C / C++ / MFC Discussion Boards

Re: What the best way to sleep 1 ms

namaskaaram3-May-05 2:58

namaskaaram

3-May-05 2:58

getting a precise value in the microsecond range in windows is practically not possible ,taking into account that it handles many task at a time,since windows aint an real time os.....aint it?????

"faith, hope, love remain, these three.....; but the greatest of these is love" -1 Corinthians 13:13

Re: What the best way to sleep 1 ms

Alexander ^M.,3-May-05 3:57

Alexander ^M.,

3-May-05 3:57

When the process and thread priority is at realtime level windows is almost like a real-time os.
(not in timing, but you can implement a wait timer yourself by creating a loop and comparing the time differences!!!)

Don't try it, just do it! Wink | ;-)

Re: What the best way to sleep 1 ms

toxcct3-May-05 5:19

toxcct

3-May-05 5:19

hem sorry mista rateepzzzzzzzzzz,

i'm a bit off topic, but 1 ms is 1 milli-second for me, while 1 micro-second is written 1 µs...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: What the best way to sleep 1 ms

namaskaaram3-May-05 18:03

namaskaaram

3-May-05 18:03

like duh!!!!! Laugh | :laugh:

......

ahem...sorry mr toxxxxxxxxcit,

i am not off thiz topic;) ,coz my bachelors happen to be in electronics &communication......

well i was wondering if microsec precision is possible with the QueryPerformance function taking into account that the windows aint an rtos system......my question seem to have just popped up when thiz question abt millisecond was put into,.....itz not the issue or misunderstanding of millisec,or pico sec,or nano sec or whatever!!!!!;)

cheerz..... Big Grin | :-D

"faith, hope, love remain, these three.....; but the greatest of these is love" -1 Corinthians 13:13

Re: What the best way to sleep 1 ms

James R. Twine3-May-05 3:35

James R. Twine

3-May-05 3:35

The best way is to run under a real-time OS...! Smile | :)

Seriously, I think that the solution given to use the QueryPerformance*(...) functions (also check out the multimedia timers) in a tight loop would do it for you. You might have to worry about the cases where your qauntum expires during the execution of the loop, though.

Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Tip for new SUV drivers: Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
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Re: What the best way to sleep 1 ms

Tim Smith3-May-05 3:37

Tim Smith

3-May-05 3:37

But doing such a thing makes you a bad windows user.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: What the best way to sleep 1 ms

toxcct3-May-05 5:21

toxcct

3-May-05 5:21

oh really ?! Unsure | :~

do you know hardware programming ? Suspicious | :suss:

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: What the best way to sleep 1 ms

James R. Twine3-May-05 6:23

James R. Twine

3-May-05 6:23

I think he was referring to my line:

"The best way is to run under a real-time OS...! Smile | :)

"

Otherwise he would have said "bad Windows developer", not "user". :P

Peace!

-=- James

Re: What the best way to sleep 1 ms

Tim Smith3-May-05 17:43

Tim Smith

3-May-05 17:43

Yes. I have been doing process control and industrial automation for many years. I have worked on my embedded processor systems (not just WinCE) and have written many device drivers for different hardware platforms (Z-80 using CPM, 68k running PDOS(?), 386 using only god knows what).

Doing anything in a tight loop testing any type of flag without resolving to a kernel waitable object is a bad idea. It will lock other applications out of the CPU. Even spinlocks will only loop for a very limited amount of time prior to resorting to a kernel object.

I would question the overall design if someone needed to do such a thing. There are cases where that level of timing is needed, but as already stated user mode isn't a good place to do such things. Thus, even if he could get it to work, it wouldn't be reliable in the real world.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: What the best way to sleep 1 ms

Abu Mami3-May-05 6:20

Abu Mami

3-May-05 6:20

Have children.

Water-wall

DinaMazor3-May-05 1:19

DinaMazor

3-May-05 1:19

I need an opaque dialog or bitmap for demo version. The GUI is in written in MFC. I need something over all dialogs with opaque letters DEMO.
What can you suggest me,
thanx Dina

Dina

Re: Water-wall

QuiJohn3-May-05 2:01

QuiJohn

3-May-05 2:01

Use OnEraseBkgrnd to replace the background color with a bitmap of your choice? That might be the easiest way.

Re: Water-wall

Blake Miller3-May-05 7:38

Blake Miller

3-May-05 7:38

Draw directly to the user's screen?
Writing DEMO all over the place?

hide from application list

3-May-05 0:42

i want to know that how to hide the application from appplication list when we press the Ctrl+alt+delete. i want to do this in the visual c6.

ddd

Re: hide from application list

ThatsAlok3-May-05 1:00

ThatsAlok

3-May-05 1:00

http://www.codeproject.com/system/preventclose.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

Can't compile function template on VC7.1

Teerayoot2-May-05 23:48

Teerayoot

2-May-05 23:48

i want to compile this code :

<br />
template <class T> <br />
inline const T& max ( const T& a,  const T& b) <br />
{ <br />
		return a < b ? b : a ; <br />
<br />
<br />
}<br />

got this error message :
: error C2226: syntax error : unexpected type 'T'
: error C2062: type 'const int' unexpected
: error C2059: syntax error : ')'
: error C2143: syntax error : missing ';' before '{'
: error C2447: '{' : missing function header (old-style formal list?)

but it's successfully compiled on BCB6.0 .
VC7.1 is just stupid???

