C / C++ / MFC Discussion Boards

Re: C/C++ problem.

Bill Wilson22-Jul-02 8:46

Bill Wilson

22-Jul-02 8:46

You need to reference the library where the _GetItem function is implemented.

Re: C/C++ problem.

realfly22-Jul-02 15:24

realfly

22-Jul-02 15:24

you should link the .lib
if in vc, should be at "project setting"->link->object/library type in the libary name will be ok

i am realfly8)

Re: C/C++ problem.

Alexandru Savescu22-Jul-02 21:47

Alexandru Savescu

22-Jul-02 21:47

Also, if the GetItem implementation is in a C file do not forget the extern "C" stuff:

extern "C"
{
  #include "Header_in_C_That_Contains_GetItem.h"
}

Best regards,
Alexandru Savescu

CSliderCtrl help

JennyP22-Jul-02 8:31

JennyP

22-Jul-02 8:31

Hello,

I've searched the MSDN to no avail...

I've created a CSlider control on a DialogBar and am constantly getting an assertion error (hWnd is not valid) when I try to set the range (CSliderCtrl::SetRange(0, 50, FALSE)). It's as though I'm trying to set it before the slider control window is 'valid' (or created?), however, the error occurs after I see the slider physically on my DialogBar, so I know it exists at the time I try to SetRange().

If I 'ignore' the first assertion error, all subsequent executions work fine.

At what time in the code execution (standard wizard or MFC methods) may I set the slider control's parameters without error? Or does anyone know what is going wrong with this scenario? I really want to learn. Thanks!

JennyP

Re: CSliderCtrl help

benjymous22-Jul-02 22:39

benjymous

22-Jul-02 22:39

The easiest thing to do would be to put a check on the slider's hWnd member:

if( m_SliderCtrl.m_hWnd == NULL )
{
  m_SliderCtrl.SetRange(...);
}

That'll stop it asserting.
You need to make sure that the OnInitDialog member has been called first (by the framework, that is, don't call it yourself.)

I've also found that doing an UpdateData( FALSE ); call before you first access the control makes sure that the control variable is actually initialised properly

--
Help me! I'm turning into a grapefruit!

Re: CSliderCtrl help

JennyP23-Jul-02 6:45

JennyP

23-Jul-02 6:45

Thanks for the reply. I ended up calling UpdateData(FALSE) in the CMainFrame just after this dialog bar is created (and initializing other aspects such as ticks, range, etc.). It doesn't feel very like good OOD, but it's the one sure place that I can consistently initialize my DialogBar controls.

Also, I assume in the code fragment you wrote, you meant to write a != NULL instead of a == NULL?

Thanks!

JennyP

Re: CSliderCtrl help

benjymous23-Jul-02 11:10

benjymous

23-Jul-02 11:10

JennyP wrote:
Also, I assume in the code fragment you wrote, you meant to write a != NULL instead of a == NULL?

Yeah, sorry Unsure | :~

--
Help me! I'm turning into a grapefruit!

ICMP Messages

orcun colak22-Jul-02 8:14

orcun colak

22-Jul-02 8:14

I would like to see all the ICMP messages coming to my machine. I wrote the following code but I can not read anything from the socket. Where is my mistake ?

SOCKET hSocket = ::socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
while (true)
{
sockaddr_in from;
int nFromlen = sizeof(from);
int nRead = recvfrom(hSocket,pRecvBuf,1024,0,(sockaddr*)&from,&nFromlen);
}
When I ping another machine from dos prompt I expect to catch something but nothing happens and recvfrom blocks. I have admin privileges. Can someone help me on this subject please. I could not solve it.
Thank you

Orcun Colak

information for IExplorer plugins?

