Re: How do I keep a ListCtrl visible? - C / C++ / MFC Discussion Boards

Choose between C runtime library and Win32 API

NicholasCougar9-Apr-02 19:43

9-Apr-02 19:43

Hi,
It's not easy to choose between functions in C runtime library and Win32 API, for example, CreateThread() and EndTread() are in Win32 API,
_beginthreadex() and _endthreadex() in C runtime library.
Can anybody tell me the difference and reason why I should choose one of then instead of the other.
Thank you in advance.

Best regard.

I confess that I am a stubborn guy, but why not put things thoroughly, logically and systematically clean. One concrete prolem is worth a thousand unapplied abstractions.

Re: Choose between C runtime library and Win32 API

Christian Graus9-Apr-02 22:09

Christian Graus

9-Apr-02 22:09

In this case, I believe you should choose the C runtime, because I seem to recall Richter had bad things to say about CreateThread and EndThread. As a rule, I prefer C++ over C functions, and standard functions over M$ specific ones, but overall for something OS dependant like threading I would go with the M$ ones, except in this case where Jeff Richter says not to.

There, was that confusing enough for you ? Smile | :)

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

Re: Choose between C runtime library and Win32 API

Nish Nishant10-Apr-02 0:59

Nish Nishant

10-Apr-02 0:59

Hi CG,

Richter's advice was that we should use _beginthreadex if we plan on using CRT functions inside our thread. But if we are not, then we might as well use the API calls to start threads

Nish

If I am awake and my eyes are closed, it does not necessarily mean that I am thinking of naked women.

Problem with porting 98 to 2K serial comms

9-Apr-02 18:58

I am testing a program i wrote on a win98 system on a
Win2k O.S. and am having troubles with the serial communications.

When executing the program win2k is crashing in the
'WriteFile' function, which leads me to believe there
is something wrong with the flow control or handshaking.
But why would it all work fine on 98 and not 2K.

Does anyone know of any defaults etc that win2k may be setting
or looking for that 98 does not.

p.s. I have set up my DCB as follows

dcb.DCBlength = sizeof(DCB);
dcb.BaudRate = CBR_9600;
dcb.ByteSize = 8;
dcb.StopBits = ONESTOPBIT;
dcb.fParity = NOPARITY;
dcb.fBinary = TRUE;
dcb.fDtrControl = DTR_CONTROL_DISABLE;
dcb.fRtsControl = RTS_CONTROL_DISABLE;
dcb.fTXContinueOnXoff = FALSE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;

Re: Problem with porting 98 to 2K serial comms

Roger Allen10-Apr-02 0:37

Roger Allen

10-Apr-02 0:37

Can't see anything wrong, but heres an example of some code for a serial port which I have used successfully on 95/98/NT/2K/XP

SECURITY_ATTRIBUTES sa ;
sa.nLength = sizeof(SECURITY_ATTRIBUTES) ;
sa.lpSecurityDescriptor = NULL ;        // use default descriptor
sa.bInheritHandle = true ;              // allow sub-threads to inherit handle

m_hSerialPort = CreateFile((LPCTSTR)m_csCommPortName,
                    GENERIC_READ | GENERIC_WRITE,
                    0,
                    &sa,                            // needed for inherit
                    OPEN_EXISTING,
                    0,
                    0) ;
if (m_hSerialPort != INVALID_HANDLE_VALUE)
    {
    m_bOpen = true ;
    if (!GetCommState(m_hSerialPort, &m_dcb))
        {
        error.LoadString(IDS_CAVRO_DCB) ;
        DisplayText(error) ;
        }
    else
        {
        // make sure we are using the correct settings
        FillMemory(&m_dcb, sizeof(DCB), 0) ;    // init to 0
        m_dcb.DCBlength = sizeof(DCB) ;
        m_dcb.BaudRate = CBR_9600 ;                 // 9600 baud
        m_dcb.ByteSize = 8 ;                        // 8 data bits
        m_dcb.Parity = NOPARITY ;                   // no parity
        m_dcb.fParity = false ;                     // parity checking off
        m_dcb.StopBits = ONESTOPBIT ;               // 1 stop bit
        m_dcb.fDtrControl = DTR_CONTROL_DISABLE ;   // no DTR input flow control
        m_dcb.fOutxCtsFlow = false ;                // don't monitor CTS
        m_dcb.fDsrSensitivity = false ;             // always read bytes received
        m_dcb.fTXContinueOnXoff = true ;            // don't wait for XONN / XOFF
        m_dcb.fOutX = false ;                       // No XON / XOFF control
        m_dcb.fRtsControl = RTS_CONTROL_DISABLE ;   // don't use RTS comms control
        m_dcb.fAbortOnError = false ;               // don't quit on error
        // now apply the correct comm state to the device
        if (!SetCommState(m_hSerialPort, &m_dcb))
            {
            error.LoadString(IDS_CAVRO_STATE) ;
            DisplayText(error) ;
            }
        // set the communication event flags
        if (!SetCommMask(m_hSerialPort, EV_RXCHAR))
            {
            error.LoadString(IDS_CAVRO_MASK) ;
            DisplayText(error) ;
            }
        COMMTIMEOUTS    timeouts ;

