Re: WaitForMultipleObjects - C / C++ / MFC Discussion Boards

Re: memcpy related

PJ Arends8-Mar-07 5:00

PJ Arends

8-Mar-07 5:00

I always thought it was that way too Confused | :confused:

Either I was always wrong or the C standard has been changed since I first learned this.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

Re: memcpy related

toxcct8-Mar-07 5:45

toxcct

8-Mar-07 5:45

the game seems to be over for us... let's go back to school ! lol

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Re: memcpy related

prasad_som8-Mar-07 1:34

prasad_som

8-Mar-07 1:34

Maximum size_t can hold.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: memcpy related

NiceNaidu8-Mar-07 2:21

NiceNaidu

8-Mar-07 2:21

Thanks everyone..

Appu..
"My blood group is not B+.But I have it my blood"

WaitForMultipleObjects

Shaileshhex8-Mar-07 0:35

Shaileshhex

8-Mar-07 0:35

I have a call to WaitForMultipleObjects() which waits for any of 4 events to happen ...but the statements after the call to WaitForMultipleObjects() are not executed.

i am not able to debug and get wat value is returned by the call WaitForMultipleObjects()

thanks in advance

Re: WaitForMultipleObjects

Roger Stoltz8-Mar-07 2:03

Roger Stoltz

8-Mar-07 2:03

What does your code look like?
Post the call to WaitForMultipleObjects() and its surroundings and please use <pre> / </pre> tags when posting code.

Are you absolutely sure that WaitForMultipleObjects() is called? Place a breakpoint on it to verify this.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: WaitForMultipleObjects

Mark Salsbery8-Mar-07 6:34

Mark Salsbery

8-Mar-07 6:34

Shaileshhex wrote:
but the statements after the call to WaitForMultipleObjects() are not executed.

Even if you use a timeout value? If you never get past a wait function then none of the objects
were signalled.

Mark

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

Re: WaitForMultipleObjects

Shaileshhex8-Mar-07 19:51

Shaileshhex

8-Mar-07 19:51

hi...
Thanks for ur replies...
i think ur right may b the event is not signalled.... code is as below
aslso its not my code and, event created is ITC_APP_EVENT_RIGHTSCAN...i have no idea where ITC_APP_EVENT_RIGHTSCAN comes from.....

hCenterDelta=CreateEvent(NULL, FALSE, FALSE, _T("ITC_APP_EVENT_CENTERSCAN"));
hCenterState=CreateEvent(NULL, TRUE, FALSE, _T("ITC_APP_STATE_CENTERSCAN"));

hRightDelta=CreateEvent(NULL, FALSE, FALSE,_T("ITC_APP_EVENT_RIGHTSCAN"));
hRightState=CreateEvent(NULL, TRUE, FALSE, _T("ITC_APP_STATE_RIGHTSCAN"));

hLeftDelta=CreateEvent(NULL, FALSE, FALSE, _T("ITC_APP_EVENT_LEFTSCAN"));
hLeftState=CreateEvent(NULL, TRUE, FALSE, _T("ITC_APP_STATE_LEFTSCAN"));

hIRDAReset=CreateEvent(NULL, TRUE, FALSE, _T("NOTIFICATION_EVENT_WAKEUP"));

h = CreateEvent( NULL, TRUE, FALSE, EVENTNAME_KEYBOARD_CHANGE );

if ( h != INVALID_HANDLE_VALUE ) {
SetEvent( h );
CloseHandle( h );
} // end if
//the closed event
hClosed = CreateEvent(NULL,TRUE,FALSE,_T("RfidCloseEvent"));
HANDLE hObjectList[] =
{
hClosed,
hCenterDelta,
hRightDelta,
hLeftDelta,
hIRDAReset
};

while (1)
{
DWORD wc = WaitForMultipleObjects(
sizeof(hObjectList)/sizeof(HANDLE), // number of handles in array
hObjectList, // object-handle array
FALSE, // wait option
(DWORD) INFINITE // time-out interval
);
//THE breakpoint holds at this point...
switch ( wc)
{
WAIT_OBJECT_0 + 2: //Center button
if (WaitForSingleObject(hRightState,0)==WAIT_OBJECT_0)
{
//some code
}
etc..etc..
}

}

LET ME KNOW UR THOUGHTS

bye

Re: WaitForMultipleObjects

Mark Salsbery8-Mar-07 20:06

Mark Salsbery

8-Mar-07 20:06

The only thing I see in your code sample is

WAIT_OBJECT_0 + 2: //Center button

WAIT_OBJECT_0 + 2 corresponds to the hRightDelta event handle, not the hCenterDelta event handle.
Remember the array is indexed from 0 Smile | :)

If you put a breakpoint on the switch ( wc) line and execution never pauses there then none of the
five events eing waited on are getting signalled.

Mark

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

Re: WaitForMultipleObjects

Shaileshhex9-Mar-07 0:57

Shaileshhex

9-Mar-07 0:57

hi Mark...
I found that the events ITC_APP_EVENT_RIGHTSCAN etc ..were not present in the devices registry...so i added these events ..but still that event does not get signalled ....

my device uses WIN CE 3.0...but the event gets signalled for another device which has WINCE 4.2

does this mean that 3.0 does not recognise ITC_APP_EVENT_RIGHTSCAN??...if so then how do i find which is the correct event

thanks

Re: WaitForMultipleObjects

Mark Salsbery9-Mar-07 6:18

Mark Salsbery

9-Mar-07 6:18

Hmm I have no idea how event objects relate to the registry.