Re: Can't compile function template on VC7.1

ThatsAlok2-May-05 23:59

ThatsAlok

2-May-05 23:59

Teerayoot wrote:
template
inline const T& max ( const T& a, const T& b)
{
return a < b ? b : a ;

}

put above code in header file !

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

cheers,
Alok Gupta

Re: Can't compile function template on VC7.1

Rahim Rattani3-May-05 0:25

Rahim Rattani

3-May-05 0:25

try using as

template<typename T><br />
inline const T& getMax ( const T& a, const T& b) <br />
{ <br />
return a < b ? b : a ; <br />
}

The problem is with the name of the function. I have renamed it from "max" to "getMax" because macros with the name "min" and "max" already exist in stdlib.h, and same name of the function as those macros caused the errors.

Rahim Rattani
Software Engineer,
Matrix Systems (Pvt) Ltd.,
Karachi - Pakistan

Re: Can't compile function template on VC7.1

Teerayoot3-May-05 2:07

Teerayoot

3-May-05 2:07

Error message make me very confuse.

it should say
"name of the function max alredy exist in standard library!"
or somethings that can make sense.

Smile | :)

Thank you.

How to do this????

eli150219792-May-05 23:41

eli15021979

2-May-05 23:41

Hi,
i know that i can set each of the incoming parameters of my function to a default value, like this:

void Function(int x , int y = 10);

and then,i can call to the function in 2 ways:

Function(10,20); //x = 10 , y = 20
Function(10);    //x = 10 , y = 10

my question is - how can i set a CString object to empty by default?
for example:

void Function(int x , CString string = ???????);

and call that function:

Function(10,"Not an empty string"); // x = 10 , string = "Not an empty string"
Function(10); // x = 10 , string = string.Empty()

anyone???????? D'Oh! | :doh:

Regards,
Eli

Re: How to do this????

Rahim Rattani2-May-05 23:57

Rahim Rattani

2-May-05 23:57

As smple as u set the integer values.

void Function( int x , CString string = "" );

Rahim Rattani
Software Engineer,
Matrix Systems (Pvt) Ltd.,
Karachi - Pakistan

Re: How to do this????

toxcct3-May-05 0:10

toxcct

3-May-05 0:10

eli15021979 wrote:
my question is - how can i set a CString object to empty by default?
for example:
void Function(int x , CString string = ???????);

and call that function:
Function(10,"Not an empty string"); // x = 10 , string = "Not an empty string"

why don't you do the same as you code with integers...?

<font color=blue>void</font> Function(<font color=blue>int</font> x , CString string = <font color=gray>""</font>);

Then you call it the way you like...

Function(10, <font color=gray>"Hello CP"</font>);    <font color=green>// Function(10, "")</font>
Function(10);                <font color=green>// Function(10, "Hello CP")</font>

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: How to do this????

Blake Miller3-May-05 8:04

Blake Miller

3-May-05 8:04

Also, you need to decide if the function accepting the CString really REQUIRES a CString object.

Maybe you can get by with a LPCTSTR instead.

Then you can write your function:
void Function(int x , LPCTSTR szString = NULL);

and call that function:

Function(10, "Not an empty string"); // x = 10 , szString != NULL<br />
Function(10); // x = 10 , szString = NULL

You can get really tweaked after awhile working with code all written to accept a CString by value, and then when you examine the function's use of the string, it could have easily sufficed to send it a string constant instead.

Group calendar control ?

Bernhard2-May-05 23:39

Bernhard

2-May-05 23:39

Is there any Group Calender control available (preferably as a MFC Control)?
(Commercial or Non - Commercial)

Something like http://www.officeclip.com/web/calendar/tour3.html
and the OfficeClip Group Calendar - Invite Attendees - Picture (the one down the site).

I should see the appointments of a group of people and (ideally) someone should be able to dynamically drag an appointment and move it to another date / time.

Any help appreciated.

All the label says is that this stuff contains chemicals "... known to the State of California to cause cancer in rats and low-income test subjects."
Roger Wright
http://www.codeproject.com/lounge.asp?select=965687&exp=5&fr=1#xx965687xx

SetWindowRgn() for buttons

Asha Udupa2-May-05 23:24

Asha Udupa

2-May-05 23:24

Hi
I am trying to set a region for buttons. here is code:

CRect the_rect;
m_SearchBtn->GetClientRect(the_rect);
HRGN region_handle = CreateEllipticRgnIndirect(the_rect);
int nRet=m_SearchBtn->SetWindowRgn(region_handle,TRUE);

nRet value is always non-zero. But still the button shape won't change. Could anyone tell me what is wrong?

Regards

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