ACCESS FUNCTION OF ANOTHER CLASS - C / C++ / MFC Discussion Boards

Re: Read/Write to Ms Excel and Access using MFC?

David Crow8-Mar-04 3:56

David Crow

8-Mar-04 3:56

Search MSDN for articles on Excel (OLE) Automation.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

'type cast' warning

si_698-Mar-04 2:18

si_69

8-Mar-04 2:18

Hi all

i use the following piece of code to call an external program, however
i keep getting a warning message returned back which i compile

im using VS2003

the code is

HINSTANCE ok = ShellExecute(NULL, "open", "Update.exe", "NewUpdate", NULL, SW_SHOW);
if ((int)ok > 32)
{
AddToLog("Program run sucessfully",0);
}
else
{
AddToLog("Program failed to run ",0);
}

and the warning message i get back is
(1467): warning C4311: 'type cast' : pointer truncation from 'HINSTANCE' to 'int'

does ne1 have any ideas ??

thanks

si

Re: 'type cast' warning

Prakash Nadar8-Mar-04 2:28

Prakash Nadar

8-Mar-04 2:28

si_69 wrote:
if ((int)ok > 32)

nothing to worry about HINSTANCE is 32 bit data while
int is 16 bit data so when you type cast from higher bit size data to lowerbitsize data you tend to loose some data (16 high bits of information)
Logic is perfectly fine in this case and will work without any problem.
If you are still worried about the warning then
put long instead of int.

like this

if ((long)ok > 32)

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Re: 'type cast' warning

John M. Drescher8-Mar-04 8:18

John M. Drescher

8-Mar-04 8:18

Int is 32 bits in all versions of WIN32 Visual C++.

John

Re: 'type cast' warning

Prakash Nadar8-Mar-04 16:00

Prakash Nadar

8-Mar-04 16:00

Yeah you are right, he got a warning for trancation of data type, so obviously there was some size difference between the two.

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Re: 'type cast' warning

RChin8-Mar-04 2:29

RChin

8-Mar-04 2:29

According to the MSDN documentation, the HINSTANCE return value is not a true HINSTANCE type, but used for compatibility reasons.
So I assume it is safe to ignore the cast warning to an int (or you may suppress the warning with a #pragma, if it bothers you).

msdn ref[^]

I Dream of Absolute Zero

Re: 'type cast' warning

David Crow8-Mar-04 4:00

David Crow

8-Mar-04 4:00

si_69 wrote:
if ((int)ok > 32)

It's not good practice to use hard-wired numbers in your code. I suggest using HINSTANCE_ERROR instead. Then you can do something like:

HINSTANCE hResult = ShellExecute(...);
if (hResult < (HINSTANCE) HINSTANCE_ERROR)
    AddToLog("Program failed to run", 0);

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

ACCESS FUNCTION OF ANOTHER CLASS

Caoimh8-Mar-04 1:44

Caoimh

8-Mar-04 1:44

I'm trying to access function in a class which is defined in another class. I've tried to declare it as a friend, however this won't work for me.

Suggestions much appreciated
Kind Regards
Caoimh

Re: ACCESS FUNCTION OF ANOTHER CLASS

Prakash Nadar8-Mar-04 2:22

Prakash Nadar

8-Mar-04 2:22

First either make the methods in the other class as public, or declare ClassB(from the class you are trying to access) as friend in ClassA(whose methods you are trying to access)

other way friendship does not work, its not mutual. Smile | :)

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Re: ACCESS FUNCTION OF ANOTHER CLASS

Navin8-Mar-04 5:49

Navin

8-Mar-04 5:49

Could you post some example code? Too vague a question to really know what's going on.

Remember, even if you win the rat race, you're still a rat.

Monitoring Internet traffic

JGStanier8-Mar-04 1:14

JGStanier

8-Mar-04 1:14

How do I monitor traffic on an already open TCP/IP port? Do I need to use hooks? Eek! | :eek:

Re: Monitoring Internet traffic

David Crow8-Mar-04 5:54

David Crow

8-Mar-04 5:54

Do either of these tools help:

http://www.sysinternals.com/ntw2k/source/tcpview.shtml
http://www.sysinternals.com/ntw2k/freeware/tdimon.shtml

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

how can use MFC in a non MFC win32 project

Atif Mushtaq8-Mar-04 0:23

Atif Mushtaq

8-Mar-04 0:23

what steps i will have to do before i could use MFC in a win32 non mfc project.

