fstream quirkiness using various open modes - C / C++ / MFC Discussion Boards

Still learning how to code24-Dec-09 20:27

24-Dec-09 20:27

Hi Garth, I think that the real problem is that the folder that I want to watch is on a NAS disk and so the "This code will only work on Windows NT, Windows 2000, or Windows XP, and the directory you wish to watch must also reside on a WindowsNT, Windows 2000, or Windows XP computer" is going to make it a non-starter. I've now implemented a polling _findfirst/_findnext strategy which, although a bit basic, works fine !! (Just hope that the NAS disk can stand the traffic !!) Many thanks for your determination to find me a solution !!! Cheers !

Doug

Windows coordinate system different in US and European version

Denny10123-Dec-09 11:02

Denny101

23-Dec-09 11:02

Hi,
I have a graphic application (2D editor) compiled on US Windows Vista (using Borland compiler). If I use default mapping mode (MM_TEXT) it works OK in all versions of Windows. However, if I use other mapping modes (MM_HIMETRIC - which changes y axis orientation and my code reflects this) the graphics are not visible in European version of Windows (German, Czech). I have read somewhere that European version of Windows have opposite axis orientation in other than default mapping mode.
If you know how to deal with this problem I would appreciate your time and help.
Thanks,
Denny101

Re: Windows coordinate system different in US and European version

Nelek23-Dec-09 23:30

Nelek

23-Dec-09 23:30

I didn't know about that, I thought it should be "standard", but... one possibility could be to get the version of windows and adapting your coordinates to the differences.

I use German Windows, by printing or previewing I use:

pDC->SetMapMode (MM_LOMETRIC);
//...
pDC->TextOut (pInfo->m_rectDraw.left, 50 - pInfo->m_rectDraw.bottom, pDoc->GetPathName());
//...

With this I print the path of the file at the bottom of the page.

You say the Y orientation changes between countries, then my
50 - pInfo->m_rectDraw.bottom should change and be pInfo->m_rectDraw.bottom - 50 for US, shouldn't it?
the result is just the change of the sign, at german version will be -X and at US will be X

A way to do it could be getting the version of windows and adapting the +/- to it. So you can get the version of windows (sorry but I don't know how to for sure) at the initialization of the program in BOOL CMyApp::InitInstance() and say:

if ((windows == US) || /* Other countries with same settings than US */)
   iFactor = 1;
else
   iFactor = -1;

and afterwards

pDC->SetMapMode (MM_LOMETRIC);
pDC->TextOut (pInfo->m_rectDraw.left, iFactor(pInfo->m_rectDraw.bottom - 50), pDoc->GetPathName());

Using as coordinates with Y positive to go down, and that would adapt the sign, according to the windows version.

I guess there is a better approach, but this is an idea.

Regards.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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Re: Windows coordinate system different in US and European version

Denny10125-Dec-09 9:45

Denny101

25-Dec-09 9:45

Thanks Nelek for your help. After some more testing I think the problem is not in the axis orientation but in the screen refreshing. I used a different component for drawing than in my previous programs and it needs a different method of refreshing. I will post the result when I know where the issue was.
All the best,
Denny101

Re: Windows coordinate system different in US and European version

Nelek27-Dec-09 22:16

Nelek

27-Dec-09 22:16

You are welcome Smile | :)

[quote]
I will post the result when I know where the issue was.
[/quote]

Please do it. I am curious about.

Regards.
--------
M.D.V. Wink | ;)

Re: Windows coordinate system different in US and European version

Denny1013-Jan-10 10:22

Denny101

3-Jan-10 10:22

Hi,
I found the problem with my program running on European Windows - it is in the decimal separator! European use comma, while the US (and all English countries) use dot. My program reads a file with coordinates in a string format. I use Borland Builder C++ and I trusted it that its method AnsiString::ToDouble() makes the conversion according to the OS used - but it does not. After I changed the conversion method to STL C++ strtod() it works fine on all systems.
Regards,
Denny

Re: Windows coordinate system different in US and European version

Nelek3-Jan-10 21:19

Nelek

3-Jan-10 21:19

Glad you found the solution. Smile | :)

Regards.
--------
M.D.V. Wink | ;)

fstream quirkiness using various open modes

Alan Kurlansky23-Dec-09 8:56

Alan Kurlansky

23-Dec-09 8:56

Upon a cold start, I create an fstream replay file that's opened for output ios::out. If my program stops and does a warm restart, I open the file for ios::in and process the file. Then I close it and reopen it as ios::out | ios::app. This second open succeeds if did not read (getline) any data when opened for ios::in; but fails if I did read data. I thought that flushing the file before closing might have helped, but it didn't. This is not the kind of behavior I, for one would've expected. Any ideas or suggestions?
Thanks

Re: fstream quirkiness using various open modes

rp_suman23-Dec-09 9:56

rp_suman

23-Dec-09 9:56

You can check the stream state for all operations open/create/write you are doing. May be the file is empty while you are opening it?

Checking documentation for fstream may help you..

--
"Programming is an art that fights back!"

combobox notification before changing selection

rp_suman23-Dec-09 8:20

rp_suman

23-Dec-09 8:20

When selecting a different item in my combobox control, I need to save some dialog information for the previously selected item. Which combobox notification should I use for this purpose and how?

Thanks

--
"Programming is an art that fights back!"

