C / C++ / MFC Discussion Boards

Re: SelectSinglenode syntax

toxcct17-Jul-07 5:06

toxcct

17-Jul-07 5:06

i was talking about the NULL pointer dereferencing matter...

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Re: SelectSinglenode syntax

Michael Dunn17-Jul-07 6:24

Michael Dunn

17-Jul-07 6:24

The query should be /rt/Connection/@connect
And you need to initialize pParent before using -> on it

--Mike--
Visual C++ MVP Cool | :cool:

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how to find differnce between laptop and desktop pc

Sonani Prakash17-Jul-07 4:19

Sonani Prakash

17-Jul-07 4:19

hi
any body aware how can i find whether my application is running on laptop ro desktop machine.

Please let me if any win api is available or any specific thing i can look up.

sonani prakash

Re: how to find differnce between laptop and desktop pc

Sam_c17-Jul-07 4:33

Sam_c

17-Jul-07 4:33

Using WMI Article on CP there are a few others Smile | :)

the WMI class that might contain the data your after is
Win32_ComputerSystem

there might be another.

worth a look Smile | :)

Getting value of variable from xml file

Maynka17-Jul-07 4:04

Maynka

17-Jul-07 4:04

Hi all,
i have the following xml file:

<?xml version="1.0"?>
<rt name="Remote ">
<Connection connect= "connectval" ipaddress = "ip_addresss" Port = "port_number"/>
</rt>

I want to get the value of variable connect and store it using selectsinglenode function.
how can i accomplish the above.

Regards

Re: Getting value of variable from xml file

led mike17-Jul-07 4:23

led mike

17-Jul-07 4:23

Maynka wrote:
how can i accomplish the above

you already answered the question

Maynka wrote:
using selectsinglenode

What exactly is the problem?

Re: Getting value of variable from xml file

Maynka17-Jul-07 4:28

Maynka

17-Jul-07 4:28

I am using SelectSinglenode in the following way and the code is always aborting:

IXMLDOMNodePtr pChild;
IXMLDOMNode **resultnode=NULL;
HRESULT pChild = pParent->selectSingleNode(_T("rtcs//Connection::connect"),resultnode);

i think i am not able to give the right first parameter of selectsinglenode function.

Regards

Re: Getting value of variable from xml file

CPallini17-Jul-07 4:41

CPallini

17-Jul-07 4:41

if pParent is a IXMLDOMNodePtr, then you have to do:

pChild = pParent->selectSingleNode(_T("rtcs//Connection::connect"));

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: Getting value of variable from xml file

jhwurmbach17-Jul-07 4:49

jhwurmbach

17-Jul-07 4:49

Could that be:
"//Connection/@connect"
describing any <connection> tags having a "connect" attribute?

I am not an XPATH-Guru, though.

Failure is not an option - it's built right in.

In MFC SDI,How to write D3D code?

akira3217-Jul-07 3:44

akira32

17-Jul-07 3:44

In MFC SDI,How to write D3D code?
I had wroteen some code about D3D in MFC SDI project.
But I have a problem that when I resisze the view, the model will resize.
I had reccomputed the projective matrix by the view size (when I resize the View).

I had tried to modify the projective matrix and viewport.
But it seems to be error.

HRESULT hr;
hr=m_pD3DDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_ARGB(255,0,0,0), 1.0f, 0);

m_ViewClientSize.cx=cx;
m_ViewClientSize.cy=cy;

D3DXMATRIX proj;
D3DXMatrixPerspectiveFovLH(
&proj,
D3DX_PI * 0.5f, // 90 - degree
(float)m_ViewClientSize.cx / (float)m_ViewClientSize.cy,
1.0f,
1000.0f);
if (m_pD3DDevice)
m_pD3DDevice->SetTransform(D3DTS_PROJECTION, &proj);

D3DVIEWPORT9 ViewPort;

m_pD3DDevice->GetViewport(&ViewPort);

ViewPort.Width=m_ViewClientSize.cx;
ViewPort.Height=m_ViewClientSize.cy;

if (m_pD3DDevice)
m_pD3DDevice->SetViewport(&ViewPort);

Checking is a file has been already locked...

Abhijeet Pathak17-Jul-07 3:32

Abhijeet Pathak

17-Jul-07 3:32

Hi,

how can i check, given a file name, if the file has been 'locked' by any process... either for reading, writing or both?

Thanks...

------------------------------------------------------------
Never wear anything that panics the cat.

Re: Checking is a file has been already locked...

David Crow17-Jul-07 6:39

David Crow

17-Jul-07 6:39

Can you open the file exclusively?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Checking is a file has been already locked...

Abhijeet Pathak17-Jul-07 16:48

Abhijeet Pathak

17-Jul-07 16:48

Actually, I want to check whether a file is locked by *any process*, be it my own app or any other process...
I'm aware of file locking functions when we open a file ourselves... but what about the files that are locked by some other app..?

Re: Checking is a file has been already locked...

David Crow18-Jul-07 2:31

David Crow

18-Jul-07 2:31

Abhijeet Pathak wrote:
...but what about the files that are locked by some other app..?

If a file is open by another process, and your process tried to open the file exclusively, it would fail.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Checking is a file has been already locked...

DevMentor.org17-Jul-07 6:55

DevMentor.org

17-Jul-07 6:55

do you know how to open a file and lock it yourself Poke tongue | ;-P

that might give you an idea!!!

Yours Truly, The One and Only!

Re: Checking is a file has been already locked...

