C# Discussion Boards - CodeProject

vipulpopli25-Mar-09 4:04

25-Mar-09 4:04

hi,
i am looking for code for a localization control(component in form of dll) which reads and displays the local settings of the machine.

Retrieving data from VARBINARY (ADO.net)

Jacob Dixon25-Mar-09 4:03

Jacob Dixon

25-Mar-09 4:03

I have a couple of questions first. Is it better to use VARBINARY or text when saving and getting files from a database? This is the code I have, and it works fine, but remotely it is slow and I think this is why:

int bytesSize = 0;
byte[] downBuffer = new byte[255];

byte[] buffer = (byte[])cmd.ExecuteScalar();
conn.Close();
                    
MemoryStream ms = new MemoryStream(buffer);
FileStream fs = new FileStream(Path, FileMode.Create, FileAccess.ReadWrite);

while ((bytesSize = ms.Read(downBuffer, 0, downBuffer.Length)) > 0)
{
  fs.Write(downBuffer, 0, bytesSize);
  WriteTextBox((fs.Length / 1024) + "KB of " + (ms.Length / 1024) + "KB.");
  bw.ReportProgress(Convert.ToInt32((fs.Length * 100) / ms.Length));
}

Now remotely this is where it pauses:

byte[] buffer = (byte[])cmd.ExecuteScalar();

Is this because technically that right there is downloading the file? Is there a way to actually download the file byte by byte so remotely it doesn't pause right there and this can continue to report progress (Backgroundworker)? It also times out remotely as well because its taking too long to execute that statement

Re: Retrieving data from VARBINARY (ADO.net)

PIEBALDconsult25-Mar-09 5:10

PIEBALDconsult

25-Mar-09 5:10

Pauses? How long?

What's in the field? How big is it?

I've stored files in a database and not had any problems (I have forgotten what type of field I used, possibly image).

And when I wrote one back out I used:

filestream.Write
(
    bytearray
,
    0
,
    bytearray.Length
) ;

It all seemed quick enough, even for several megabytes.

Re: Retrieving data from VARBINARY (ADO.net)

Jacob Dixon25-Mar-09 5:13

Jacob Dixon

25-Mar-09 5:13

The file that I tested it on was 16MB. Now I was VPN so it was going through that. I set the timeout for 60 seconds, so it was taking longer than 60 seconds for that command.

save a jpg as 8 bit grayscal

cmarmr25-Mar-09 3:17

cmarmr

25-Mar-09 3:17

here is a code snip i am using but when i save a jpg with this code it is 24 bit grayscale

saveJpeg(file1,img,8);

private void saveJpeg(string path, Bitmap img, long quality)
{
// Encoder parameter for image quality
EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

// Jpeg image codec
ImageCodecInfo jpegCodec = this.getEncoderInfo("image/jpeg");

if (jpegCodec == null)
return;

EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = qualityParam;

img.Save(path, jpegCodec, encoderParams);
}

private ImageCodecInfo getEncoderInfo(string mimeType)
{
// Get image codecs for all image formats
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

// Find the correct image codec
for (int i = 0; i < codecs.Length; i++)
if (codecs[i].MimeType == mimeType)
return codecs[i];
return null;
}

Thanks,
Chad Aiena

Re: save a jpg as 8 bit grayscal

Deresen25-Mar-09 3:43

Deresen

25-Mar-09 3:43

Lol I think this piece of code is funny:

// Find the correct image codec
for (int i = 0; i < codecs.Length; i++)
  if (codecs[i].MimeType == mimeType)
    return codecs[i];
  return null;
}

You can better rewrite it like this:

if(codecs.Length >= 1)
{
  if(codecs[0].MimeType == mimeType)
    return codecs[0];
  return null;
}

But what is your question exactly?

mon***z25-Mar-09 2:50

mon***z

25-Mar-09 2:50

I had one application in c# asp.net 1.1.There form id is come in html page.Now i converted to 2.0 and put it into master page ange inheriting another page which has contain place holder.how i will use tha form id there . because in 1.1 the form id is used in a java function. in 2.0 in the function it is there the form id name is there but in codebehind form id is not declared. how to use form id in 2.0