Re: combobox notification before changing selection

Abhi Lahare23-Dec-09 10:26

Abhi Lahare

23-Dec-09 10:26

From MSDN:
ON_CBN_SELCHANGE The selection in the list box of a combo box is about to be changed as a result of the user either clicking in the list box or changing the selection by using the arrow keys. When processing this message, the text in the edit control of the combo box can only be retrieved via GetLBText or another similar function. GetWindowText cannot be used.

How to enable DefaultIcon immediately after setting in Registry?

hawkgao012923-Dec-09 5:14

hawkgao0129

23-Dec-09 5:14

Hello, folks,
I set a file association programmically. point the DefaultIcon key value to a .ico file. but after my setting operation. the icon is not be shown with the associated file. but, i noticed that the msi installer can refresh the explore and enable the associated icon with files after installing?
How to enable the setting immediately? what API should i call?

Thanks,
hawk

Re: How to enable DefaultIcon immediately after setting in Registry?

Abhi Lahare23-Dec-09 7:23

Abhi Lahare

23-Dec-09 7:23

UpdateWindow(handle_to_desktop_window)

Re: How to enable DefaultIcon immediately after setting in Registry?

hawkgao012923-Dec-09 18:11

hawkgao0129

23-Dec-09 18:11

I got the answer, refresh explorer by using SHChangeNotify() .

Modeless Child Dialog Detection in Parent Dialog

A&Ms23-Dec-09 3:46

A&Ms

23-Dec-09 3:46

Hi I have written a Dialog based Application in VC++ 2008 and also I made some Modeless Dialogs which are created in response of Button Click.

I want my parent Dialog (main Dialog) to be notified of Child Dialog's destroy so I use the below code But It doesn't do any thing while child dialog is closed or destroyed.

void CMyAppDlg::OnParentNotify(UINT message, LPARAM lParam)
{
	
	CDialog::OnParentNotify(message, lParam);

	
	if ((LOWORD(message) == WM_DESTROY)) 	
	{
		if((HWND)lParam == _mChildDlg->m_hWnd){
			::AfxMessageBox(_T("My Code here")); 
                }
	}
}

Re: Modeless Child Dialog Detection in Parent Dialog

JudyL_MD23-Dec-09 4:00

JudyL_MD

23-Dec-09 4:00

How does the child dialog tell the parent it is closing? It won't happen automatically.

Judy

Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein

Re: Modeless Child Dialog Detection in Parent Dialog

A&Ms23-Dec-09 4:07

A&Ms

23-Dec-09 4:07

According to the MSDN CWnd::OnParentNotify

A parent's OnParentNotify member function is called by the framework when its child window is created or destroyed, or when the user clicks a mouse button while the cursor is over the child window.

So I think It should work. if not so what should I do?

Re: Modeless Child Dialog Detection in Parent Dialog

Nelek23-Dec-09 5:13

Nelek

23-Dec-09 5:13

From the same link you have given...

[quote]
All child windows except those that have the WS_EX_NOPARENTNOTIFY style send this message to their parent windows. By default, child windows in a dialog box have the WS_EX_NOPARENTNOTIFY style unless the child window was created without this style by calling the CreateEx member function.
[/quote]

How do you create your child dialog?

Regards.
--------
M.D.V. Wink | ;)

Re: Modeless Child Dialog Detection in Parent Dialog

A&Ms23-Dec-09 9:41

A&Ms

23-Dec-09 9:41

Thanks I think that should works

Re: Modeless Child Dialog Detection in Parent Dialog

Nelek23-Dec-09 23:00

Nelek

23-Dec-09 23:00

You are welcome Smile | :)

Regards.
--------
M.D.V. Wink | ;)

Deployment In C++

jannathali23-Dec-09 2:02

jannathali

23-Dec-09 2:02

Hai,
I am having a VC++ exe. i wat to create a setup file, I tried creating a setupfile by reading the msdn site.when i am running it, it is working in some machines, but not in other machines. will you please help me

Re: Deployment In C++

Nelek23-Dec-09 2:31

Nelek

23-Dec-09 2:31

Are you making the setup from your debug or your release version?

If you are making it from debug, it probably is the reason why in some machines does not work. They probably are machines where visual studio is not installed, and so your program is missing the needed libraries and dlls to be able to run the application.

What error do it appears in the machines where it is not working?

Regards.
--------
M.D.V. Wink | ;)

Re: Deployment In C++

jannathali23-Dec-09 2:45

jannathali

23-Dec-09 2:45

i Am making it from the debug version.It is showing the error Application Not configuredf properly.Try reinstalling it.

Re: Deployment In C++

Nelek23-Dec-09 3:06

Nelek

23-Dec-09 3:06

As I said, if you do the setup from the debug version and you try to run the application in a machine where no visual studio is installed... you may have problems. The debug versions sometimes need to have some DLLs and other files in the target computer to run correctly.

Take a look with the dependancy-walker about what your programm needs when it is running and add it to the setup packet.

Or do the setup with released version. If you do this, I strongly recommend to take a look into:

Surviving the Release Version[^]
Debugging Release Mode Problems[^]

Regards.
--------
M.D.V. Wink | ;)

Re: Deployment In C++

Abhi Lahare23-Dec-09 4:36

Abhi Lahare

23-Dec-09 4:36

Are you including visual studio runtime library in your setup? The Target machine may not have these files

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