Re: Conversion from integer to string - C / C++ / MFC Discussion Boards

MJPEG question

cristane12-May-04 4:45

cristane

12-May-04 4:45

Hi, I have a question.

Is there any way to play a MJPEG file with Windows Media Player?

Thanks

Re: MJPEG question

C^hris L^osinger12-May-04 4:59

C^hris L^osinger

12-May-04 4:59

yes. but you'll need an MJPEG codec to do it. there are many commercial codecs available... don't know of any free ones...

Cleek | Jewelry | ClickPic | ThumbNailer

Help for mschart problem!

allen_homer12-May-04 4:35

allen_homer

12-May-04 4:35

Dear Expert,
I'm a mschart control newbie. Here are 3 Questions needed your help.

(below is supposing to use this contorl in VB , you can also use it in VC, or other windows program tools capable of using this ActiveX controls, the encountered problem is same)

Q1: When I set *.ChartType=VtChChartType2dXY, How can I set X-asis Label to
my own expected string instead of Xas automatic generated by
itself.(Such as datetime instead of "0 1 2 3 ...")

Q2: Both when *.ChartType=VtChChartType2dXY or VtChChartType2dLine,
and when Xas Lable string is too long , How can I display it in Multi-line

Q3: When *.ChartType=VtChChartType2dLine , and after I set xasis.tick.style=...Inside,
& xasis.tick.length=200, it does not take effect, nothing changes , and what I expected to occur does not occur

In sum, What I want to do is by using mschart (must , cant use any other 3rd party controls),
set xasis infos(such as label , tick style, length) customarily by my expected format

Thanks in advance , Expecting your answer!
Allen, Homer

Conversion from integer to string

jazzlycool12-May-04 4:08

jazzlycool

12-May-04 4:08

Hi!! I need some help here.

How to convert an integer variable to string so that the string and the variable can be concatenated. The string will be displayed in the edit control.

Thanks

jazzlycool

Re: Conversion from integer to string

jmkhael12-May-04 4:14

jmkhael

12-May-04 4:14

CString str;
str.Format("%d", intValue);

char acBuffer[16] = {0};
sprintf(acBuffer, "%d", intValue);

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Conversion from integer to string

bikram singh12-May-04 4:25

bikram singh

12-May-04 4:25

Without using MFC:

int  Number = 178;<br />
char szString[50];<br />
<br />
wsprintf(szString,"%d",Number); /*gives the string in decimal : "178"*/

or
itoa(Number,szString,10); /*gives the string in decimal : "178"*/
or
itoa(Number,szString,2); /*gives the string in binary : "10110010"*/

~Bikram~

Re: Conversion from integer to string

jazzlycool12-May-04 4:56

jazzlycool

12-May-04 4:56

Thanks for helping me.

jazzlycool

Re: Conversion from integer to string

Rafael Fernández López12-May-04 11:04

Rafael Fernández López

12-May-04 11:04

CString my_string;
int my_int = 54;

my_string.Format("The value is: %d", my_int);

Written by: Rafael Fernández López.

Visit: http://www.maestroprogramador.com

isValidDoubleValue(double *)

Tibor Blazko12-May-04 3:58

Tibor Blazko

12-May-04 3:58

is there any (system) function can test memory pointer to know combination of bits there is real (double, float) value?

something like this
if(isValidDoubleValue(dptr))
dvalue = 0.0;
else
dvalue = *dptr; //always no exception crash here

what will not crash
(all i found (like _isnan) expect given bit combination represents valid state and crashes getting invalid one)

thanks

Re: isValidDoubleValue(double *)

jmkhael12-May-04 4:20

jmkhael

12-May-04 4:20

Check IsBadReadPtr to guaranty that you have read access to the memory pointed by dptr

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: isValidDoubleValue(double *)

Tibor Blazko12-May-04 4:22

Tibor Blazko

12-May-04 4:22

yes, but it does not guarantee will not crash next
doublevalue = *ptr;

Re: isValidDoubleValue(double *)

jmkhael12-May-04 4:28

jmkhael

12-May-04 4:28

If you have read access, it wont crash
will it?

