C / C++ / MFC Discussion Boards

28-Jan-01 9:22

Doesnt work, but : if i change return FALSE ; to return TRUE; the first thing i get is an debug assertion error, but NOW THE PROGRAM NAME IS VISIBLE IN THE TASK LIST Confused | :confused:

if i do return FALSE; the app immediately quits after starting.

Maybe , you could please send me an example project to andreas.kuehntopf@gmx.de

BTW : Im using Visual C++ 6.0 Professional

Re: Doesn't work BUT

28-Jan-01 9:48

Yes the retrun should be set to TRUE not FALSE as you said. Smile | :)

Apart from that everything else should be OK!

Would you just post your InitInstance() lines here?

If not, just copmare your code lines and it should be like this exactly:

BOOL CwhateverApp::InitInstance()
{
	AfxEnableControlContainer();

#ifdef _AFXDLL
	Enable3dControls();			// Call this when using MFC in a shared DLL
#else
	Enable3dControlsStatic();	// Call this when linking to MFC statically
#endif

       // These 2 lines are important! Keep them. :)
	CwhateverDlg dlg;
	m_pMainWnd = &dlg;

	// Must return true to set/keep the app active/alive! ;)
	return TRUE;

}


Remove every thing else.

Re: Hiding a Dialog

Christian Graus28-Jan-01 11:10

Christian Graus

28-Jan-01 11:10

To hide a dialog, call ShowWindow(SW_HIDE), to show it, ShowWindow(SW_SHOW)

To make it hidden on startup, call ShowWindow(SW_HIDE) in OnInitDialog.

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Re: Hiding a Dialog

28-Jan-01 11:23

Hi Christian!

This won't work coz the app class is alraedy calling the DoModal() in the InitInstance() already. Try it!

Also try my suggestion of removing the DoModal() and return TRUE in the app IninInstance() and then call the DoModal() from anywhere ealse requiring the appearnce of the dialog, it will work. Smile | :)

Re: Hiding a Dialog

28-Jan-01 23:37

No it wont work Wink | ;)

I did exacty what you said , but when trying to run i get a big bad ugly Debug Assertion Error.

The Error Message says :

Debug Assertion failed !
Program: C:\dialoghide\debug\dialoghide.exe
File: Afxwin2.inl
Line: 140

For information...[blablabla]

END RETRY IGNORE

Re: Hiding a Dialog

28-Jan-01 23:39

Hmm, i did a debug, the error is created in the file /MFC/Winmain.cpp in line 49

nReturnCode = pThread->Run();

but i wonder what all this means Big Grin | :-D

Re: Hiding a Dialog

Christian Graus29-Jan-01 11:45

Christian Graus

29-Jan-01 11:45

If you look, you'll see the error is caused by an assert that the window exists ( i.e. the window corresponding to the dialog in question. I have a program that runs in the task bar and I use the dialog as a splash screen, and hide it with a timer ( it's a dialog based app ), which is why I thought ShowWindow would work. It certainly works with a timer called after a second. I'm not sure of the way around this, but I'd suggest a Win32 program that creates the dialog manually.

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Re: Hiding a Dialog

28-Jan-01 23:39

Hmm, i did a debug, the error is created in the file /MFC/Winmain.cpp in line 49

nReturnCode = pThread->Run();

but i wonder what all this means Big Grin | :-D

Anyone got calculator source??

26-Jan-01 19:07

Can gimmi? Smile | :)

Re: Anyone got calculator source??

Christian Graus28-Jan-01 11:04

Christian Graus

28-Jan-01 11:04

If you're seriously unable to write a calculator then I would guess you're trying to get us to do your homework. In any case, there is an implimentation of a calculator in Stroustrup third ed.

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Re: Anyone got calculator source??

28-Jan-01 11:16

I wish I could give you, but coz it is part of a book, it is copyrighted and cannot be distributed w/o permit.

However, the book is Jeff Prosise 2nd edt. Windows with MFC Programming, chapter 8 and has an MFC dialog based, fully featured calc app.

If you are MFC programmer, It is good to have that book, even as a reference if you are advanced. Smile | :)

Re: Anyone got calculator source??

Suha Aktan30-Jan-01 11:19

Suha Aktan

30-Jan-01 11:19

http://www.programmersheaven.com/zone3/cat414/16076.htm

SetFocus for a child window

kk926-Jan-01 11:56

kk9

26-Jan-01 11:56

Hi

Does anyone know how to use SetFocus to set the focus for a child window in a MDI application?

Thank you for your time!

kk9

Re: SetFocus for a child window

Michael Dunn26-Jan-01 20:32

Michael Dunn

26-Jan-01 20:32

Do you just want to make a particular MDI frame active? CFrameWnd::ActivateFrame() does this.

--Mike--
http://home.inreach.com/mdunn/
Time is an illusion; lunchtime doubly so.

Re: SetFocus for a child window

kk928-Jan-01 6:54

kk9

28-Jan-01 6:54

Hi
Thanks alot for your reply. I tried it with ActivateFrame(SW_RESTORE); however, it seems to open a new child window instead of activating that present one. Do you know why?

