C / C++ / MFC

Adding Functions to Interface

22-Nov-06 22:11

CHARFORMAT2 cf;
memset(&cf, 0, sizeof(CHARFORMAT2));
cf.cbSize = sizeof(CHARFORMAT2);
cf.dwMask = CFM_BOLD;
cf.dwEffects = CFE_BOLD;
COLORREF clr =RGB(255, 10, 15) ;
cf.dwMask =CFM_COLOR;
//cf.dwEffects = CFE_AUTOCOLOR; // Bold
cf.crTextColor = clr;

Suresh H22-Nov-06 21:41

22-Nov-06 21:41

Hello All,

I have small and simple COM program to access a Add function in Dll and I am accessing this function from main program. For the simple add function it is working, interface and dll files are working properly.

For this interface I am trying to add one more function by name getdate() which of return Char* .. can any one please help how to declare the getdate() function in interface ???

Below are declaration and files with there names ….

// File interface.h
// This file contains interface related declarations.

#ifndef _A_INTERFACE_H_
#define _A_INTERFACE_H_

DECLARE_INTERFACE_(IMyA,IUnknown)
{
STDMETHOD_(LONG,MyAdd)(INT,INT) PURE;
};

--- ---

--- ---

file :- MyA.h

class CMyA : public CCmdTarget
{
DECLARE_DYNCREATE(CMyA)

CMyA();

-- -- -- - - -- -- -- - -

-- -- -- - - -- -- -- - -

-- -- - -

-- -- - --- -- -- - --- -- -- - -

protected:
virtual ~CMyA();
DECLARE_MESSAGE_MAP()

BEGIN_INTERFACE_PART(MyAObj,IMyA)
STDMETHOD_(LONG,MyAdd) (INT,INT);
END_INTERFACE_PART(MyAObj)

DECLARE_INTERFACE_MAP()
DECLARE_OLECREATE(CMyA)

};

// MyA.cpp : implementation file

-- -- -- --- -- --

//IMyA Functions
STDMETHODIMP_ (LONG)
CMyA::XMyAObj::MyAdd (INT x,INT y)
{
return (x+y);
}

-------------------------------

// function to be added to Interface can u please help me how to declare this function in interface.

char* getDate()
{
struct tm *newtime;
char am_pm[] = "AM";
-- - - -
--- - -- - - -

}

Thanking you,
Suresh H

Roger Stoltz23-Nov-06 0:10

Roger Stoltz

23-Nov-06 0:10

From the macros you're using I guess you implement the server using ATL.
Use the class wizard to add your new interface method: right click on the interface in the class view and select "Add method..." or something like that.

Hope this helps
--
Roger

"It's supposed to be hard, otherwise anybody could do it!" - selfquote

"No one remembers a coward!" - Jan Elfström 1998
"...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above

Suresh H23-Nov-06 0:29

23-Nov-06 0:29

Hi Roger,

Thanks a lot for the response.

I was waiting for a long time for the response thanks a lot.

Actually I did not use wizard for creating interface or for adding interface methods.
I manually written the code for the Add function and its working I can access the add
Function from the main function

Main function

int main (void)
{
IClassFactory *pclsf;
IUnknown *pUnk;
IMyA *pA;
int x,y;
long result;

//Initialize the OLE libraries
CoInitialize(NULL);

//get the IClassFactory interface pointer
HRESULT hr = CoGetClassObject(
MYA_CLSID,CLSCTX_INPROC,NULL,IID_IClassFactory,
(void **) &pclsf);

//USe IMyA interface for additions
printf("Input two numbers you want to add.\n");
scanf("%d\n%d",&x,&y);
result=pA->MyAdd(x,y);

The above function is working properly now I want to add one more function to interface
Which I have mentioned in the earlier post.

Can u please help me with that .. can u please tell me how to add function to interface

// file Interface.h

DECLARE_INTERFACE_(IMyA,IUnknown)
{
STDMETHOD_(LONG,MyAdd)(INT,INT) PURE;

}

no I want to add this function

har* CMyA::getDate()
{
struct tm *newtime;
char am_pm[] = "AM";

-- -- --

How to add this function to interface ?? please help me out …

Roger Stoltz23-Nov-06 0:38

Roger Stoltz

23-Nov-06 0:38

As I see it there are two ways of implementing a COM server using ATL:
either you use the wizard provided help or you don't.
If you choose not to use the wizards, things get a little more hard but could be worth the trouble since you'll learn a lot from it.

In my opinion the best way to learn it is by actually doing it... i.e. in your situation create a dummy ATL project and make a backup of the files, then use the wizard to add an interface method and compare the files with the files in your backup copy.
Then you'll know what to do.

--
Roger

Suresh H23-Nov-06 0:48

23-Nov-06 0:48

Hi Roger,

I am very much new to COM , I got an example in book I just went through it and created a working dll file .

There they have not used wizard for adding methods. I know how to add a new class for the project.

Can u please tell me how to add methods to interface using Wizards. ??

Thanking you..

Suresh H

Roger Stoltz23-Nov-06 1:02

Roger Stoltz

23-Nov-06 1:02

Have a look at this article[^] in the CodeProject COM section. It describes how to create the project and add functionality to the server.

Have a look at other articles in the same section as well, CodeProject articles are a great starting point since people often tend to write about their own experiences. Try to find an article that meets your level of expertise/knowledge on the subject and startfrom there.

The article I suggested above looks suitable given how I interpreted your needs, but there might be another article that may help you better. Simply browse through the list of COM articles and judge from the heading to sort those out that you're interested in.

--
Roger

Suresh H23-Nov-06 1:16

23-Nov-06 1:16

Hi Roger,

Thanks a lot for the help. LINK will help me a lot.

Regards,
Suresh H

Multicore with VS6?

bosfan22-Nov-06 21:16

bosfan

22-Nov-06 21:16

Hello,
is it posible to make programs with VS6(C++) for multicore cpu?

Thanks in advance
break;

Waldermort22-Nov-06 22:04

Waldermort

22-Nov-06 22:04

yes, but I would advise you to use the most up to date platform SDK.

bosfan22-Nov-06 23:55

bosfan

22-Nov-06 23:55

Hello,
thank you for your reply, i have the newest version of platform SDK,
are there any settings in my projectsolution to take, or how to know that my application is for
multicore cpu created?

thanks!
break;

Michael Dunn23-Nov-06 0:25

Michael Dunn

23-Nov-06 0:25

If your app is single-threaded, then you won't get any benefit from multiple CPUs or cores. If you do create other threads, let the OS schedule the threads across the CPUs as needed.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

bosfan23-Nov-06 0:56

bosfan

23-Nov-06 0:56

Hello Mike,
yes, ok, i like to know for the future how to use this in programming,
and my current app is multithreaded, maybe i can make this to multicore app...when i know more about multicore programming..

regards
break;