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The System.Windows.Forms.CheckedListbox contains the following properties that you can use to find out what nodes are selected:
.SelectedIndex
.SelectedIndices
.SelectedItem
.SelectedItems
.SelectedValue
If you want to find out which ones are checked you should use any of the following:
.CheckedIndices
.CheckedItems
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Hi right now i am using the following code, every thing is fine, but i am not getting the print content from the jobs in PrintQueue. Any one can help me or suggest me how can i read the content (print document data).
Always the "bPrintData" shows ZERO bytes length
Thanks in advance. This is very very urgent to me..
--Krishna
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Management;
using System.Net;
using System.IO;
using System.Printing;
using System.Collections;
namespace ManagingPrinterJobs
{
public partial class Form1 : Form
{
private PrintServer localPrintServer;
private PrintQueue defaultPrintQueue;
private Hashtable printJobsList1;
private Hashtable printJobsList2;
private PrintJobInfoCollection jobs;
delegate void ScheduleJobs_Delegate(object sender, System.Timers.ElapsedEventArgs e);
private System.Timers.Timer JobScheduleTimer = new System.Timers.Timer(1);
private PrintQueueStream prtQueStream;
private String sPrintJob = String.Empty;
private byte[] bPrintData;
private void Form1_Load(object sender, EventArgs e)
{
//localPrintServer = new LocalPrintServer();
PrintServer localPrintServer = new PrintServer("HP LaserJet 5000");
defaultPrintQueue = LocalPrintServer.GetDefaultPrintQueue();
printJobsList1=new Hashtable();
printJobsList2=new Hashtable();
JobScheduleTimer.Elapsed += new System.Timers.ElapsedEventHandler(ScheduleJobs);
JobScheduleTimer.Start();
jobs = defaultPrintQueue.GetPrintJobInfoCollection();
foreach (PrintSystemJobInfo job in jobs)
{ printJobsList2.Add(job.JobIdentifier, job.Name); }
}
private void ScheduleJobs(object sender, System.Timers.ElapsedEventArgs e)
{
try
{
//if (textBox1.InvokeRequired)
//{
// ScheduleJobs_Delegate Delegate = new ScheduleJobs_Delegate(ScheduleJobs);
// textBox1.Invoke(Delegate);
//}
//else
//{
defaultPrintQueue = LocalPrintServer.GetDefaultPrintQueue();
jobs = defaultPrintQueue.GetPrintJobInfoCollection();
foreach (PrintSystemJobInfo job in jobs)
{
if (!printJobsList2.Contains(job.JobIdentifier))
{
if (!printJobsList1.Contains(job.JobIdentifier))
{
job.Pause();
printJobsList1.Add(job.JobIdentifier, job.Name);
PrintQueueStream prtQueStream = new PrintQueueStream(defaultPrintQueue, job.Name, false);
bPrintData = new byte[prtQueStream.Length];
int qty = prtQueStream.Read(bPrintData, 0, Convert.ToInt32(prtQueStream.Length));
if (bPrintData.Length >= 1)
{
for (int i = 0; i <= bPrintData.Length; i++)
{
sPrintJob += Convert.ToChar(bPrintData);
}
}
job.Cancel();
}
}
}
if (sPrintJob != String.Empty)
{ MessageBox.Show(sPrintJob); }
}
}
Krishna Prasad RVS
Microsoft Certified Application Developer (MCAD)
modified on Friday, May 16, 2008 6:50 AM
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Hello everyone,
Here is my code, and it will always output UTF-16 at XML header even if I set the XML declaration to UTF-8.
Here is my code and output.
My questions,
1. How to make UTF-8 in header other than UTF-16?
2. Is the XML string really UTF-16 encoded or UTF-8 encoded? I think in C#, string is always UTF-16 encoded, why do we need a UTF-8 in header?
