C# Discussion Boards - CodeProject

Re: .net 2.0 visual style

27-Dec-06 6:57

There are several ways to get there:

*
* 1.
* call Application.EnableVisualStyles(); just before
* Application.Run(f);
* disadvantages:
* - this method does not exist under .NET 1.0
* - this method has a bug, causing later some ShowDialogs to throw a
* SEHException
* e.g. when using a ContextMenu on a NotifyIcon
*
* 2.
* create a manifest file with a specific name (<myApp>.exe.manifest) and put it
* in the directory containing the exe file itself. The fixed content must be:
*

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<description>.NET control deployment tool</description>
<dependency>
<dependentAssembly>
<assemblyIdentity
type="win32"
name="Microsoft.Windows.Common-Controls"
version="6.0.0.0"
processorArchitecture="X86"
publicKeyToken="6595b64144ccf1df"
language="*"
/>
</dependentAssembly>
</dependency>
</assembly>

*
* 3.
* create an instance of a special class before creating any of the intended
* forms, as in:
*
using (new LP_EnableTheming(true)) {
myForm form=new myForm();
form.CreateControl(); // can be included in myForm constructor !
Application.Run(form);
}
*/

The special class is inspired on the article at http://www.codeproject.com/useritems/ThemingInScope.asp
Smile | :)

Luc Pattyn

-- modified at 14:12 Wednesday 27th December, 2006

Dan Neely27-Dec-06 7:24

Dan Neely

27-Dec-06 7:24

Luc Pattyn wrote:
The above got dammaged (all less/greater than signs got interpreted; I need an
extra HTML command ?!)

You need to check "Ignore HTML tags in this message" to keep the board from eating them.

--
Rules of thumb should not be taken for the whole hand.

Re: .net 2.0 visual style

Luc Pattyn27-Dec-06 8:14

Re: .net 2.0 visual style

27-Dec-06 8:14

Thanks Dan.

Luc Pattyn

Thomas Stockwell28-Dec-06 7:28

Thomas Stockwell

28-Dec-06 7:28

The visual style for all of the .NET frameworks is what the machine is currently using. With XP for example, their are 3 visual styles: luna, metallic, and homestead. All of the .NET frameworks (as long as the code or manifest files are provided in the application) will use the visual style specified. The main differences in the UI between .NET 1.1 and .NET 2.0 would have to be the new ToolStrip, MenuStrip, and ContextStrip which are still dependent on the visual style (if render property is system defined). The strips which have replaced the menus and toolbars of .NET 1.x have a newer appearance that can only be used on systems with the .NET 2.0 framework installed. This new appearance will help in giving your application an interface similar to that of Office 2000-2003.

Regards,
Thomas Stockwell

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

Visit my homepage Oracle Studios[^]

.NET + bluetooth connection

Ashutosh.options4u27-Dec-06 0:28

Ashutosh.options4u

27-Dec-06 0:28

can anyone give me a link or source code of a simple text transfer from a pc to a phone or vica versa through a usb dongle.

Ashutosh

Re: .NET + bluetooth connection

Niiiissssshhhhhuuuuu27-Dec-06 2:40

Niiiissssshhhhhuuuuu

27-Dec-06 2:40

Hello,

http://32feet.net/[^]

Regards Rose | [Rose]

,

nishu

how to show ContextMenu on html code or tag ?

hdv21227-Dec-06 0:28

hdv212

27-Dec-06 0:28

hi i have a html table in my webpage that it's link to another page, i want when user mouse over on it,a context menu show user that select which page
want to view,but how to do ?(like menu)
thanks

mulitine in datagrid

karthikmnm26-Dec-06 23:55

karthikmnm

26-Dec-06 23:55

Hi How i get a multiline in datagrid

Karthik

how to capture logfile changes into a text box

Rafferty Uy26-Dec-06 22:58

26-Dec-06 22:58

Hello,

I am trying to capture changes in a logfile (which is outputed by an external executable) and show them on a text box. Because the logfile updates from time to time, I cannot simply do a while ((line = reader.ReadLine()) != null). Any suggestions on how I can capture the changes in the log file? The assumption is that the log file will just keep appending text and never get deleted. Capturing the output will end when the external .exe ends (finishes running).

Please help.

Thanks!
~Rafferty

Marek Grzenkowicz27-Dec-06 0:47

Marek Grzenkowicz

27-Dec-06 0:47

FileSystemWatcher may help.

