filing issues in C#

[Ahmedhussain]

Hi,
I am trying to access a file in two different classes simultaneously. Is there any solution ?

thank you in advance,

Regards,

Syed Ahmed Hussain

[r035198x]

For what purposes? Read in both, write in both? What have you tried so far?

[tlhintoq]

@Ahmedhussain
Solution to what? You haven't stated a problem.

[Ahmedhussain]

Sorry guys I was actually in a bit of hurry...

I am using sensors to get the humidity and temperature values in a hexadecimal string. I am writing those values into a file. And at the same moment this file is accessed from another class to get the values and convert them into integer valuesand then writing a delimiter in the file in order to remember that upto where I have read the file. But the problem is actually when I run the code it gives me error on file close.

Is there any solution??

This is of my first class where I am getting the values from the sensor... and writing it in a file....

 
 
private void separateTemperaturenHumidity(string reading)
        {
            Int32 RawTemp = 0;
            Int32 RawHum = 0;
            Int32 RawLight = 0;
            double TempinDegC = 0;
            double RelHuminPer = 0;
            double LightinLx = 0;
            string NodeID, Temperature, Humidity, Light;
 
 
            // Node ID
            NodeID = reading.Substring(28, 4);
            //      NodeID = NodeID + reading.Substring(45, 2);
 
            // Light Reading
            Light = reading.Substring(36, 4);
            //  Light = Light + reading.Substring(57, 2);
 
            // Temperature Reading
            Temperature = reading.Substring(40, 4);
            //  Temperature = Temperature + reading.Substring(63, 2);
 
            // Humidity Reading
            Humidity = reading.Substring(44, 4);
            //Humidity = Humidity + reading.Substring(69, 2);
 
 
 
            //Converting string into Decimal value
            RawTemp = Convert.ToInt32(Temperature, 16);
            RawHum = Convert.ToInt32(Humidity, 16);
            RawLight = Convert.ToInt32(Light, 16);
 
            // Converting Raw Temperature into Degree Centigrade
            TempinDegC = 0.01 * RawTemp - 39.6;
 
            // Converting Raw Humidity into Relative Humidity in Percentage
            RelHuminPer = (TempinDegC - 25) * (0.01 + 0.00008 * RawHum) + (-4 + 0.0405 * RawHum - 0.0000028 * RawHum * RawHum);
 
            // Converting Raw Light into Lux unit
            double V = (float)RawLight / 4096 * 1.5;
            double I = V / 100000;
 
            LightinLx = 1e6 * I * 1000;
 
 
            // Converting values into strings
            string Str_T = RawTemp + "";
            string Str_TC = TempinDegC + "";
            string Str_H = RawHum + "";
            string Str_RH = RelHuminPer + "";
            string Str_L = RawLight + "";
            string Str_Llx = LightinLx + "";
 
            // Writing to File namely SensorData.txt
            writeFile(reading, NodeID, Str_T, Str_TC, Str_H, Str_RH, Str_L, Str_Llx);
        }
 
private void writeFile(string str_packet, string NID, string RT, string TC, string H, string RH, string L, string LLx)
        {
            try
            {
                //Pass the filepath and filename to the StreamWriter Constructor
 
                StreamWriter sw = new StreamWriter(@"C:\Documents and Settings\syed\My Documents\Visual Studio 2005\Projects\Data Repositiry and Terminal\Data Repositiry and Terminal\obj\Debug\data\sensordatapackets.text", true);
                //Write a line of text
                sw.WriteLine(str_packet + " " + DateTime.Now);
                //Close the file
                sw.Close();
 
                sw = new StreamWriter(@"C:\Documents and Settings\syed\My Documents\Visual Studio 2005\Projects\Data Repositiry and Terminal\Data Repositiry and Terminal\obj\Debug\data\" + NID + "datapackets.text", true);
                //Write a line of text
                sw.WriteLine(str_packet + " " + DateTime.Now);
                //Close the file
                sw.Close();
 
            }
            catch (Exception e)
            {
                rtfTerminal.AppendText(e.StackTrace);
                System.Console.Write(e.StackTrace);
                MessageBox.Show("Exception: " + e.StackTrace);
 
            }
 
        }
 
 

And the below one is from another class...