<?xml version="1.0" encoding="utf-16"?>
<CategoryList a="12345" b="1d5458cd-a070-40cc-a3f4-cf3c394013cc" c="true" />
using System;
using System.Text;
using System.IO;
using System.Xml;
class Test
{
public static void Main()
{
XmlDocument xmlDoc = new XmlDocument();
XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
XmlElement rootNode = xmlDoc.CreateElement("CategoryList");
xmlDoc.InsertBefore(xmlDeclaration, xmlDoc.DocumentElement);
rootNode.SetAttribute("a", "12345");
rootNode.SetAttribute("b", Guid.NewGuid().ToString());
rootNode.SetAttribute("c", "true");
xmlDoc.AppendChild(rootNode);
StringWriter stream = new StringWriter();
xmlDoc.Save(stream);
string content = stream.ToString();
Console.Write(content);
return;
}
}
thanks in advance,
George
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Looking at msdn documenation: http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.createxmldeclaration.aspx[^]
The section about encoding says,
"The value of the encoding attribute. This is the encoding that is used when you save the XmlDocument to a file or a stream; therefore, it must be set to a string supported by the Encoding class, otherwise Save fails. If this is nullNothingnullptra null reference (Nothing in Visual Basic) or String.Empty, the Save method does not write an encoding attribute on the XML declaration and therefore the default encoding, UTF-8, is used.
Note: If the XmlDocument is saved to either a TextWriter or an XmlTextWriter, this encoding value is discarded. Instead, the encoding of the TextWriter or the XmlTextWriter is used. This ensures that the XML written out can be read back using the correct encoding. "
So I would guess that the "note" applies in your case. Your StringWriter that you are saving to is causing the encoding value to be ignored. (I imagine that the underlying StringBuilder is using UTF-16 strings)
If you were to use the XmlTextWriter, then you can specify the encoding that you want.
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Great wmba!
I studied it. And I think the following statements applies to my issue, right?
--------------------
Note: If the XmlDocument is saved to either a TextWriter or an XmlTextWriter, this encoding value is discarded. Instead, the encoding of the TextWriter or the XmlTextWriter is used. This ensures that the XML written out can be read back using the correct encoding. "
--------------------
But It only mentions TextWriter and XmlTextWriter, which will be able to use their own encoding approach, but I am using StringWriter, it is not mentioned in the document, right?
regards,
George
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Thanks wmba,
1.
I have solved this issue from your help. Here is my code. Could you review whether it is correct please?
using System;
using System.Text;
using System.IO;
using System.Xml;
class FSOpenWrite
{
public static void Main()
{
StringWriter stream = new StringWriter();
XmlTextWriter writer = new XmlTextWriter(stream);
writer.WriteStartElement("Stock");
writer.WriteAttributeString("Symbol", "123");
writer.WriteElementString("Price", "456");
writer.WriteElementString("Change", "abc");
writer.WriteElementString("Volume", "edd");
writer.WriteEndElement();
string content = stream.ToString();
return;
}
}
2.
Why in my original code in question, even if I set UTF-16, but I can only use UTF-8 encoding?
regards,
George
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With your code sample, you are missing the part to tells the XmlTextWriter what encoding to use. If you use any class that is derived from a TextWriter (like StringWriter), then you can't specify the encoding. The reason for this is that the base string in a StringWriter is UTF-16, so you have no options for using a different Encoding.
If however, you use a MemoryStream, or something derived directly from Stream, then you can specify a different Encoding.
Anyway, here is a code snippet that describes this:
MemoryStream ms = new MemoryStream();
XmlTextWriter writer = new XmlTextWriter(ms, Encoding.UTF8);
writer.Formatting = Formatting.Indented;
writer.WriteStartDocument();
writer.WriteStartElement("Stock");
writer.WriteAttributeString("Symbol", "123");
writer.WriteElementString("Price", "456");
writer.WriteElementString("Change", "abc");
writer.WriteElementString("Volume", "edd");
writer.WriteEndElement();
writer.Flush();
ms.Seek(0, SeekOrigin.Begin);
StreamReader sr = new StreamReader(ms);
string content = sr.ReadToEnd();
Console.WriteLine(content);
return;
It is important to note that you could have used a similar technique in your original code when you used the XmlDocument.
