Re: Attempted to read and write protected memory… ActiveX on Vista - C# Discussion Boards

Re: Attempted to read and write protected memory… ActiveX on Vista

4-Mar-08 19:59

Ok nothing is 'wrong' with Vista but apparently my program that have worked on XP for years does not do that on Vista. Maybe it’s a ‘new feature’ that it does not can use old ActiveX.
By the way, I have one Vista computer that my program works on but the other five cups that I have tried it on does not work.
I don’t really know where I should start searching for help…

I have the same question on http://www.codeguru.com/forum/showthread.php?p=1692586#post1692586

_____________________________

...and justice for all

APe

anderslundsgard4-Mar-08 20:10

Re: Attempted to read and write protected memory… ActiveX on Vista

4-Mar-08 20:10

Pete O'Hanlon wrote:
Vista's a lot stricter than earlier MS OSes

Can I in some way make Vista less stricter on my application?

_____________________________

...and justice for all

APe

Pete O'Hanlon4-Mar-08 23:13

Pete O'Hanlon

4-Mar-08 23:13

Have you tried to set Vista to run this program as if it were an earlier version of the OS?

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: Attempted to read and write protected memory… ActiveX on Vista

anderslundsgard5-Mar-08 0:41

Re: Attempted to read and write protected memory… ActiveX on Vista

5-Mar-08 0:41

Yes, I have tried Run this program as: Windows XP (Service Pack 2) and as administrator, but same result.

_____________________________

...and justice for all

APe

mav.northwind5-Mar-08 3:21

mav.northwind

5-Mar-08 3:21

Have you tried turning off UAC? Perhaps the ActiveX has a problem when virtualization is active...

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Attempted to read and write protected memory… ActiveX on Vista

anderslundsgard5-Mar-08 4:11

Re: Attempted to read and write protected memory… ActiveX on Vista

5-Mar-08 4:11

Now I've tried that but no difference Frown | :-(

_____________________________

...and justice for all

APe

Devil's Priest3-Jun-09 0:33

Devil's Priest

3-Jun-09 0:33

try to disable DEP

XML Element close tag appearing on new line

Chazzysb4-Mar-08 4:12

Chazzysb

4-Mar-08 4:12

Hi,

c#, vs2005.
Im creating xml documents and later validating them using an xsd.

I use the following code to create and append elements then output the xml document to a file:

XmlElement element = xmlDoc.CreateElement(fieldName);
element.InnerText = fieldValue;
parentElemennt.AppendChild(element);

the document is saved to file using xmlDoc.Save(path...)
and validated later using an XmlReader with reader settings.

The problem is that sometimes the fieldValue can be a blank string - looking at the xml file the empty tags get written as:
<element>
</element>
This causes problems with validation where lets say the type is set to a maxLength of 2:
The value '
' is invalid according to its datatype. The actual length is greater than the MaxLength value.

<element></element> works fine if i change it in the xml document manually.

How can I get the xml to be written as <element></element> or <element /> without the carriage return?

Another validation error im getting is where the field type is an Integer but left blank.
The value '
' is invalid according to its datatype The string ' ' is not a valid Integer value.
With this i still get an error if I change the xml to <element></element> and I have added the nillable=true flag in the xsd.

How can I get blank numeric elements to get accepted?

Thanks in advance.
Chas

Re: XML Element close tag appearing on new line

Pete O'Hanlon4-Mar-08 4:41

Pete O'Hanlon

4-Mar-08 4:41

Check to see if there is actually anything in fieldValue (i.e. is it an empty string) before setting the innerText. Make sure the string has been trimmed before the test so that you don't get dodgy data issues creeping in.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Help in selecting attributes with XPath [modified]

student_rhr4-Mar-08 4:02

student_rhr

4-Mar-08 4:02

<field name="textBox" y="3.175" x="3.17" w="62" h="9">
  <ui>
    <textBox>
      <border>
        <css style="">            </css>
      </border>
      <margin/>
    </textBox>
  </ui>
  <font face="Arial"/>
  <margin topInset="1" bottomInset="1" leftInset="1" rightInset="1"/>
  <textAlign vAlign="middle"/>
  <label reserve="25">
    <Font fontFace="Arial" size="8pt" />
    <textAlign vAlign="middle"/>
    <value>
      <text>textbox label</text>
    </value>
  </label>
</field>

So I am trying to read the values of Font (IF there is a textBox element present) and trying to read the attributes fontFace and size, here is my Xpath:

            XPathNodeIterator iterator = nav.Select(@"/field");
            try
            {
                while (iterator.MoveNext())
                {
                    //Do some other stuff
                    ...
                    XPathNavigator nav2 = iterator.Current.Clone();
                    if (string.Compare(nav2.Name, "field") == 0)
                    {
                    XPathNodeIterator textBoxIterator = nav2.Select("child::*/child::textBox");

                    if (textBoxIterator.Count > 0)
                    {
                        XPathExpression exp = nav2.Compile("child::Font");
                        XPathNodeIterator it = nav2.Select(exp);

                        while (it.MoveNext())
                        {
                            XPathNavigator nav3 = it.Current.Clone();
                            string fontFace = nav3.GetAttribute("typeface", nav3.NamespaceURI);
                            string fontSize = nav3.GetAttribute("size", nav3.NamespaceURI);
                        }
                    }
                }
             }
             catch
...
}

Am I doing it the proper way or is it too complicated and can be simplified?

modified on Tuesday, March 4, 2008 10:22 AM

Re: Help in selecting attributes with XPath

Christian Graus4-Mar-08 9:22

Christian Graus

4-Mar-08 9:22

//field/font@fontFace I believe, and you can put something in [] to specific a condition, such as where there's a sibling node called textbox.

