C / C++ / MFC Discussion Boards

Re: Append BStr

CPallini13-May-09 1:33

CPallini

13-May-09 1:33

Mogaambo wrote:
dude you haven't added +2 bytes

I know, I don't need to (I'm using SysAllocStringLen, not SysAllocStringByteLen).

Mogaambo wrote:
it is crashing as that of mine, but when i added +2 it is running fine

This is very strange.

Mogaambo wrote:
so whenever i want allocate BSTR do i have 2 add + bytes

Nope. Even if your point about the crash is true (and is true, I know) this is a wrong conclusion.
Smile | :)

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

[My articles]

Re: Append BStr

CPallini13-May-09 2:08

CPallini

13-May-09 2:08

I made a silly error in my code, now fixed (please see again the posted snippet).
It should be OK now, the following test runs fine:

BSTR dest = SysAllocString(L"Hi ");
BSTR s1,s2,s3,s4;
s1 = SysAllocString(L"People, ");
s2 = SysAllocString(L"How do ");
s3 = SysAllocString(L"you ");
s4 = SysAllocString(L"do?");
HRESULT hr;
hr = StringAppend(&dest, s1);
hr = StringAppend(&dest, s2);
hr = StringAppend(&dest, s3);
hr = StringAppend(&dest, s4);

MessageBoxW(dest, L"Info");

SysFreeString(s1);
SysFreeString(s2);
SysFreeString(s3);
SysFreeString(s4);
SysFreeString(dest);

Re: Append BStr

Mogaambo13-May-09 2:37

Mogaambo

13-May-09 2:37

If you run your code in debug mode , it crashes at line where you freeing the variable, but runs in release mode.

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: Append BStr

CPallini13-May-09 2:43

CPallini

13-May-09 2:43

My test works fine in DEBUG mode on my machine. What inputs are you providing?
Smile | :)

Re: Append BStr

«_Superman_»12-May-09 21:52

«_Superman_»

12-May-09 21:52

I recommend CComBSTR::AppendBSTR or _bstr_t::operator+

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Append BStr

KarstenK12-May-09 22:25

KarstenK

12-May-09 22:25

why are you modifying a const input parameter ie deleting Mad | :mad:

Press F1 for help or google it.
Greetings from Germany

Re: Append BStr

Mogaambo12-May-09 22:28

Mogaambo

12-May-09 22:28

KarstenK wrote:
why are you modifying a const input parameter ie deleting Mad

if i do not free all the memory gets exhausted.

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: Append BStr

Rajesh R Subramanian12-May-09 22:37

Rajesh R Subramanian

12-May-09 22:37

If it had to be released from within the function, why does it come into the function as a const parameter? Isn't this strikingly flashy, yelling "Hey look! I'm the silliest!"?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Append BStr

KarstenK12-May-09 22:41

KarstenK

12-May-09 22:41

To free up the strings is correct and necessary, BUT NOT in a subroutine. Make it after the sub routine call. D'Oh! | :doh:

Press F1 for help or google it.
Greetings from Germany

Re: Append BStr

Mogaambo12-May-09 22:51

Mogaambo

12-May-09 22:51

This my calling code tell me where do i free

BSTR GetNewRow()
{
value=GetLoggedInUser();

BSTR strComma=::SysAllocString(L",");
BSTR strNewLine=::SysAllocString(L"\n");

value=StringAppend(value,strComma);

value=StringAppend(value,strCategory);
value=StringAppend(value,strComma);
value=StringAppend(value,strItemName);
value=StringAppend(value,strComma);
value=StringAppend(value,strInstallDate);
value=StringAppend(value,strComma);
value=StringAppend(value,strVersion);
value=StringAppend(value,strComma);
value=StringAppend(value,strValue1);
value=StringAppend(value,strComma);
value=StringAppend(value,strValue2);
value=StringAppend(value,strComma);
value=StringAppend(value,strValue3);
value=StringAppend(value,strNewLine);

::SysFreeString(strComma);
::SysFreeString(strNewLine);

return value;
}

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: Append BStr [modified]

Madhu Nair12-May-09 22:55

Madhu Nair

12-May-09 22:55

Mogaambo wrote:

BSTR strComma=::SysAllocString(L",");
BSTR strNewLine=::SysAllocString(L"\n");

What about changing BSTR to _bstr_t ?
Defined in comutil.h

The MSDN link says that,

A _bstr_t object encapsulates the BSTR data type. The class manages resource allocation and deallocation through function calls to SysAllocString and SysFreeString and other BSTR APIs when appropriate. The _bstr_t class uses reference counting to avoid excessive overhead.

