C / C++ / MFC Discussion Boards

VS Palani8-Feb-04 17:09

8-Feb-04 17:09

Hi,

I'm using CHtmlEditView/CHtmlEditDoc in VC 6.0. It's working well but in testing I found one bug and I could not trace it out yet. i.e. In some times while the user working with editor, suddenly the view becomes blank and the source file size becomes zero. Still I could not find which action makes it blank, I could not trace it out.

Kindly help, what could be the problem to make the entire file blank and is there any chance to happen this in edit/view mode of CHtmlEditView/Doc?
Is anybody hit with this problem?

Very thanks.

Regards,
Palani VS

MFC release mode, list control & bitmaps

User 5838528-Feb-04 16:43

User 583852

8-Feb-04 16:43

I have a bitmap in my app that contains two icons.
I load the bitmap into an image list and associate it with a list control
During run time I set the bitmap list this

LV_ITEM lvItem;

lvItem.mask = LVIF_IMAGE;
lvItem.iItem = itemIndex;
lvItem.iImage = imageIndex;
m_listTest.SetItem(&lvItem);

where imageIndex is 0 or 1

In debug mode this works fine I can swap between icons no worries but in release mode I always get the icon at position 0 no matter what imageIndex is set to!

Im so sick of release problems with MFC. Can anyone help.

Help with WMI

Badut8-Feb-04 16:18

Badut

8-Feb-04 16:18

I'm currently trying to obtain some information about my mother board using WMI in VC++6. I've had a read of the MSDN documenation on the Win32_BaseBoard class but I'm still not sure of how WMI all works. Would someone who knows a bit about WMI please provide some code samples to get me started.

Much appreciated.

Re: Help with WMI

David Crow9-Feb-04 6:06

David Crow

9-Feb-04 6:06

Here's one way:

HRESULT                 hr;
_variant_t              v;
ULONG                   ulReturned;
DWORD                   dwAuthLevel;
IWbemLocator            *pLocator;
IWbemServices           *pService = NULL;
IEnumWbemClassObject    *pEnum = NULL;
IWbemClassObject        *pClass;
 
hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *) &pLocator);
if (S_OK == hr)
{
    hr = pLocator->ConnectServer(_bstr_t(L"root\\cimv2"), NULL, NULL, NULL, NULL, 0, NULL, &pService);
    if (WBEM_S_NO_ERROR == hr)
    {
        hr = CoQueryProxyBlanket(pService, NULL, NULL, NULL, &dwAuthLevel, NULL, NULL, NULL);
        hr = CoSetProxyBlanket(pService, RPC_C_AUTHN_DEFAULT, RPC_C_AUTHZ_NONE, NULL, dwAuthLevel, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE);
 
        hr = pService->CreateInstanceEnum(_bstr_t("Win32_Baseboard"), WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY, NULL, &pEnum);
        if (WBEM_S_NO_ERROR == hr)
        {
            do
            {
                hr = pEnum->Next(WBEM_INFINITE, 1, &pClass, &ulReturned);
                if (WBEM_S_NO_ERROR == hr)
                {
                    hr = pClass->Get(L"Caption", 0, &v, NULL, NULL);
                    if (VT_NULL != v.vt)
                        TRACE("Caption = %S\n", V_BSTR(&v));                            
                
                    hr = pClass->Get(L"ConfigOptions", 0, &v, NULL, NULL);
                    if (VT_NULL != v.vt)
                    {
                        LONG lBound;
                        BSTR Value;
                        SafeArrayGetUBound(V_ARRAY(&v), 1, &lBound);
                        while (lBound >= 0)
                        {
                            SafeArrayGetElement(V_ARRAY(&v), &lBound, &Value);
                            TRACE("ConfigOptions[%u] = %S\n", lBound, Value);
                            lBound--;
                        }
                    }
 
                    hr = pClass->Get(L"Depth", 0, &v, NULL, NULL);
                    if (VT_NULL != v.vt)
                        TRACE("Depth = %f\n", V_R4(&v));
 
                    pClass->Release();
                }
            } while (WBEM_S_NO_ERROR == hr);
 
            pEnum->Release();
        }
 
        pService->Release();
    }
 
    pLocator->Release();
}

A rich person is not the one who has the most, but the one that needs the least.