Thanks again!

kk9 Roll eyes | :rolleyes:

Drawing line with end point

26-Jan-01 8:35

When a line is drawn in Windows, the pixel located at the ending point is always excluded.
That means if you call

dc.MoveTo(x1, y1);
dc.LineTo(x2, y2);

the line will be drawn without pixel (x2, y2).

When I draw a lot of small lines it is very noticable. I could call

dc.SetPixel(x, y, RGB(0,0,0))

but that is bad solution, because SetPixel is inefficient and I must know the color of the current pen.

Does anybody know if there is a way to draw complete line in Windows by using some special type of pen?
Maybe it is possible to rewrite line drawing algorithm at lower level?

Re: Drawing line with end point

Erik Thompson26-Jan-01 10:00

Erik Thompson

26-Jan-01 10:00

You could use the following as an alternative method

dc.MoveTo(x1,y1);
dc.LineTo(x2 + ((x2-x1 == 0 ? 0 : (x2 > x1 ? 1: -1), y2 + ((y2-y1 == 0 ? 0 : (y2 > y1 ? 1: -1));

If you are in a differnt metric other other than font (like english or inches) then you would have to adjust the 1 value to be the equivalent to the metric type.

The math works out correctly and the code should work in theory; I just haven't had the time to try it out yet. It should be quick and easy for you to check.

-Erik

Batch file deletions...

26-Jan-01 6:16

I looked around codeproject's shell article but could not find any sample on batch file deletion.

I am finding files of certain specific extension ie. *.bmp and then need to delete them by one delete button (batch deletion).

One more thing is that I have a message box and it pops up to let the user select two options:

1) Total Delete from HD.
2) Forward to the Recycle Bin only.

Code fragements, examples, hints are all much appreciated! Smile | :)

Re: Batch file deletions...

Michael Dunn26-Jan-01 8:36

Michael Dunn

26-Jan-01 8:36

Check out my article A Utility to Clean Up Compiler Temp Files which does exactly what you want - searches for files matching a wildcard and deletes them.

--Mike--
http://home.inreach.com/mdunn/
Time is an illusion; lunchtime doubly so.

Re: Batch file deletions...

26-Jan-01 9:54

Dear Mike,

Thank you for this excellent piece! Big Grin | :-D

Its all set and running! Wink | ;)

I guess there should be more tha 28 and +1 (myself now) users. (was 28 users until I put Excellent!)

Am making a joke(but)

26-Jan-01 6:11

Hi, am making a joke for a friend, a program that after 10 sec closes windows down.
But i want to make it so there is no dialog boxes or anything, but how??...
I tryed to delet some off the stuff in a MFC app wizard, no luck.

Ok, i need one more thing, how do i call the Close windows command???

Thank you all for ya help..

Re: Am making a joke(but)

26-Jan-01 9:43

For the first, look up putting an icon on the status tray, only don't draw it there, just remove it from the status bar. For the second, look up EnumWindows - you could do it something like this:

BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
char* h = new char[255];
GetWindowText(hwnd,h,255);
CString text(h);

long wl = GetWindowLong(hwnd,GWL_STYLE);

if (text.GetLength()>0 && IsWindowVisible(hwnd) &&
text != "Program Manager" )
DestroyWindow(hWnd);
return TRUE;
}

void CMyClass::CloseWindows()
{

EnumWindows(EnumWindowsProc,NULL);
}

EnumWindows calls the callback function. Usually you would make the second parameter a list or something, so you could store the names or handles of the windows being enumerated, but in this case, we just want to close them as we find them. The tests we do before closing stop us from killing everything and ensure we close just the items open on the desktop.

Now use this power for good, not evil Smile | :)

Sample code using WinEvenProc?

Tom K25-Jan-01 22:37

Tom K

25-Jan-01 22:37

I look for a sample code using the following methods: SetWinEvenHook, WinEventProc...

profiling release version

.::RockNix::.25-Jan-01 21:33

.::RockNix::.

25-Jan-01 21:33

Hi,

does anybody how to profile a release version in VC6 while the code is optimized to

maximum speed ? Or is there another (good) tool out to test the speed of functions ?

Greatings Mario ///

--------------------
www.klangwerker.de
rocknix@lycos.de
--------------------

Re: profiling release version

Matt.W.25-Jan-01 23:25

Matt.W.

25-Jan-01 23:25

I have used the MSVC profiler for release builds many times. I don't think the code optimization makes any difference at all in this matter. A couple of considerations come to mind though:
1. Make sure you turn OFF incremental linking (Visual should do this automatically)
2. Select "Line numbers only" in the Debug Info section (under C/C++ Project Settings).

At work we had a problem where the profiler menu option (under the build menu) was disabled. This is a known bug in Visual Studio! You can find information about it at the MSDN site:

http://support.microsoft.com/support/kb/articles/Q224/3/82.ASP

Hope this helps Wink | ;)

Accept that some days you are the pigeon and some days the statue.

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