C / C++ / MFC

PJ Arends18-Jan-04 16:31

PJ Arends

18-Jan-04 16:31

The point is given to you in client coords, and TrackPopupMenu() expects screen coords, so use ClientToScreen() to convert the point.

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Michael Dunn18-Jan-04 16:31

Michael Dunn

18-Jan-04 16:31

You have two problems. First, the point parameter is in window coords, not screen coords. Second, TrackPopupMenu() takes screen coords for the menu location. So you should call ClientToScreen(&point)

--Mike--
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Roger Allen18-Jan-04 23:51

Roger Allen

18-Jan-04 23:51

Or you could just call

::GetCursorPos(&point);

Which will give you the current mouse position in screen coordinates

Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...

Daniel132419-Jan-04 0:51

Daniel1324

19-Jan-04 0:51

Thanks to all of you. That worked.

Can My Window Receive Messages

фил21-Jan-04 4:50

фил

21-Jan-04 4:50

some times MFC drives me so nuts that i use SDK procs.

CPoint cpPoint;
GetCursorPos(&cpPoint);

SetWaitableTimer

Mikey_E18-Jan-04 10:23

Mikey_E

18-Jan-04 10:23

I'm trying to set a waitable timer from a CTime object. So I'm doing converstion from CTime to SYSTEMTIME then to a FILETIME and finally to a LARGE_INTEGER structure so I can pass it to SetWaitableTimer.

This compiles and runs, however my timer fires immediately every time. It's completely ignoring the time to fire on. Am I making these converstions wrong or just completely flubbing the whole thing up? I'm lost, any help would be very appreciated!!

CTime m_tNextRun(Schedule.GetNextRunTime());
// Convert m_tNextRun to a SYSTEMTIME structure
SYSTEMTIME m_st_DueTime;
m_tNextRun.GetAsSystemTime(m_st_DueTime);

// Convert m_st_DueTime to a FILETIME structure
FILETIME m_ft_DueTime;
::SystemTimeToFileTime(&m_st_DueTime, &m_ft_DueTime);

// Copy m_ft_DueTime into a LARGE_INTEGER structure
LARGE_INTEGER m_lg_DueTime;
m_lg_DueTime.LowPart = m_ft_DueTime.dwLowDateTime;
m_lg_DueTime.HighPart = m_ft_DueTime.dwHighDateTime;

// Set the next timer
if(!::SetWaitableTimer(handles[command_timer], &m_lg_DueTime,0, NULL, NULL, 0)) {
// Set timer failed, handle the error
DEBUG_LOG("CSleeperThread::run(): set waitable timer failed.");
}

// suspend until the timer expires
::WaitForMultipleObjects(2, handles, FALSE, INFINITE);

Mike Ellertson

Re: SetWaitableTimer

Mike Dimmick18-Jan-04 23:39

Mike Dimmick

18-Jan-04 23:39

I don't see anything wrong with it. I assume you've already called CreateWaitableTimer?

What's the return value of WaitForMultipleObjects?

Re: SetWaitableTimer

Mikey_E19-Jan-04 10:17

Mikey_E

19-Jan-04 10:17

The return value of WaitForMultipleObjects is the index of the timer(which is what it should be).

If you look at SetWaitableTimer on MSDN the second parameter specifies the alarm date for the timer. Only thing, it's a LONG_INTEGER structure that your supposed to set using the FILETIME format.

I'm pretty sure I'm setting up this format wrong. Does anyone have a good conversion routine from a CTime object to a LONG_INTEGER used by SetWaitableTimer? Or have any advice on setting this FILETIME format?

