C / C++ / MFC Discussion Boards

Martin Ziacek27-May-02 1:48

27-May-02 1:48

Problem is, that MFC works well within MFC application. Your shell extension is running under explorer.exe and that's not MFC application. DoModal() function can fail for two reasons - cannot locate resources or it is not happy with your main window - explorer window. I had similar problem and I finished with writing my own DoModal() function. I can send it to you this evening, if you want. Try to debug DoModal(), to find out, where it fails.

Re: ATL/COM + MFC: Dialogs?

Dominik Reichl27-May-02 1:51

Dominik Reichl

27-May-02 1:51

No, i will not try to debug it anymore. I tried it about 2 hours. Enough now Smile | :)

Perhaps i create a new MFC DLL containing the dialog.... i need the MFC functions in my program. But you may send me your DoModal() version.

thanks for your help
-Dominik

Re: ATL/COM + MFC: Dialogs? - this is very long message

Martin Ziacek27-May-02 8:38

Martin Ziacek

27-May-02 8:38

This is my class, which should help you. It uses my CSeException class from this site. Note, you must pass handle of your main window to DoModal() function.

class CDominikDlg : public CDialog
{
// Construction
public:
CDominikDlg(DWORD dwID, CWnd* pParent = NULL); // standard constructor

// Dialog Data
//{{AFX_DATA(CDominikDlg)
//}}AFX_DATA

MSG m_msgCur;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CDominikDlg)
public:
virtual int DoModal(HWND hWndParent);
virtual int RunModalLoop(DWORD dwFlags = 0);
virtual BOOL PumpMessage(void);
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
CFont m_font;
// Generated message map functions
//{{AFX_MSG(CDominikDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

#define WM_KICKIDLE 0x036A // (params unused) causes idles to kick in

CDominikDlg::CDominikDlg(DWORD dwID,CWnd* pParent /*=NULL*/)
: CDialog(dwID, pParent)
{
//{{AFX_DATA_INIT(CDominikDlg)
//}}AFX_DATA_INIT
m_font.CreateFont(8, 6, 0, 0, FW_THIN, 0, 0, 0, DEFAULT_CHARSET,
OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY,
DEFAULT_PITCH | FF_DONTCARE, _T("Courier New"));
}

void CDominikDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CDominikDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDominikDlg, CDialog)
//{{AFX_MSG_MAP(CDominikDlg)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDominikDlg message handlers

int CDominikDlg::DoModal(HWND hWndParent)
{
// can be constructed with a resource template or InitModalIndirect
ASSERT(m_lpszTemplateName != NULL || m_hDialogTemplate != NULL ||
m_lpDialogTemplate != NULL);

// load resource as necessary
LPCDLGTEMPLATE lpDialogTemplate = m_lpDialogTemplate;
HGLOBAL hDialogTemplate = m_hDialogTemplate;
HINSTANCE hInst = g_hDll;

HINSTANCE hinTmp = afxCurrentInstanceHandle;
HINSTANCE hresTmp = afxCurrentResourceHandle;
afxCurrentResourceHandle = g_hDll;
afxCurrentInstanceHandle = g_hDll;

if (m_lpszTemplateName != NULL) {
HRSRC hResource = ::FindResourceEx(g_hDll,RT_DIALOG,m_lpszTemplateName,MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL));
hDialogTemplate = LoadResource(hInst, hResource);
}
if (hDialogTemplate != NULL)
lpDialogTemplate = (LPCDLGTEMPLATE)LockResource(hDialogTemplate);

// return -1 in case of failure to load the dialog template resource
if (lpDialogTemplate == NULL)
return -1;

// disable parent (before creating dialog)
//HWND hWndParent = PreModal();
//AfxUnhookWindowCreate();
BOOL bEnableParent = FALSE;
if (hWndParent != NULL && ::IsWindowEnabled(hWndParent)) {
::EnableWindow(hWndParent, FALSE);
bEnableParent = TRUE;
}

try {
// create modeless dialog
//AfxHookWindowCreate(this);
if (CreateDlgIndirect(lpDialogTemplate,
CWnd::FromHandle(hWndParent), hInst)) {
if (m_nFlags & WF_CONTINUEMODAL) {
// enter modal loop
DWORD dwFlags = MLF_SHOWONIDLE;
if (GetStyle() & DS_NOIDLEMSG)
dwFlags |= MLF_NOIDLEMSG;
VERIFY(RunModalLoop(dwFlags) == m_nModalResult);
}