        // return immediately on reads
        // return after completion on writes
        timeouts.ReadIntervalTimeout = MAXDWORD ;
        timeouts.ReadTotalTimeoutConstant = 0 ;
        timeouts.ReadTotalTimeoutMultiplier = 0 ;
        timeouts.WriteTotalTimeoutConstant = 0 ;
        timeouts.WriteTotalTimeoutMultiplier = 0 ;

        SetCommTimeouts(m_hSerialPort, &timeouts) ;
        }
    }

It may have something in it you have missed.

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?

How do I keep a ListCtrl visible?

shypht9-Apr-02 17:24

shypht

9-Apr-02 17:24

Ok, I am playing around with the new HTML stuff in VS.NET/MFC7, and ditched the CDHTMLDialog, and using the CDHTMLView which I snagged from an article here.

However, what I would like to have is have a MFC ListControl in the bottom portion of the screen, the obvious answer would simply be to have a splitter window. However, I would like to have it look like its imbeded in the over all GUI and not plopped down on the bottom.

I have it so the list control displays when I click on a link, however any other link I click, it instantly vanishes, and when I click on the button again, it wont re-display.

How would I go about having it remain visible, and avoid flickering problems?

Re: How do I keep a ListCtrl visible?

Shog⁹9-Apr-02 18:17

Shog⁹

9-Apr-02 18:17

Possibly:
m_wndList.SetWindowPos(&CWnd::wndTopMost, 0,0,0,0, SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOSIZE);

Developers that like shiny objects also dig case mods and scratch-and-sniff stickers.

Klaus Probst, The Lounge

Re: How do I keep a ListCtrl visible?

shypht9-Apr-02 18:32

shypht

9-Apr-02 18:32

Unfortuantly, that did not work. Hrmmm

Hrmm, one problem I just noticed

shypht9-Apr-02 18:50

shypht

9-Apr-02 18:50

The function I have which is run when I click an HTML link, is only called the first time I click it, and wont do it any other time...

Change Toolbar Dialog Size

Matt Newman9-Apr-02 16:46

Matt Newman

9-Apr-02 16:46

How can I change the size of a dialog toolbar before it is created.
Example:

I want to change IDD_DIALOG's size programatically before it is used to create a toolbar.

I hope that makes sense, Thanks if you can help.

- Suspicious | :suss:

Matt Newman / Windows XP Activist Suspicious | :suss:

-Sonork ID: 100.11179:BestSnowman

†

Re: Change Toolbar Dialog Size

Nish Nishant9-Apr-02 17:10

Nish Nishant

9-Apr-02 17:10

Can;t you just resize the dialog just before you create the toolbar. I presume you do that in WM_INITDIALOG handlwer

Nish

If I am awake and my eyes are closed, it does not necessarily mean that I am thinking of naked women.

Re: Change Toolbar Dialog Size

Matt Newman10-Apr-02 10:54

Matt Newman

10-Apr-02 10:54

There is no class assigned to IDD_DIALOG, I was curious if I could change the resource dimensions on it's resource ID (it is blank)

- Suspicious | :suss:

Matt Newman / Windows XP Activist Suspicious | :suss:

-Sonork ID: 100.11179:BestSnowman

†

How can I record all key strokes of any other processes in background?

Cloudway9-Apr-02 16:10

Cloudway

9-Apr-02 16:10

Any ideas or examples?
Thanks! Frown | :(

Re: How can I record all key strokes of any other processes in background?

Cloudway9-Apr-02 17:13

Cloudway

9-Apr-02 17:13

I have already found one.
Laugh | :laugh:

Re: How can I record all key strokes of any other processes in background?

Alexandru Savescu9-Apr-02 21:53

Alexandru Savescu

9-Apr-02 21:53

Why don't you share it with us? Smile | :)

Best regards,
Alexandru Savescu

Re: How can I record all key strokes of any other processes in background?

Cloudway9-Apr-02 23:21

Cloudway

9-Apr-02 23:21

Hey, I found these just exactly in www.codeproject.com

http://www.codeproject.com/dll/hooks.asp
http://www.codeproject.com/dll/keyboardhook.asp Cool | :cool:

How to register a environment variable ?

