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kutbinayi wrote: Ok, thank you for all of your replies.
You're welcome 
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Hello,
i have a strange problem with a TextBox.
I use a TextBox to show a ComPort Log. A communication Thread fires a datarecieved event and the Form with the Textbox handles this Event and uses Invoke to change the Content of the (multiline) TextBox.
void ComPortLog_PropertyChangedEvent() {
MethodInvoker ComPortLogChanged = delegate {
textBox2.Text = ComPortLog.Log;
};
if (textBox2.InvokeRequired) Invoke(ComPortLogChanged);
else ComPortLogChanged();
}
After a Timespan (0-30 Minutes) this stops Working? The string in ComPortLog.Log is correct and complete but the string in the Textbox.Text isnt...
somehow this isnt working anymore:
textBox2.Text = ComPortLog.Log;
The string in textBox2.Text is truncated to a value which differs from program run to programrun. Why? The Length of the ComPortLog.Log string is far below MaxLength Property of the textbox.
I tried to use a richTextBox instead, i tried to use the Lines Property instead of Text Property but nothing helps.
The Textbox refuses to show the complete ComPortLog.Log string after a while.
Any suggestions/ideas about this?
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The situation isn't quite clear, and a lot of things could go wrong. Here are some suggestions:
1.
as a test, forget about the GUI, just collect the serial port information and log it to a file, using File.AppendAllText. See if that fails at all.
2.
add try-catch constructs to all related code, and log all exceptions (their ToString value) in a separate file, again File.AppendAllText is the right method.
If you need further assistance, please provide more context, a complete description of your serial source, your serial port's code, and examples of the data when it fails.
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Hi,
The Program controls a spectrometer via serail port and triggers multiple measuremets and than collects and processes the results. And it works fine... except the textBox which does not show the ComPortLog in the Program correctly.
to 1: there is already a routine which saves the Log to a File and it also works fine. The textfile contains the complete log string.
to 2: already done... almost every possible exception is catched and written to the trace.
The serialport Communication isn't the problem (i think) because it works without problems, like the whole program. The measurement results are all valid...
I use an own ComPort Class and not the .Net SerialPort due to its unreliability.
If data is send or recieved an Event is fired
public event Action<string> OnSendReceive;
if (OnSendReceive != null)
OnSendReceive(ComPort.PortName + ": Recieved: " + message);
if (OnSendReceive != null)
OnSendReceive(ComPort.PortName + ": Send: " + command);
these Events are handled by a DeviceManager Class which then adds a Timestamp to the string and calls the writeline Method of a global instance (defined in MDI ParentForm) of the following class:
public class LogString {
public delegate void changedEvent();
public event changedEvent PropertyChanged;
private StringBuilder log;
public string Log { get { return log.ToString(); } }
public int Length { get { return log.Length; } }
public string BackupFileName { get; set; }
public LogString(string InitialString = null) {
BackupFileName = null;
log = new StringBuilder(InitialString);
}
public override string ToString() {
return log.ToString();
}
public void Write(string txt) {
log.Append(txt);
UpdateFile();
FireEvent();
}
public void WriteLine(string txt) {
log.AppendLine(txt);
UpdateFile();
FireEvent();
}
public void ClearLog() { log.Clear(); FireEvent(); }
public bool SaveToFile(string FileName, FileMode FMode) {
try {
using (Stream Str = new FileStream(FileName, FMode))
using (TextWriter TW = new StreamWriter(Str))
TW.Write(this.log.ToString());
} catch { return false; }
return true;
}
private void UpdateFile() {
if (BackupFileName != null) {
using (Stream Str = new FileStream(BackupFileName, FileMode.Append))
using (TextWriter TW = new StreamWriter(Str))
TW.Write(message);
}
}
private void FireEvent() {
if (PropertyChanged != null) PropertyChanged();
}
}
So the Log is written to a File on the Disk an the PropertyChanged Event is fired.