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: isValidDoubleValue(double *)

Tibor Blazko12-May-04 4:39

Tibor Blazko

12-May-04 4:39

sometimes will
_FPE_INVALID

Re: isValidDoubleValue(double *)

jmkhael12-May-04 4:53

jmkhael

12-May-04 4:53

After gaining read access, check for Floating point exceptions

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: isValidDoubleValue(double *)

Tibor Blazko12-May-04 4:57

Tibor Blazko

12-May-04 4:57

it seems it will end with own fn of this kind
just afraid with big data will be exception handling

Re: isValidDoubleValue(double *)

Jens Doose12-May-04 4:54

Jens Doose

12-May-04 4:54

Never heard of that, but a look at MSDN with _FPE_INVALID lead me to SIGFPE
and that lead me to signal(), a function you can use to set your own signal handler.
I never tried that but maybe this is worth a try?

Jens

Re: isValidDoubleValue(double *)

Tibor Blazko12-May-04 4:59

Tibor Blazko

12-May-04 4:59

it seems it will end with own fn of this kind
just afraid with big data will be exception handling slow

Re: isValidDoubleValue(double *)

David Crow12-May-04 4:38

David Crow

12-May-04 4:38

Tibor Blazko wrote:
is there any (system) function can test memory pointer to know combination of bits there is real (double, float) value?

None that I know of. What's stored at a particular memory location is only important to the application that put it there. In other words, if application A wrote 123.45 to some memory location, it's possible (not to be confused with easy or commonplace) for application B to read that memory location, but application B would not know that those particular bytes represented a double or float.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: isValidDoubleValue(double *)

Tibor Blazko12-May-04 4:40

Tibor Blazko

12-May-04 4:40

i know it should represent double
just have data with some uninitialized values (sometimes not valid doubles)
and this (crashing ones) i want set to 0.0 in correction step nr.1

Re: isValidDoubleValue(double *)

Chris Meech12-May-04 6:50

Chris Meech

12-May-04 6:50

I'm might be missing something here, but if it just uninitialised variables, the following might help you out.

try
{
  dValue  =  *dPtr;
}
catch( . . . )
{
  dValue  =  0.0;
}

Chris Meech

We're more like a hobbiest in a Home Depot drooling at all the shiny power tools, rather than a craftsman that makes the chair to an exacting level of comfort by measuring the customer's butt. Marc Clifton

VB is like a toolbox, in the hands of a craftsman, you can end up with some amazing stuff, but without the skills to use it right you end up with Homer Simpson's attempt at building a barbeque or his attempt at a Spice rack. Michael P. Butler

Re: isValidDoubleValue(double *)

Tibor Blazko12-May-04 22:36

Tibor Blazko

12-May-04 22:36

yes, it seems it will end this way
just comment if someone will read this:
call _clearfp (or similar) before = 0.0
t!

Re: isValidDoubleValue(double *)

Tim Smith12-May-04 11:05

Tim Smith

12-May-04 11:05

Take a look at _isnan, _finite and _fpclass.

Tim Smith

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

catching events that are outside my program

caykahve12-May-04 3:19

caykahve

12-May-04 3:19

Hi,

I want to be able to catch any mouse and keyboard event from my MFC program.

The PreTranslateMessage(MSG* pMsg) function helps catching keyboard events that happen when the application window is active and for mouse events the mouse should also be over the application window.

I think there should be some way to do it.

What I actually want to do is to associate this with a timeout event. Just like the timeout windows uses to activate a screensaver. So I want to know the last time any mouse or keyboard event has occured. Frown | :(

I will be very grateful if someone could tell me how to do it.

Thanks...

Re: catching events that are outside my program

jmkhael12-May-04 3:27

jmkhael

12-May-04 3:27

Check SetWindowsHookEx

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

why splitter window fail?

vividtang12-May-04 2:55

vividtang

12-May-04 2:55

i want splitter window like the style |---

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/,
CCreateContext* pContext)
{
if(!(m_wndSplitter.Create(this,1, 2, CSize(10, 10),pContext))) return FALSE;

else
if (!(m_wndSplitter1.CreateStatic(&m_wndSplitter,2,1,WS_CHILD|WS_VISIBLE,m_wndSplitter.IdFromRowCol(0,1))))

return FALSE;
}

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