GetNamedSecurityInfo problem - C / C++ / MFC Discussion Boards

Roger Stoltz10-Jun-07 21:57

10-Jun-07 21:57

CPallini wrote:
Christian Graus wrote:
I don't think it is, I think it's compiler specific

AFAIK the postfix increment operator acts the following way:

use the current value of the variable in the statement and then increment it.

This is absolutely correct and of course considered C/C++ basics. Wink | ;)

I think Christian meant that the statement

a[i] = i++;

is an undefined behavior and the resulting operation is compiler specific.
It's undefined what index of a will be operated on.
If i equals 1 before the statement above, will a[1] be assigned 1 or will a[2] be assigned 1?

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: C++ gotchas

CPallini10-Jun-07 22:11

CPallini

10-Jun-07 22:11

IMHO should be always

a[1] = 1;

because a[i] = i++; is one statement.
What do you think about?
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.

Re: C++ gotchas

Roger Stoltz10-Jun-07 23:51

Roger Stoltz

10-Jun-07 23:51

CPallini wrote:
IMHO should be always
a[1] = 1;
because a[i] = i++; is one statement.
What do you think about?

Well, I can agree on that in this context.
However, this can get very complex for the compiler. i++ is a statement that is parsed by the compiler and would generate almost the same instructions if the statement isn't too complex. Consider the following "complier complex" code:

a[i] = foo( i++ );

I would be surprised if the compiler assigned the array index matching i before the incrementation. It will usually put the variable on the stack prior to the function call and then increment it using the incremented i as array index when assigning. This is also how the VC6 compiler resolves the statement.

But...
the VC6 compiler will assign 1 to a[1] with the following statements:

i = 1;
a[i] = i++;

This is a simpler statement and then the compiler gets smart, but it doesn't work the same way as in the example above, i.e. if the function call is replaced by simply incrementing the variable it won't assign the same array index. And this is for the same compiler. D'Oh! | :doh:

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: C++ gotchas

CPallini11-Jun-07 0:22

CPallini

11-Jun-07 0:22

Roger Stoltz wrote:
a[i] = foo( i++ );

Actually the VC6 compiler is honestly doing its job, because
foo( i++ ); is by itself a statement.

Anyway I agree on the overall point of view and I will never encourage somebody to write code like that.

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.

basic question

smzhaq10-Jun-07 9:42

smzhaq

10-Jun-07 9:42

I am a new learner of VC++ and usually get good support from code project.

I am facing problem with Streams. I need some kind guidance of some senior programmer.

Problem is that I receive some data in a ISpStreamFormat object. I want to read this data into byte pointers but when I call IStream->Read() functions with a non-zero argument as desired no of bytes to read, read method fails returning STG_E_INVALIDPOINTER message. Only fixing a zero "0" as the desired number of byted does not result in Failure message but it reads nothing.

So please if anybody guids me how to read binary data from ISpStreamFormat stream.

Regrads

Zia

Re: basic question

Christian Graus10-Jun-07 12:24

Christian Graus

10-Jun-07 12:24

smzhaq wrote:
ISpStreamFormat

Never heard of it. What sort of data are you reading ? Why are the standard C++ streams not sufficient to the task ?

It sounds to me like your stream does not have a proper input source.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: basic question

smzhaq10-Jun-07 22:23

smzhaq

10-Jun-07 22:23

thanx buddy

I was doing a blunder. In fact I was passing an uninitiallized pointer to the stream read function which was resulting in a bug.

Problem has been solved now. Thanx a lot

Regards

GetNamedSecurityInfo problem

KellyR10-Jun-07 9:21

KellyR

10-Jun-07 9:21

Hi, I'm using GetNamedSecurityInfo in a program I wrote to remove some registry keys from the Windows XP registry.

It seems to work on all the keys except for one. For some reason on one key it returns "The parameter is incorrect" as its error, yet I attempt to find this same key a moment later using the same path in a different function and it says that the key is valid.

