Problem with DeviceIoControl() - C / C++ / MFC Discussion Boards

How to add more than one Gif Images in MFC ActiveX Control?

ursbala29-Jan-09 19:44

29-Jan-09 19:44

Hi...
I am designing a Switch Board Panel using MFC ActiveX Control , in that I want
to add more number of Switch like Gif images .

I am able to add One Particular Gif image more number of times but I actually
want to add different Gif images to that ActiveX Controls......

So Please give me a solution.....

Regards,
Bala

Problem with NtopenFile Api in native application

Member 342050929-Jan-09 19:32

Member 3420509

29-Jan-09 19:32

I created one file suppose "abc.txt". I denied all access to all the users and groups for that file. (I did it by going to Security tab of property dialog of that file.). When I programmatically try to open this file by using API NtOpenFile() with access mask READ_CONTROL in user mode it succeeds. In this case I am opening the file in the user context who is creator owner of that file.

When I try to open the file in the context of other user who is not creator of that file NtOpenFile() fails with error "Access Denied". It may fails due to that user doesn’t have permissions.

Now when I try to open same file in native mode, NtOpenFile() fails with error "Access Denied". What will be the reason? How I can access the file having all permissions denied to all users in native mode?

Can anybody tell who is the user in native mode? Is it System?

Re: Problem with NtopenFile Api in native application

Iain Clarke, Warrior Programmer30-Jan-09 0:13

Iain Clarke, Warrior Programmer

30-Jan-09 0:13

I'm a little confused by the question - the user will be the same one as started the program running, whichever mode you're in.

If your native code is running under your used credentials, it will have your access rights. And as you've set it to "all permissions denied to all users", then not many people can look...

I may have misunderstood, because it looms like you already answered your own question.

Services run under a different user, and drivers run in a different security context again, but that's not what you describe (or what I read!)

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Re: Problem with NtopenFile Api in native application

Stuart Dootson30-Jan-09 3:46

Stuart Dootson

30-Jan-09 3:46

He means this sort of native mode[^] - i.e. applications that run before windows starts.

Re: Problem with NtopenFile Api in native application

Iain Clarke, Warrior Programmer30-Jan-09 8:54

Iain Clarke, Warrior Programmer

30-Jan-09 8:54

D'oh - I knew that...

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

ACE framework

hrishiS29-Jan-09 19:28

hrishiS

29-Jan-09 19:28

Hi everyone,
I am trying to implement message Queue using ACE framework. Trying to learn that concept from "C++ Network Programming, Volume 2: Systematic Reuse with ACE and Frameworks" book. But not getting head and tail of it.
Could anyone Please give me the important functions/class that will be enough to implement msg queue.

Thank you in advance

I am a learner Always

Re: ACE framework

Cosmic Egg30-Jan-09 10:01

Cosmic Egg

30-Jan-09 10:01

See example
http://www.huihoo.org/ace_tao/ACE-5.2+TAO-1.2/ACE_wrappers/docs/tutorials/Chap_7/ex01.html[^]

Problem with DeviceIoControl()

john563229-Jan-09 19:13

john5632

29-Jan-09 19:13

Hi All,

I am using DeviceIoControl() with control code FSCTL_GET_VOLUME_BITMAP to get the Bitmap of file system.

But the funtion is returning FALSE and GetLastError() is 1 (Incorrect function).

What might be the problem?

code is here:

STARTING_LCN_INPUT_BUFFER StartingLCN;
		VOLUME_BITMAP_BUFFER *Bitmap = NULL;
		ULONGLONG BitmapSize;
		DWORD BytesReturned;
		BOOL Result;

		StartingLCN.StartingLcn.QuadPart = 0;
		// Allocate buffer
		// Call FSCTL_GET_VOLUME_BITMAP once with a very small buffer
		// This will leave the total number of clusters in Bitmap->BitmapSize and we can
		// then correctly allocate based off that
		// I suppose this won't work if your drive has only 40 clusters on it or so :)
		BitmapSize = sizeof (VOLUME_BITMAP_BUFFER)*512;// + 4;
		Bitmap = (VOLUME_BITMAP_BUFFER *) malloc (BitmapSize);

		Result = DeviceIoControl
			(
			hHandle,
			FSCTL_GET_VOLUME_BITMAP,
			&StartingLCN,
			sizeof (StartingLCN),
			Bitmap,
			BitmapSize,
			&BytesReturned,
			NULL
			);

		int nError=GetLastError();
		// Bad result?
		if (Result == FALSE  &&  GetLastError () != ERROR_MORE_DATA)
		{
			//wprintf ("\nDeviceIoControl returned false, GetLastError() was not ERROR_MORE_DATA\n");
			free (Bitmap);
			return FALSE;
		}

How to implement Tab order to the controls in a MFC Dialog box

kapardhi29-Jan-09 18:55

kapardhi

29-Jan-09 18:55

Hai!

