C / C++ / MFC Discussion Boards

Re: Convert int to wstring

Naveen10-Jun-08 22:36

Naveen

10-Jun-08 22:36

use _itow() function.

nave

[OpenedFileFinder]

Re: Convert int to wstring

CodingLover10-Jun-08 22:44

CodingLover

10-Jun-08 22:44

I try th following but give an error.

<br />
	int temp = m_bWRState;<br />
	wstring st;<br />
	_itow(temp, st, 10);<br />

'_itow' : cannot convert parameter 2 from 'std::wstring' to 'wchar_t *'

I appreciate your help all the time...
CodingLover Smile | :)

Re: Convert int to wstring

Cedric Moonen10-Jun-08 22:56

Cedric Moonen

10-Jun-08 22:56

The second parameter that the function accepts is a wchar array, not a wstring. It is totally different: a wstring is a specific class, and a wchar is a basic type (unsigned short). If you want it to work, you first have to create a wchar array, then pass it to the function and then store it in your string (it has an = operator to do that).

Anyway, this method is more a C approach than a C++ approach. If you use a wstring, I suggest that you also use a wstringstream, but that's just a matter of opinion Smile | :)

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Convert int to wstring

CodingLover10-Jun-08 23:02

CodingLover

10-Jun-08 23:02

Get the point Cedric.

Thanks a lot. Smile | :)

I appreciate your help all the time...
CodingLover Smile | :)

Re: Convert int to wstring

Cedric Moonen10-Jun-08 22:39

Cedric Moonen

10-Jun-08 22:39

You have to check if this works or not (didn't try it myself):

std::wstringstream streamVal;
streamVal << temp;
std::wstring strVal = streamVal.str();

Don't forget to #include <sstream>.

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Convert int to wstring

CodingLover10-Jun-08 22:52

CodingLover

10-Jun-08 22:52

Yep, it's work. Thanks a lot.

Can you tel me what is wrong with my previous attempt, Naveen directed me.

I appreciate your help all the time...
CodingLover Smile | :)

VLC control help(VC++ Dialog based aplication)

projectip10-Jun-08 21:51

projectip

10-Jun-08 21:51

Hi,
I have a main dialog that is shown when my application starts running.It consists of a VLCplayer control that streams the live video and plays it.I have another dialog with a second VLCcontrol which is displayed when I select a menu item.What I have to do is play the same live video in the second dialog too.But it doesn't work.I have added variables for the controls.Any ideas?

Re: VLC control help(VC++ Dialog based aplication)

Hamid_RT10-Jun-08 22:18

Hamid_RT

10-Jun-08 22:18

Why it doesnt work did you get any error?

Re: VLC control help(VC++ Dialog based aplication)

projectip10-Jun-08 23:23

projectip

10-Jun-08 23:23

thanks for your response.it worked after sometime.but now the problem is the first vlc plyer in the main dialog displays nothing after returning from the second.the second dialog too is programmed to play the video.i have a stop button in the second dialog .in that i have written code to stop the display in the second dialog.

Getting 3 characters from right in TCHAR variable

VCProgrammer10-Jun-08 21:44

VCProgrammer

10-Jun-08 21:44

Hi all,

If from a CString variable we want to get 3 characters from right we can use Right(3) api but for getting 3 characters from right in a TCHAR variable what function we should use.....

Can anybody help me in this....

Thanks in advance

Re: Getting 3 characters from right in TCHAR variable [modified]

Naveen10-Jun-08 22:02

Naveen

10-Jun-08 22:02

CString cs = _T("Some string");
TCHAR tcBuf[4] = {0};
_tcsncpy( tcBuf, (LPCTSTR)cs.Right(3), 3 );

nave

[OpenedFileFinder]

modified on Wednesday, June 11, 2008 6:10 AM

Re: Getting 3 characters from right in TCHAR variable

CPallini10-Jun-08 22:51

CPallini

10-Jun-08 22:51

TCHAR * szSource = _T("Hello world!");
TCHAR szTarget[4];
size_t len = _tcslen(szSource);
_tcscpy(szTarget, &szSource[len-3]);

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: Getting 3 characters from right in TCHAR variable

JudyL_MD11-Jun-08 1:51

JudyL_MD

11-Jun-08 1:51

FYI, VS does come with the source for MFC. Try looking in the CString source to see what CString::Right does.