OmarLodhi22-Jul-02 7:50

OmarLodhi

22-Jul-02 7:50

Dear All,

is there any way to develop plugin for IExplorer. if yes then plz
if some one of you can reffer me to the materail for this help.
any code examples or any tutorial on the net.

waiting for reply.

omar lodhi

disabling menus

SilentWarrior22-Jul-02 7:38

SilentWarrior

22-Jul-02 7:38

is there a way i could disable the menus from my code
the code in msdn(july 2002) gives me a runtime exception.
thanks

looking forward from all the gurus of code

Re: disabling menus

Shog⁹22-Jul-02 12:56

Shog⁹

22-Jul-02 12:56

*ahem*
we are projects of code here... or something like that.

Anyway, could you give a few more details? Are you using MFC, or straight Win32? Do you need to disable one menu, or all of them, or just certain ones? And what have you tried (i don't have the july MSDN here)?

For reference, the functions EnableMenuItem() and potentially DrawMenuBar() will most likely be your starting point.

Shog⁹
--

Maybe Java is kind of like God, it "works in mysterious ways". It seems like your apps are running slowly, because in the backgroud Java is solving world hunger, or finding the cure to cancer.
- Ryan Johnston, Don't die java!

Re: disabling menus

SilentWarrior23-Jul-02 7:31

SilentWarrior

23-Jul-02 7:31

i have tried using
pMenu->AppendMenu(MF_STRING | MF_DISABLED, 0, "Insert");

and
the submenu pointer code

CMenu* mmenu = GetMenu();
CMenu* submenu = mmenu->GetSubMenu(4);

if (menuID == IDM_VIEW_OBJECTONLY) {
submenu->CheckMenuItem(IDM_VIEW_OBJECTONLY, MF_CHECKED | MF_BYCOMMAND);
submenu->CheckMenuItem(IDM_VIEW_PATHOBJECT,

and some thing from msdn .. which was more simpler

but all things give me one same run time error..

looking forward from all the gurus of code

Re: disabling menus

Shog⁹23-Jul-02 8:59

Shog⁹

23-Jul-02 8:59

SilentWarrior wrote:
but all things give me one same run time error

What run time error is that?

The code looks right (though cut off); if i were to guess, i'd say maybe 4 is the wrong indice for the menu you're looking for. Step through with a debugger & see what the return values are for each stage.

Shog⁹
--

gaining access to 16-bit process space ?

bisserke22-Jul-02 7:29

bisserke

22-Jul-02 7:29

hi,

I'm trying to gain access to a 16-bit app.

i'm trying something like :

::readProcessMemory(ProcHandle, (LPVOID)OffSet, buffer, BytesToRead, &BytesRead);

this doesn't work.

I did some research and it seems that all 16-bit apps operate in the same address space.
Well, ... I found a DLL (toolhelp.dll) with which I can get the Job done but only in WIN9x.

I need something to get the job done under NT too.

preferably I'm looking for a way that works equally good in all environments.

thx & greetz

I used to have a life ... now I have a computer

Launch a new instance from SDI app ?

yarp22-Jul-02 6:15

yarp

22-Jul-02 6:15

Help,
I'm trying to launch a new IE instance from a CHtmlView based SDI application.
The code is as follows:

// Get a pointer to the application object
CWinApp* pApp = AfxGetApp();

// Get the correct document template
CDocTemplate* pDocTemplate;

POSITION pos = pApp->GetFirstDocTemplatePosition();
pDocTemplate = pApp->GetNextDocTemplate(pos);

// Create the new frame
CDocument* pDoc = pDocTemplate->CreateNewDocument();
CFrameWnd* pNewFrame = pDocTemplate->CreateNewFrame(pDoc/ *GetDocument()* /,
                                                    NULL/ *(CFrameWnd*)AfxGetMainWnd()* /);
// Activate the frame and set its active view
pDocTemplate->InitialUpdateFrame(pNewFrame, NULL);

CPeachPlorerView* pView = (CPeachPlorerView*)pNewFrame->GetActiveView();

pView->SetRegisterAsBrowser(TRUE);

*ppDisp = pView->GetApplication();

Unfortunately the new frame is parented to the previous one. I think the CDocTemplate framework inherit the same CWinApp. So when I close the parent the child is closed to.