In my application there is a dialog containing various controls like 3 buttons, 2 Radio buttons etc.
How can i specify a Tab order for them i.e when i first press Tab on keyboard the 1st button in my dialog must be highlighted, when i again press "Tab" on keyboard 2nd button must be highlighted, How to implement this and how to specify the order?

Thanks!

Re: How to implement Tab order to the controls in a MFC Dialog box

Naveen29-Jan-09 18:59

Naveen

29-Jan-09 18:59

open your dialog in the IDE, Press "Ctrl + D". This will display the current tab order. Click on each controls in the order in which you want to set tab-order.

nave

[OpenedFileFinder] [My Blog]

Re: How to implement Tab order to the controls in a MFC Dialog box

Nahida HK12-Jul-16 22:29

Nahida HK

12-Jul-16 22:29

I did That But the tab order doesn't work on checkbox and RadioButton and i don't know why !!

Re: How to implement Tab order to the controls in a MFC Dialog box

ATM@CodeProject29-Jan-09 19:01

ATM@CodeProject

29-Jan-09 19:01

Hi,
LayoutMenu->TabOrder

Re: How to implement Tab order to the controls in a MFC Dialog box

Nishad S29-Jan-09 19:05

Nishad S

29-Jan-09 19:05

If you are using resource editor, you can set the tab order there. It is available in "Layout" menu in VC6 and "Format" menu VC9. Shortcut key is Ctrl + D (in VC6 keyboard shortcut map). Then you can see the tab order indication for all controls. You can click on each controls to sequence.

If you are creating the controls dynamically, the creation order sets the tab order. You can change it by using SetWindowPos().

- ns ami -

Re: How to implement Tab order to the controls in a MFC Dialog box

AJ8326-Apr-11 22:02

AJ83

26-Apr-11 22:02

Hi ns Ami,

I am creating dynamic edit box in Group Box. My current Tab order is Group Box, OK, Cancel button. Now I want tab order as:
Group box-> Edit Box 1 -> Edit Box 2 -> Edit Box 3 -> OK -> Cancel.

How can i achieve this? do you have any idea?

Regards,
Anshul

Re: How to implement Tab order to the controls in a MFC Dialog box

Nishad S26-Apr-11 22:24

Nishad S

26-Apr-11 22:24

I presume that "dynamic edit box" means you are creating edit box dynamically at run time. If so, you can use SetWindowPos API to set the Z-order of edit control. You will get more information from the API documentation. The parameter hWndInsertAfter (or pWndInsertAfter in the case of MFC) can be the window handle of control, which is needed to be before in tab order.
For example,
m_edit2.SetWindowPos( &m_edit1, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZER | SWP_NOACTIVATE );
This will set the tab order as edit1 -> edit2.

Hope this info will help.

- ns ami -

Re: How to implement Tab order to the controls in a MFC Dialog box

AJ8326-Apr-11 23:07

AJ83

26-Apr-11 23:07

Hi Ami,

I am creating edit box in Group box as:

#define ID_CURRENT_SN_EDIT  2000

m_gbGroupBox = (CStatic*)GetDlgItem(IDC_GROUPBOX);
int pointY = 0;
int i = 0;

for (int x = 0; x < m_vecpData->size(); x++, i++)
{
  pointY = 30 + (i * 35);
  m_ceEdit = new CEdit;
  m_ceEdit->Create(WS_VISIBLE| WS_BORDER |ES_READONLY | WS_TABSTOP, CRect(10, pointY, 130, pointY + 25), m_gbGroupBox, ID_CURRENT_SN_EDIT + i);
  m_ceEdit->SetWindowText(m_vecpData->at(x).c_str());
  m_ceEdit->SetWindowPos(m_gbGroupBox, HWND_BOTTOM , 10, pointY, 130, pointY + 25, SWP_NOSIZE); // This line is not working.:confused:
  m_ceEdit->ShowWindow(SW_SHOWNORMAL);
}

Re: How to implement Tab order to the controls in a MFC Dialog box

Nishad S26-Apr-11 23:24

Nishad S

26-Apr-11 23:24

In this case the tab order will be same as the creation order. So no need to set the Z-order again. Anyway, is this a compilable code? Argument count of SetWindowPos seems as wrong.

Note that you are creating edit control as child of that GroupBox (a static control, i think). In that case the tab key navigation will not enter to the controls inside the GroupBox. Applying WS_EX_CONTROLPARENT style to GroupBox will help you.

