Re: Accessing a view's members from another class - C / C++ / MFC Discussion Boards

Shog⁹21-Feb-02 9:27

21-Feb-02 9:27

When using MFC, you can create a member variable of type COleDropTarget and call Register() passing in your CWnd*. Then the virtual methods OnDragEnter(), OnDrop(), etc. will be called (if they are implemented).

farewell goodnight last one out turn out the lights

Smashing Pumpkins, Tales of a Scorched Earth

Re: Drag'n drop

Anders Molin21-Feb-02 9:43

Anders Molin

21-Feb-02 9:43

You have to send the message yourself, from the right view.

When you call setcapture from the right view, it's that view that get the drop message, then you can send a message to the windows undr the mouse, that you are dropping things in it...

- Anders

Money talks, but all mine ever says is "Goodbye!"

Accessing a view's members from another class

kostasdel21-Feb-02 3:07

kostasdel

21-Feb-02 3:07

Hi, I'd like to ask if anyone knows any good method to access a view's member functions or methods, from an outside class, in MFC Doc/View architecture, without using friend operators or methods, or with the scope resolution operator because that things does not work well on my project... (I'm trying to access from a TreeCtrl or TreeView potected code, some public functions and members from an other view and i got a compiler message "illegal call of non-static member functions").
What i ask is if there is a general way to override such member function calls or sth else to make this work. (The project i'm developing is an Image Viewer app which i will post in future, like ACD See or PolyView).
Sorry if these may sound funny for some experts, but although i program c/c++ 4 years i tried MFC the last months...Thanks. Smile | :)

Re: Accessing a view's members from another class

Joaquín M López Muñoz21-Feb-02 3:10

Joaquín M López Muñoz

21-Feb-02 3:10

"illegal call of non-static member functions"

The message seems to imply that the problem has not to do with public/privateaccess, but rather with calling a non static member function as if it were static. Does this ring a bell for you, or am I totally off track?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Accessing a view's members from another class

kostasdel21-Feb-02 4:40

kostasdel

21-Feb-02 4:40

Thanks for replying... actually i tried to use these functions as static and as non-static but none of them seems to work properly (same compiler message), because there is a fact that no need is a static call on this view. I found an article by another reply to my message which might work. (accessing a view from anywhere).If it doesn't work i think a must override some accessor member function of the view but i wanted sth simple to solve such a thing.

Re: Accessing a view's members from another class

Mazdak21-Feb-02 3:18

Mazdak

21-Feb-02 3:18

check this

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Re: Accessing a view's members from another class

kostasdel21-Feb-02 4:45

kostasdel

21-Feb-02 4:45

Thanks for your suggestion, and for the very nice Pink Floyd song...but in contrast i will say the TIME song from them... "...ten years have left behind you..." (to check all the codeproj articles i may need ten years and without solution maybe...) But OK,this article seems to be working. Smile | :)

Re: Accessing a view's members from another class

Mazdak21-Feb-02 5:51

Mazdak

21-Feb-02 5:51

kostasdel wrote:
"...ten years have left behind you..." (to check all the codeproj articles

Laugh | :laugh:

You have to become old in CP to know all the places of it(thats persian expression,I don't know if you got it in English) Wink | ;)

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 3:05

Braulio Dez

21-Feb-02 3:05

Hi,

I want to pass a metafile to an ATL server, so I encapsulated it on a PictureBox object, and then saved it on one IStream, then I try to recover it in the ATL object, and it gives me on error, the code that I use is:

MFC client:

if(IPict) {
    IStorage *pIStg;
    Res = ::StgCreateDocfile(NULL, STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE, 0, &pIStg);
   if(pIStg) {
      IStream *TempStream = NULL;


      Res = pIStg->CreateStream(OLESTR("MyPicture"), STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE, 0,0, &TempStream);

      IPict->SaveAsFile(TempStream, TRUE, NULL);
      m_GDIGr.SetMetafile(TempStream);
   }
}

ATL Server:

STDMETHODIMP CGDIGraphics::SetMetafile(IStream *pStream)
{
   
   //PictureHolder PicHolder;
   //CComQIPtr<IPicture> Pict; // = PicHolder;

   IPicture *Pict = NULL;     
      
   HRESULT Res = ::OleLoadPicture(pStream, 0, FALSE, IID_IPicture,(void **) &Pict);

   
   if(Pict) {
      ::MessageBox(NULL, "PICT", "PICT", MB_OK);
   }

	return S_OK;
}

What I had made wrong ?, Thanks in advance, Bye !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Mazdak21-Feb-02 3:33

Mazdak

21-Feb-02 3:33

Hi Braulio Smile | :)

Braulio Díez wrote:
it gives me on error

You didn't mention what is that error Confused | :confused:

Anyway,Did Dr.Grimes reply you?If the answer is yes would you please tell the answer too?
Thanks

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 3:49

Braulio Dez

21-Feb-02 3:49

Hi,

Well the error message is quite dissapointing...

0x8000ffff E_UNEXPECTED

Dr. Grimes didn´t answer me, but well, I keep on researching, and it seems that you have to encapsulate the metafile in a PictureBox control ( IPicture), and the destination is not in the same DLL so I need to save the object in one stream ( I use for that IStream), and then in the ATL server I take that string and try to load the pic...

But... I when I´m going to read from the stream it doesn´t... Dead | X|

I know this is a quite common issue, just to pass a metafile from one process to another using COM, it´s one of the basic thing from COM, the sad thing is that anybody that knows the answer wants to give a hint.... Frown | :-(

Thanks for you interest mazdak, Bye !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Mazdak21-Feb-02 4:22

Mazdak

21-Feb-02 4:22

Hi:
Sorry,my ATL knowledge is not enough to help you. Frown | :(

It's very dissapointing that although there are lots of expert in CP but it seems
non of them (or few of them) have good ATL knowledge. Frown | :(

There are about 30000 members in this site... Dead | X|

Good luck and Bye

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 7:25

Braulio Dez

21-Feb-02 7:25

Hi Mazdak !

Finally I got the solution, Joao Vaz give me one URL to a nice article, and now it is working nice !!! ( there were some magic with the streams XDDD ).

I have to tidy up all the code and make a submission to codeproject. Bye !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez13-Mar-02 2:41

Braulio Dez

13-Mar-02 2:41

Hola !

As I promised you I Wrote the article about Streams and Pictures and ActiveX, you can check it out in:

http://www.codeproject.com/useritems/PictureTransfer.asp

The bad thing... something went wrong with the submission wizard and the Picture and the zip with the source is not there ( I sent one e-mail to chris with the files, let´s hope he fixes it).

Bye !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Joao Vaz21-Feb-02 4:38

Joao Vaz

21-Feb-02 4:38

Braulio, just one thought , you tried to create the stream on global memory
with the CreateStreamOnHGlobal and get the global handle from the server with
GetHGlobalFromStream , this without using Stg ?

Joao Vaz

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 5:26

Braulio Dez

21-Feb-02 5:26

Hi,

Thanks for the tip, I´m trying it now, but it gives me the same error, here it is the code that I use now:

MFC Client:

IStream *TempStream = NULL;

CreateStreamOnHGlobal (NULL, TRUE, &TempStream);

HGLOBAL hMem = NULL;
GetHGlobalFromStream(TempStream, &hMem);
LPVOID lpData = GlobalLock(hMem);

HRESULT HRes = IPict->SaveAsFile(TempStream, TRUE, 0);
GlobalUnlock(hMem);

m_GDIGr.SetMetafile(TempStream);

ATL Server:

STDMETHODIMP CGDIGraphics::SetMetafile(IStream *pStream)
{
   
   IPicture *Pict = NULL;        

   HGLOBAL hMem = NULL;
   GetHGlobalFromStream(pStream, &hMem);
   LPVOID lpData = GlobalLock(hMem);   
   HRESULT Res = ::OleLoadPicture(pStream, 0, FALSE, IID_IPicture,(void **) &Pict);
   GlobalUnlock(hMem);