Re: hi

Xmen Real 25-Mar-09 3:10

Xmen Real

25-Mar-09 3:10

this[^] may help

BTW when you post message nextime, use these subjects
hi, I'm sachin tendulkar
how are you ?
show me what you've got ?

or any appropriate subject belongs to your question or problem

TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>

-----------------------------------------------
128 bit encrypted signature, crack if you can

Re: hi

Deresen25-Mar-09 3:11

Deresen

25-Mar-09 3:11

First of all, this is the C# forum, for ASP.NET questions, we have an ASP.NET forum, try your question there.
Second: if you have a question, you should use the question mark to show which sentence is your question. That would be a lot easier.

How can I make browser not to display its page content for 1 or 2 sec using c#?

svt gdwl25-Mar-09 2:49

svt gdwl

25-Mar-09 2:49

Hi
I had a BHO through which I had to convert the web page content from English to other language (say Hindi). I am able to retrieve the web page content and replace it with other language text, but the problem is the original text visible to user for a fraction of second (which is < 1sec), I want the converted page should be directly visible to user. For this what can I do?

I had trying for this since longtime?
If there are any advises, please post it here, thanks...

Handling File Events in C#

agent00zelda25-Mar-09 2:48

agent00zelda

25-Mar-09 2:48

Hello. I am new to C# (used Java originally), and I was wondering what would be the best way to handle file events in a console application. Specifically, I need to monitor a bunch of directories to see if new files are being added, and then do something with them if so. I guess I'm confused because I need to thread the watchers, but am unsure how/where to handle their corresponding events. I have been looking around for resources but am coming up on threading samples and event samples but not any combination of the two and so I don't know exactly where to start. If anybody has a suggestion or resource, I would greatly appreciate it!!

Re: Handling File Events in C#

Thomas Krojer25-Mar-09 2:55

Thomas Krojer

25-Mar-09 2:55

start by reading about "System.IO.FileSystemWatcher".

Re: Handling File Events in C#

agent00zelda25-Mar-09 4:16

agent00zelda

25-Mar-09 4:16

Thank you, that helped clarify some of the event concepts for me.

I guess I'm wondering now whether the filesystemwatcher acts as a thread... meaning does it listen indefinitely while the main program works until it hears something? Or does it have to be wrapped in a thread to do so?

Re: Handling File Events in C# [modified]

Ian Shlasko25-Mar-09 4:55

Ian Shlasko

25-Mar-09 4:55

I believe it works on its own thread, then invokes the events to the UI thread. If your GUI is going to stay responsive, you don't have to worry about threading at all. Just create it, set the needed properties (Path, NotifyFilter, Filter), turn on EnableRaisingEvents, hook the events you want, and handle them as needed. If I remember right, this is a port from the old VBScript library, so it's intended to be as easy to use as possible.

To make sure it works that way, you might want to just be sure that you're CREATING it on the UI thread. If you don't, it might invoke events to a different thread unless you set the SynchronizingObject property to a GUI control. You can also use that same property to invoke the events onto a thread of your choosing.

If you want finer control, you can skip the events entirely, create it on a dedicated background thread, and loop on the WaitForChanged method, which will block until it receives a notification. Most of the time, this is overkill.

There's more detail on each of those properties and methods in the MSDN help.

EDIT: Sorry, missed where you said it was a console application. In that case, you probably want to go with the last method I mentioned, looping on WaitForChanged to do everything synchronously.

modified on Wednesday, March 25, 2009 11:10 AM

changing the database location

Mubeen.asim25-Mar-09 1:53

Mubeen.asim

25-Mar-09 1:53

hello.. i have an msaccess database in my c# project given the path as c:\my proj\db.mdb
and in my second project i reffered to the same database and when i change the db.mdb from its original location the visutal studio cant find the db and giving an error.... is if possible to change the path of the database after adding to the project...thanks...