 
 
 public void getUpdate()
        {
            char marker = '=';
            string delimitData = null;
            int k = 0;
            int j = 0;
 
 
                FileStream fs = new FileStream(@"C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\Projects\Data Repositiry and Terminal\Data Repositiry and Terminal\obj\Debug\data\Sensordatapackets.text", FileMode.Open);
 
                StreamReader sr = new StreamReader(fs);
                StreamWriter sw = new StreamWriter(fs);
                data = sr.ReadToEnd();
                j = data.Length -1;
                while ((j >= 0)&&(!(data[j].Equals('='))))
                { 
                    delimitData= delimitData+ data[j];
                        j--;
                }
 
                char[] c = delimitData.ToCharArray();
                Array.Reverse(c);
                delimitData = new String(c);
                this.packetSplitter(delimitData);
                sw.WriteLine(marker);
                k++;
 
 
        }
 
 
        public void packetSplitter(string args)
        {
            Convertor convert = new Convertor();
 
            string sensorID;
            string splitter = "\r\n";
            char replacementSplit = '-'; 
            string[] seperatePacketsTimeStamp = new string[3];
            int i = 0;
            char seperator = ' ';
            string timepatch;
 
            args = args.Replace(splitter, replacementSplit.ToString());
            string[] packets = args.Split(replacementSplit);
            int length = packets.Length;
 
            while (i < length)
            {//seperator will be used here in order to seperate the packets from eachother...
                seperatePacketsTimeStamp = packets[i].Split(seperator);
 
                if (seperatePacketsTimeStamp.Length==1)
                { i++; }
                else
                {
                    sensorID = seperatePacketsTimeStamp[0].Substring(28, 4);
 
                    timepatch = seperatePacketsTimeStamp[2] + ' ' + seperatePacketsTimeStamp[3];
 
                    this.DBCheckAndFill(timepatch, seperatePacketsTimeStamp[1], seperatePacketsTimeStamp[0], sensorID);
                    i++;
                }
 
            }
 
        }
 

[Ahmedhussain]

Just a reminder
both class should run simultaneously. and then their would be an other class of convertor as well which will convert the values but thats the part for the DB...


thanks again

Regards,

Syed Ahmed Hussain

[tlhintoq]

I am using sensors to get the humidity and temperature values in a hexadecimal string. I am writing those values into a file. And at the same moment this file is accessed from another class to get the values and convert them into integer valuesand then writing a delimiter in the file in order to remember that up to where I have read the file.

Is there a reason other than the passing of the values, for writing this data to a file? This is a rather clunky and slow way to pass data.

I would suggest you have only one class that accesses the file. Give it methods for reading and writing and updating. Your other classes can pass data to it, and ask for data from it.

But the problem is actually when I run the code it gives me error on file close

And that error would be.... ????

[Ahmedhussain]

That error comes when the first class closes the file. I dont exactly remember the error and I cant provide you the error right now because I am using Virtual PC. And its not enabling the hardware virtualization, so I can check the error when sensor passes the values.

Is there any one who could help me out in VPC problems as well. I have to submit this on monday and I am totally stucked here.

Regards,
Syed Ahmed Hussain

[tlhintoq]

I use VMware, sorry.

That error comes when the first class closes the file.

Right. You mentioned that. And it makes sense, since two files have the file open, then one closes it and the other is still expecting it to be open. Hence the earlier suggestion to only have one class controlling one file. Did you give that a try?

I have to submit this on monday

Homework assignment?

I will ask again

Is there a reason other than the passing of the values, for writing this data to a file? This is a rather clunky and slow way to pass data.

[tlhintoq]

And at the same moment this file is accessed from another class to get the values

If you want to write the data to a file so you can have a history, that's one thing... but its silly to read them back from another class in the same application. There are a number of ways to pass them directly from one class to another, completely eliminating the cause of your two-class-reading-one-file problem.

Put the data in a custom arguments class.
Raise an event with the arguments.
Have the second class subscribe to this event.
Every time class1 raises the event with the arguments, class2 will react. Just like reacting to button_click event.

[Ahmedhussain]

Dear tlhintoq,

You can say its my assignment, because I am doing my internship in CRUC (Center of Research in Ubiquitous Computing) . I am working on Ontology . We are actually creating a software that will use a reasoner in .NET to reason certain information which will be provided.

And you got that right that when the file is closed other classes are using it.

Perhaps there is a reason for writing it into a file. Can we use any file locking instead of changing the classes. I totally agreed with you for making an event handler or do all in a single class, but I talked to my professor and he asked me that he dont want to change the class schema.