Does anyone know what this "parameter is incorrect" might mean, besides it just having an invalid path name? All I'm passing it is a path, a pointer to an ACL to fill, and a pointer to a security descriptor.

Here's the code:

void RemoveAccessDenied(LPTSTR FullKey)<br />
{<br />
  PSECURITY_DESCRIPTOR pSD = NULL;<br />
  PACL pACL = NULL;<br />
<br />
 GetNamedSecurityInfo(FullKey, SE_REGISTRY_KEY, DACL_SECURITY_INFORMATION, NULL, NULL, &pACL, NULL,  &pSD);<br />
<br />
//.. blah blah etc<br />
}

Thanks!

Re: GetNamedSecurityInfo problem

KellyR10-Jun-07 18:05

KellyR

10-Jun-07 18:05

Found it; spybot was denying the registry change based on my blacklist.

Re: GetNamedSecurityInfo problem

Mark Salsbery10-Jun-07 18:13

Mark Salsbery

10-Jun-07 18:13

BAD Spybot BAD! *swat* Smile | :)

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Using Microsoft Visual C++ 2005EE Compile Error

Blekk10-Jun-07 8:20

Blekk

10-Jun-07 8:20

Hi,

I used to code in C++ but stopped for about a year, anyway I am back but have ran into a problem on my first project:

Any solution I now create doesn't work, when I try and build it it builds fine, but when I try and run it, I get the error that:

"Unable to start program "C:\\...projects\test\debug\test.exe". The system could not find the file specified"

I realise this means that it hasn't created the debug information, but it hasn't created the release information either.

Also I can Build Solution, and it says it is fine, but the Compile option is greyed-out and I don't know what to do.

Is there an option in MVC++EE when you can turn off compiling it until you do something?

Any suggestions?

Thanks,

Any reply is appreciated.

-- modified at 8:47 Monday 11th June, 2007

Re: Using Microsoft Visual C++ 2005EE

Christian Graus10-Jun-07 12:27

Christian Graus

10-Jun-07 12:27

Blekk wrote:
I realise this means that it hasn't created the debug information

No, it means it can't create the program - your compile is failing due to some other error.

Blekk wrote:
Is there an option in MVC++EE when you can turn off compiling it until you do something?

No, there shouldn't be. If it doesn't show the option, it probably doesn't think the option is valid, for some reason.

Re: Using Microsoft Visual C++ 2005EE

Blekk11-Jun-07 2:46

Blekk

11-Jun-07 2:46

Ok thanks but I even just tried compiling this in a new solution and it didn't work:

#include <iostream>

using namespace std;

int main()
{
cout<<"This should work...";

return 0;
}

Any ideas?

please show me the way to read file text quickly

Pham duc an10-Jun-07 7:09

Pham duc an

10-Jun-07 7:09

I have a application in which I have to read a text file with more than 1 hundred thousand lines. I am having trouble with reading file and replacing the text in file. I want to read file's content and display it in Rich text edit quickly, and when I replace some text by other texts, the process must do quickly. I have tried using Notepad to read and replace some text, but it takes about 10 to 15 minutes to finish the works

duc an

Re: please show me the way to read file text quickly

Matthew Faithfull10-Jun-07 8:21

Matthew Faithfull

10-Jun-07 8:21

The fastest text editor I've ever used is called Brief. You can download a trial of V4 here.

http://www.softpedia.com/get/Programming/File-Editors/Brief-text-editor.shtml[^]

The last version I used was 3 and I did search and replace in a 300MB text file on a 90Mhz Pentium OMG | :OMG:

Nothing is exactly what it seems but everything with seems can be unpicked.

output to printer

KARFER10-Jun-07 4:32

KARFER

10-Jun-07 4:32

hi all

please .. Can i print the output of program to the printer directly
please tell me

thank's all

<br />
#include <iostream.h><br />
<br />
main ()<br />
{<br />
	cout <<"Hi all .. That's Me";<br />
<br />
	return 0;<br />
}<br />
<br />

-*-*-*-*-*-*-*-*-*
To Be Or Not To Be
(KARFER)
-*-*-*-*-*-*-*-*-*

Re: output to printer

Randor 10-Jun-07 11:00

Randor

10-Jun-07 11:00

*if* your printer is connected to LPT1 you might be able to do the following:

<br />
ofstream printer;<br />
printer.open("LPT1");<br />
printer << "Hello World!" << '\n';<br />

And when your done streaming text to the printer you can try sending a control character of 0xC which was the old ASCII Form Feed[^] or (FF) character.