Judy

Unhandled exception at 0x00000000

rp_suman10-Jun-08 21:37

rp_suman

10-Jun-08 21:37

Sometime I am getting the error message saying:

"Unhandled exception at 0x00000000 in MyApplication.exe: 0xC0000005: Access violation reading location 0x00000000." but it is not pointing to the source code line caused this violation.
If I break, callstack is pointing "00000000()".

In this case is there any setting in VC++ to detect the line which caused exception.

Otherwise I will debug manually to find out the place..

Regards,
Suman

--
"Programming is an art that fights back!"

Re: Unhandled exception at 0x00000000

Cedric Moonen10-Jun-08 21:38

Cedric Moonen

10-Jun-08 21:38

If you start your debugger, it should bring you to the problem (or to assembly code if no source can be found). From there, use the call stack to come back into your own code.

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Unhandled exception at 0x00000000

rp_suman10-Jun-08 21:41

rp_suman

10-Jun-08 21:41

Hi Cedric Moonen,

Thanks for your help!!
Sorry I modified the question, I am using debugger but callstack not showing source line.

Disassembly is showing address 00000000 and there are only question marks "????".

Thanks,
Suman

--
"Programming is an art that fights back!"

Re: Unhandled exception at 0x00000000

Cedric Moonen10-Jun-08 22:20

Cedric Moonen

10-Jun-08 22:20

How does your call stack look like. It seems that you are confusing call stack with something else... The call stack shows all the functions that have been called to reach the current point in the code. By walking the callstack, you can 'travel' back to where the problem is coming from.
For VC2005: "Debug" menu -> "Windows" -> "Call stack" (or Alt + 7) will display the call stack window if you are in debug mode and on a breakpoint.

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Unhandled exception at 0x00000000

rp_suman10-Jun-08 22:42

rp_suman

10-Jun-08 22:42

I used to look at callstack to trace the error always, but some cases like this, callstack is not showing any function but the arrow pointing to "00000000()" in callstack.

I think it means something out of callstack scope, or we have change some setting to break and show this exception in callstack

Regards,
Suman

--
"Programming is an art that fights back!"

Re: Unhandled exception at 0x00000000

Alan Balkany11-Jun-08 3:11

Alan Balkany

11-Jun-08 3:11

The error is making your call stack unreadable, so you need a different method to find the error. Use breakpoints to find the last statement executed before the error occurs. I'm predicting you're trying to use a NULL pointer.

Re: Unhandled exception at 0x00000000

Sameerkumar Namdeo10-Jun-08 21:49

Sameerkumar Namdeo

10-Jun-08 21:49

In the Debug Menu
Exceptions
do modification to some setting over there...

WM_PRINT

subramanyeswari10-Jun-08 21:22

subramanyeswari

10-Jun-08 21:22

I am using WM_PRINT to print the control. But it is copying the content of the control not the screen shot of the control. I tried to use PrintWindow. But as i am working on VC6.0, not able to use.

Any help is appreciated.

Re: WM_PRINT

Naveen10-Jun-08 21:31

Naveen

10-Jun-08 21:31

subramanyeswari wrote:
But it is copying the content of the control not the screen shot of the control.

Sorry, I coudn't understand the diifference...What do you mean by "content of the contol" and "screen shot of the control".

subramanyeswari wrote:
I tried to use PrintWindow. But as i am working on VC6.0, not able to use.

In VC6 also you can use this function. For this either you have to import this function dynamically or you should install latest platform SDK( it is free Smile | :)

nave

[OpenedFileFinder]

Re: WM_PRINT

subramanyeswari10-Jun-08 21:38

subramanyeswari

10-Jun-08 21:38

I have a grid in the control. It is capturing the data in the grid but it is not capturing the grid. I mean the grid is not displayed.

Regards

Re: WM_PRINT

Naveen10-Jun-08 21:48

Naveen

10-Jun-08 21:48

So how did you draw your grid and data( data means text, right? ). In OnPaint() ?

nave

[OpenedFileFinder]

Re: WM_PRINT

subramanyeswari10-Jun-08 22:25

subramanyeswari

10-Jun-08 22:25

my main(CAlarmObject) class is derived from CObject. i have a class (CWiZListCTRL)and that is derived from CListCtrl. and drawing is taken place in the OnPaint of CWiZListCTRL. and i am calling that in my main(CAlarmObject) draw method

Regards

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.