Silly little template question

Ravi Bhavnani8-Feb-04 13:51

Ravi Bhavnani

8-Feb-04 13:51

I have a template Collection class defined as so (only a small portion of the class is shown here):

template < class T >
class Collection
{
  public:
    //! Constructs an empty Collection.
    Collection();
    //! Standard destructor
    virtual ~Collection();

  /* Operations */
  public:
    //! Stores an object by appending it to the collection.
    //! @param    pObject   Pointer to object.
    //! @return   The index of the added object.
    long add (T* pObject);

    //! Returns the object at a specific location in the collection.
    //! @param    nIndex    Location index.
    //! @return   A pointer to the object at the specified location.
    T* getAt (long nIndex);

    ...
}

I declare an instance of a Collection like so:

Collection< Foo > m_collectionOfFooObjects;

My project compiles fine, but I get several unresolved symbol link errors, one for each Collection method that returns a T* or void. The linker seems to have no problem finding methods that return long (eg: add()). I'm sure I'm doing something wrong but can't figure out what. Confused | :confused:

Any help would be appreciated. Thanks!

(PS: The Collection class does more than store a collection of objects, hence it's more convenient to brew my own than use an STL or MFC object.)

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

Re: Silly little template question

Tim Smith8-Feb-04 14:56

Tim Smith

8-Feb-04 14:56

Where are these functions declared? They can not be placed in a cpp file. They must be in with the H file.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Silly little template question

Ravi Bhavnani8-Feb-04 15:05

Ravi Bhavnani

8-Feb-04 15:05

Yes, they're in a .cpp file. Drat, I wanted to hide their implementation from the user, but I guess that may not be easy/possible.

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

Re: Silly little template question

Taka Muraoka8-Feb-04 16:24

Taka Muraoka

8-Feb-04 16:24

Ravi Bhavnani wrote:
guess that may not be easy/possible.

Not possible (since templates are a compile-time thing). There was a bit of talk a while back about (proprietary) compiler extensions to allow template implementations to be hidden in a .LIB but I haven't anything about that for a while.

Lets be honest, isn't it amazing how many truly stupid people you meet during the course of the day. Carry around a pad and pencil, you'll have twenty or thirty names by the end of the day - George Carlin

Awasu 1.2.1 [^]: A free RSS reader with support for Code Project.

Re: Silly little template question

Ravi Bhavnani9-Feb-04 2:02

Ravi Bhavnani

9-Feb-04 2:02

Thanks! Nemanja's article explains why what I was trying to do won't work.

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

Re: Silly little template question

Nemanja Trifunovic8-Feb-04 18:29

Nemanja Trifunovic

8-Feb-04 18:29

No, you can't do that. Take a look at my article on this topic.[^]

Re: Silly little template question

Ravi Bhavnani9-Feb-04 2:00

Ravi Bhavnani

9-Feb-04 2:00

It's a template, not a class! Thanks, I get it now!

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

CString to unsigned long

Irish_GUI8-Feb-04 13:50

Irish_GUI

8-Feb-04 13:50

Hi,
bascially i have an IP Address contained in a CString "10.10.10.1"

i need a unsigned long representation of it.

here is the function im using below but
im not sure, if its right..
its hit and miss, works sometimes not others..

can anyone recommend an easier way of doing it
or point out errors in the function

int check1;
CString m_ipSrc;
unsigned long srcIp

check1 = convertAddress(m_ipSrc, &srcIp)

int DlgClass::convertAddress(const char *sIp, unsigned long *lIp)
{
int octets[4];
int i;
const char * auxCad = sIp;

*lIp = 0;

for(i = 0; i < 4; i++)
{
octets[i] = atoi(auxCad);
*lIp |= (octets[i] << (i*8));
auxCad = strchr(auxCad, '.');
auxCad++;
}

return 0;
}

Re: CString to unsigned long

Ravi Bhavnani8-Feb-04 14:30

Ravi Bhavnani

8-Feb-04 14:30

Perhaps this[^] article may help?