--++++++---

Use the += operator of _bstr_t to append characters to the end.

if value is also declared as a type of _bstr_t then code can be re-written as,

value += strComma;
value += strNewLine;

modified on Wednesday, May 13, 2009 5:12 AM

Re: Append BStr

Mogaambo12-May-09 23:51

Mogaambo

12-May-09 23:51

Thanks to all programming bees in helping me to solve my problems.

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: Append BStr

KarstenK12-May-09 23:47

KarstenK

12-May-09 23:47

this is very lame code. You better make at first the output string with CString (or otherwise) and at last ::SysAllocString() Roll eyes | :rolleyes:

Press F1 for help or google it.
Greetings from Germany

Re: Append BStr

Mogaambo13-May-09 1:20

Mogaambo

13-May-09 1:20

What code you have written if you have to append the BSTR. It's a humble request from programmer to professional.

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: Append BStr

KarstenK13-May-09 1:59

KarstenK

13-May-09 1:59

I would first make a complete string in a CString or TCHAR-array and at last create a BSTR.

Press F1 for help or google it.
Greetings from Germany

hi plz help me

priyakp12-May-09 21:01

priyakp

12-May-09 21:01

i need a vc++ program for playing an audio file

Re: hi plz help me

Madhu Nair12-May-09 21:05

Madhu Nair

12-May-09 21:05

Use PlaySound[^] API

PlaySound(TEXT("recycle.wav"), NULL, SND_FILENAME);

Re: hi plz help me

CPallini12-May-09 21:06

CPallini

12-May-09 21:06

Well, this forum is not exactly a software shop... Roll eyes | :rolleyes:

Re: hi plz help me

Naveen12-May-09 22:14

Naveen

12-May-09 22:14

nave

[OpenedFileFinder] [My Blog]

Get groups and the number of associated users in that group in a system ?

Mogaambo12-May-09 19:54

Mogaambo

12-May-09 19:54

How I get groups and the number of associated users in that group of a system.

Regards

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: Get groups and the number of associated users in that group in a system ?

«_Superman_»12-May-09 20:07

«_Superman_»

12-May-09 20:07

Check out NetGroupEnum and NetGroupGetUsers APIs.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Get groups and the number of associated users in that group in a system ?

Madhu Nair12-May-09 20:50

Madhu Nair

12-May-09 20:50

Mogaambo wrote:
How I get groups and the number of associated users in that group of a system.

Furthur to Superman's answer, use NetLocalGroupEnum[^] and NetLocalGroupGetMembers[^] to retrieve a list of the members of a particular local group in a local machine/system.

Mogaambo khush huvaa ? Wink | ;)

Problem in using toolbar.

Le@rner12-May-09 19:47

Le@rner

12-May-09 19:47

Hi all,

i have SDI type application,and split it in two columns.
for one column i m using a Treeview and for another one i m using a FormView.

in toolbar two buttons functions override in Treeview class because they are related to treeview here i m inserting,deleting the tree items.

when i focus on formview and than click on those toolbar buttons than they are not working ,while when i have focus on TreeView and than click on those buttons than those are working perfectly.

please tell me how can i use as general.

if possible please explain me with example.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

[Message Deleted]

lek25812-May-09 19:22

lek258

12-May-09 19:22

[Message Deleted]

Re: Creating ISO9660 Image File(URGENT PLEASE)

Michael Schubert13-May-09 0:15

Michael Schubert

13-May-09 0:15

lek258 wrote:
Creating ISO9660 Image File(URGENT PLEASE)

What variable type is "URGENT PLEASE"?

Maybe this works:

void Creating ISO9660 Image File(int URGENT PLEASE);
.
.
.
.
void Creating ISO9660 Image File(int URGENT PLEASE)
{

  return;
}

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