C / C++ / MFC Discussion Boards

amit sebiz29-Jan-04 2:48

29-Jan-04 2:48

How can i redarw controls(with changed co ordinates) in a MFC Application, once i have detected that resolution has changed??

Re: Redrawing Controls??????

Luuk Weltevreden29-Jan-04 3:16

Luuk Weltevreden

29-Jan-04 3:16

Call the RedrawWindow function on the top level window with atleast the parameters RDW_INVALIDATE and RDW_ALLCHILDREN. It will step through all child windows itself and make sure every child window gets redrawn. Then again, if the resolution has changed don't all windows get a WM_PAINT message automatically?

it doesn't seem to work??????

amit sebiz29-Jan-04 4:58

amit sebiz

29-Jan-04 4:58

thanx Luuk,

But it doesn't seem to work. Can u elaborate on it by an example.

Re: it doesn't seem to work??????

Luuk Weltevreden29-Jan-04 6:06

Luuk Weltevreden

29-Jan-04 6:06

Sure, it's quite simple:

LRESULT CMyFrameWnd::OnDisplayChange(WPARAM wParam, LPARAM lParam)
{
    // cBitsPerPixel = wParam;
    // cxScreen = LOWORD(lParam);
    // cyScreen = HIWORD(lParam);

    // Redraw the window and its children
    RedrawWindow(NULL, NULL, RDW_INVALIDATE | RDW_ERASE | RDW_ALLCHILDREN | RDW_UPDATENOW);

    // Pass it on to the base class
    return CFrameWnd::OnDisplayChange(wParam, lParam);
}

This should do the trick, if it doesn't then I suppose something else is going on.

file problem

styve29-Jan-04 2:47

styve

29-Jan-04 2:47

Hi!

I have a problem with saving packets to a file. A packet loss occur at time XXYY. Then I will name open a file name it to XXYY, store some packets, and then close the file. Next time a packet is losses I will open a new file with the name as time HHMM. But it will not work. It cannot open the file.
Does anyone know how to do it???

Im store the time in a char buffer, and then I copy it into char Filename[20].

My code:

void WriteToFile()
{
strcpy(Filename, time[line])
ofstream outFile;
outFile.open(Filename, ios::out);

if(!outFile){cout << "cant open file"<

Re: file problem

valikac29-Jan-04 6:18

valikac

29-Jan-04 6:18

Add some breakpoints. Determine why the program cannot create the file.

Kuphryn

Re: file problem

Robert A. T. Káldy29-Jan-04 10:06

Robert A. T. Káldy

29-Jan-04 10:06

Ouuuuch! Trying to check statically declared ofstream for errors by if (!outfile)?????
Use if (outfile.fail()) { ... } Smile | :)

)

Robert-Antonio

"I launched Norton Commander and saw, drive C: on the left,
drive C: on the right...Damn, why I need two drives C:??? So I formatted one..."

ToolBar & StatusBar

edwinak29-Jan-04 2:13

edwinak

29-Jan-04 2:13

Hi
Is it possible to add toolbar and statusbar to an dialogbased application?

WBR
Edi

Re: ToolBar & StatusBar

Dominik Reichl29-Jan-04 3:31

Dominik Reichl

29-Jan-04 3:31

Sure.

See:
http://www.codeproject.com/statusbar/dlgstatbar01.asp
http://www.codeproject.com/docking/display_dialog_tooltips.asp

Smile | :)

Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Small problem with virtual function in DLL class...

vmaltsev29-Jan-04 1:23

vmaltsev

29-Jan-04 1:23

Hi everyone,

I have class A in DLL with virtual function in it, like this...

<br />
class __declspec(dllexport) A {<br />
public:<br />
    vitual void Foo() { some code; };<br />
}<br />

And there is derived class B in the same DLL...