Best Wishes,
Randor (David Delaune)

Is CSocket a blocking socket ?

Girish60110-Jun-07 1:01

Girish601

10-Jun-07 1:01

Hello Friends,

I am been using CSocket in my application. But i want to know is CSocket a blocing socket or non-blocking socket, and what are the differences between them ?

Girish
Software Developer

Re: Is CSocket a blocking socket ?

S Douglas10-Jun-07 2:11

S Douglas

10-Jun-07 2:11

Girish601 wrote:
But i want to know is CSocket a blocing socket or non-blocking socket, and what are the differences between them ?

Hmmm MSDN->CSocket[^]

CSocket Class MSDN wrote:
A CSocket object also provides blocking, which is essential to the synchronous operation of CArchive. Blocking functions, such as Receive, Send, ReceiveFrom, SendTo, and Accept (all inherited from CAsyncSocket), do not return a WSAEWOULDBLOCK error in CSocket. Instead, these functions wait until the operation completes. Additionally, the original call will terminate with the error WSAEINTR if CancelBlockingCall is called while one of these functions is blocking.

Re: Is CSocket a blocking socket ?

Mark Salsbery10-Jun-07 6:44

Mark Salsbery

10-Jun-07 6:44

See Windows Sockets: Blocking[^]

CSocket is a high-level wrapper for a socket (SOCKET). To you, it's always blocking. Whether
the underlying SOCKET is in blocking mode or not is handled by the CSocket implementation.

For a non-blocking socket you can use the CAsyncSocket class or use Winsock APIs directly.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

"Add Event Handler" greyed out in VS2005

flippydeflippydebop9-Jun-07 22:09

flippydeflippydebop

9-Jun-07 22:09

Hey there. Can anybody tell me why, when you create a dialog app in VS2005 if you right-mouse click on the dialog in the resource editor then "Add Event Handler" menu option is greyed out? I want to be able to add OnInitDialog and OnPaint handlers to this dialog but cant!

If i drop a button control on the dialog through, and right click on that, then that works!!

thanks in advance.

Re: "Add Event Handler" greyed out in VS2005

#realJSOP10-Jun-07 0:59

#realJSOP

10-Jun-07 0:59

To add non-control message handlers, you have to go to the source file, and place the cursor on the closing message map macro, and then go to the properties pane. At that point you hould be able to add the handler for that message.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Re: "Add Event Handler" greyed out in VS2005

S Douglas10-Jun-07 2:16

S Douglas

10-Jun-07 2:16

John Simmons / outlaw programmer wrote:
To add non-control message handlers, you have to go to the source file, and place the cursor on the closing message map macro, and then go to the properties pane. At that point you hould be able to add the handler for that message.

[sarcasm] Clearly that's so much easier than VS6[/sarcasm]

Thanks for the tip, not that I will remember it, just seams easier to write it out.

Re: "Add Event Handler" greyed out in VS2005

#realJSOP11-Jun-07 2:42

#realJSOP

11-Jun-07 2:42

Yeah...

This goes a long way to reinforce Microsoft's claim that they are eager to support their C++ developers. The 2005 IDE sucks if you're a MFC programmer. I seriously doubt that ORCAS would add any usability for us...

Re: "Add Event Handler" greyed out in VS2005

flippydeflippydebop10-Jun-07 2:34

flippydeflippydebop

10-Jun-07 2:34

Hey John! No way, i would have never have found that out.. Thanks a million.. Smile | :)

It all becomes clear (as mud!)

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