Unmanaged in a .NET world

Re: how can use MFC in a non MFC win32 project

Robert A. T. Káldy8-Mar-04 1:20

Robert A. T. Káldy

8-Mar-04 1:20

Why?????
Isn't much simpler to use Win32 source files in MFC project?

Robert-Antonio

"A flower walked around a meadow. She saw a beatiful human and plucked off his head."

Re: how can use MFC in a non MFC win32 project

Atif Mushtaq8-Mar-04 1:25

Atif Mushtaq

8-Mar-04 1:25

Well i know it can be that way aswell , but i am more intrested in this cauz i have quite a few win32 projects (not written by me) and i want to extend them with MFC .

So still my question is same

Unmanaged in a .NET world

Re: how can use MFC in a non MFC win32 project

JGStanier8-Mar-04 1:48

JGStanier

8-Mar-04 1:48

Don't you just include the appropriate MFC header files (see StdAfx.h of standard MFC project)? Cool | :cool:

Re: how can use MFC in a non MFC win32 project

Atif Mushtaq8-Mar-04 2:04

Atif Mushtaq

8-Mar-04 2:04

If I Include all MFC Headers file it gives in linking error

"void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) already defined in LIBCMT.lib(new.obj)

when compiming in MFC Statis Library mode

Unmanaged in a .NET world

Re: how can use MFC in a non MFC win32 project

JGStanier8-Mar-04 2:17

JGStanier

8-Mar-04 2:17

Sorry, don't know then. Was wondering how to include MFC into Win32 myself. I think it may be best to create an MFC project, and then put or link all your Win32 stuff in there. Only option I can think of. Smile | :)

Re: how can use MFC in a non MFC win32 project

Prakash Nadar8-Mar-04 2:17

Prakash Nadar

8-Mar-04 2:17

Belive me its a pain to convert win32 application to MFC application its not as easy as including few header files and thats it.

Besides ur current win32 logic may stop functioning or give unexected error coz both are off different architecture. and besides there nothing much that MFC can do that win32 can't.
Smile | :)

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Re: how can use MFC in a non MFC win32 project

Atif Mushtaq8-Mar-04 3:43

Atif Mushtaq

8-Mar-04 3:43

Well I have solved this issue

1.First of include all headers files present in a MFC project stdafx.h

2.Go to Project --Settings ---General and select either MFC in shared library or MFC in static Library Option

3.In static library option it will give the already defined linking error to solve this issue follow this link and do the apropriate steps as given in this link
http://www.as-ltd.co.uk/cgi-bin/support/faq/XLPFAQ004.htm

after it include stdafx.h where u want to use MFC.

Unmanaged in a .NET world

Re: how can use MFC in a non MFC win32 project

Prakash Nadar8-Mar-04 15:57

Prakash Nadar

8-Mar-04 15:57

Too good man too good. Smile | :)

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Re: how can use MFC in a non MFC win32 project

Anonymous8-Mar-04 8:03

Anonymous

8-Mar-04 8:03

#include <windows.h> or #include <afxwin.h>

After that, the MFC classes should be available to your application.

Re: how can use MFC in a non MFC win32 project

Anonymous8-Mar-04 8:05

Anonymous

8-Mar-04 8:05

Sorry... that is #include <windows.h> or #include <afxwin.h>

reloading trayicon

zagzagzag7-Mar-04 23:02

zagzagzag

7-Mar-04 23:02

So.. i have made a program with a tray icon in the system-tray. And my problem is, that when explorer is hung and you restart explorer it dosent reload the tray icon..

Does anyone know how i can make the tray icon to reload??

Thanks in advance
Zagzagzag

Re: reloading trayicon

Prakash Nadar7-Mar-04 23:30

Prakash Nadar

7-Mar-04 23:30

From the MSDN

const UINT WM_TASKBARCREATED = 
    ::RegisterWindowMessage(_T("TaskbarCreated"));

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
    ON_REGISTERED_MESSAGE(WM_TASKBARCREATED, 
                          OnTaskBarCreated)
END_MESSAGE_MAP(CMainFrame, CFrameWnd)

LRESULT CMainFrame::OnTaskBarCreated(WPARAM wp, LPARAM lp)
{
    VERIFY(InstallIcons());
    return 0;
}

BOOL CMainFrame::InstallIcons()
{
    NOTIFYICONDATA nid; 
    //
    // stuff nid with args
    //
    return Shell_NotifyIcon(NIM_ADD, &nid);
}

Hope you get the idea

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