Re: changing the database location

Ashfield25-Mar-09 2:11

Ashfield

25-Mar-09 2:11

Thats what app.config is for.

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Re: changing the database location

Mubeen.asim25-Mar-09 5:04

Mubeen.asim

25-Mar-09 5:04

thanks... that was xtremly helpful...

Re: changing the database location

Ashfield25-Mar-09 5:49

Ashfield

25-Mar-09 5:49

Do I detect a hint of sarcasm here?

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Re: changing the database location

Mubeen.asim25-Mar-09 6:49

Mubeen.asim

25-Mar-09 6:49

sorry if u have fealt like that but ur answer solved my problem.. cause i had googled it with long strings but colud not find any relavant answers....

Re: changing the database location

Ashfield25-Mar-09 9:09

Ashfield

25-Mar-09 9:09

No offence intended, its just that often if you just give someone a hint they can't be bothered to follow it up, they expect complete code samples. I'm pleased it helped, I generally only give an idea of the answer, as by finding out for yourself you learn. Obviously in your case it applied Smile | :)

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

C# library for visual network layout / flow chart needed

midix25-Mar-09 1:27

midix

25-Mar-09 1:27

Hi all!

I have a small project where I need to create a visual family tree editor. Before I start reinventing the wheel, I would like to know if there are any free or open source C# library which lets me do the following:

-add, select and remove elements (simple boxes with title is enough) with mouse and context menu
-connect and disconnect elements with mouse.

If I have this, I 'll be able to do the rest myself (attaching some data structure to the visual tree and storing the tree to a database).

Thanks for any ideas.

Re: C# library for visual network layout / flow chart needed

Xmen Real 25-Mar-09 2:35

Xmen Real

25-Mar-09 2:35

here[^] is one but in C++ Sniff | :^)

-----------------------------------------------
128 bit encrypted signature, crack if you can

Re: C# library for visual network layout / flow chart needed

midix25-Mar-09 3:45

midix

25-Mar-09 3:45

Oh, that is great, if only it was C#. Anyway, thanks, I'll see if I can port it to C#.

adapting a webcam driver to an existing form

VitroBlue25-Mar-09 1:26

VitroBlue

25-Mar-09 1:26

hi
i'm new at c# and i'm using visual studio c# 2008
i have a very large application which needs to take pictures from a webcam to work with them
i found this code (among many other which i haven't been able to get to work) http://www.c-sharpcorner.com/UploadFile/yougerthen/810262008070218AM/8.aspx[^]

notice there, in the extra code the author asks to add for the thing to work, it has already a initializeComponent() since its a form of sorts. BUT notice too that MY application is also a form and pretty much larger, so of course it has its own initializeComponent() with near 150 other componets; the webcam stuff must be in one of the tabs initialized there.

If i let the initializeComponent() be, the compiler says it does not exist in the actual context. i deleted the constructor altogether but then obviously not even the pictureBox appears. but then if i leave the constructor there, but remove the initializeComponent()... what should it had inside instead? the picture box and buttons are already taken care of in the bigger initializeComponent().

so how can i merge this code into mine so i can use the webcam features in there?
any ideas?

Re: adapting a webcam driver to an existing form [modified]

erfi25-Mar-09 3:10

erfi

25-Mar-09 3:10

i can't download the code from your link. it has a problem. but here is some links which can help you:
http://www.codeproject.com/KB/directx/PrgmngDirectShowappsCS.aspx[^]

http://www.codeproject.com/KB/directx/directshownet.aspx[^]

and the best resource for you is here :
http://sourceforge.net/project/showfiles.php?group_id=136334[^]

if you want to import codes from other projects to your project you shouldn't use their InitializeComponent() function. just add the necessary initialization codes after your InitializeComponent() function. like this :

public Form1()
{
    InitializeComponent();
    // add initialization codes here
    // ...
}

sometimes 0 can be 1

modified on Wednesday, March 25, 2009 9:26 AM

Last Visit: 31-Dec-99 18:00 Last Update: 7-May-24 15:36

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