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A "buffer" is a block of memory that holds data. The text buffer (a char[] array, actually) will be even larger if you insert return codes because you'll be including 1-2 extract characters every so often. How the buffer is displayed is a user interface.
If you want to insert a return code you must use the correct return code for the underlying platform. The Environment.NewLine property abstracts this detail away from you, since - on Windows - the actual new line constant is "\r\n". For console output you can use simply "\n" which gets translated appropriately, but for most text you should use Environment.NewLine. For example:
string value = string.Format("This is a{0}broken line.{0}This is a separate line.", Environment.NewLine);
label1.Text = value;
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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thanks for the help. I was wandering though,is there a way to actually reveal formatting. like, insert text into one richTextBox and then ouput the text with the formatting symbols ("\r\n"), or the thing you showed me in a second richTextBox? This would be very very helpful to me. thanks again.
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ok I think I figured it out. one thing though, how do I insert the text "\r\n" as text, without using it as actual formatting.
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You can escape them like "\\r\\n" or use the verbatim modifier @"\r\n".
Regards
Senthil
My Blog
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I am writing a prog that will process data every 15 mins to 1 hour.
I have looked at System.Timer and Window Timer but they seem to be conern about millisecond timing and I presume that the amount of resources (processer and RAM) that it requires might be wasted since I only require accuracy of a minute.
I was wondering if you guys actually use Timers with elapse time of 15 mins - an hour or is there a better solution for this.
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A timer uses very little resources because it works with your system clock which is essential to making your computer work. Your CPU and system clock work together. Any computer engineering book you could pick up will help you understand this better.
Note that there are actually 3 timers in the .NET BCLSystem.Threading.TimersSystem.Timers.Timer- System.Windows.Forms.Timer
Each have a resolution of 1 millisecond but work different ways, like requiring a callback or exposing an event (to which you add a handler, or callback).
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Hi,
I have a tabcontrol with 4 tabpages.
Each tabpage contains a richtextbox.
I do not have anyproblem running my application and viewing all the tabs when the system font is set to small font. When the font is set to large font, all the tab pages become gray and the richtextboxes are not shown at all!
Does anyone know of a solution to this problem?
(setting the AutoSize property of the RichTextBoxes to true does not help )
Thanks.
avivhal
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How exactly do you mean? The system fonts are set to large while your application is running and the TabControl shown, or even when the fonts are set to large before your application is running? The latter should not cause problems, but the former situation can. Handling the SystemEvents.UserPreferenceChanged event may help so that you can react accordingly, often times call Control.Update on controls that having trouble updating their drawing surface themselves.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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The system font is set to large before the application is running. This causes the tabs not to appear. If the font is set to small the problem is gone and all tabs are shown.
I have actually only seen this behavior on windows 2000 systems. On XP the problem does not exist. Does this make any difference?
Could it be a .NET CLR issue?
Thanks.
avivhal
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No, it would not be a CLR issue. For one, the CLR is the same - for the most part - for all supported platforms. There are small differences, like that the CLR on 9x will thunk Unicode text, but understand that most of the Windows Forms controls are just encapsulating the Windows Common Controls. They are not - except for a few like DataGrid and many of the upcoming new controls in .NET 2.0 - implemented "natively" (i.e., not as pure .NET classes). This is to provide a consistent UI with the rest of Windows.
It could be a problem with the underlying Tab-Control common control. Reproduce the steps using a native application that uses the Tab-Control and see if you see the same problem. Also make sure your system is up-to-date by visiting Windows Update.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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I got a programs like below, and I dunno how to make it user input. The data that I need user to input are :ratio, maxqsize,pgr,packetSize, and bandwidth.
I'm trying with the
ratio=double.Parse(tbSRuns.Text);
maxqsize=in.Parse(tbmaxqsize.Test);...........
and try to implement witn error exception but it seems not work.
pls help me very urgent (
the code is here: just can download
http://s22.yousendit.com/d.aspx?id=086RE5J2BGVV40YK3Z3VQ4QZ7Y
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Hi tyenchoo,
What error are you getting? Dobule.Parse, Int32.Parse() methods convert string to corresponding type. Can you lets us know the error.
