Trouble getting device context - C / C++ / MFC Discussion Boards

Re: Dameged files

Christian Graus31-Jul-05 20:05

Christian Graus

31-Jul-05 20:05

Ask the author.

Christian Graus - Microsoft MVP - C++

How to access the I/O port under Windows2000

pantao55131-Jul-05 15:23

pantao551

31-Jul-05 15:23

I know that in Windows95, we use the function _outp and _inp to access the I/O port. But they can't be used in Windows2000. What can I do? Should I have to use some software to develop a driver? Confused | :confused:

Re: How to access the I/O port under Windows2000

Abbas_Riazi31-Jul-05 20:05

Abbas_Riazi

31-Jul-05 20:05

You must develop a kernel mode driver or may be using the already exist driver such as WinIO.

Best regards,
A. Riazi

Re: How to access the I/O port under Windows2000

Marc Soleda31-Jul-05 20:53

Marc Soleda

31-Jul-05 20:53

You can use CreateFile & WriteFile [^]
to access to serial port.

Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

Status bar problem

TEOlivier31-Jul-05 10:57

TEOlivier

31-Jul-05 10:57

When I create a MFC application using the wizard and choose it to be maximized and with no maximize button the status bar seem to be misplaced (below the windows task bar?). When I hide my windows task bar and un-hide it again then the status bar is correctly placed. Help appreciated. Thanx

Images in Rich edit

Aqueel31-Jul-05 8:06

Aqueel

31-Jul-05 8:06

Can a rich edit control show images and background colors used in .rtf file.

We Believe in Excellence

Re: Images in Rich edit

Trollslayer31-Jul-05 8:57

Trollslayer

31-Jul-05 8:57

This[^] one can !
A messaging application perhaps ?

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Trouble getting device context

theFrenchHornet31-Jul-05 7:41

theFrenchHornet

31-Jul-05 7:41

I don't know how to correctly acquire the device context for a control. If I put similar code in the OnCtlColor routine where a pointer to the device context is provided, the code works. However, when I try setting the device context, the code doesn't work. Two samples are provided - the first is the code that doesn't work. I appreciate any help fixing it. Thank-you.

This code compiles and runs without error, but does not achieve the color change. (c_navValid is a text box control)

LOGFONT lf;
CDC* dc = new CDC;
dc->Attach(c_navValid.GetDC()->m_hDC);
         
GetFont()->GetObject(sizeof(lf), &lf);
font.CreateFontIndirect(&lf);

dc->SelectObject(&font);
dc->SetTextColor(RGB(0,100,0));
font.DeleteObject();

This code works.

HBRUSH CNavDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
 W_Position_Data_Type* pPositionMsg;
 pPositionMsg = (W_Position_Data_Type*)&CInMsgs::wPositionMsg;
	
 HBRUSH hbr = CPropertyPage::OnCtlColor(pDC, pWnd, nCtlColor);

 if (pWnd->GetDlgCtrlID() == IDC_NAV_VALID)
 {
   if (pPositionMsg->Mode_Word.Nav_Valid)
   {
     LOGFONT lf;
     GetFont()->GetObject(sizeof(lf), &lf);
     font.CreateFontIndirect(&lf);
     pDC->SelectObject(&font);
     pDC->SetTextColor(RGB(0,100,0));
     font.DeleteObject();
   }
 }

Re: Trouble getting device context

Michael Dunn31-Jul-05 19:56

Michael Dunn

31-Jul-05 19:56

Use CClientDC or CWindowDC to get a DC for a window. Use the former to draw in the window's client area only, or the latter if you need to draw in the non-client area too.

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

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Wizard needs food, badly!

Re: Trouble getting device context

theFrenchHornet1-Aug-05 5:23

theFrenchHornet

1-Aug-05 5:23

Could you please show me the code? To use CClientDC I need a pointer to a window. How do I convert the static control to a window pointer? cCliendDc dc(c_navValid); I know isn't correct. What parameter do I pass to CClientDC to get a dc for the control? Thanks.

Embedding Text into PDF

Abbas_Riazi31-Jul-05 1:16

Abbas_Riazi

31-Jul-05 1:16

Does anyone know how can I embedd some text into an existant PDF that can indexed by search engines?
I want to hide the embedded text but search engines can index it.

Best regards,
A. Riazi

Finding the modem

Y_R30-Jul-05 23:19

Y_R

30-Jul-05 23:19

Hello,

Can anyone know how can I query windows for its devices.

What I mean is that my program needs to know which modems are installed on the pc and thier ports, etc..

The windows device manager is a good example, I want to know how to get data the device manager displays.

Thanks

Y.R.

Re: Finding the modem

Abbas_Riazi31-Jul-05 1:18

Abbas_Riazi

31-Jul-05 1:18

See my articles:

- Enumerate Installed Devices Using Setup API[^]

- Enumerate Properties of an installed Device[^]

Best regards,
A. Riazi

Re: Finding the modem

Y_R31-Jul-05 10:32

Y_R

31-Jul-05 10:32

Thank you very much.

