTERFACE_ENTRY(IWMPEvents)
END_COM_MAP()
public:
};
The code where you create the Media Player server should look something like this, as partially described in the article:
CComPtr<IWMPPlayer> spWMPPlayer;
CComPtr<IConnectionPoint> spConnectionPoint;
DWORD dwAdviseCookie;
HRESULT hr;
CMyEventHandler* pMyEventHandler = new CComObject<CMyEventHandler>;
CComQIPtr<IConnectionPointContainer, &__uuidof(IConnectionPointContainer)> spConnectionContainer( spWMPPlayer );
if( spConnectionContainer )
{
hr = spConnectionContainer->FindConnectionPoint( __uuidof(IWMPEvents), &spConnectionPoint )
if( pMyEventHandler && SUCCEEDED( hr ) )
{
hr = spConnectionPoint->Advise( (IUnknown*)pMyEventHandler, &dwAdviseCookie );
}
}
Finally, a little tip... 
You could declare CMyEventHandler as a nested class inside the class from which you're creating the Media Player server. That would make it easier to call functions in the outer class from the event handlers. You could provide the 'this'-pointer to the constructor of the CMyEventHandler class and store it internally. Creation of the CMyEventHandler would of course look like this:
CMyEventHandler* pMyEventHandler = new CComObject<CMyEventHandler>( this );
I suppose you have to declare the nested CMyEventHandler class as a friend to the outer class if you don't feel like exposing the callbacks publicly.
From a design point of view I like this way of writing a COM event sink.
I hope you'll find the above helpful.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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Roger Stoltz wrote: I hope you'll find the above helpful.
Yes, the compiler is happy now. It's still a tad confusing, however, since the two examples I was using as a reference were calling CreateInstance().
Upon running the code, Advise() is returning 0x80040202 (CONNECT_E_CANNOTCONNECT). MSDN article Q183216 talks about my sink object (CMyEventHandler) may be missing something that QueryInterface() is looking for. As far as I can tell, my sink object has implemented all of the IWMPEvents methods."One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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DavidCrow wrote: MSDN article Q183216 talks about my sink object (CMyEventHandler) may be missing something that QueryInterface() is looking for. As far as I can tell, my sink object has implemented all of the IWMPEvents methods.
The article Q183216 is talking about when the server is querying for the source interface, IWMPEvents in your case, and the client who is supposed to implement the interface responds with an error that says the interface is not supported/implemented. The error returned to the server is most likely E_NOINTERFACE.
For this to be applicable in your situation you must have forgotten to put the entry in the COM_MAP, but as I understand from your previous posts you've already got that in place.
This made me wonder if the server might be requesting another interface such as IDispatch, e.g. if the IWMPEvents inherits from IDispatch, but as far as I can tell with the OLEView tool this is not the case.
Can you successfully "find" the connection point with IConnectionPointContainer::FindConnectionPoint()?
Are you possibly making the call from a worker thread? If you are, does it work if you try to do this from your main thread?
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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Roger Stoltz wrote: The error returned to the server is most likely E_NOINTERFACE.
Which is 0x8004002. The error that I am getting is 0x80040202.
Roger Stoltz wrote: For this to be applicable in your situation you must have forgotten to put the entry in the COM_MAP, but as I understand from your previous posts you've already got that in place.
This made me wonder if the server might be requesting another interface such as IDispatch, e.g. if the IWMPEvents inherits from IDispatch, but as far as I can tell with the OLEView tool this is not the case.
class ATL_NO_VTABLE CMyEventHandler :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CMyEventHandler, &CLSID_MyEventHandler>,
public IDispatchImpl<IMyEventHandler, &IID_IMyEventHandler, &LIBID_MusicTestLib>,
public IWMPEvents
{
public:
CMyEventHandler() {}
DECLARE_REGISTRY_RESOURCEID(IDR_MYEVENTHANDLER)
DECLARE_PROTECT_FINAL_CONSTRUCT()
BEGIN_COM_MAP(CMyEventHandler)
COM_INTERFACE_ENTRY(IMyEventHandler)
COM_INTERFACE_ENTRY(IDispatch)
COM_INTERFACE_ENTRY(IWMPEvents)
END_COM_MAP()
...
};
Roger Stoltz wrote: Can you successfully "find" the connection point with IConnectionPointContainer::FindConnectionPoint()?
QueryInterface() and FindConnectionPoint() both return S_OK.
Roger Stoltz wrote: Are you possibly making the call from a worker thread? If you are, does it work if you try to do this from your main thread?
No additional threads have been created.
My call to Advise() differs from yours in how I had to cast the first argument:
hr = connectionPoint->Advise((IWMPEvents *) pEventHandler, &dwAdviseCookie); Casting it to IUnknown* yielded:
error C2594: 'type cast' : ambiguous conversions from 'class CMyEventHandler *' to 'struct IUnknown *'"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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DavidCrow wrote: Roger Stoltz wrote:
The error returned to the server is most likely E_NOINTERFACE.