// hide the window before enabling the parent, etc.
if (m_hWnd != NULL)
SetWindowPos(NULL, 0, 0, 0, 0, SWP_HIDEWINDOW|
SWP_NOSIZE|SWP_NOMOVE|SWP_NOACTIVATE|SWP_NOZORDER);
}
} catch(CSeException *e) {
DUMPEXCEPTION(e);
::SetLastError((unsigned long)NTE_FAIL);
e->Delete();
} catch (...) {
TRACE(_T("%s(%d): Unknown exception.\n"),__FILE__,__LINE__);
m_nModalResult = -1;
}

if (bEnableParent)
::EnableWindow(hWndParent, TRUE);

if (hWndParent != NULL && ::GetActiveWindow() == m_hWnd)
::SetActiveWindow(hWndParent);

// destroy modal window
DestroyWindow();
PostModal();

// unlock/free resources as necessary
if (m_lpszTemplateName != NULL || m_hDialogTemplate != NULL)
UnlockResource(hDialogTemplate);

if (m_lpszTemplateName != NULL)
FreeResource(hDialogTemplate);

afxCurrentInstanceHandle = hinTmp;
afxCurrentResourceHandle = hresTmp;

return m_nModalResult;
}

int CDominikDlg::RunModalLoop(DWORD dwFlags)
{
ASSERT(::IsWindow(m_hWnd)); // window must be created
ASSERT(!(m_nFlags & WF_MODALLOOP)); // window must not already be in modal state

// for tracking the idle time state
BOOL bIdle = TRUE;
LONG lIdleCount = 0;
BOOL bShowIdle = (dwFlags & MLF_SHOWONIDLE) && !(GetStyle() & WS_VISIBLE);
HWND hWndParent = ::GetParent(m_hWnd);
m_nFlags |= (WF_MODALLOOP|WF_CONTINUEMODAL);
MSG* pMsg = &m_msgCur;

// acquire and dispatch messages until the modal state is done
for (;;) {
ASSERT(ContinueModal());

// phase1: check to see if we can do idle work
while (bIdle &&
!::PeekMessage(pMsg, NULL, NULL, NULL, PM_NOREMOVE)) {

ASSERT(ContinueModal());

// show the dialog when the message queue goes idle
if (bShowIdle) {
ShowWindow(SW_SHOWNORMAL);
UpdateWindow();
bShowIdle = FALSE;
}

// call OnIdle while in bIdle state
if (!(dwFlags & MLF_NOIDLEMSG) && hWndParent != NULL && lIdleCount == 0) {
// send WM_ENTERIDLE to the parent
::SendMessage(hWndParent, WM_ENTERIDLE, MSGF_DIALOGBOX, (LPARAM)m_hWnd);
}
if ((dwFlags & MLF_NOKICKIDLE) ||
!SendMessage(WM_KICKIDLE, MSGF_DIALOGBOX, lIdleCount++)) {
// stop idle processing next time
bIdle = FALSE;
}
}

// phase2: pump messages while available
do {
ASSERT(ContinueModal());

// pump message, but quit on WM_QUIT
if (!PumpMessage()) {
AfxPostQuitMessage(0);
return -1;
}

// show the window when certain special messages rec'd
if (bShowIdle &&
(pMsg->message == 0x118 || pMsg->message == WM_SYSKEYDOWN)) {
ShowWindow(SW_SHOWNORMAL);
UpdateWindow();
bShowIdle = FALSE;
}

if (!ContinueModal())
goto ExitModal;

} while (::PeekMessage(pMsg, NULL, NULL, NULL, PM_NOREMOVE));
}

ExitModal:
m_nFlags &= ~(WF_MODALLOOP|WF_CONTINUEMODAL);
return m_nModalResult;
}

BOOL CDominikDlg::PumpMessage()
{
ASSERT_VALID(this);

if (!::GetMessage(&m_msgCur, NULL, NULL, NULL)) {
return FALSE;
}

// process this message
if (m_msgCur.message != WM_KICKIDLE && !PreTranslateMessage(&m_msgCur)) {
::TranslateMessage(&m_msgCur);
::DispatchMessage(&m_msgCur);
}
return TRUE;
}

Returning a refrence from a function

Abhishek Narula27-May-02 0:08

Abhishek Narula

27-May-02 0:08

Hi there ,
I have a class lets say CMyClass, it contains a member variable of type CArray of lets say int.