Abhijeet Pathak18-Jul-07 2:07

Abhijeet Pathak

18-Jul-07 2:07

_NightOwl_ wrote:
do you know how to open a file and lock it yourself that might give you an idea!!!

Yours Truly, The One and Only!

Actually, I want to check whether a file is locked by *any process*, be it my own app or any other process...
I'm aware of file locking functions when we open a file ourselves... but what about the files that are locked by some other app..?

-------------------------------------------------
No me, no life.. know me, know life..

TopIndex Property Doesn't Change

pirat317-Jul-07 3:29

pirat3

17-Jul-07 3:29

I try setting the top index of the listbox to be anything, and it stays at zero for some odd reason. This listbox has an image under it in order to allow mouse over event. Each item's height is 13.

void __fastcall TfmMain1::lbTitlesMouseMove(TObject *Sender,
TShiftState Shift, int X, int Y)
{
int position = (ScrollBox1->VertScrollBar->Position)/13;
Label1->Caption = position;
lbVisible->TopIndex = 1;
lbTitles->TopIndex = position;
}

problem with overriding "OnIdle" method of WinApp

Banks K17-Jul-07 3:23

Banks K

17-Jul-07 3:23

Hello All,

I am overriding "virtual BOOL OnIdle(LONG lCount );" method in my application.
i think it should execute befor application start mean after initinstance and also at the idle time
but it is not executing in my application.

can any one tell me what i have to do for override this method.
please share your knowledge.

thanks
bankey

Re: problem with overriding "OnIdle" method of WinApp

Mark Salsbery17-Jul-07 6:00

Mark Salsbery

17-Jul-07 6:00

Your OnIdle never gets called?

Have you seen this? OnIdle Member Function[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

Re: problem with overriding "OnIdle" method of WinApp

Banks K17-Jul-07 21:06

Banks K

17-Jul-07 21:06

Hello, now i read that document also but i am still unable to gets called "onIdle" method can you tell what i have to do for that.

also i have another application in which, onIdle method gets called at the time of start application and end application i also i want that

please tell me where i am wrong......

Re: problem with overriding "OnIdle" method of WinApp

Mark Salsbery18-Jul-07 5:39

Mark Salsbery

18-Jul-07 5:39

If your OnIdle() override isn't getting called then I'd guess that your app is dialog based and
your main dialog is modal.

In that case, you need to use the undocumented WM_KICKIDLE message:

// Add to the dialog .h file:
  
afx_msg LRESULT OnKickIdle(WPARAM wp, LPARAM lp);
 
 
// Add to the dialog .cpp file:
 
#include <afxpriv.h> //Private MFC header - defines WM_KICKIDLE
 
// Add to the dialog's message map
ON_MESSAGE(WM_KICKIDLE,&CMyMainDlg::OnKickIdle)
 
LRESULT CMyMainDlg::OnKickIdle(WPARAM wParam, LPARAM lParam)
{
   // do your idle processing here
 
   return 0;
}

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

How to find list of connected USB devices to the system?

mss8117-Jul-07 3:21

mss81

17-Jul-07 3:21

Hi,

Can anybody tell me how to get the list of usb devices which are connected to the system? Is there any Win32 API?

How will i know the USB version and speed of my system?

Regards,
Mayuresh

Re: How to find list of connected USB devices to the system?

Matthew Faithfull17-Jul-07 3:29

Matthew Faithfull

17-Jul-07 3:29

The short answer is, not easily. You must be the 20th person to post this question or one very close to it in the last couple of months. I have code that will do this but it is part of a commercial application so I can't simply post it Frown | :(

I looks like I'll finally have to give in and write an article describing it as so many people seem to want to know. It means putting other things on hold but watch this space.

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: How to find list of connected USB devices to the system?

mss8117-Jul-07 3:41

mss81

17-Jul-07 3:41

Yes...Matthew, you should have to write an article which describes it and definately it will help others.

But at this momonet, can u atleast tell me the Win32 APIs, because I am relally stuck at this point? I used SetupDiGetClassDevs,SetupDiEnumDeviceInfo and SetupDiGetDeviceRegistryProperty APIs. but it gives all the devices. I want only USB devices connected to the system?

Please help me out...!

Re: How to find list of connected USB devices to the system?

Matthew Faithfull17-Jul-07 4:11

Matthew Faithfull

17-Jul-07 4:11

OK It sounds like you're most of the way there. You'll probably have something similar to this example this example[^] by now.

You need the GUID for USB devices, GUID_DEVCLASS_USB which lives in devguid.h which is part of the DDK. For maximum compatibility I used the one from \inc\w2k in the 3790.1803 version of the DDK which is available here[^]. You may be able to get this definition from the SDK headers these days, I'm not sure. If all you want is the USB devices of whatever type then that should be enough. If you want devices of a specific type e.g. disks then a call like this might be needed.

<br />
hIntDevInfo = SetupDiGetClassDevs (<br />
			 (LPGUID)&DiskClassGuid,<br />
			 NULL,                                   // Enumerator<br />
			 NULL,                                   // Parent Window<br />
			 (DIGCF_PRESENT | DIGCF_INTERFACEDEVICE  // Only Devices present & Interface class<br />
			 ));<br />

The device type GUIDS like DiskClassGuid come out of winioctl.h

If you get a neat solution working I suggest you write that article yourself. You'll be a CP hero in no time Big Grin | :-D

Nothing is exactly what it seems but everything with seems can be unpicked.

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