/ravi

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ravib@ravib.com

Jpystick in a MFC Program

Grahamfff8-Feb-04 10:22

Grahamfff

8-Feb-04 10:22

I have created a dialog to handle the joystick inputs, just to check that I obtain the data.
However the move joystick and joy button changed events dont seem to be firing.

BEGIN_MESSAGE_MAP(CMSCPPDlg, CDialog)
//{{AFX_MSG_MAP(CMSCPPDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_GET_STATUS, OnGetStatus)
ON_BN_CLICKED(IDC_START, OnStart)
//}}AFX_MSG_MAP
ON_MESSAGE(MM_JOY1BUTTONDOWN, OnJoy1ButtonDown)
ON_MESSAGE(MM_JOY1BUTTONUP, OnJoy1ButtonUp)
ON_MESSAGE(MM_JOY1MOVE, OnJoy1Move)
END_MESSAGE_MAP()

I start the capture via:
void CMSCPPDlg::OnStart()
{
/* This procedure starts or stops the capture of the Joystick movement and
button presses. */
static bool capture = false;
int error;
if(!capture)
{ // Start the capture
error = joySetCapture(this->m_hWnd, JOYSTICKID1, NULL, FALSE);
if (error == MMSYSERR_NODRIVER)
MessageBox("The joystick driver is not present", "Error when capturing", MB_ICONERROR);
if (error == MMSYSERR_INVALPARAM)
MessageBox("Windows 95/98/Me: Invalid joystick ID or hwnd is NULL.", "Error when capturing", MB_ICONERROR);
if (error == JOYERR_NOCANDO)
MessageBox("Cannot capture joystick input because a required service (such as a Windows timer) is unavailable.", "Error when capturing", MB_ICONERROR);
if (error == JOYERR_UNPLUGGED)
MessageBox("The specified joystick is not connected to the system. ", "Error when capturing", MB_ICONERROR);
else
{
MessageBox("The joystick has been captured");
capture = true;
}

}
else
{ // Release the Joystick capture
joyReleaseCapture(JOYSTICKID1);
capture = false;
MessageBox("The joystick has been released");
}

}

I have placed breakpoints in the OnJoy1Move & JOY1BUTTONDOWN and they are never reached.

grahamfff

Network design question

Madmaximus8-Feb-04 7:15

Madmaximus

8-Feb-04 7:15

I have a question. Which one of these is a faster network architecture: using blocking calls with a multithreaded pool or just using the asynchronous protocol? Smile | :)

How do I call a function from Cmainframe in CSampleView?

Schniddel8-Feb-04 6:34

Schniddel

8-Feb-04 6:34

Hi guys!

I have a MDI programm. and now, i want to call a function in CSampleViw which is in cmainframe. the function makes a new childframe.

how could I do that?

<br />
void CMainFrame::OnStartRenderView()<br />
{<br />
	CMDIChildWnd* pActiveChild = MDIGetActive();<br />
	CDocument* pDocument;<br />
	if (pActiveChild == NULL ||<br />
			(pDocument = pActiveChild->GetActiveDocument()) == NULL) {<br />
		TRACE("Warnung:  Kein aktives Dokument für WindowNew vorhanden\n");<br />
		AfxMessageBox(AFX_IDP_COMMAND_FAILURE);<br />
		return; // Befehl ist fehlgeschlagen<br />
	}<br />
<br />
	// Wenn nicht, haben wir einen neuen Rahmen<br />
	CDocTemplate* pTemplate =<br />
		((CSampleApp*) AfxGetApp())->m_pTemplateRender;<br />
	ASSERT_VALID(pTemplate);<br />
	CFrameWnd* pFrame =<br />
		pTemplate->CreateNewFrame(pDocument, pActiveChild);<br />
	if (pFrame == NULL) {<br />
		TRACE("Warnung:  Neuer Rahmen konnte nicht erstellt werden\n");<br />
		AfxMessageBox(AFX_IDP_COMMAND_FAILURE);<br />
		return; // Befehl ist fehlgeschlagen<br />
	}<br />
<br />
	pTemplate->InitialUpdateFrame(pFrame, pDocument);<br />
}<br />