there is a separate Form, which shows the Logs in TextBoxes:
public partial class LogWindow : Form {
private Tools.StringTraceListener STL;
private MainWindow parent;
private MethodInvoker ComPortLogChanged, ProgramLogChanged;
private string ComPortLog = string.Empty, ProgramLog = string.Empty;
public LogWindow(Tools.StringTraceListener st, MainWindow p) {
InitializeComponent();
parent = p;
STL = st;
STL.PropertyChanged += new PropertyChangedEventHandler(STL_PropertyChanged);
parent.ComPortLog.PropertyChanged += new Classes.Tools.LogString.changedEvent(ComPortLog_PropertyChangedEvent);
this.CreateHandle();
ComPortLogChanged = delegate {
textBox2.Text = ComPortLog;
textBox2.SelectionStart = textBox2.Text.Length;
textBox2.ScrollToCaret();
};
ProgramLogChanged = delegate {
textBox1.Text = ProgramLog;
textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();
};
}
void ComPortLog_PropertyChangedEvent() {
ComPortLog = string.Empty;
ComPortLog = parent.ComPortLog.Log;
if (this.InvokeRequired) Invoke(ComPortLogChanged);
else ComPortLogChanged();
}
void STL_PropertyChanged(object sender, PropertyChangedEventArgs e) {
ProgramLog = string.Empty;
ProgramLog = STL.Trace;
if (this.InvokeRequired) Invoke(ProgramLogChanged);
else ProgramLogChanged();
}
}
This works fine for a while and the Log in the Textbox looks like this:
...
27.09.2011 18:12:37 COM3: Recieved: !01 000000 000071 000291 000106 000150
27.09.2011 18:12:37 COM3: Send: #01c170
27.09.2011 18:12:39 COM3: Recieved: !01 000000 000170 000235 000202 000289
27.09.2011 18:12:39 COM3: Send: #01c171
27.09.2011 18:12:41 COM3: Recieved: !01 000000 000171 000502 000202 000305
27.09.2011 18:12:41 COM3: Send: #01c172
27.09.2011 18:12:44 COM3: Recieved: !01 000000 000172 000521 000203 000309
27.09.2011 18:12:44 COM3: Send: #01c650
27.09.2011 18:12:46 COM3: Recieved: !01 000000 000650 000081 002057 002081
27.09.2011 18:12:46 COM3: Send: #01c651
27.09.2011 18:12:48 COM3: Recieved: !01 000000 000651 000200 002049 002079
27.09.2011 18:12:48 COM3: Send: #01c652
27.09.2011 18:12:50 COM3: Recieved: !01 000000 000652 000207 002046 002088
27.09.2011 18:12:51 COM3: Send: #01c070
27.09.2011 18:12:54 COM3: Recieved: !01 000000 000070 000126 000105 000138
27.09.2011 18:12:54 COM3: Send: #01c071
27.09.2011 18:12:56 COM3: Recieved: !01 000000 000071 000289 000105 000151
27.09.2011 18:12:56 COM3: Send: #01c170
27.09.2011 18:12:58 COM3: Recieved: !01 000000 000170 000199 000201 000299
27.09.2011 18:12:58 COM3: Send: #01c171
27.09.2011 18:13:01 COM3: Recieved: !01 000000 000171 000503 000201 000303
27.09.2011 18:13:01 COM3: Send: #01c172
27.09.2011 18:13:03 COM3: Recieved: !01 000000 000172 000538 000201 000317
27.09.2011 18:13:03 COM3: Send: #01c650
27.09.2011 18:13:05 COM3: Recieved: !01 000000 000650 000077 002045 002070
27.09.2011 18:13:05 COM3: Send: #01c651
27.09.2011 18:13:07 COM3: Recieved: !01 000000 000651 000202 002044 002075
27.09.2011 18:13:08 COM3: Send: #01c652
27.09.2011 18:13:10 COM3: Recieved: !01 000000 000652 000205 002049 002078
27.09.2011 18:13:11 COM3: Send: #01c070
27.09.2011 18:13:13 COM3: Recieved: !01 000000 000070 000119 000106 000146
27.09.2011 18:13:13 COM3: Send: #01c071
27.09.2011 18:13:15 COM3: Recieved: !01 000000 000071 000292 000106 000143
27.09.2011 18:13:15 COM3: Send: #01c170
27.09.2011 18:13:18 COM3: Recieved: !01 000000 000170 000221 000202 000300
27.09.2011 18:13:18 COM3: Send: #01c171
but after a couple of minutes (up to 30) it stops working, and the Text in the Textbox does not change anymore and seem truncated:
...
