Problem with thread - C / C++ / MFC Discussion Boards

NewHSKid3-Sep-03 4:45

3-Sep-03 4:45

I would like to know if there is a way to disable the enter key from being used in my app. It seems that every time the enter key is pressed, it closes a dialog in my app.

Thank you.

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Diable enter key

Ravi Bhavnani3-Sep-03 5:35

Ravi Bhavnani

3-Sep-03 5:35

There are basically 2 ways to handle this.

Write a handler for OnOK() that doesn't do anything (i.e. just returns) and create another "OK" button (eg. with id IDC_REAL_OK_BUTTON) and write a handler for that, which simply calls CDialog::OnOK().
Override PreTranslateMessage() and filter out the appropriate message - I think it's WM_CHAR but I could be wrong. This will force your user to click the OK button to end the dialog.

/ravi

Let's put "civil" back in "civilization"
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Re: Diable enter key

NewHSKid3-Sep-03 5:58

NewHSKid

3-Sep-03 5:58

Thanks Ravi,

I am still new to Programming, and what you said makes sense but is still foreign to me.
Can you tell me where I would find the PreTranslateMessage() function?

Perhaps you would be kind enough to point me to some example code or some steps to which i can get this accomplished.

Thanks you.

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Diable enter key

Ravi Bhavnani3-Sep-03 6:01

Ravi Bhavnani

3-Sep-03 6:01

Search for the text "PreTranslateMessage" on this page: http://www.widgetware.com/faqsub.htm[^] and use the VK_ENTER code.

/ravi

Let's put "civil" back in "civilization"
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Re: Diable enter key

valikac3-Sep-03 6:00

valikac

3-Sep-03 6:00

Furthermore, override OnClose().

Kuphryn

How to capture ENTER key in single line edit box?

melwyn3-Sep-03 4:40

melwyn

3-Sep-03 4:40

Hi,
I have a single line edit box on a dialog. When the user finishes typing in the edit box and presses the Enter key I would like to receive notification so that I can do the required processing.
How do I get notified when the user presses the Enter key? Is my only option the PreTranslateMessage?

Thanks.

Re: How to capture ENTER key in single line edit box?

Ravi Bhavnani3-Sep-03 5:37

Ravi Bhavnani

3-Sep-03 5:37

See my reply to the next (i.e. more recent) message in this forum.

/ravi

Let's put "civil" back in "civilization"
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Problem with thread

Majid Shahabfar3-Sep-03 4:14

Majid Shahabfar

3-Sep-03 4:14

Hi dear,
I created a thread.
But when I start the thread CPU load become 100%.
I use these code.

void CEventLine::BeginThread()<br />
{<br />
m_isRunning = TRUE;<br />
AfxBeginThread(ThreadStart,this,THREAD_PRIORITY_LOWEST);<br />
}<br />
<br />
UINT CEventLine::ThreadStart(LPVOID pParam)<br />
{<br />
CEventLine* pEventLine = (CEventLine*)pParam;<br />
if (pEventLine == NULL || !pEventLine->IsKindOf(RUNTIME_CLASS(CEventLine)))<br />
return 1; // if pEventLine is not valid<br />
<br />
while(m_isRunning == 1)<br />
pEventLine->Start();<br />
<br />
return 0; // thread completed successfully<br />
}<br />
<br />
void CEventLine::Start()<br />
{<br />
// some code<br />
}<br />

CEventLine is a CDialog based class.
Thank you in advance.

Re: Problem with thread

Iain Clarke, Warrior Programmer3-Sep-03 5:52

Iain Clarke, Warrior Programmer

3-Sep-03 5:52

It's no great shock that the CPU load is 100%.
After all...

  while (m_isRunning == 1)
    pEventLine->Start ();
  ...
}

void CEventLine::Start ()
{
}

simply calls Start again and again and again... with no pause for "breath". It would be the same
if you put this code in your main thread. You have a few choices...

a) Put up with it. Assuming this is only for a brief duration.
b) Put up with it, but make it less of a nuisance. I've not used MFCs threads, and MFC is poor at sharing,
but you can lower thread priority to make other threads more responsice.

DWORD dwID;
hScanThread = ::CreateThread (NULL, 0, DoScan, this, CREATE_SUSPENDED, &dwID);
if (hScanThread == NULL)
{
  DWORD   dwError = ::GetLastError ();
} else
::SetThreadPriority (hScanThread, THREAD_PRIORITY_HIGHEST);

c) Put a delay (sleep) between each iteration of the loop. This would have to be short.
d) Some other tactic depending on the contents of CEventLine::Start ().

Iain.

Re: Problem with thread

Brad Sokol3-Sep-03 5:56

Brad Sokol

3-Sep-03 5:56

Choice e) might be let the thread naturally relinquish the CPU by blocking on an I/O or message queue, for example. Depending on how often/long it blocks, this may be enough.