Use FileSystemWatcher to watch for changes in a specified directory. You can watch for changes in files and subdirectories of the specified directory. You can create a component to watch files on a local computer, a network drive, or a remote computer.

PIEBALDconsult27-Dec-06 3:29

PIEBALDconsult

27-Dec-06 3:29

I do something like that.

I keep track of the position of the last byte I read from the file.
On each cycle I:

open the file
seek to the last position
read to the end
save the new position
close the file

(This is done by a service that cycles every ten seconds and reads the log of a third-party application.)

You could also keep the file open:

open the file
while (someTest)
{
if ( filePosition < fileLength )
{
read to end
}
else
{
sleep
}
}
close the file

Luc Pattyn27-Dec-06 7:16

27-Dec-06 7:16

Interesting idea.
But isnt there some risk that, while your code reads the new data from
the tail of the file, the original program is unable to append to it ??

Smile | :)

Luc Pattyn

Rafferty Uy27-Dec-06 15:47

27-Dec-06 15:47

Luc is right, I am getting an IOException when I open the log file using StreamReader because the external process is still appending to the log file. Any suggestions on how I can just read the file using read access which still allows other processes to write to it? I tried using FileStream but I just can't figure out how to use the Read(...) method, how do you convert byte[] to a string?

Thank you for your help,
~Rafferty

Luc Pattyn27-Dec-06 16:48

27-Dec-06 16:48

Sorry, I actually meant the other risk, where the log producer might
be hampered by the log consumer doing its thing.

The log consumer can always react on an IOException and come back
later to retry, but the log producer (over which we may not have control)
should never be hampered by the log consumer(s) and I am not sure
that is the case in the proposed setup.

Smile | :)

Luc Pattyn

Rafferty Uy27-Dec-06 18:50

27-Dec-06 18:50

oh.. yes that is the case, i do not have control on the log producer. Can you propose a solution on how i can read the log? Here is how I tried to do it but it stopped the log producer from executing (so I guess it was hampered as you just said).

<br />
using ( FileStream fileStream<br />
  = new FileStream(e.FullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite ) )<br />
{<br />
  fileStream.Seek(_logFileLastReadPosition, SeekOrigin.Begin);<br />
  TextReader reader = new StreamReader(fileStream);<br />
<br />
  string line;<br />
  while ( (line = reader.ReadLine()) != null )<br />
  {<br />
    PerformOutputAppended(this, new OutputEventArgs(line));<br />
    _logFileLastReadPosition += line.Length;<br />
  }<br />
          <br />
  reader.Close();<br />
  fileStream.Close();<br />
}<br />

the code above is executed during a FileSystemWatcher Changed event, e.FullPath contains the full path of the log file. PerformOutputAppended(...) is the method which appends the string into the UI textbox.

I'm not sure if i'm doing things correctly as I am not familiar with these kind of behavior.

Thanks for your help,
~Rafferty

Luc Pattyn28-Dec-06 5:00

28-Dec-06 5:00

Hi Rafferty,

I don't have a general solution available, so I did some experiments.

I have one process that periodically (100msec) writes a string to a file;
my writer code reopens the file for every write access
(with a single open, a reader would be unable to access the file at all):

private void output(string s) {
	try {
		StreamWriter sw=new StreamWriter(fileSpec, true); // append !
		sw.WriteLine(s);
		sw.Close();
	} catch (Exception exc) {
		timelog(exc.Message);
	}
}

I have another process that periodically (but at a lower frequency, 1sec) tries
to read one or more lines; the code is similar to yours.
(assume seek is zero and delay is false):

private void input() {
	try {
		StreamReader sr=new StreamReader(fileSpec);
		sr.BaseStream.Position=seek;
		if (delay) Thread.Sleep(1000);	// try to block producer !
		while((string s=sr.ReadLine())!=null) {
			log("line "+line+": "+s); // process the input data
			seek=sr.BaseStream.Position;
		}
		sr.Close();
	} catch (Exception exc) {
		timelog(exc.Message);
	}
}

This duo typically behaves well, I guess because the reader is simple enough
so it can do its job without a task reschedule, so the writer never is active
while the reader has file access.

But when I set delay true (reader keeping file accessed while relinquishing CPU), the writer starts to fail with "cannot access file", exactly as I was expecting.

I am still looking for a general solution; so far I would say the reader should
collect new data and avoid operations that take time or may relinquish the CPU.
But if the OS, for whatever reason, interrupts the input method and reactivates
the writer, things will go wrong there.

Smile | :)

Luc Pattyn

Rafferty Uy28-Dec-06 13:47