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Access audio files from resources

JustRonald4-Mar-08 4:00

JustRonald

4-Mar-08 4:00

Hi,

I have a problem with retrieving a wav file from the Resources folder.
The wav is file has it build action stands on Embedded Resource.
I thought to acces a png file I can use:
Bitmap bm = new Bitmap(GetType().Assembly.GetManifestResourceStream("image.png"));

So what to use to access a .wav file?
Stream wav = System.Reflection.Assembly.GetManifestResourceStream("attention.wav");?

Thanks

Re: Access audio files from resources

Eslam Afifi4-Mar-08 4:26

Eslam Afifi

4-Mar-08 4:26

System.IO.Stream s = Properties.Resources.attention; // the name of the resource

Eslam Afifi

Re: Access audio files from resources [modified]

DaveyM694-Mar-08 4:53

Serial port communication

4-Mar-08 4:53

Stream wav = Assembly.GetExecutingAssembly().<br />
  GetManifestResourceStream(<br />
  MethodBase.GetCurrentMethod().<br />
  DeclaringType.Namespace + ".Resources." + "attention.wav");

(MethodBase.GetCurrentMethod().DeclaringType.Namespace assuming your calling from within the same namespace)

Answered this for you in this thread[^]

Dave

modified on Wednesday, March 5, 2008 4:22 AM

t_nedelchev4-Mar-08 3:59

4-Mar-08 3:59

Hello everybody
My project is a C# project on VS2005.
My application communicate with external device through Serial Port.I'm using USB to RS convertor whitch add another COM Port in my computer.When I connect with device through this COM Port(transmit and receive data) everythink is OK.When unplug the USB cable from PC and I try to transmit data the program is generate exeption.How can I detect when the COM Port is disappear?
Thanks in advance

Matthew Butler4-Mar-08 4:46

Matthew Butler

4-Mar-08 4:46

Hi,

I beleive you are looking for .IsOpen

I've just tried this with a USB-Serial converter and it works. (Goes false on a disconnect).

It doesn't cause an event though.

Matthew Butler

t_nedelchev4-Mar-08 20:45

4-Mar-08 20:45

Sorry but it doesn't works.
My code is

if (sp.IsOpen)
{
sp.Write(TxBuf, 0, (k + 2 + ofs));
}
else
{
FL_Connected = false;
MessageBox.Show("Message");
}
When I unplug USB cable (Converter) from my computer the COM Port is still yet open but when the program try to write data to serial port it's generate exception "Access to the Port is denied"

DaveyM694-Mar-08 22:19

4-Mar-08 22:19

You should always put communication like this in a try/catch block so you can catch exceptions like this.

It may be worth starting a timer when you open your port, pausing it when you're about to read/write and stopping it when you close it. That way you can test the port on each Tick event so you always know when it's connected/disconnected.

You can also monitor USB devices, get notified when one is inserted/removed and check if it's the one you're intersted in so you can act accordingly. There are some articles on this site if you search.

Dave

t_nedelchev4-Mar-08 22:59

4-Mar-08 22:59

thanks for an answer
I try to do this
try
{
sp.Write(TxBuf, 0, (k + 2 + ofs));
}
catch
{
FL_Connected = false;
MessageBox.Show("Message");
}
And it works.But when I close the program it generate the same exception(Access to the port is denied)

DaveyM694-Mar-08 23:53

4-Mar-08 23:53

Are you closing the port when you're finished with it? It sounds like you're keeping it open and the program is trying to close the port when it ends - which will generate an exception if it's not available. If you need to keep the port open for the duration, you should close the port manually in the formclosing event - and again, put that inside a try/catch block.

Dave

t_nedelchev5-Mar-08 0:05

5-Mar-08 0:05

Thanks DaveyM69
I try to do this

protected override void OnClosing(CancelEventArgs e)
{
try
{
sp.Close();
}
catch
{
int probe = 33;
}
}
In this case there is no exception when close the program but the program is stoped on the breakpoint in the catch.
There is something interesting.When I start the program again the all window is white for a 2 or 3 seconds and then starts normaly.

DaveyM695-Mar-08 0:51

5-Mar-08 0:51

Hmm... Looks like it's taking a while for it to Dispose. You could try calling Dispose() or Dispose(true) and maybe even do a GC.Collect() to force the clean up.

First thing I'd do is see what exceptions if any are occurring

catch(System.Exception ex)
{
   System.Windows.Forms.MessageBox.Show(ex.InnerException.Message);
}

Dave

t_nedelchev5-Mar-08 1:16

5-Mar-08 1:16

The problem is when I unplug the USB converter from PC and COM Port is disapear any tring of using a method of instance of serial port generate exception i.e. I can't use Sp.Dispose() or SP.Close();

DaveyM695-Mar-08 1:25