Re: How to run any custom application from code depending upon file extension? - C# Discussion Boards

_ra14-Jul-06 9:35

14-Jul-06 9:35

I have a list<t> such as for example:

// simplfied class:
class someObject{
private int i;

setI(int i)
{
this.i = i;
}
}

List<someobject> list1 = new List<someobject>

list1.add(someObject);
list1.add(someObject);
list1.add(someObject);

so there are objects in the list that store integers or some other numerical values.
Now I need to get the object that stores the largest element:
so I tried this:

someObject s = GetLargestObject();

public someObject GetLargestObject()
{
double largestobject= 0;

return list1.Find(delegate(someObject o)
{
if (o.I > largestobject)
{
largestobject= o.I;
}

return true;
});
}

of course that doesn't work...any ideas on how to get this to work?
Is there a way to get find to work?

_ra

Write a comparer for some object

Ennis Ray Lynch, Jr.14-Jul-06 9:40

Ennis Ray Lynch, Jr.

14-Jul-06 9:40

Then you can sort the list using the comparer.

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Re: Write a comparer for some object

_ra14-Jul-06 10:28

_ra

14-Jul-06 10:28

I know I can sort it, the thing is I need to preserve the order.
One way of course would be to copy the list and then sort the copy, but again I don't want to do this.

_ra

Re: Write a comparer for some object

Ravi Bhavnani14-Jul-06 10:38

Ravi Bhavnani

14-Jul-06 10:38

You don't need to sort the list. Just iterate through the list and use the comparer to compare the current item with the currently largest item. Alternatively, implement a CompareTo() method on your object. (You'll still need to iterate thru the list).

/ravi

My new year's resolution: 2048 x 1536
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ravib(at)ravib(dot)com

Re: how to get largest element from list

BoneSoft14-Jul-06 12:01

BoneSoft

14-Jul-06 12:01

public class SomeObject {
    private int i;
    public Int Value {
        get { return i; }
        set { i = value; }
    }
}

class Thingy {
    List list1 = null;
    // blah blah blah

    private SomeObject GetBiggest() {
        SomeObject biggest = null;
        foreach (SomeObject so in list1) {
            if (biggest == null || biggest.Value < so.Value) {
                biggest = so;
            }
        }
        return biggest;
    }
}

Try code model generation tools at BoneSoft.com.

How to run any custom application from code depending upon file extension?

Waqas Nasir14-Jul-06 6:54

Waqas Nasir

14-Jul-06 6:54

Hi,
Can any body tell me how to run any custom application depending upon the file extension through the code in .NET, for example if the file is "test.doc" then checking the extension, the MS Word application is launched and the document is opened... how can we encorporate that in .NET code...

Thanks,
Regards.

Re: How to run any custom application from code depending upon file extension?

Andrew Lygin14-Jul-06 7:03

Andrew Lygin

14-Jul-06 7:03

Hi, you can use Process.Start() method. It will open an application wich is associated with the file extension.

System.Diagnostics.Process.Start(fileName)

Re: How to run any custom application from code depending upon file extension?

Waqas Nasir14-Jul-06 7:12

Waqas Nasir

14-Jul-06 7:12

Thanks alot... for the quick reply... well can you please help me a bit more, I have to wait for that process to complete or to close, and have to block the code till the application ends... will be a great favor...

Thanks again.
Regards.

Re: How to run any custom application from code depending upon file extension?

Ennis Ray Lynch, Jr.14-Jul-06 7:15

Ennis Ray Lynch, Jr.

14-Jul-06 7:15

Process process = new Process();
process.StartInfo = new ProcessStartInfo(fileName);
process.Start();
process.WaitForExit();

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Re: How to run any custom application from code depending upon file extension?

Waqas Nasir14-Jul-06 7:20

Waqas Nasir

14-Jul-06 7:20

Thanks alot...

God bless you...

Regards,

Waqas.

Send it to the shell

Ennis Ray Lynch, Jr.14-Jul-06 7:04

Ennis Ray Lynch, Jr.

14-Jul-06 7:04

XP handles this processing for you if you let it. Just start a process with test.doc as the name.

System.Diagnostics.Process.Start("c:\\test.txt"); will open said text file if it exists.

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Ideas on how to stream audio [modified]

BambooMoon14-Jul-06 6:52

BambooMoon

14-Jul-06 6:52

I have a receiver connected to the sound card of a computer through the Line In port. Currently, I have some old, unpleasant C++ code that captures the sound to a file locally. What I want to do now is to write some C# code instead that captures the sound off the sound card and uses probably UDP to send packets of the sound data to another computer, which will then play that streamed sound. I need some ideas of how to go about this, if anyone has any helpful suggestions. I would need to know:

1) How in C# to capture sound from the sound card on the system connected to the receiver.