I don´t know where I made the mess Frown | :-(

, ( I´m pasting the activeX in an automated Ms Word instance and from my app calling the method to insert the activex, all this should be easy-pc for Com isn´t it ? )

Thanks, Bye !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Joao Vaz21-Feb-02 6:15

Joao Vaz

21-Feb-02 6:15

Perhaps this article could help ?http://www.devx.com/premier/mgznarch/vbpj/1999/04apr99/vp0499.pdf

Cheers,

Joao Vaz

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 7:18

Braulio Dez

21-Feb-02 7:18

Hi Joao !

I had that article before, but well I read it again, and you were right !!!, there is the solution !!!, thanks a lot !

See you and obrigado !

Braulio

Re: Trying to use IStream to pass data to an ATL Server

Joao Vaz21-Feb-02 7:42

Joao Vaz

21-Feb-02 7:42

Cool

, now you can post a article on Code Project

Cheers,

Joao Vaz

Re: Trying to use IStream to pass data to an ATL Server

Joaquín M López Muñoz21-Feb-02 6:19

Joaquín M López Muñoz

21-Feb-02 6:19

Hi Braulio, unfortunately seems like most of us in this forum are COM-impaired Cry | :((

but I'm following your investigations with great interest, and doing a little research myself. I've just sumbled upon these two functions:

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/com/cmf_a2c_88tp.asp">CoMarshalInterThreadInterfaceInStream</a>

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/com/cmf_a2c_1rjh.asp">CoGetInterfaceAndReleaseStream</a>

,
which seem to do the job of packing and unpacking an object with the aid of an IStream to pass things across threads. Maybe they're worth having a look at. Good luck.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 6:42

Braulio Dez

21-Feb-02 6:42

Thanks for the tip !

MMm..., I don´t know too much about marshaling, but well it´s good time to start learning, I think I have to use maybe something like "CoMarshalInterface", because I have different process, I have:

MyApp -( Different Space Proccess)-> Word Automated Instance --> MyDll

I´m advancing but very slow, but now I can paste the ActiveX in a Word automated instance, modify it from my app, and even make serialize it !, the last step it´s to do something useful XD, like for example get the picture...

I swear that if I get all this things up and running I will write a mega article for codeguru talking about this stuff Big Grin | :-D

Thanks for the help Joaquin, Hasta luego !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Joaquín M López Muñoz21-Feb-02 6:41

Joaquín M López Muñoz

21-Feb-02 6:41

I swear that if I get all this things up and running I will write a mega article for codeguru talking about this stuff

codeguru? Poke tongue | ;-P

Suerte con la historia ésta, seguro que cuando acabes tendrás mogollón de información para un buen artículo.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Trying to use IStream to pass data to an ATL Server

Braulio Dez21-Feb-02 7:17

Braulio Dez

21-Feb-02 7:17

HOOLA !!!

Ooops, sh*t not codeguru... CODEPROJECT OF COURSE Smile | :)

I GOT IT !!!!, It is working now, thanks to the article ( "Using Picture Objects in ATL", from VBPJ, page 102, wow it´s not so easy to make work the streams and streams persists).

Ahora tengo que ajustarlo para que no pierda memoria ni recursos, y en cuanto lo tenga voy a hacer un pedaaasssoo de artículo... XDDDD

Hasta luego, y gracias por los ánimos !
Braulio

Re: Trying to use IStream to pass data to an ATL Server

Joaquín M López Muñoz21-Feb-02 7:38

Joaquín M López Muñoz

21-Feb-02 7:38

enhorabuena chaval Smile | :)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Trying to use IStream to pass data to an ATL Server

Mazdak21-Feb-02 7:26

Mazdak

21-Feb-02 7:26

Congratulation!

I'm waiting for that article ,come on Braulio,but I want it here in COPDEPROJECT not codeguru.
Big Grin | :-D

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

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