27.09.2011 18:14:56 COM3: Recieved: !01 000000 000171 000513 000204 000303
27.09.2011 18:14:56 COM3: Send: #01c172
27.09.2011 18:14:58 COM3: Recieved: !01 000000 000172 000546 000204 000304
27.09.2011 18:14:59 COM3: Send: #01c650
27.09.2011 18:15:01 COM3: Recieved: !01 000000 000650 000087 002070 002095
27.09.2011 18:15:01 COM3: Send: #01c651
27.09.2011 18:15:03 COM3: Recieved: !01 000000 000651 000198 002071 002102
27.09.2011 18:15:03 COM3: Send: #01c652
27.09.2011 18:15:05 COM3: Recieved: !01 000000 000652 000197 002071 002102
27.09.2011 18:15:06 COM3: Send: #01c070
27.09.2011 18:15:08 COM3: Recieved: !01 000000 000070 000124 000107 000142
27.09.2011 18:15:09 COM3: Send: #01c071
27.09.2011 18:15:11 COM3: Recieved: !01 000000 000071 000283 000107 000145
27.09.2011 18:15:11 COM3: Send: #01c170
27.09.2011 18:15:13 COM3: Recieved: !01 000000 000170 000216 000204 000303
27.09.2011 18:15:13 COM3: Send: #01c171
27.09.2011 18:15:15 COM3: Recieved: !01 000000 000171 000531 000203 000319
27.09.2011 18:15:15 COM3: Send: #01c172
27.09.2011 18:15:18 COM3: Recieved: !01 000000 000172 000505 000203 000307
27.09.2011 18:15:18 COM3: Send: #01c650
27.09.2011 18:15:20 COM3: Recieved: !01 000000 000650 000080 002070 002097
27.09.2011 18:15:20 COM3: Send: #01c651
27.09.2011 18:15:22 COM3: Recieved: !01 000000 000651 000212 002071 002098
27.09.2011 18:15:22 COM3: Send: #01c652
27.09.2011 18:15:25 COM3: Recieved: !01 000000 000652 000209 002071 002102
27.09.2011 18:15:26 COM3: Send: #01c070
27.09.2011 18:15:28 COM3: Recieved: !01 000000 000070 000116 000107 000140
27.09.2011 18:15:28 COM3: Send: #01c071
27.09.2011 18:15:30 COM3: Recieved: !01 000000 000071 000290 000107 000146
27.09.2011 18:15:30 COM3: Send: #01c170
27.09.2011 18:15:32 COM3: Recieved: !01 000000 000170 000230 000203 000297
27.09.2011 18:15:32 COM3: Send: #01c171
27.09.2011 18:15:35 COM3: Recieved: !01 000000 000171 00054
All the event are fired correctly, and the textbox flashes as it still trys to scroll to the end but Command
textBox2.Text = ComPortLog; doesn't work correctly... the string ComPortLog contains the complete ComPort Log but the Text Property of the TextBox doesn't...
it is a complete Mystery for me...
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Rather than attempting to write a string that's getting bigger and bigger, why don't you simply append to a listbox? It would be far simpler.
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You are rigth, but handling a string with a Length of 100k or more isnt a Problem. I've put many megabytes of stings in textboxes without any problem (ok, it get slow eventually...)
btw: the Log gets flushed every hour, so the string does not become too big.
The thing is, I want to understand, whats going wrong here...
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OlivierPD wrote: I use an own ComPort Class and not the .Net SerialPort due to its unreliability.
I never had any trouble with SerialPort except for one issue: it did not exist prior to .NET 2.0 so I needed my own class back then, which I dumped soon after SerialPort emerged.
OTOH I have had lots of trouble when putting lots of characters in a TextBox, so I stopped stuffing more than 10K long ago. For logging, I always use a ListBox, it is a natural fit.
If "All ... is correct" as you keep saying, then it can't go wrong, can it? And yet it does, so your logic is flawed; when the whole thing doesn't work as it should, then each and every part is suspect, you can't exclude some parts from scrutinizing.
I don't see a mystery, I see some "sub-optimal" design choices.
One thing that clearly changes when your TextBox.Text grows in size is timing: the amount of time the main thread is busy re-processing (mostly old) information may cause some problem in your code to emerge, e.g. a synchronization flaw between some of your threads or asynchronous actions; or too much delay in reacting to incoming serial data; or many other things.
Extensive logging (to a file and NOT to the GUI), timestamped with millisecond accuracy is likely to reveal what is really going on.
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How long is the string when it stops working?
Is it simply truncating, or is it not updating at all? Try setting the text to DateTime.Now + ": " + ComPortLog.Log or something.
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the Length of the string when ist stops working is different each Time i start the Program (pretty weird...)
i tried to set the textbox.Text property to string.Empty before assigning the Logstring -> exactly the same...
the string that is assigned to the textbox.Text is only a part of the Logstring...
During a Propram run its always the same part. if i clos the program and restart it, the error occur to a different time and the leght of the part is different...
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I am final year computer engg. student and i have selected project named scheduling & tracking of vehicle. I am confused that how to start it,first of all what should I do.My sir told me to search goggle maps algorithms.Plz give me your guidance.Please mail me to pragna07prajapati@gmail.com as soon as possible...
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Pragya7 wrote: I am confused that how to start it
Start by considering what data your application will need and design a class to hold and manage that information.