Now I have a public function of this Class GetValue(int nIndex) now this function returns the Reference of int which is actually a reference to a particular index of my CArray type member variable.

Now here is the problem .. My GetValue function performs some checks before returning the Refrence . now in case the checks fails I dont want to return the reference .. in that case WHAT DO I RETUNR FROM MY CODE.

does any body understand what I am trying to ask ?

Abhishek Narula

"Learn to appreciate others ... World would appreciate you"

Re: Returning a refrence from a function

markkuk27-May-02 0:18

markkuk

27-May-02 0:18

Throw an exception. There's no reference equivalent of a NULL pointer, so you must either return a valid reference or throw.

Re: Returning a refrence from a function

Abhishek Narula27-May-02 0:25

Abhishek Narula

27-May-02 0:25

Wonderfull Idea !! thanks .. please tell me more about throwing exceptions also ..

Abhishek Narula

"Learn to appreciate others ... World would appreciate you"

Re: Returning a refrence from a function

Joaquín M López Muñoz27-May-02 0:14

Joaquín M López Muñoz

27-May-02 0:14

Throw an exception.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Returning a refrence from a function

Abhishek Narula27-May-02 0:24

Abhishek Narula

27-May-02 0:24

Hmm that seems a better idea .. please throw some light on thoring exceptions also ..

Abhishek Narula

"Learn to appreciate others ... World would appreciate you"

Re: Returning a refrence from a function

Joaquín M López Muñoz27-May-02 0:28

Joaquín M López Muñoz

27-May-02 0:28

Essentially, you just throw with throw, which interrupts the normal flow of execution and throws an object that can be catched by some point up the call stack with catch.
Just read your docs for throw and catch, and/or search some tutorial on the net, sure there're many out there.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Returning a refrence from a function

Alexandru Savescu27-May-02 1:17

Alexandru Savescu

27-May-02 1:17

It goes like this:

1. Create a class CMyException. Here is an example:

class CMyException
{
  CString strError;
public:
  CMyException (CString& a) : strError (a) {} 
  void HandleError ()
  {
    AfxMessageBox (strError);
  }
}

2. Do this in that function:

if (index_is_out_of_bounds)
  throw CMyException ("Index out of bounds"); // throw the exception

3. Catch the exception like this:

try
{
  // call the function that may throw the exception
}
catch (CMyException& e)
{
  // caught an exception and now handle it
  e.HandleError ();
  return;
}

You can also check MSDN for details or download a good C++ book. "Thinking in C++" from www.bruceeckel.com

Best regards,
Alexandru Savescu

Setting up Size for CFormView

sanskypotov27-May-02 0:00

sanskypotov

27-May-02 0:00

Hi,
Can someone please tell me how can I set the size for a
CFormView, say if I want to set size to ( 1000, 1000 ).
Thanks,
Sansky Big Grin | :-D

John 3:16

For God so loved the world,

that he gave his only begotten Son ( Jesus Christ ) ,

that whosoever believeth in him should not perish, but have everlasting life.

Re: Setting up Size for CFormView

Joaquín M López Muñoz27-May-02 0:00

Joaquín M López Muñoz

27-May-02 0:00

Use MoveWindow and then ResizeParentToFit.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Setting up Size for CFormView

Roger Allen27-May-02 4:51

Roger Allen

27-May-02 4:51

In the view call SetScaleToFitSize()

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

DdeClientTransaction() problem..

Neha26-May-02 23:38

Neha

26-May-02 23:38

Hi,
I am trying to open a html file. for this i use DDE.
My DdeClientTransaction() call is as follows.
DdeClientTransaction( 0,
0,
hConv,
hItem,
CF_TEXT,
XTYP_REQUEST,
5000,
&dwResult )

It works fine, if the path for html file doesn't contain a space.
Could anyone knows how to make it work if the path contains a space in it?

Regards
Neha

looks good?

