C / C++ / MFC Discussion Boards

The question about how to implement abstract class in COM

Rassul Yunussov18-Dec-04 6:41

18-Dec-04 6:41

For example i got next architecture:

class BaseClass
{
 virtual void Method1();
 virtual void Method2();
};

class FuncClassOne: public BaseClass
{
	void Method1();
 	void Method2();
};
class FuncClassTwo: public BaseClass
{
	void Method1();
 	void Method2();
};
class Grup
{
  BaseClass** m_ppObjects;
  void CallAllMethods();
  void Add(BaseClass* pBaseClass);
  BaseClass* GetObject(long ObjectID);
};

So, i want to save this architecture and place everything in COM;
Let me try to explaint what i need (I imagine ):

IGrupPtr group(CLSID_Grup); //I hope to see it as interface
for(int i = 0;i<10;i++)
{
	IFuncClassOnePtr p(CLSID_FuncClassOne); //I hope to see it as interface
	group->Add(p);
}

for(int i = 0;i<10;i++)
{
	IFuncClassTwoPtr p(CLSID_FuncClassTwo); //I hope to see it as interface
	group->Add(p);
}
group->CallAllMethods();

BaseClass* pClass = group->GetObject(7);
So how can i make frome every class COM Interface?
Is it possible? Or i need to choose another way???

Re: The question about how to implement abstract class in COM

Andy Hunter19-Dec-04 15:12

Andy Hunter

19-Dec-04 15:12

Their is quite alot of things that go into making a COM object, however to set you in the right direction:

1. your 2 interfaces I am assuming will be FuncClassOne and FuncClassTwo. To do that you need to define them as such (BTW all COM interfaces derive from IUnknown)

interface FuncClassOne : IUnknown
{
      virtual void __stdcall Method1() = 0;
      virtual void __stdcall Method2() = 0;
}
interface FuncClassTwo : IUnknown
{
      virtual void __stdcall fc2_Method1() = 0;
      virtual void __stdcall fc2_Method2() = 0;
}

2. Now you will need your COM object, containing your interfaces and the implementations.

class FuncClass : public FuncClassOne,
                  public FuncClassTwo
{
public:
          //every COM object needs to implement these 3 functions
          virtual HRESULT __stdcall QueryInterface(REFIID iid, void** ppv);
	  virtual ULONG __stdcall AddRef();
	  virtual ULONG __stdcall Release();
          //now implement your functions
          virtual void __stdcall Method1();
          virtual void __stdcall Method2();
          virtual void __stdcall fc2_Method1();
          virtual void __stdcall fc2_Method2();
          //std class stuff
          FuncClass();
          ~FuncClass();
private:
          long m_cRef;
};

3. Now you need to implement your COM functions

This was really just so you could see the COM implementation in C++ for what you were asking (At least I hope it was what you were asking). You really should look on MSDN for what is required to implement the COM functions and how to create CLSIDs and register your component. Unfortunately the topic is just too large to be answered fully, on this post. I hope I at least got you going in the right direction and knowing what to look for now.

Re: The question about how to implement abstract class in COM

Rassul Yunussov20-Dec-04 3:58

Rassul Yunussov

20-Dec-04 3:58

Thank you for participating i tried to do something like you show me:
So I made an ATL Project, and in the midle file i wrote next thing:
[
object,
uuid(BFBF8B9C-64BF-42bc-82D5-8564B637012B),
dual,
nonextensible,
helpstring("IAbstractGeoObject Interface"),
pointer_default(unique)
]

interface IAbstractGeoObject : IDispatch
{
[id(1), helpstring("method Draw")] virtual HRESULT Draw() = 0;
}
[
object,
uuid(16578C15-F715-4A3A-94E7-70C1387A53B7),
dual,
nonextensible,
helpstring("IGeoObject Interface"),
pointer_default(unique)
]
interface IGeoObject : IAbstractGeoObject{
[id(1), helpstring("method Draw")] HRESULT Draw(void);
};

But it doesn't want to compile it... It shows next error message:
"Expecting a type specification near "virtual""...
So i'm in the dead end...

