ThatsAlok6-Jun-06 18:13

6-Jun-06 18:13

gomez_a wrote:
How can I get a HBITMAP, when I have only CBitmap bmp3?

CBitmap::operator HBITMAP

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Shared Memory Writing

velayudhan_raj6-Jun-06 1:03

velayudhan_raj

6-Jun-06 1:03

Hi Guys,
A structure,which consists of member variables ( eg: int, float data type ) is written in a shared memory from a BackEnd application, which is accessed by a Front End application. When I try to write a Cstring variable or TCHAR array as member variable of the structure, it is not working, and exception occurs. Actually my need is to write a string to shared memory - from Back end, which is accessed by Front End. The string should be a member of this structure. So plz help me what datatype to be used.

Thanks in Advance
Velayudhan

Re: Shared Memory Writing

Laxman Auti6-Jun-06 1:13

Laxman Auti

6-Jun-06 1:13

velayudhan_raj wrote:
A structure,which consists of member variables ( eg: int, float data type ) is written in a shared memory from a BackEnd application, which is accessed by a Front End application. When I try to write a Cstring variable or TCHAR array as member variable of the structure, it is not working, and exception occurs. Actually my need is to write a string to shared memory - from Back end, which is accessed by Front End. The string should be a member of this structure. So plz help me what datatype to be used.

Try Char* instead. Smile | :)

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: Shared Memory Writing

velayudhan_raj6-Jun-06 1:15

velayudhan_raj

6-Jun-06 1:15

Actually I am working in Unicode support application. so I tried with TCHAR* , but it is not working.
A doubt : CString can't be written in Shared memory, as we cannot define the size of CString , Is it correct?

Re: Shared Memory Writing

ThatsAlok6-Jun-06 1:57

ThatsAlok

6-Jun-06 1:57

velayudhan_raj wrote:
Actually I am working in Unicode support application. so I tried with TCHAR* , but it is not working.

Give Specfic Size to the String Member, i.e. USE TCHAR youObj[100];

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Re: Shared Memory Writing

Viorel.6-Jun-06 1:29

Viorel.

6-Jun-06 1:29

A possible solution is to define a fixed-size array within your shared structure, for instance: TCHAR mName[100]. The size of the array must be large enough. Now for string-transfer operations use string-manipulation functions like strcpy in non-Unicode or wcscpy in Unicode mode. (If you use lstrcpy or StrCpy, then they will work in both modes).

Unfortunately, this is problematic to use if you cannot predict and limit the largest size of your string.

Re: Shared Memory Writing

Hamid_RT6-Jun-06 1:41

Hamid_RT

6-Jun-06 1:41

See Here[^] maybe it is some helpful to you

whitesky

Re: Shared Memory Writing

James R. Twine6-Jun-06 3:13

James R. Twine

6-Jun-06 3:13

If the two applications are complete separate processes, you cannot just share pointers between the two of them. If the shared memory segment is coherent between both processes, you can simply use a portion of it as a buffer for text/string data. You can then pass offsets into the buffer to specify data locations.

Or, you can change the structure to contain a proper array and copy the entire structure to the shared memory area:

struct sMyData
{
    double m_dValue;
    char   m_cValue;
    char   m_caValue[ 128 ];
    int    m_iValue;
};

When moving data between processes via some kind of shared memory implementation, you should generally avoid pointers and "real" objects.

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!
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Kernal32.lib .....Error at run

zahid_ash6-Jun-06 0:55

zahid_ash

6-Jun-06 0:55

I have created a simple WIN32 Consol application that prints a message "hi how are you"

It compiles fine , but when I run it it gives
Fatal error Kernal32.lib required

how it can be removed

Regards.

Re: Kernal32.lib .....Error at run

_AnsHUMAN_ 6-Jun-06 1:04

_AnsHUMAN_

6-Jun-06 1:04

Under project settings>Linkd>object library modules check if kernel32.lib exists.
If not add it.
Could be some other issue?

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Kernal32.lib .....Error at run

David Crow6-Jun-06 3:31

David Crow

6-Jun-06 3:31

zahid_ash wrote:
Fatal error Kernal32.lib required

You are receiving this message at run-time? Confused | :confused:

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

compiler creation

c076-Jun-06 0:46

c07

6-Jun-06 0:46

I'm trying to develop compiler with flex and bison....
does anybody have tutorial or ebook on buidling compiler with flex and bison on visual c++

Thank you....