Brad

Re: Problem with thread

Iain Clarke, Warrior Programmer3-Sep-03 6:02

Iain Clarke, Warrior Programmer

3-Sep-03 6:02

True, but then it may not respond to the "quit" flag.

Then again, waiting on multiple objects (the first of which is a KILL, DIE, DIE! event)
is the way I usually go. But with less dramatic variable names.

Iain

Re: Problem with thread

Scott H. Settlemier3-Sep-03 10:18

Scott H. Settlemier

3-Sep-03 10:18

Sleep(0) is perfect here.
You can be nice to the system by simply using your time slice to make *one* check of the flag
and then turning over control to another thread.

Although typically I would argue against using a flag and using an appropriate synchronization
object instead.

WinCVS and Visual Studio 6

Jerome Conus3-Sep-03 3:57

Jerome Conus

3-Sep-03 3:57

Hi !

We just started to use WinCVS with Visual Studio 6 for our new project, but we don't have any experience with it. We made it work, but I would like to know if someone uses WinCVS as well.

What I'd like to know is what to do with the .obj files. When I update my project from the server, the .cpp and .h files are usually updated correctly, but the .obj, as binaries, are usually a mess, and I just have to rebuild all, which takes time.

How do you guys work ? Do you put your obj files into CVS ?

Thanks for sharing your experience !
Jerome

Re: WinCVS and Visual Studio 6

Stefan Pedersen3-Sep-03 5:23

Stefan Pedersen

3-Sep-03 5:23

Why on earth would you put obj files in CVS?
Just put the stuff that isn't re-created automagically there.
(To add binaries you need to mark them as just that or else CVS will corrupt them).

Re: WinCVS and Visual Studio 6

Jerome Conus3-Sep-03 19:07

Jerome Conus

3-Sep-03 19:07

Stefan Pedersen wrote:
Why on earth would you put obj files in CVS?

Well, when we first decided to use CVS, we didn't want to put obj files in it, but if we don't, each time I update my local project, I have to rebuild all, which takes a long time. How did you managed to solve this problem ?

Thanks for your answer !
Jerome

Re: WinCVS and Visual Studio 6

Stefan Pedersen3-Sep-03 22:58

Stefan Pedersen

3-Sep-03 22:58

You shouldn't need to rebuild all.
Only the files needed should be rebuilt (you seldom update the whole project).
I would check the clock on all the computers used for devel and CVS.
Something seems a bit fishy...

Re: WinCVS and Visual Studio 6

Rasqual Twilight4-Sep-03 2:15

Rasqual Twilight

4-Sep-03 2:15

Maybe this page can help you?
Info: (cvs) Binary howto

It talks about using the -kb option when adding a file to the repository.

Escape URLs?

Dominik Reichl3-Sep-03 3:42

Dominik Reichl

3-Sep-03 3:42

Hello,

I know there is function that escapes an URL (for example transforms "bla bla" to "bla%20bla")...

What was its name?

Confused | :confused:

Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Escape URLs?

Iain Clarke, Warrior Programmer3-Sep-03 5:42

Iain Clarke, Warrior Programmer

3-Sep-03 5:42

UrlCanonicalize

Takes a URL string and converts it into canonical form.

And there was me thinking it mean promoting to sub-bishop...

Iain.

Re: Escape URLs?

Dominik Reichl3-Sep-03 6:21

Dominik Reichl

3-Sep-03 6:21

Hmm, I couldn't find that function... it's in the shlwapi.lib file, but I don't have any header file that contains the function declaration...

Perhaps I need latest platform sdk...

Thanks for your reply!
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Escape URLs?

David Crow3-Sep-03 11:02

David Crow

3-Sep-03 11:02

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/shlwapi/path/UrlCanonicalize.asp

Re: Escape URLs?

Ravi Bhavnani3-Sep-03 5:44

Ravi Bhavnani

3-Sep-03 5:44

Would you believe... UrlEscape(). Smile | :)

/ravi

Let's put "civil" back in "civilization"
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Escape URLs?

Dominik Reichl3-Sep-03 6:20

Dominik Reichl

3-Sep-03 6:20

Hmm, I couldn't find that function... it's in the shlwapi.lib file, but I don't have any header file that contains the function declaration...

Perhaps I need latest platform sdk... Dead | X|

Thanks for your reply!
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Escape URLs?

David Crow3-Sep-03 11:02

David Crow

3-Sep-03 11:02

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/shlwapi/path/urlescape.asp

Disable Menu Items

Jay Hova3-Sep-03 3:05

Jay Hova

3-Sep-03 3:05

Hi,

I was wondering if someone could help me disable a menu option.

Thank you for your help.

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