view excel document with MFC program

silanitme18-Dec-04 5:33

silanitme

18-Dec-04 5:33

Hi,
I made a button that when you press it opens a CFileDialog,
I want it to open excel file with the excel program (excel XP or excel 2003)
after downloading each and every example there is I still couldn't found how do I do it.
you can open the file if you are right clicking the file and then choosing open, but I want it to do the same when you are doing open through the panel

please help me.. Confused | :confused:

Lani

Re: view excel document with MFC program

wb18-Dec-04 9:45

18-Dec-04 9:45

have you looked at ShellExecute()?

playing audio files back and forward

Member 147834218-Dec-04 4:12

Member 1478342

18-Dec-04 4:12

Hi
I was wondering if anyone knows the minimal code necessary to play a sound file of whatever sort (mp3, wave, whatever else...) at different speeds and/or in different directions (back or forward). Basically I'd like to make a super simple
turntable program... something with a "load" "play" and "stop" button and a slider that decides speed and direction of
your song...

thanks for any advice.

fred

Re: playing audio files back and forward

Alex Korchemniy18-Dec-04 23:11

Alex Korchemniy

18-Dec-04 23:11

I haven't done much code in this area... but look into the Windows Media Player SDK. It not going to be the most efficient solution but it sure is the laziest one. Poke tongue | ;-P

Alex Korchemniy

Regarding odl file

Billar18-Dec-04 3:40

Billar

18-Dec-04 3:40

Please let me know about the basics about .odl file, it's creation and purpose.

Any kind of suggesion or link to the particular documentation will help me a lot............

looking for your immediate response...

Blush | :O

MFC: Enlisting

missnazar18-Dec-04 3:30

missnazar

18-Dec-04 3:30

I want to enlist various file types much like that enlisted in Search >> For files and folders >> type >> combobox of Windows Microsoft 2000 Professional.

that is.... known file types on system along with name and icon...How is that done.

MFC: Enlisting

missnazar18-Dec-04 3:27

missnazar

18-Dec-04 3:27

I want to enlist various file types much like that enlisted in Search >> For files and folders >> type >> combobox

that is known file types along with name and icon...How is that done.

MFC :Property Sheet

missnazar18-Dec-04 1:32

missnazar

18-Dec-04 1:32

I have an edit box on property page. I want to fetch its value in my formview.cpp . Then how is that done ? Can Some one help me out.

Thanx in advance.

Drushti

Re: MFC :Property Sheet

ThatsAlok18-Dec-04 2:30

ThatsAlok

18-Dec-04 2:30

Miss Nazar,
if you know the ID of the EditBox you can use following api to retieve the value

1.GetDlgItemText<br />
 2.GetDlgItemInt

or I think you are using MFC , just add the variable to
the EditBox using MFC ClassWizard>>member variable,

and When ever you need the value just Call
UpdateData(TRUE); and you variable will
fill with value present in Editbox

-----------------------------
"I Think this Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: MFC :Property Sheet

missnazar18-Dec-04 2:56

missnazar

18-Dec-04 2:56

THankyou it worked!!

Modifying an external EXE's version resource

kenshin_x18-Dec-04 0:29

kenshin_x

18-Dec-04 0:29

How do I modify values (Comments, CompanyName, FileDescription, LegalCopyright, etc) in the StringFileInfo block of an external EXE resource?

Sample code would be greatly appreciated!

Re: Modifying an external EXE's version resource

Spiritofamerica18-Dec-04 13:39

Spiritofamerica

18-Dec-04 13:39

I don't have sources but there is no magical api that will do this(as far as I know) you havve to open the file and write to it replacing the info you want to replace with your info.

To know what to replace you need to lear about PE headers so you can find where the info is stored and overwrite it.

That's all I know on the subject,

hei, if you manage to do this send me the source to ok?

Re: Modifying an external EXE's version resource

kenshin_x19-Dec-04 16:13

kenshin_x

19-Dec-04 16:13

Hi Spiritofamerica. Thanks for the heads up on PE headers. I'll have to look into it. If I manage to find a solution. I'll make it available.