Pragya7 wrote: My sir told me to search goggle maps algorithms
Have you done that yet?
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Yes...there are many algorithms and i think i should go by shortest path algo.
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Don't put your email in posts. (Do you want to be buried under a pile of spam? You can bet that spam crawlers will be trawling CP.) You should edit that ASAP.
Have you done what your lecturer suggested? Google Maps has an extensive API and it sounds like you're expected to use that.
If you're in your final year and you don't know how to start a project, perhaps you have chosen the wrong career.
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Well, the normal place to start with an assignment like this is to actually define what the problem is that you are trying to solve. If you don't know what the problem is, how can you hope to solve it. As it stands, your title is too vague - you can't get a feel for the problem from it. When you talk about tracking, what are you actually talking about? Are you talking about receiving signals back from the vehicles with their current co-ordinates (in which case, you are looking at messaging, message compression, communications, and a whole lot more).
When it comes to road routing algorithms, it's traditional to look at Dijkstra and A* algorithms, but there are a lot of things to consider here. Here are some points to ponder (there are lots more, but these should get you started):
1. Not all vehicles are equal. Some roads are accessible for one type of vehicle, but not another.
2. Not all roads are equal. Different roads have different speeds
3. Not all parts of all roads are equal. Roads have different speeds at different sections.
4. Not all parts of all roads are equal all of the time. Congestion, planned closures, accidents, etc, affects the speed of roads.
Above all, this is your chance to shine. Your final project is your chance to prove that you have the skills necessary to join the world of the professional programmer. With this thought foremost in your mind, consider how a professional should approach this problem. Talk to users. Document requirements. Perform analysis and design your application. Test your code works, and test your code copes with bad inputs. If you can, get others to test your code as well; have well defined tests that cover negative tests as well as positive ones.
Most of all. Have fun - this is the project where you really get to shine. I wish you luck.
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It's easy...just follow these simple steps....
1. Open a text editor...
2. Type the following: "Sir, I wish to quit my current course, since despite the fact I'm in my final year, I really don't have a clue what I'm doing, so being a computer programmer isn't for me...btw - can I haz rply soon - iz urgentz"
3. Print this document.
4. Hand to your lecturer as soon as physically possible
5. Decide on a new career
C# has already designed away most of the tedium of C++.
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Hi, i'm working on a 2 player board game which plyer 1 runs in C# and player 2 in Java.... i'm using thread to pass data using XMLserilization and JAXB Marshaller in java.
I want to do C# part in WPf and its gives exception
"invalidOperationException" "The calling thread cannot access this object because a different thread owns it"
heres my c# code and wpf... someone pls help....
**************************CORRECT c# CODING**************************
private void button1_Click(object sender, EventArgs e)
{
GameData g = new GameData();
g.Turn = true;
g.PlayerValue = int.Parse(textBox1.Text);
FileStream fs = new FileStream(@"C:\Users\IsH\Desktop\Podi wadak\GameData\GameData.xml", FileMode.Create);
XmlSerializer xs = new XmlSerializer(typeof(GameData));
xs.Serialize(fs, g);
fs.Close();
button1.Enabled = false;
Thread.Sleep(2000);
Thread t2 = new Thread(new ThreadStart(getData));
t2.Start();
}
getdata metherd
public void getData()
{
GameData g = null;
do
{
try
{
FileStream fs = new FileStream(@"C:\Users\IsH\Desktop\Podi wadak\GameData\GameData.xml", FileMode.Open);
XmlSerializer xs = new XmlSerializer(typeof(GameData));
g = (GameData)xs.Deserialize(fs);
fs.Close();
Thread.Sleep(2000);
}
catch (Exception ex)
{
}
} while (g.Turn != false);
if (this.InvokeRequired)
{
callMethod m = new callMethod(getData);
this.Invoke(m);
}
else
{
textBox2.Text = "" + g.PlayerValue;
button1.Enabled = true;
}
}
*********************************************************************
here is my wpf code wich gives me the error
private void button1_Click(object sender, RoutedEventArgs e)
{
GameData g = new GameData();
g.Turn = true;
g.PlayerValue = int.Parse(textBox1.Text);
FileStream fs = new FileStream(@"C:\Users \IsH\Desktop\Podi wadak\WpfApplication1\GameData\GameData.xml", FileMode.Create);
XmlSerializer xs = new XmlSerializer(typeof(GameData));
xs.Serialize(fs, g);
fs.Close();
button1.IsEnabled = false;
Thread.Sleep(2000);
Thread t2 = new Thread(new ThreadStart(getData));
t2.Start();
}
****************Get DATA Method that gives the error********************
public void getData()
{
GameData g = null;
do
{
try
{
FileStream fs = new FileStream(@"C:\Users\IsH\Desktop\Podi wadak\WpfApplication1\GameData\GameData.xml", FileMode.Open);
XmlSerializer xs = new XmlSerializer(typeof(GameData));
g = (GameData)xs.Deserialize(fs);
fs.Close();
Thread.Sleep(2000);
}
catch (Exception ex)
{
}
} while (g.Turn != false);
if (this.Dispatcher.Thread == Thread.CurrentThread)
{
callMethod m = new callMethod(getData);
this.Dispatcher.BeginInvoke(m);
}
else
{
textBox2.Text = "" + g.PlayerValue;
button1.IsEnabled = true;
}
}
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You cannot access UI controls from another thread. Use the Dispatcher. In this case you've simply got your if test the wrong way around, though I think Dispatcher.RequiresInvoke or something like that will be better.