The reason why you were getting the UTF-16 encoding is because your underlying writer class was a string. StringWriter writes directly to a string (or possibly a StringBuilder). And because strings in .NET are all UTF-16, that is the encoding you got.
When you write directly to a stream (FileStream, MemoryStream, etc), then you are not writing to a string, but conceptually you are writing to just an array of bytes. Because of that you can specify a different encoding.
Anyway, I hope this helps you out.
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I like your sample, wmba!
So, cool!! 
regards,
George
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George_George wrote: I am using StringWriter
That doesn't write to a file, does it?
Always use an XmlTextWriter for writing XML documents to files.
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Thanks PIEBALDconsult,
I only need a memory representation (string) for XML. No need to write to a file. My question is, why even if I set UTF-8 property, but in my original question and code, UTF-16 header is displayed?
regards,
George
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I'm guessing that it's because .net strings are two-byte Unicode, but I could easily be wrong.
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Thanks PIEBALDconsult,
I agree C# is using UTF-16 as internal encoding approach, but why the XML header UTF-8 which is already set is overwritten by UTF-16?
regards,
George
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Because doing otherwise would be wrong.
What problem are you trying to solve?
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Thanks PIEBALDconsult,
I do not quite understand why I set UTF-8 header, but UTF-16 is output in my original sample. What is the internal operations which steals and changes my original header? 
regards,
George
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The XmlDocument.Save and XmlTextWriter operation will only write well-formed XML.
It knows that the StringWriter uses UTF-16 so it sets the proper encoding.
Encoding in UTF-16, but saying it's UTF-8 would yield mal-formed XML.
If you want UTF-8, write it to a file, a StringBuilder won't do it.
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Can I set the encoding of StringWriter from UTF-16 to UTF-8?
regards,
George
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NO, goddammit! You can't! .net strings are UTF-16, and that's it, end of story!
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Thanks PIEBALDconsult,
I have solved this issue by using MemoryStream.
regards,
George
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Hey guys
im trying to write a crystal report... the problem is that the data source comes from dataGridView.DataSource...
it moans "DataTable already belongs to another DataSet"... i'm thinking i need to send it by value(create a copy that doesn't belong to anything) instead of just passing it to the constructor of the reportViewerForm which is by reference... right?
if my assumtions are correct, how do i send (DataTable)dataGridView.DataSource the reportViewerForm by value?
ive got this now
FrmReportViewer frmReportViewer = new FrmReportViewer((DataTable)dataGridView.DataSource);
thanx
Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS
you.suck = (you.passion != Programming)
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Haven't worked with CR, so I can't tell you how to fix that error - but I can tell you that you cannot pass objects by value in C#. At best, you can clone them and pass the clone.
Cheers,
Vikram.
The hands that help are holier than the lips that pray.
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I need to use SHGetFileInfo to display large icons.For small icon display it works fine. If i change the parameter to display large icon (SHGFI_LARGEICON) it does not display the file with large icon, it always displays small icon. Could you pls help me
hImgSmall = Win32.SHGetFileInfo(fName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON);
hImgLarge = Win32.SHGetFileInfo(fName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_LARGEICON]);
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Have you defined the constants correctly?
public const uint SHGFI_ICON = 0x100;
public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
public const uint SHGFI_SMALLICON = 0x1; // 'Small icon
Dave
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After a bit of 'googling' is appears that SHGetFileInfo ... _LARGEICON returns the 32x32 icon, not any greater than that.
You need to call SHGetFileInfo to get the image list index, then SHGetImageList to get the larger icons.
Some code here[^] that may be useful.
Dave
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I have a data grid that contains a checkbox in its one of the column. I have another column that needs to get populated with current date after we check the checkBox, as soon as we click on checkBox but not after we leave the CheckBox cell.Please help help me.
Thank you. 
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