Regards
SGS
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i have use this method to pass date, but i found that i cannot pass the value between class, izzit use pass by data or pass by reference? can giv example?
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I am just working with PictureBox and I have to draw rectangle over picture. I take Graphics object and use DrawRectangle. Then, I have to move or resize this rectangle, so first I need to restore previous image. I do it with
Graphics.DrawImage(SourceImage, Rect, Rect, …), but I think it not the fastest way.
...
grPicBox.DrawImage(PicBox.Image, LastRect, LastRect, GraphicsUnit.Pixel);
grPicBox.DrawRectangle(RedPen, CropRectangle);
…
I’m searching for better idea.
Thanks!
-------------
Lukasz Szymik
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From where is this code called? You might consider not even redrawing the image synchronously, but enabling double buffering and calling Control.Update when moving the rectangle. This will cause the control to redraw the image in a background thread and flip the buffer to the control's surface when resources are available. See the documentation[^] for the ControlStyles enumeration, which you pass to Control.SetStyle.
Also note that you should do as much drawing as possible in an override to OnPaint (do not handle events when extending controls, which is a more robust solution than handling events on an external class), being sure to call base.OnPaint when appropriate. In that case, use PaintEventArgs.Graphics that is passed to you and do not dispose it yourself, like you normally would if you use Control.CreateGraphics. The latter call can be expensive, too, so depending on how your code above is used - which is why I asked - could also be the source of poor performance if you're creating a new Graphics for each call to OnMouseMove.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Thank You very much, double buffering is perfect for my application
-------------
Lukasz Szymik
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Hi folks!
In another forum someone was asking how to serialize a class like this using XmlSerializer:
class Test
{
public Test() {}
private int someval;
public int SomeVal
{
get { return someval; }
set { someval = value; }
}
private object tag;
public object Tag
{
get { return tag; }
set { tag = value; }
}
}
Whether XmlSerializer is able to serialize an instance of this class or not is depending on the value of Tag, strangely enough.
When Tag is an int or string for example, everything works fine.
When Tag is an int[], for example, you get an exception during serialization.
That's the first thing I can't understand. Having an int[] property in the class serializes just fine.
At first I thought the XmlSerializer is having problems when it doesn't know the type to serialize beforehand, but then I changed the definition of the class a bit and suddenly it worked:
Only by adding this property:
private int[] dummy;
public int[] Dummy
{
get { return dummy; }
set { dummy = value; }
}I could get the XmlSerializer to not throw an exception when serializing the class with an int[] assigned to the Tag property! 
Can anyone imagine what's going on there?
Thanks in advance,
mav
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The type has to be serializable. Read the documentation[^] for the SerializableAttribute class, as well as Serializing Objects[^] in the .NET Framework SDK.
Also note that the SerializableAttribute is not, by default, inheritted like some other attributes.
If you assigned a Control or Control-derivative to the Tag property, for example, it would not serialize despite the fact that its indirect base class MarshalByRefObject is marked as serializable because the SerializableAttribute is not inheritted. In your case with intrinsics and arrays, they are serializable. The class declaration (keeping in mind than any array you declare extends System.Array) in the .NET Framework SDK which tell you which classes are marked as serializable.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Thanks for your reply, Heath!
I had flagged the class as [Serializable], of course, but didn't write it in the sample code, sorry.
What you describe is more or less what I thought about serialization so far.
But this doesn't explain the behaviour I get (or perhaps I'm just too dense to see it):
Class without the Dummy property and an int assigned to Tag serializes OK.
Class without the Dummy property and an int[] assigned to Tag throws exception.
Class with the Dummy property and an int assigned to Tag serializes OK.