Re: CSleeperThread

Clem8628-Mar-08 2:45

Clem86

28-Mar-08 2:45

Hello,
About your article with the CSleeperThread's class and the functions :
static VOID CALLBACK TimerProc_Wrapper
VOID CALLBACK TimerProc
void ThreadMain();
void WakeUp();

How do you use those functions in the main in order to suspend the thread for 10s for example?
Thanks
Clément, french student

bitpusher18-Jan-04 9:40

bitpusher

18-Jan-04 9:40

Hello,

I'm trying to *Send* a message to a Dialog Bar window early on in the initialization of an app and I believe I'm crashing because the Dialog Bar has not been created yet. How can I test to ensure it's been created and can accept & process such messages? I try to get a safe Handle (or call GetActiveWindow()), but that's valid all the time. If I change the SendMessage to a PostMessage, everything works, but I do need a SendMessage for some execution timing later in the app. Any suggestions/help?

thanks! JennyP

<code>
........
CDiagGlobalSched *gl_sched = &(((CMainFrame *)AfxGetApp()->m_pMainWnd)->m_SchedDlgBar1);

if (ForceUpdate) {
	if (gl_sched->GetActiveWindow() != NULL) { // passes this test, then errors on the next line.
		gl_sched->SendMessage(WM_COMMAND, ID_UPDATE_SCHED_BAR);
	}
	return TRUE;
}
</code>

structs

[Anders]18-Jan-04 8:53

18-Jan-04 8:53

say i have a struct like this:

<br />
<br />
typedef struct {<br />
 char* text1;<br />
 char* text2;<br />
 ...<br />
 char* text25;<br />
}MYS,*PMYS;<br />

how can i access the struct like this?

<br />
PMYS pS=SomehowGetPtrToStruct();<br />
for (int i=0; i < MYS_TEXTCOUNT; i++)<br />
{<br />
char* text=pS[i];<br />
dosomething(text);<br />
}<br />

i dont want to get the items like this:

char* text=pS->text2;<br />

i also tried to do stuff like: char* text=pS+(sizeof(char*)*i); but i cant get it to work Confused | :confused:

markkuk18-Jan-04 10:18

markkuk

18-Jan-04 10:18

If you want to use the array syntax, use an array (or a std::vector). You could overload the [] operator for your struct if you want to obfuscate your code.

[Anders]18-Jan-04 11:23

18-Jan-04 11:23

i dont need to use the array syntax, i just need to access the members of the struct without using the names

Ian Darling18-Jan-04 11:30

Ian Darling

18-Jan-04 11:30

[Anders] wrote:
i dont need to use the array syntax, i just need to access the members of the struct without using the names

But that's exactly what you want to do Confused | :confused:

ps[i] = use of array syntax

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Message Closed

18-Jan-04 11:37

18-Jan-04 11:37

Message Closed

modified 20-Feb-22 19:24pm.

Ian Darling18-Jan-04 12:43

Ian Darling

18-Jan-04 12:43

[Anders] wrote:
yeah but I tought there was some fancy way of doing it with a ptr like this char* text=pS+(sizeof(char*)*i);

No, because all you're doing is adding sizeof(char) * i to the pointer value of pS, which would be a really messed up way of accessing an array of your MYS struct. If you really want to do stuff like that, you have to learn exactly what + does in the context of a pointer.

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Jörgen Sigvardsson18-Jan-04 11:20

Jörgen Sigvardsson

18-Jan-04 11:20

if you really want to be nasty, you have to recast the pS pointer as a char**.

char** p = reinterpret_cast<char**>(pS) Now p[0] points to text1, p[1] to text2, etc.

However, this may be totally nonportable. If this is to work, you have to be sure that text1 is aligned with the beginning of the struct. Also, if sizeof(char*) is not the same size as the member alignment "distance", you will run into trouble.

May I suggest a totally different structure? How about using std::vector<std::string> or are you not in control of the layout of this structure and associated functions? Messing with raw pointers like that is highly error prone and will most likely give rise to late debugging session...

--
Seraphim Shock. Gold for your ears.

[Anders]18-Jan-04 12:37

18-Jan-04 12:37

i think i have gotten it to work now, thanx (and yes i needed something nasty)

Rickard Andersson²⁰18-Jan-04 12:18

Rickard Andersson²⁰

18-Jan-04 12:18

Overload the [] operator?

Rickard Andersson
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