The best way would be to launch a new instance of my application, and keep a handle on it so that I can pass the IDispatch interface (ppDisp). I mean initializing the SDI from another. I've no idea on how to do this. Can somebody help me ?

Yarp

ModifyStyle

Hans Ruck22-Jul-02 6:02

Hans Ruck

22-Jul-02 6:02

What is the Win32 API equivalent of MFC's ModifyStyle?

rechi

Re: ModifyStyle

Paul M Watt22-Jul-02 6:27

Paul M Watt

22-Jul-02 6:27

LONG lStylesRemove;
LONG lStylesAdd;

//C: Get the current styles
LONG lStyle = ::GetWindowLong(hWnd, <FLAGS>);
//C: Remove the unwanted styles.
lStyle &= ~lStylesRemove;
//C: Add the new styles that you want.
lStyle |= lStylesAdd;
//C: Modify the changes back into the window.
::SetWindowLong(hWnd, lStyle);

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: ModifyStyle

Hans Ruck22-Jul-02 6:43

Hans Ruck

22-Jul-02 6:43

OK,

.
What about ModifyStyleEx? I had problems once trying the way you wrote above.

rechi

Re: ModifyStyle

Paul M Watt22-Jul-02 8:33

Paul M Watt

22-Jul-02 8:33

First off I made a mistake in the way that I called GetWindowLong. It should be called like this

::GetWindowLong(hWnd, GWL_STYLE);

and SetWindowLong like this:

::SetWindowLong(hWnd, GWL_STYLE, lStyle);

As far as the Ex styles, it should work exactly the same except that you will use the GWL_EXSTYLE flag instead.

THere is however one thing that I just thought of, if you are modifying a style that deals with the window frame, you will need to make a call to SetWindowPos in order to force the window to incorporate the new style changes into your window.

I found the code directly out of the ModifySTyle function in MFC, here is how they do it.

ASSERT(hWnd != NULL);
DWORD dwStyle = ::GetWindowLong(hWnd, nStyleOffset);
DWORD dwNewStyle = (dwStyle & ~dwRemove) | dwAdd;
if (dwStyle == dwNewStyle)
    return FALSE;

::SetWindowLong(hWnd, nStyleOffset, dwNewStyle);
if (nFlags != 0)
{
    ::SetWindowPos(hWnd, NULL, 0, 0, 0, 0,
        SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE | nFlags);
}

Good Luck

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!

classview info not accessible ???

ns22-Jul-02 5:38

22-Jul-02 5:38

I loaded a project I brought in from home into VS at work and it says classview info isnt accessible so classsview pane is unpopulated. Its not read only or anything...
Help! I need the class info.

Re: classview info not accessible ???

Renjith Ramachandran22-Jul-02 6:06

Renjith Ramachandran

22-Jul-02 6:06

just delete the .clw ,.aps,.npc from your workspace folder and open the workpace agin that will work.

Renjith-CPian.

Re: classview info not accessible ???

ns22-Jul-02 6:39

22-Jul-02 6:39

Thanks so much! This problem has been so pesky! Appreciate it,
ns

Trouble with Radio Buttons

Anonymous22-Jul-02 4:56

Anonymous

22-Jul-02 4:56

I'm making a standard MFC app with one dialog. On the dialog I have placed 2 radio buttons. When I run my program none of the radio buttons is checked. How do I make one of the default checked when I start my program?

Frown | :(

Re: Trouble with Radio Buttons

Navin22-Jul-02 5:36

Navin

22-Jul-02 5:36

Do you have a member variable set up to handle the radio buttons (through ClassWizard)? If so, in your constructor, set it to 0 or 1 in the class constructor (depending on which radio button you want checked.)

If not, you need to set up control classes for each radio button, and in the OnInitDialog function, call:
yourButtonObject.SetCheck(1);
for the button you want to have checked.

Even if you win the rat race, you're still a rat.

Re: Trouble with Radio Buttons

Renjith Ramachandran22-Jul-02 6:35

Renjith Ramachandran

22-Jul-02 6:35

make a contol variable and control variable.SetCheck(1);

Renjith-CPian.

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