Re: How do I call a function from Cmainframe in CSampleView?

Ravi Bhavnani8-Feb-04 14:33

Ravi Bhavnani

8-Feb-04 14:33

If I understand correctly, you want to call OnStartRenderView() from CSampleView. To do this, make sure the method is declared public in your mainframe class. Then, do this in your view class:

((CMainFrame *) AfxGetMainWnd())->OnStartRenderView();

/ravi

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MFC question

Dev5788-Feb-04 5:19

Dev578

8-Feb-04 5:19

I am programming a dialog box in MFC. Is there a way that I can have my dialog application open up a game window? For example, my dialog is the active window, and Counter Strike is alt tabbed. Is there a way that I can:

1. See if CS is alt tabbed
2. Open up CS from my dialog

I have tried using SetActiveWindow(), but I can't seem to make a pointer to CS. Any help would be great.

-Dev578

Re: MFC question

valikac8-Feb-04 6:20

valikac

8-Feb-04 6:20

When you say open up, are you referring to executing a program or set a window active?

Kuphryn

Re: MFC question

Dev5788-Feb-04 7:19

Dev578

8-Feb-04 7:19

Setting the window active. Sorry, should have been more clear. The program is already running, I just want to make it the active window.

-Dev578

Re: MFC question

Nick Parker8-Feb-04 11:14

Nick Parker

8-Feb-04 11:14

You will need to get the HWND of the other window. You can do this several ways, either by calling EnumWindows once you have defined a EnumWindowsProc callback or use FindWindow to get the HWND.

- Nick Parker
My Blog

RegEnumValue help??

YaronNir7-Feb-04 23:10

YaronNir

7-Feb-04 23:10

I am using this code

while (ERROR_SUCCESS == RegEnumValue(theSettings._rgk,dwIdx,szValueName, &dwValueNameLen,NULL,&dwType,(LPBYTE)buff,
&dwSize))
{
pairVec.push_back(std::make_pair(_bstr_t(szValueName),_bstr_t(buff)));
dwIdx++;
}

i have 5 entries in the registry, the above loop only finds the last one and
then exits.....

can any1 help?

thanks

Ask not what your application can do for you,
Ask what you can do for your application

Re: RegEnumValue help??

Michael Dunn8-Feb-04 6:15

Michael Dunn

8-Feb-04 6:15

You need to reset dwValueNameLen and dwSize to the sizes of your buffers before each call to RegEnumValue()

--Mike--
Personal stuff:: Ericahist Updated Feb 6! | Homepage
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I think so Brain, but how will we fit the hamster inside the accordion?

Re: RegEnumValue help??

YaronNir8-Feb-04 20:53

YaronNir

8-Feb-04 20:53

thanks

works like a charm

Wink | ;)

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

assertion failures

rasha20037-Feb-04 22:22

rasha2003

7-Feb-04 22:22

Hi..
i am developing an vc++ application that manage files
(copy ,move and rename)and i am useing the CFileFind
class but an error keep arise each time i make run
error name:assertion failures
in line 354 which is
void CFileFind::AssertValid() const
{
if (m_hContext == NULL)
ASSERT(m_pFoundInfo == NULL && m_pNextInfo == NULL);
else
(354) ASSERT(m_pFoundInfo != NULL && m_pNextInfo != NULL);
}

i read a bout it in the help but i still can not solve it ..
so an idea to help me..
Confused | :confused:

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