Which is 0x8004002. The error that I am getting is 0x80040202.
Well, you're not the server which means that what I'm talking about is the error message your client is sending the Media Player when the Media Player server asks for your implementation of the IWMPEvents source interface.
David, now I'm just guessing, but I get the impression that you've misinterpreted some part of what I've been trying to explain and I cannot really figure out what part...
Most likely I haven't been very clear on the subject so let me try again.
It looks like you've opted for my suggestion based on a nested class to use as an event sink, otherwise I don't understand your pEventHandler variable as it should be this in the call to Advise(). Whatever pEventHandler points to doesn't seem to expose the IWMPEvents interface judging from the error you got.
If you are using the nested class version you should remove the IWMPEvents entry from the COM_MAP in the outer class and put it into the presumably non-existing COM_MAP of the inner/nested class. You can think of the COM_MAP as being traversed when QueryInterface() is called on your object.
I don't understand why you're exposing the IMyEventHandler and IDispatch interfaces from your class. Perhaps you did it intentionally or it could be a misunderstanding. Who is going to use those interfaces? If you're not trying to develop a COM server yourself that exposes e.g. IMyEventHandler, then I guess it shouldn't be there in the first place.
However, now that you've provided an important part of your class declaration I can try and patch together a declaration based on the nested class scenario for you. I hope things will clear up afterwards.
It should look something like this:
class ATL_NO_VTABLE CMyEventHandler :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CMyEventHandler, &CLSID_MyEventHandler>,
public IDispatchImpl,
{
public:
CMyEventHandler() {}
DECLARE_REGISTRY_RESOURCEID(IDR_MYEVENTHANDLER)
DECLARE_PROTECT_FINAL_CONSTRUCT()
BEGIN_COM_MAP(CMyEventHandler)
COM_INTERFACE_ENTRY(IMyEventHandler)
COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()
protected:
class ATL_NO_VTABLE CMyEventSink :
public CComObjectRootEx<CComSingleThreadModel>,
public IWMPEvents
{
public:
CMyEventSink( CMyEventHandler* pParent = NULL ) { m_pParent = pParent; }
BEGIN_COM_MAP( CMyEventSink )
COM_INTERFACE_ENTRY(IWMPEvents)
END_COM_MAP()
public:
STDMETHOD(PlayStateChanged)( long NewState ) { m_pParent->PlayStateChanged( NewState ); }
protected:
CMyEventHandler* m_pParent;
};
friend class CMyEventSink;
CMyEventSink* m_pMyEventSink;
CComPtr<IConnectionPoint> m_spConnectionPoint;
DWORD m_dwWMPEventsCookie;
void PlayStateChanged( long NewState );
...
};
The nested class CMyEventSink is the only part that is interesting as far as COM events are concerned. Here I just put it inside the outer CMyEventHandler, which seems to be a COM server itself, for clarification reasons and because I guess that you've already started going in this direction. This way you can see that CMyEventHandler exposes the two interfaces IMyEventHandler and IDispatch. The nested class, CMyEventSink, serves no other purpose than acting as an event sink for the IWMPEvents interface.
Given the declaration above, you can hook up for receiving IWMPEvents from the CMyEventHandler class like we've discussed earlier:
CComPtr<IWMPPlayer> spWMPPlayer;
CComPtr<IConnectionPoint> spConnectionPoint;
DWORD dwAdviseCookie;
HRESULT hr;
m_pMyEventSink = new CComObject<CMyEventSink>( this );
CComQIPtr<IConnectionPointContainer, &__uuidof(IConnectionPointContainer)> spConnectionContainer( spWMPPlayer );
if( spConnectionContainer )
{
hr = spConnectionContainer->FindConnectionPoint( __uuidof(IWMPEvents), &m_spConnectionPoint )
if( m_pMyEventSink && SUCCEEDED( hr ) )
{
hr = m_spConnectionPoint->Advise( (IUnknown*)m_pMyEventSink, &m_dwWMPEventsCookie );
}
}
When you're done receiving events from the Media Player, unregister as listener with the following:
m_spConnectionPoint->Unadvise( m_dwWMPEventsCookie );
m_spConnectionPoint.Release();
If you don't get it to work after trying out the above, I need to see your complete CMyEventHandler declaration. Well, you can of course omit the inherited functions from the IWMPEvents interface. I also need the snippet of code where your create whatever you provide in the call to IConnectionPoint::Advise() that should serve as event sink and also where actually make the call to Advise().
Naturally I don't know anything Media Player specific as I haven't been working with it. Not yet, at least. The parts I've understood to be Media Player specific I have just made qualified guesses and put some mocks to explain the bigger picture. E.g. the method PlayStateChanged() may very well be declared incorrectly and it may not at all be the event callback you need.
I've tried to concentrate on the COM stuff, some ATL quirks and how to set up an event sink the way I usually do it.
Phhwwweeee...... That was a long one, I even got a warning saying it's long when trying to post it.... 
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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