On a broader level, though, your data reading thread shouldn't be directly setting things in the view anyway. It should notify the view model that the game data has changed, probably by assigning to a property on the view model, and then that should notify the view. The data binding in WPF should manage the cross thread issue itself in that case.
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BobJanova wrote: I think Dispatcher.RequiresInvoke or something like that will be better.
They changed the name for WPF:
Dispatcher.CheckAccess() (Returns true on the GUI thread, false otherwise)
Dispatcher.VerifyAccess() (Throws an exception if not on the GUI thread)
Just FYI.
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Got it....
public void getData()
{
GameData g = null;
do
{
try
{
FileStream fs = new FileStream(@"C:\Users\IsH\Desktop\Podi wadak\WpfApplication1\GameData\GameData.xml", FileMode.Open);
XmlSerializer xs = new XmlSerializer(typeof(GameData));
g = (GameData)xs.Deserialize(fs);
fs.Close();
Thread.Sleep(2000);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
} while (g.Turn != false);
if (this.Dispatcher.CheckAccess())
{
callMethod m = new callMethod(getData);
this.Dispatcher.Invoke(m);
}
else
{
Action job = delegate
{
textBox2.Text = "" + g.PlayerValue;
button1.IsEnabled = true;
};
textBox2.Dispatcher.Invoke(job);
}
}
*********************** thanks everybody for your help........
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Thanks ... I'll try to remember (though I'll probably fail, as I'm not using WPF in actual code).
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hi i am using window 7, and vs2008.net c#
i want to capture my screen image and identify words from a certain section.
is this possible? anyidea how its implemented? i am trying to make a school project. thanks
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One way to achieve this would be to use OCR to read the text in from that position in the image. It's not going to be easy - OCR is not a trivial task. Andrew Kirillov is probably the best place to start to get an idea of how complex this is. Try his article here[^] for more information.
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Not a real "solution", just a theoretical long-shot. How are you gonna clip the area that you need to capture under the cursor?
No, don't asnwer - once you're there, you need to realize that you'll have to run this CPU-intensive task on each mouse-move.
It would have been more realistic to answer that it's not possible, even though one could think of a dozen workarounds. It would have even been more rewarding if you explained the difference between a control and a picture, and would have explained that one (with a bit of work) can fetch it's text[^] if it ain't a drawing - asking whether his project would be limited by this.
Bastard Programmer from Hell 
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Eddy Vluggen wrote: No, don't asnwer - once you're there, you need to realize that you'll have to
run this CPU-intensive task on each mouse-move.
Actually, sod that, I will answer - seeing you thought it necessary to one vote. Read what he actually asked, not what you took it to mean. At no stage did he mention basing the read on mouse position. You have overcomplicated the problem, and haven't actually answered what he asked.
This is what he really asked:
"hi i am using window 7, and vs2008.net c#
i want to capture my screen image and identify words from a certain section.
is this possible? anyidea how its implemented? i am trying to make a school project. thanks"
Now, where does that say anything about mouse position? So, my answer still stands.
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Pete O'Hanlon wrote: Actually, sod that, I will answer - seeing you thought it necessary to one vote. Read what he actually asked, not what you took it to mean. At no stage did he mention basing the read on mouse position. You have overcomplicated the problem, and haven't actually answered what he asked.
You're right, I interpreted his question and jumped to a conclusion. He doesn't say anything about capturing the text under the mouse-cursor.
And yes, I strongly disagreed with someone whose answers are usually valuable - hence the one. I can see my mistake and will rectify it after posting this reasoning. Next time, I'll make it a two if I simply disagree. 1's imply a lot of crap, which it certainly is not.
Pete O'Hanlon wrote: Now, where does that say anything about mouse position? So, my answer still stands.
It indeed does not say that.
Bastard Programmer from Hell
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