Lizp9-Apr-02 15:43

Lizp

9-Apr-02 15:43

For Visual Studio .

Scratch

Re: How to register a environment variable ?

Jeremy Falcon9-Apr-02 16:00

Jeremy Falcon

9-Apr-02 16:00

Programmatically?

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment

Manually?

System Properties/Advanced Tab

Jeremy L. Falcon
"The One Who Said, 'The One Who Said...'"
<nobr>
Homepage : Feature Article : Sonork = 100.16311

Dll prob - HELP

The_Server9-Apr-02 15:23

The_Server

9-Apr-02 15:23

dll_file.H

extern "C"
{
  <code>__declspec</code>(<code>dllexport</code>) <code>bool</code> func1(<code>bool</code> a);
  <code>__declspec</code>(<code>dllexport</code>) <code>bool</code> func2();
}

dll_file.cpp

<code>__declspec</code>(<code>dllexport</code>) <code>bool</code> func1(<code>bool</code> a)
{
  <code>int</code> x=0;
  x=x+1;

  return true;
}

<code>__declspec</code>(<code>dllexport</code>) <code>bool</code> func2()
{
<code>int</code> x=0;
x=x+1;
return <code>true</code>;
}

compiling - OK
LoadLibrary - OK
GetProcAddress(* both func1 & 2 *) - OK
calling func2 - OK
calling func1 - fails while returning back to the app

the error is:
The value of ESP was not properly saved across a function call.

Please
Cry | :((

HH EE LL PP Confused | :confused:

Thank you for reading all this....
Hope u have the answer

Re: Dll prob - HELP

Jeremy Falcon9-Apr-02 16:47

Jeremy Falcon

9-Apr-02 16:47

ESP is the 32-bit stack pointer CPU register that points to locations in the stack segment. Where's the stack being used here? Look at your parameters.

So, we know ESP didn't get a value it expected. Why? I dunno for sure, but you are using C linkage and C doesn't support a bool type. I'm "guessing" the compiler doesn't care because it's being compiled as C++. This may work, I just haven't tried it yet. Also, fun1() is not referencing its param in the first place. Trying using it in the function and change it to an int -- just for testing.

Jeremy L. Falcon
"The One Who Said, 'The One Who Said...'"
<nobr>
Homepage : Feature Article : Sonork = 100.16311

Re: Dll prob - HELP

vmaltsev10-Apr-02 0:26

vmaltsev

10-Apr-02 0:26

The problem is in calling convention.
I guess that you use (CALLBACK *)(bool) or (__stdcall *)(bool) calling convention.
This is wrong in the case then you use "C" declaration of functions (extern "C" {}).
Coz in "C" declaration the caller should clean up stack but not callee.

So you should use (FAR *)(bool) or (__cdecl *)(bool) calling convention in case with "C" declaration.

P.S. Try to avoid using other types in function argument but integer. Coz they will be converted to integer anyway.

Have fun.

closing a view

9-Apr-02 13:55

How do I close a view window problematically?

Do i have to close its frame window and it in some specific order?

Anon

Re: closing a view

Michael Dunn9-Apr-02 14:25

Michael Dunn

9-Apr-02 14:25

Once you have a pointer to the view, just do:
pView->SendMessage ( WM_CLOSE );

--Mike--
Actual sign at the laundromat I go to: "No tinting or dying"
Like the Google toolbar? Then check out UltraBar, with more features & customizable search engines!
My really out-of-date homepage
Big fan of Alyson Hannigan and Jamie Salé.

Re: closing a view

16-Apr-02 21:29

Hi, Mike!
I encountered the same problem recently. You method wont work in a MDI application. Nothing will happen after you send WM_CLOSE.

Try the following step to verify by yourself:
1. Create a MDI application called "Tst" using AppWiz;
2. Craete a CloseView menu item under View menu
add response codes to this menu item in the CTstView class.
void CTstView::OnViewCloseview()
{
// TODO: Add your command handler code here
SendMessage(WM_CLOSE);
}

3. compiled it & run. Open some views, then click on CloseView menu item. You will see, nothing happen.

Is there anybody have a solution for this?

Comments & suggestion are greatly appreciated!

Wayne King
17 April 2002

CDCs and CBitmap

marcela9-Apr-02 13:09

marcela

9-Apr-02 13:09

hello!

I have a question: is it possible to take a CDC and pass it's display to a CBitmap class? For example, I would like to draw things in a window (using Rectangle, Ellipse and such) and then get the pixels in that window to CBitmap.

Once again, my apologies if this is a dumb question, I don't know much about this matters Smile | :)

marcela bovio

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