Nnamdi Onyeyiri26-May-02 23:25

Nnamdi Onyeyiri

26-May-02 23:25

http://www.discreet.com/onlinetours/max/html/ui_pages/custom1.gif

I am making an interface that will look like that, except with lighter greys, worth the effort?

==================================================
When Your Mind Wonders...Where Does It Go???

Re: looks good?

Paul M Watt27-May-02 6:04

Paul M Watt

27-May-02 6:04

I think that the first question that you should ask is who is the audience that you are developing your program for? I do not think that that interface looks so cluttered, so it may be a good one to follow. I guess the people at 3D Studio Max have had success with that interface so it probably would not hurt you to follow it.

One more thing to keep in mind, the more complicated that you make your interface the more advanced the user will need to be.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: looks good?

Ed Gadziemski1-Jun-02 11:44

Ed Gadziemski

1-Jun-02 11:44

It's kind of hard to read for old folks like me. Hopefully you'll use more contrast instead of black and dark gray.

BTW, on your sig, is the word "Wonders" correct or should it be "Wanders"? Wanders would make more sense to me.

Insert and eject cd-rom by sendaspi32command?

chen26-May-02 21:11

chen

26-May-02 21:11

Deal all,

In a dialog-based application, i have detect all the cd-rom devices
successfully. Now i want to insert and eject a cd-rom.
How to insert and eject a cd-rom by using sendAspi32Command ?

Thanks in advance!

chen

Re: Insert and eject cd-rom by sendaspi32command?

Mike Nordell27-May-02 21:14

Mike Nordell

27-May-02 21:14

Have a look at the source for CDRecord.

BMP - GIF

Sameer Maggon26-May-02 21:06

Sameer Maggon

26-May-02 21:06

Hi,
I have a 24bit BMP and want to programatically convert
it to GIF file.

How do i do that
Sameer

Re: BMP - GIF [corrected]

Joaquín M López Muñoz27-May-02 0:17

Joaquín M López Muñoz

27-May-02 0:17

Use any of the varios graphics libraries available on the net. For one, paintlib seems a good choice.

PS: Seems paintlib does not output GIFs, probably because of the patents problems associated with this format. If you can switch to PNG then the library will serve your needs.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: BMP - GIF [corrected]

Sameer Maggon27-May-02 0:54

Sameer Maggon

27-May-02 0:54

Joaquín M López Muñoz wrote:
If you can switch to PNG then the library will serve your needs.

Actually, I have a 24 bit BMP and I want a format, which
converts it to a Browser Compatible format and its
size is the smallest.

Wha about the size of PNGs

Sameer

Re: BMP - GIF [corrected]

Joaquín M López Muñoz27-May-02 2:42

Joaquín M López Muñoz

27-May-02 2:42

If you're outputting synthetic images (chart diagrams, simple icons), then PNG is fine. For all other things, specially photographies, JPEG is a much better choice.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

ISO9660 FS

yamini26-May-02 20:47

yamini

26-May-02 20:47

Hi all,

I have to develop a ISO9660 File System in windows NT platform.I have dowmloaded the mkisofs whihc is written mainly for UNIX.How can i use this code for windows.Also, if somebody had already worked in this code meand how can we use this code(can u explain how the exe works& how we have to give the args at command line).Is any config file used.

I tried going thro the docs for this.But, cuold not succeed in creating the file system..

TIA.

Re: ISO9660 FS

Mike Nordell27-May-02 21:26

Mike Nordell

27-May-02 21:26

From your explanation it sounds like what you try to accomplish is to write an ISO-9660 image. The file system driver for it is already provided by Microsoft. Smile | :)

You are right that mkisofs is written mainly for *nix, but it's works almost as good on Win32 (perhaps/probably equally well is compiled under cygwin). The tiny problem is with inodes used for hashing, why recursing directory trees can be a bit strange.

As for the syntax of how you invoke mkisofs, have you read any of the docs included? Let's say you want to create an image where the "volume name" is to be "Mush" and it is to be only used on Windows why a an additional Joliet directory but no Rock Ridge directory would suffice, and that CD is to have two files "foo" and "bar" in the root, and finally the image file is to be named barf.img.

mkisofs -V Mush -J -o barf.img foo bar

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