You are creating named event objects in your code. That means if an event with the same name
already exists on the system then you'll get a handle to that same event. If the event does not
already exist in the system, you get a new event object.

Are you sure these "ITC_APP_EVENT_xxx" strings represent the name of named events in another
process? This has nothing to do with the registry.

Mark

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

distinguish a DVD-RAM from a flash memory card!

reza matinnejad8-Mar-07 0:04

reza matinnejad

8-Mar-07 0:04

How could i distinguish a DVD-RAM from a flash memory card
(both are Removable storage drives)
in runtime?

Re: distinguish a DVD-RAM from a flash memory card!

PS@Codeproj8-Mar-07 2:10

PS@Codeproj

8-Mar-07 2:10

I hope "GetDriveType" API will return
DRIVE_RAMDISK for DVD-RAM Disk and
DRIVE_REMOVABLE for Removeable Drive.

Thanks & Rgds,
Sri..

doubt in textbox controls used in MFC

harshadha7-Mar-07 23:50

harshadha

7-Mar-07 23:50

Hai,

Good Evening....

I was working with the controls of textbox i have a doubt in that can anyone
clear it....

I created a form in MFC by having various controls.
1.In that i have a textbox in which iam entering some values.
2.I want that value to be printed in the message box...
Can anyone please tell me how to do....

Thanks
Harshadha

Re: doubt in textbox controls used in MFC

Hamid_RT7-Mar-07 23:58

Hamid_RT

7-Mar-07 23:58

You have a editbox CEdit m_EDit; and it has values "12345" now you want to show these values use of m_Edit1.GetWindowText();

WhiteSky

Re: doubt in textbox controls used in MFC

harshadha8-Mar-07 0:02

harshadha

8-Mar-07 0:02

hai,

i cant understand ..
Iam passing values to the editbox in run time ,then if i click a command button iam displaying a messagebox,where i want these value to be shown...

Harshadha

Re: doubt in textbox controls used in MFC

Newbie008-Mar-07 0:07

Newbie00

8-Mar-07 0:07

Use the text got by m_Edit1.GetWindowText(); with the MessageBox method...

Re: doubt in textbox controls used in MFC

Hamid_RT8-Mar-07 0:11

Hamid_RT

8-Mar-07 0:11

When click button use of

CEdit m_Edit;
CString str;
m_Edit.GetWindowText(str);
MessageBox(str);

And if you want to set a value dynamicly for editbox use of SetWindowText

WhiteSky

Re: doubt in textbox controls used in MFC

Paresh Chitte8-Mar-07 0:11

Paresh Chitte

8-Mar-07 0:11

Use WM_KILLFOCUS for your text box and get the text using GetWindowText. I hope this is you want.

Re: doubt in textbox controls used in MFC

harshadha8-Mar-07 0:14

harshadha

8-Mar-07 0:14

Hai,,
I cant really understand i brief my question..

Iam entering the values in edit box during runtime and displaying it...

CEdit m_ce;
m_ce.GetWindowText();
TCHAR szMsg[256];
wsprintf(szMsg,_T("hEIGHT: %ld "),m_ce);
MessageBox(szMsg,NULL,MB_OK);

error C2661: 'GetWindowTextA' : no overloaded function takes 0 parameters

Thanks For Spending Your Precious Time

Harshadha

Re: doubt in textbox controls used in MFC [modified]

Paresh Chitte8-Mar-07 0:18

Paresh Chitte

8-Mar-07 0:18

int GetWindowText( LPTSTR lpszStringBuf, int nMaxCount ) const;<br />
void GetWindowText( CString& rString ) const;

Use as below

CEdit m_ce; <br />
CString str;<br />
m_ce.GetWindowText(str);<br />
TCHAR szMsg[256];<br />
long lValue = _ttol((LPCTSTR)str);<br />
wsprintf(szMsg,_T("hEIGHT: %ld "),lValue);<br />
MessageBox(szMsg,NULL,MB_OK);

-- modified at 6:26 Thursday 8th March, 2007

Re: doubt in textbox controls used in MFC

harshadha8-Mar-07 0:47

harshadha

8-Mar-07 0:47

Hai,

Iam sorry for troubling you again but iam getting memory error like asking
whether to retry or abort...
If i click ignore its displaying msgbox with 0 in it..

Thanks

Harshadha

Re: doubt in textbox controls used in MFC

Paresh Chitte8-Mar-07 1:15

Paresh Chitte

8-Mar-07 1:15

have you done validation on the text box like the input is only numeric value and not alphabet nor alphanumeric...

Re: doubt in textbox controls used in MFC

harshadha8-Mar-07 1:19

harshadha

8-Mar-07 1:19

Re: doubt in textbox controls used in MFC

PS@Codeproj8-Mar-07 1:20

PS@Codeproj

8-Mar-07 1:20

Hi,

I think u havent created a member variable for the editbox. Simply you would have written like
CEdit m_ce;
It ll not work out.
First you need to create a member variable for the edit box using class wizard with the control type as Edit.
say, the member variable is m_editChar. then,

CString str;
m_editChar.GetWindowText(str);
MessageBox(str);

now, the str ll give u the value entered by the user in the edit box.

Hope this ll solve your problem.

Thanks & Rgds,
Sri..

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