After posting this message I searched in code project and indeed got to your article "Enumerate Installed Devices Using Setup API[^]". I loved it very much very intresting.

I will read the second one now.

Regards
Y.R.

Re: Finding the modem

Abbas_Riazi31-Jul-05 20:02

Abbas_Riazi

31-Jul-05 20:02

A. Riazi

Edit Control

khlins30-Jul-05 22:13

khlins

30-Jul-05 22:13

hi guys,

I need a help.
How to set height of Edit Control?
Please let me know if you have any advices or solutions.
Thank you very much!

Best Regard,
KHLin.

Re: Edit Control

vishalmore30-Jul-05 22:58

vishalmore

30-Jul-05 22:58

You can set the height/width of the edit control using any of the following
mehtods.

BOOL MoveWindow(HWND hWnd,
int X,
int Y,
int nWidth,
int nHeight,
BOOL bRepaint
);

HWND CreateWindow(LPCTSTR lpClassName,
LPCTSTR lpWindowName,
DWORD dwStyle,
int x,
int y,
int nWidth,
int nHeight,
HWND hWndParent,
HMENU hMenu,
HINSTANCE hInstance,
LPVOID lpParam
);

Cheers,
Vishal

shellexecute get handle ?

vantran0430-Jul-05 16:16

vantran04

30-Jul-05 16:16

I use function shellexecute (0, "open", "filename", "", "path", SW_SHOW) to execute a program and it runs ok. But I want to get the HWND (handle) of this executed file so that i can hide, minimze, or close it. Please help me how to code (in win32 api) to get the HWND. Thanks.

Re: shellexecute get handle ?

vishalmore30-Jul-05 23:58

vishalmore

30-Jul-05 23:58

Hi,

You can get HWND for the application you are opening through "ShellExecute"
using following technique

Psedo code:

ShellExecute(GetDesktopWindow(), "open", "filename", "", "path", SW_SHOW)
EnumChildWindows(GetDesktopWindow(), CallBackChildWindows, lParam)
CallBackChildWindows(...)
{
int iRet;
//Get the class name of the window
iRet = GetClassName(hwnd,strClassName,..)
if(iRet!=0)
{
//You must be knowing the class name for the application, which you are
//opening through the SheeExecute. So match the class name here, once
//match the class name exit from this proc.
//arrStrClassNames would have all the class names
if(strClassName==arrStrClassNames[iIndex])
return false
else
return true
}
}

Still facing problems ? Cool | :cool:

Cheers,
Vishal

Re: shellexecute get handle ?

ThatsAlok31-Jul-05 2:44

ThatsAlok

31-Jul-05 2:44

What about Creating Process using CreateProcess Api,Which give Ultimate Control of Process creating Application to control the new born process.

have a look at this article:-
http://www.codeproject.com/system/newbiespawn.asp[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: shellexecute get handle ?

Blake Miller1-Aug-05 7:54

Blake Miller

1-Aug-05 7:54

Also look at ShellExecuteEx instead of ShellExecute

Linked list, passing a pointer

bitsNbites30-Jul-05 15:49

bitsNbites

30-Jul-05 15:49

I have this C++ course and I have creatd a linked list with methods to insert and remove. The program works fine for me but for my instructor it crashes, for him, most likely since he uses his version of main. I can't trobleshoot my version, that easy, since it works. What I suspect is that my remove method wants an actual parameter of a pointer that points to a real address,(not null) and perhaps my instructors main is only sending a pointer. Is it possible to send a pointer, (of a user defined data type UDT) to a method and have that method set what this calling parameter will point to? I hope this makes sense. I have been spending many hours trying to learn all the ins and outs of pointers.
Thanks

If only I had more time!

Re: Linked list, passing a pointer

John M. Drescher30-Jul-05 18:04

John M. Drescher

30-Jul-05 18:04

Have you tried passing bad values to your methods. Like trying to remove the same element more than one time? If you remove all emements in your main does it crash?

bitsNbites wrote:
I hope this makes sense.
Not fully.

John

Re: Linked list, passing a pointer

S. Senthil Kumar31-Jul-05 4:20

S. Senthil Kumar

31-Jul-05 4:20

Did you compile and run under Debug mode? And your instructor built and run in Release mode?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

How to manipulate ActiveDesktop buttons

programvinod30-Jul-05 14:04

programvinod

30-Jul-05 14:04

Hi,

I am trying with a program that will create an ActiveDesktop. I want to manipulate the buttons on ActiveDesktop which is intented to manipulate the state of the ActiveDesktop as IS_NORMAL, IS_FULLSCREEN, IS_SPLIT. Is there any option for doing it programically?
I am using IActiveDesktop to manipulate the ActiveDesktop.

Waiting your responses
Vinod

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