Class with the Dummy property and an int[] assigned to Tag serializes OK.
I'd assume that Tag wouldn't get serialized at all, because object isn't serializable by default.
But obviously XmlSerializer does serialize the Tag property.
And whether this serialization succeeds or fails is depending on other attributes/properties of the same class. That's what strikes me odd...
Still puzzled,
mav
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Assume that I have a treeview with few node, I would like to select the node, press F2 or right click on that node, choose "Rename", and a textbox will appear to let me change the text of that node (include validtion if needed, number only for example), end accept changes when I press enter...
Show me the Idea for this problem
Thankx!
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Here is the idea for "How to rename a tree node on key press (F2) and via a right-click menu":
Controls added: button1, treeView1, contextMenu1, menuItem1...
- Use the button to add nodes to the tree
- Add the corresponding events for the following..
<br />
private void RenameNode()<br />
{<br />
if (this.treeView1.SelectedNode != null)<br />
{<br />
this.treeView1.LabelEdit = true;<br />
this.treeView1.SelectedNode.BeginEdit();<br />
}<br />
}<br />
<br />
private void treeView1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)<br />
{<br />
if (e.KeyCode == Keys.F2){RenameNode();}<br />
}<br />
<br />
private void menuItem1_Click(object sender, System.EventArgs e)<br />
{<br />
RenameNode();<br />
}<br />
<br />
private void treeView1_AfterLabelEdit(object sender, System.Windows.Forms.NodeLabelEditEventArgs e)<br />
{<br />
this.treeView1.LabelEdit = false;<br />
}<br />
<br />
private void treeView1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)<br />
{<br />
this.menuItem1.Enabled = (this.treeView1.SelectedNode != null);<br />
}<br />
<br />
private void button1_Click(object sender, System.EventArgs e)<br />
{<br />
this.treeView1.Nodes.Add(new TreeNode("text here..."));<br />
}<br />
Hope this helps. Cheers
Radgar
"Imagination is more important than knowledge." - Albert Einstein
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And you have the AfterLabelEdit[^] event fired by the TreeView control where you can validate the new text, and cancel it if necessary.
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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Nice input Luis.
Radgar
"Imagination is more important than knowledge." - Albert Einstein
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Hi,
I'm trying to use the Microsoft.Web.Services2.Messaging.
ISoapFormatter
but I receive this error:
System.Xml.XmlException: Reference to undeclared parameter entity, 'meetingmaker'.
at System.Xml.XmlLoader.ExpandEntityReference(XmlEntityReference eref)
at System.Xml.XmlEntityReference.SetParent(XmlNode node)
at System.Xml.XmlNode.AppendChild(XmlNode newChild)
at System.Xml.XmlLoader.LoadAttributeChildren(XmlNode parent)
at System.Xml.XmlLoader.LoadAttributeNode()
at System.Xml.XmlLoader.LoadCurrentNode()
at System.Xml.XmlLoader.LoadElementNode()
at System.Xml.XmlLoader.LoadCurrentNode()
at System.Xml.XmlLoader.LoadChildren(XmlNode parent)
at System.Xml.XmlLoader.LoadElementNode()
at System.Xml.XmlLoader.LoadCurrentNode()
at System.Xml.XmlLoader.LoadChildren(XmlNode parent)
at System.Xml.XmlLoader.LoadElementNode()
at System.Xml.XmlLoader.LoadCurrentNode()
at System.Xml.XmlLoader.LoadChildren(XmlNode parent)
at System.Xml.XmlLoader.LoadElementNode()
at System.Xml.XmlLoader.LoadCurrentNode()