Re: compiler creation

Sarath C6-Jun-06 1:01

Sarath C

6-Jun-06 1:01

Using Flex and Bison[^]

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: compiler creation

c076-Jun-06 4:00

c07

6-Jun-06 4:00

Hi,

Thanx for info....but do you have information related to MS visual c++

Regards

Mouse move event

RajiRaghu6-Jun-06 0:43

RajiRaghu

6-Jun-06 0:43

I used the following code. But it does not take the correct column (subitem).

The part of code is in OnMouseMove event:
void CListt::OnMouseMove(UINT nFlags, CPoint point)
{
CPoint pt(point);
ScreenToClient(&pt);
LVHITTESTINFO hitInfo;
hitInfo.pt = point;
int nItem = -1;
nItem = m_list.SubItemHitTest(&hitInfo);
if (nItem >= 0)
{
m_list.SetItemState(nItem, LVIS_SELECTED, LVIS_SELECTED);
}

if (nItem >= 0 && hitInfo.iSubItem > 0)
{
int m_nSubItemHit = hitInfo.iSubItem;
if ( hitInfo.iSubItem == 8)
SetCursor(hCursor);
}
}

I need to change the cursor if subitem is "8". But even if move the mouse on the 8th subitem, the value of hitInfo.iSubItem is some thing else. moreover nItem is always -1.

Any clues please

Thanks
Raji

conversion to _bstr_t - newbie

antonaras6-Jun-06 0:29

antonaras

6-Jun-06 0:29

Hi guys

can i convert

integers and doubles to _bstr_t;
if yes can you tell me how

thanks a lot

Re: conversion to _bstr_t - newbie

Sarath C6-Jun-06 0:37

Sarath C

6-Jun-06 0:37

_bstr_t is a type which can hold unicode string.

CString strText;
// format the value to CString
strText.Format("%d",nValue);
call strText.AllocSysString(); to convert

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: conversion to _bstr_t - newbie

ThatsAlok6-Jun-06 0:58

ThatsAlok

6-Jun-06 0:58

SaRath C wrote:
_bstr_t is a type which can hold unicode string.

you getting very fast Smile | :)

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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Re: conversion to _bstr_t - newbie

ThatsAlok6-Jun-06 1:02

ThatsAlok

6-Jun-06 1:02

SaRath C wrote:
call strText.AllocSysString(); to convert

there can Memory Leak problem here!

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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Re: conversion to _bstr_t - newbie

ThatsAlok6-Jun-06 0:43

ThatsAlok

6-Jun-06 0:43

antonaras wrote:
integers and doubles to _bstr_t;

//Integer
TCHAR szStr[100];
wsprintf(szStr,"%d",100);
_bstr_t bstText(szStr);

//Float
TCHAR szStr[100];
wsprintf(szStr,"%f",100.10);
_bstr_t bstText(szStr);

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: conversion to _bstr_t - newbie

Sarath C6-Jun-06 0:49

Sarath C

6-Jun-06 0:49

ThatsAlok wrote:
TCHAR szStr[100];
wsprintf(szStr,"%d",100);

I think type defined by TCHAR has dependency to the current build environement(unicode/ MBCS). The compiler will define char array instead of unicode character array (wchar_t)in an MBCS environment. so there is a chance for error. I think, when it is better to declare wchar_t array instead of declaring TCHAR array since we are using wsprintf for formatting. what do u think?

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: conversion to _bstr_t - newbie

ThatsAlok6-Jun-06 0:57

ThatsAlok

6-Jun-06 0:57

SaRath C wrote:
I think type defined by TCHAR has dependency to the current build environement(unicode/ MBCS). The compiler will define char array instead of unicode character array (wchar_t)in an MBCS environment. so there is a chance for error.

Actually TCHAR is defined as :-

#ifdef UNICODE
 #define TCHAR wchar_t
 #else
 #define TCHAR char
 #endif

so you can use in both Character set. plus little mistake from my side too, wsprintf should be written something like this to make it character set independent

 wsprintf(szChar,_T("%d"),100);

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

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Re: conversion to _bstr_t - newbie

antonaras6-Jun-06 0:55

antonaras

6-Jun-06 0:55

Thanks ThatsAlok
I'm getting there is almost working

how about doubles?

Appreciate the help

Re: conversion to _bstr_t - newbie

Sarath C6-Jun-06 0:59

Sarath C

6-Jun-06 0:59

You will get the expected string depends on the format specifier you are specifying
http://msdn2.microsoft.com/en-us/library/75w45ekt.aspx[^]

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: conversion to _bstr_t - newbie

ThatsAlok6-Jun-06 1:01

ThatsAlok

6-Jun-06 1:01

antonaras wrote:
how about doubles?

use %e format

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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C / C++ / MFC

CBitmap::operator HBITMAP