<br />
class __declspec(dllexport) B : public A {<br />
public:<br />
    vitual void Foo() { some code; };<br />
}<br />

Now, when I compile it, everything's ok. But I also have a console app where I create instances of class B from DLL. Of course I link .lib file with it. But when I try to compile this app I have an error from linker.
error LNK2001: unresolved external symbol "public: virtual void __thiscall B::Foo(void)"

Does anybody have any ideas how to solve this matter?

P.S. When I check EXPORTS from my DLL with dumpbin.exe, I can see both methods there. So, ?FooA@A@@ and ?FooA@B@@ are there. But linker's looking for ?Foo@B@@, without "A" at the end of the method name and obviously can't find it.
Any idea what's wrong?

Thanks in advance,
va'Lery

Re: Small problem with virtual function in DLL class...

Mike Dimmick29-Jan-04 1:50

Mike Dimmick

29-Jan-04 1:50

This is, I admit, a guess.

When included by the application, is it marked __declspec(dllimport)?

You should normally write your header as follows:

#ifdef BUILDING_DLL
#define MYDLL_API __declspec(dllexport)
#else
#define MYDLL_API __declspec(dllimport)
#endif // def BUILDING_DLL

class MYDLL_API A { /* declarations omitted */ };
class MYDLL_API B : public A { /* declarations omitted */ };

and define BUILDING_DLL in the DLL project.

I'm not sure how well __declspec(dllexport) interacts with in-line member function definitions.

Re: Small problem with virtual function in DLL class...

vmaltsev29-Jan-04 2:02

vmaltsev

29-Jan-04 2:02

Thanks Mike,

I surely use mechanics that you described, so in my app I have __declspec(dllimport). Smile | :)

Concerning inline function, if I remove "virtual" when everything's fine. But that's not what I need. I have to use virtual function there.

va'Lery

how to place a GIF file on Dialog .. and in rich edit control

Anonymous29-Jan-04 1:20

Anonymous

29-Jan-04 1:20

hi.

Plz tell me how can i place a GIF file on a Dialog ,, and in a rich edit control

thanx

Re: how to place a GIF file on Dialog .. and in rich edit control

Scozturk29-Jan-04 1:35

Scozturk

29-Jan-04 1:35

Hi!
GIF and JPEG files cannot be used in your application because they are copyrighted by their developpers.
As a solution you may put a webbrowser control and show the gif file in it ( you put it in a html file and it is done).
I hope this helps!

Well... I am a beginner ...

Re: how to place a GIF file on Dialog .. and in rich edit control

sstoyan29-Jan-04 2:27

sstoyan

29-Jan-04 2:27

read about GDI+
it supports various graphics file formats, and is quite easy to use (for simple things Smile | :)

here's a quick plan:

1. initialize gdi+
2. initialize an Image from file (or stream)
3. initialize a Graphics object
4. display the Image through the Graphics::DrawImage()
5. deinit gdi+

well, sort of
there are many usefull examples here on codeproject

how to send Sound buffer (of DirectX Sound) Via Socket .. to my own Server

Anonymous29-Jan-04 1:17

Anonymous

29-Jan-04 1:17

I m building voice conversation application .
now i want to send SoundBuffer (of Directx) via Socket to my server.

how can i send it .. will it be lose its data .

plz help mee
thanx

Terminate another apllication

Cedric Moonen29-Jan-04 1:15

Cedric Moonen

29-Jan-04 1:15

Hello, I have a MFC application that is running (dialog based with icon in task bar).

I want to terminate this apllication so I post the WM_CLOSE message to the handle of the window.... But that doesn't work !!
If I post the WM_QUIT message, that works fine Confused | :confused:

Why ???

Re: Terminate another apllication

J. Eric Vaughan29-Jan-04 5:00

J. Eric Vaughan

29-Jan-04 5:00

One possibility - if the MFC dialog overrides OnClose() and doesn't call the base class's OnClose(), the dialog will not be closed.

Re: Terminate another apllication

Cedric Moonen29-Jan-04 5:07

Cedric Moonen

29-Jan-04 5:07

Huummm yes ok !! That's it.

I have a button called Close on the dialog that just hide the window. I added a handler for this command: OnClose() and this function doesn't call the base class OnClose....