For instance,
m_gbGroupBox->ModifyStyleEx( 0, WS_EX_CONTROLPARENT );

- ns ami -

Re: How to implement Tab order to the controls in a MFC Dialog box

AJ8326-Apr-11 23:38

AJ83

26-Apr-11 23:38

This is my modified compilable code but tab order is not working as GRPBox -> Edit 1 -> Edit 2 -> Edit 3 -> OK -> CANCEL.

It is still working as GRPBox -> OK -> CANCEL.

#define ID_CURRENT_SN_EDIT  1003

m_gbGroupBox = (CStatic*)GetDlgItem(IDC_GROUPBOX);
m_gbGroupBox->ModifyStyleEx( 0, WS_EX_CONTROLPARENT);

m_btnOK      = (CButton*)GetDlgItem(IDC_OK);
m_btnCancel  = (CButton*)GetDlgItem(IDC_CANCEL);

int pointY = 0;
int i = 0;

for (int x = 0; x < m_vecpData->size(); x++, i++)
{
  pointY = 30 + (i * 35);
  m_ceEdit = new CEdit;
  m_ceEdit->Create(WS_VISIBLE| WS_BORDER |ES_READONLY, CRect(10, pointY, 130, pointY + 25), m_gbGroupBox, ID_CURRENT_SN_EDIT + i);
  m_ceEdit>SetWindowText(m_vecpData->at(x).c_str());
  int nCtlrID = ID_CURRENT_SN_EDIT + i;

  if (x > 0)
  {
    CEdit* pEdit = (CEdit*)GetDlgItem(nCtlrID - 1);
    m_ceEdit->SetWindowPos(pEdit, 10, pointY, 130, pointY + 25, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE );
  }
  m_ceEdit->ShowWindow(SW_SHOWNORMAL);
}

Any Help or Suggestion!! I do not know what to do now.

Re: How to implement Tab order to the controls in a MFC Dialog box

Nishad S26-Apr-11 23:46

Nishad S

26-Apr-11 23:46

Well, you missed WS_TABSTOP style.

AJ83 wrote:
m_ceEdit->Create(WS_VISIBLE| WS_BORDER |ES_READONLY, CRect(10, pointY, 130, pointY + 25), m_gbGroupBox, ID_CURRENT_SN_EDIT + i);

And the following is not needed...

AJ83 wrote:
if (x > 0)
{
CEdit* pEdit = (CEdit*)GetDlgItem(nCtlrID - 1);
m_ceEdit->SetWindowPos(pEdit, 10, pointY, 130, pointY + 25, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE );
}
m_ceEdit->ShowWindow(SW_SHOWNORMAL);

- ns ami -

Re: How to implement Tab order to the controls in a MFC Dialog box

AJ8327-Apr-11 0:05

AJ83

27-Apr-11 0:05

Hey Ami,

Thanks a lot for your valuable suggestion. It is working now. great :) !!!

Now my another task is:

There is one Static GRPbox which has been created in CFormView by using ToolBox. Now in Static Groupbox, I am creating "n" number of dynamic GrpBox. In Dynamic GrpBox, I am creating dynamic Edit Box (few are READ ONLY too).

Now I have to set taborder for that also. Any suggestion on this.?

Regards,
Anshul

Re: How to implement Tab order to the controls in a MFC Dialog box

Nishad S27-Apr-11 0:18

Nishad S

27-Apr-11 0:18

I believe that, since you could understand your first solution well, you can implement this easily. Smile | :)

Or, are you in any trouble with that?

- ns ami -

Re: How to implement Tab order to the controls in a MFC Dialog box

AJ8327-Apr-11 0:22

AJ83

27-Apr-11 0:22

Well, In first round it is working but once it comes to OK or CANCEL button is not going back to edit box.

I am trying for that...

I will post code after few minutes or if you do have idea of why is it not coming back to edit box, you can let me know..

Regards,
Anshul

Re: How to implement Tab order to the controls in a MFC Dialog box

AJ8327-Apr-11 1:52

AJ83

27-Apr-11 1:52

Hi Ami,

My problem has been resolved. your given suggestion worked out.

Thanks a lot once again..... :)

str length

VC++Maniac29-Jan-09 18:24

VC++Maniac

29-Jan-09 18:24

how to get the full length of the string that contains 0's inbetween.
I tried _tcslen() on the LPCTSTR, but it gives the string len till the first occurrence of a 0.

TIA

Re: str length

Naveen29-Jan-09 18:44

Naveen

29-Jan-09 18:44

But in that case, how will you find the end of the string?

nave

[OpenedFileFinder] [My Blog]

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