Re: Modifying an external EXE's version resource

David Crow20-Dec-04 8:39

David Crow

20-Dec-04 8:39

Just a guess, but have you tried using UpdateResource(..., RT_VERSION, ...)?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

How To debug a Running DLL

ThatsAlok17-Dec-04 23:54

ThatsAlok

17-Dec-04 23:54

I have Seen many people debuging there dll when they are running under context of some other application and they are able to set break point tooo.

i am too use to bebug with help of MessageBoxes(Yeah it Silly,but work for me ) but now it not working as i have to make a LSP Dll.so what i need to DEBUG any runnign DLL.

Hope somebody understand my Problem . PLEASSSSSSSSSeeeee

-----------------------------
"I Think this Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: How To debug a Running DLL

avenger_sb2518-Dec-04 1:13

avenger_sb25

18-Dec-04 1:13

Well , if you are using Visual Studio IDE,
Press F9 to set a breakpoint in the source file.

Then, Go to :

Project>>Settings>>Debug TAB

In the "Executable for debug session:" Edit box, BROWSE and select the EXE file that is going to use your dll.

THEN PRESS 'OK'

NOW RUN YOUR PROGRAM BY CLICKING THE '!' ICON OR ON THE TOOLBAR...or <ctrl+f5>. THIS WILL RUN THE EXE THAT YOU SELECTED EARLIER.
NOW IF THAT PROGRAM(EXE) MAKES USE OF AN EXPORTED FUNCTION FROM YOUR DLL, AND IF YOU HAVE SET UP YOUR BREAKPOINTS CORRECTLY, YOU CAN DEBUG YOUR DLL......

happy debugging!

...Avenger

Remember... testing & debugging are always part of programming ...so exterminate those stinking bugs

Re: How To debug a Running DLL

ThatsAlok18-Dec-04 2:16

ThatsAlok

18-Dec-04 2:16

Thank You sir!

actually my problem is I am developing Layered Service Provider DLL(which will filter all the call make through the WINSOCK DLL)

now i don't know which exe is handlling the call or filtering Winsock request.

Now what i DO D'Oh! | :doh:

-----------------------------
"I Think this Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: How To debug a Running DLL

Renjith Ramachandran18-Dec-04 6:32

Renjith Ramachandran

18-Dec-04 6:32

put the exe file name in project>Settings>Debug (executable for debug section)

Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.

E_INVALIDARG with EnvDTE::Commands::AddNamedCommand

Franz Klein17-Dec-04 20:58

Franz Klein

17-Dec-04 20:58

I am always getting a return value of E_INVALIDARG when the function AddNamedCommand is called: Cry | :((

CComPtr<envdte::command> pCreatedCommand;

hr = pCommands->AddNamedCommand(m_pAddInInstance, CComBSTR(commandname), CComBSTR(commandtext), CComBSTR(tb_name), VARIANT_FALSE, IDB_LOGO, NULL, EnvDTE::vsCommandStatusSupported+EnvDTE::vsCommandStatusEnabled, &pCreatedCommand);

IDB_LOGO is a 16x16 Bitmap.

I am using Visual Studio .NET 2003 on Win XP SP2. I have looked at the documentation and at other examples but I can't find where I am going wrong.

Any ideas?

I am the handsome one in the crowd.

special folder

zpc_93017-Dec-04 19:05

zpc_930

17-Dec-04 19:05

Hi Anybody know the property of special folder (such as Downloaded Program Files,Offline Web Pages )which We can not paste folder and file in such folder?

CSliderCtrl Problem

Fayez El-Far17-Dec-04 15:47

Fayez El-Far

17-Dec-04 15:47

I have a slider bar that determines a position in a synchronization thread. The thread accesses tonnes of linked lists, and on-disk files. Whenever the user drags the slider bar I get exceptions because the updates to the thread are too fast. I need a way to determine when the dragging has stopped, so I can only update the thread with the final slider position.
URGENT HELP NEEDED!

Fayez

Re: CSliderCtrl Problem

Ravi Bhavnani17-Dec-04 16:43

Ravi Bhavnani

17-Dec-04 16:43

I think you need to handle the notification for TB_THUMBPOSITION instead of TB_THUMBTRACK. In the interests of user friendliness, you should also handle notifications for TB_PAGEDOWN, TB_PAGEUP, etc.

/ravi

My new year's resolution: 2048 x 1536
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