Thanks for reply !! Wink | ;-)

Multiple selection in CFileDialog and CListBox

julych29-Jan-04 0:52

julych

29-Jan-04 0:52

I have enabled multiple file selection in an Open-a-File dialog.
Please tell me how to obtain (a list of) all the selected files in this Open-a-file dialog and fill CListBox control with them.

Re: Multiple selection in CFileDialog and CListBox

Diddy29-Jan-04 3:54

Diddy

29-Jan-04 3:54

Like this:

CFileDialog aDlg(...);
CListBox lb;

if(aDlg.DoModal() == IDOK)
{
POSITION pos = aDlg.GetStartPosition();
while(pos != NULL)
{
CString file = aDlg.GetNextPathName(pos);
lb.AddString(file);
}
}

Re: Multiple selection in CFileDialog and CListBox

julych29-Jan-04 11:34

julych

29-Jan-04 11:34

Thanks a lot! It works great, but another problem is rising - if the selected files are too many (or
the string in the "file name" edit control is too long) - nothing happens - i tried to change some
of the members of the OPENFILENAME Structure, but with no result. Is it possible to make the "file
name" edit control to accept longer strings and how?

Re: Multiple selection in CFileDialog and CListBox

Diddy30-Jan-04 7:43

Diddy

30-Jan-04 7:43

No problem Smile | :)

I'm not really sure what you are asking with the second part, so I'll try to answer three things you could mean Smile | :)

1. You get a problem when you have too many files seleced in the file dialog
2. You get a problem when the file name for one of them files selected is long
3. You get a problem when adding a large number of files, or a file with a long name, to the list box.

1.

As for as I know there is no limited on the number of files you can select, I've never seen it anyway. The only problem you might get is because windows adds each file you select to the edit control, so if you select a lot you may overrun the edit control - is that what you mean? If so, see 2.

2.

Hmmm... Well, the max length of a file name is MAX_PATH (255 chars) in Windows anyway, the edit control that accepts the file list should be able to take that easily, but with a lot of files it concevable you will overrun it.

The only thing I can suggest is to use the "explorer style" file dialog (the one with the places bar down the side) this may be able to handle a large list of files better. Though you are now faced with another problem. Using the explorer dialog via MFC is tricky. You have to set define _WIN32_WINNT >= 0x0500 (which also means this will only work on 2k+) but thats not all there is to it because the setting this define adds some extra members to the OPENFILENAME struct which cause windows to display the explore style dialog rather than the new one. Unfotunatly, the size of OPENFILENAME is set with in MFC and short of recompiling MFC dlls, you are stuck with it. There are ways round it, search for OPENFILENAME on MSDN and look for 2000 Peridocal (called C++ Q AND A) buy Paul DiLascia. It's called "Windows 2000 File Dialog Revisited; Autocompletion and the ACTest Demo App" and it will show you how to use the new open dialog which might fix your problem. Of course if it doesn't, then.. err.. Smile | :)

The other thing it might be is this:

FIX: Common File Dialog Multiple Selection File Limit : Q179372

But this has aparently been fixed in a service pack. WHat version you running?

3.

If this is your problem you are hitting a limit with the number of entrys a list box can handle, use a CListCtrl instead.

Problem with VK_NUMLCOCK and VK_INSERT

svincent29-Jan-04 0:39

svincent

29-Jan-04 0:39

Hi !
I'm trying in one of my listCtrl to implement a insert line function with the taste Insert.
But it appears that the "OnKeyDown" event doesn't work with that key when the NUM_LOCK key is on.
In that case, the Parameter nChar of the funtion OnkeyDown is always 255, and I can´t detect wich key has been pushed down. Couls someone gives me a tip ?

Tanks !!
Sébastien

Sébastien.V

Re: Problem with VK_NUMLCOCK and VK_INSERT

ohadp29-Jan-04 6:27

ohadp

29-Jan-04 6:27

try using GetAsyncKeyState()

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.