at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)
at Microsoft.Web.Services2.SoapEnvelope.Load(Stream stream)
at Microsoft.Web.Services2.Messaging.SoapPlainFormatter.Microsoft.Web.Services2.Messaging.ISoapFormatter.Deserialize(Stream stream)
at WebSemantica.SoapSmtp.Mailbox.EndReceive(IAsyncResult result) in c:\wsf-projeto+final-julio\wsf-projeto final\websemantica\zutil-soapsmtp\mailbox.cs:line 308
----------------------------------------------------------
the code I'm using is (line 308 is the last line):
UTF8Encoding encoding = new UTF8Encoding();
SimpleMailMessage m = messagesArray[i];
ISoapFormatter formatter = new SoapPlainFormatter();
MemoryStream stream = new MemoryStream( encoding.GetBytes( m.TextDataString
) );
stream.Position = 0;
envelopes[i] = formatter.Deserialize( stream );
----------------------------------------------------------
if I print the xml (the "m.TextDataString") the result is:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE rdf:RDF [
<!ENTITY meetingmaker "http://websemantica.puc-rio.br/2004/06/meetingmaker/meetingmaker#">
<!ENTITY ical "http://www.w3.org/2002/12/cal/ical#">
<!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#">
<!ENTITY xsd "http://www.w3.org/2001/XMLSchema#">
]>
<soap:Envelope xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/03/addressing" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Header><wsa:Action>InvokeCoordinator</wsa:Action><wsa:MessageID>uuid:d905eba6-7ed8-420d-a297-b8625751f63c</wsa:MessageID><wsa:To>urn:websemanticaproxy</wsa:To><wsse:Security><wsu:Timestamp wsu:Id="Timestamp-71318c38-b4e8-46a5-af91-72348be37458"><wsu:Created>2005-02-27T00:12:47Z</wsu:Created><wsu:Expires>2005-02-27T00:17:47Z</wsu:Expires></wsu:Timestamp></wsse:Security></soap:Header><soap:Body><string xmlns="http://tempuri.org/">
<rdf:RDF
xmlns:meetingmaker="&meetingmaker;"
xmlns:ical="&ical;"
xmlns:rdf="&rdf;"
xmlns:rdfs="&rdfs;"
xmlns:xsd="&xsd;"
>
<meetingmaker:MeetingMaker rdf:ID="meetingmaker_id">
<meetingmaker:criteria rdf:datatype="&xsd;string">majority</meetingmaker:criteria>
<meetingmaker:algorithm rdf:datatype="&xsd;string">parallel</meetingmaker:algorithm>
<meetingmaker:uid rdf:datatype="&xsd;string">julio@ntime.com.br-02-26-2005 09:12:45</meetingmaker:uid>
<meetingmaker:vevent>
<ical:Vevent rdf:ID="vevent_id">
<ical:location rdf:datatype="&xsd;string">Puc</ical:location>
<ical:summary rdf:datatype="&xsd;string">Apresentacao de Trabalho</ical:summary>
<ical:dtstart rdf:datatype="&xsd;datetime">12-10-2004 10:00:00</ical:dtstart>
<ical:dtend rdf:datatype="&xsd;datetime">12-10-2004 11:00:00</ical:dtend>
<ical:contact rdf:datatype="&xsd;string">julio@ntime.com.br</ical:contact>
<ical:attende>
<rdf:Bag rdf:ID="vevent_ateende">
<rdf:li rdf:datatype="&xsd;string">kid@teccomm.les.inf.puc-rio.br</rdf:li><rdf:li rdf:datatype="&xsd;string">fred.kid@gmail.com</rdf:li><rdf:li rdf:datatype="&xsd;string">fsilva@inf.puc-rio.br</rdf:li>
</rdf:Bag>
</ical:attende>
</ical:Vevent>
</meetingmaker:vevent>
</meetingmaker:MeetingMaker>
</rdf:RDF></string></soap:Body></soap:Envelope>
(whitch is a valid XML, at least the Internet explorer open it...)
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How was this XML generated in the first place? I suspect that if you change the order of the entities whichever you put first will be what's reported in the exception.
Please post a snippet of your code that you're using to generate the XML (SOAP) to hopefully give us a better idea of what could be wrong.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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