2) How on the other machine to feed the incoming sound packets to ?? DirectSound or Windows Media Player ?? so that the user can hear it as it comes in.

It is not really a constant stream of data, like a streamed radio station (though to be quite honest I don't know how streamed radio stations work either). The user on the second computer chooses which receiver-equipped-computer he wants to connect to in order to receive sound.

I'm basically clueless on the two points above, so I would appreciate any suggestions.

-- modified at 12:52 Friday 14th July, 2006

Dataset output to Label [modified]

NiPsTeRs14-Jul-06 6:37

NiPsTeRs

14-Jul-06 6:37

ok folks, i am currently using a dataset that pulls data from sql server database and wish to show the results in a label. can someone point me in the right direction or even show me how to do this.

Thanks in advanced Smile | :)

PS: i am building a web application not a windows form.

-- modified at 12:39 Friday 14th July, 2006

Re: Dataset output to Label

Not Active14-Jul-06 6:56

Not Active

14-Jul-06 6:56

First thing if this is a web app then the APS.NET forum would probably be more appropriate.

Does this dataset contain multiple records or a single result?

label.Text = ds.tables[0].Rows[0][0].ToString();

Or use a databound container such a repeater and create a template that includes a label control.

Another byte to int question

Tom Wright14-Jul-06 6:29

Tom Wright

14-Jul-06 6:29

What is the best way to move a 8 digit number from a byte array to an int?

This is how I did it:

public void OnReceivedData(byte[] ByteBuffer)
{
//Encoding enc = ;
int myTracking = Convert.ToInt32(ByteBuffer[32]+ByteBuffer[33]+ByteBuffer[34]+ByteBuffer[35]+ByteBuffer[36]+ByteBuffer[37]+ByteBuffer[38]+ByteBuffer[39]);
MessageBox.Show(myTracking.ToString());

}
This there a better way?

Thanks

Tom Wright
tawright915@yahoo.com

Re: Another byte to int question

Andrew Lygin14-Jul-06 7:20

Andrew Lygin

14-Jul-06 7:20

Hi, Tom. What does "move a 8 digit number from a byte array to an int" mean? In your solution you just sum up 8 numbers. You even can discard Convert.ToInt32().

What is the data in the byte array

Ennis Ray Lynch, Jr.14-Jul-06 7:23

Ennis Ray Lynch, Jr.

14-Jul-06 7:23

byte[] array = {0x0,0x0,0x15,0x75} = 1964310528 as Int32

however array[0] + array[1] + array[2] + array[3] = 138

byte[] array = {0x0,0x0,0x15,0x75};
MemoryStream ms = new MemoryStream(array);
System.IO.BinaryReader br = new System.IO.BinaryReader(ms);
int abc = br.ReadInt32();

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Re: What is the data in the byte array

stancrm14-Jul-06 8:53

stancrm

14-Jul-06 8:53

There is a better way instead of using MemoryStream.
See this:

byte[] array = { 0x0, 0x0, 0x15, 0x75 };
int abc = BitConverter.ToInt32(array, 0);

I figured

Ennis Ray Lynch, Jr.14-Jul-06 9:22

Ennis Ray Lynch, Jr.

14-Jul-06 9:22

I was just way too lazy to look. (Did I just admit ignorance?) Anyways, I only wrote the code to illustrate the example of the problem of the data of the binary array.

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Re: What is the data in the byte array

Tom Wright7-Aug-06 11:16

Tom Wright

7-Aug-06 11:16

Mind if I ask another Byte array question?
in my code:

<br />
		private void WriteRecord(byte[] ByteBuffer, int TrackNumber, string recType)<br />
		{<br />
			//Get Query record and write response to it. <br />
			SqlConnection myConnection = new SqlConnection(strConnect);<br />
			try<br />
			{<br />
				String myBuffer; <br />
				myBuffer = Encoding.UTF8.GetString(ByteBuffer, 0, ByteBuffer.Length);<br />
				MessageBox.Show("My Buffer" + myBuffer);<br />
				myBuffer.Replace("'", " ");<br />
				myConnection.Open();<br />
				SqlCommand myCommand = new SqlCommand("EXEC LA_SP_NYSPINRESPONSE '"+ recType +"', 'P', '"+ myBuffer +"', " + TrackNumber, myConnection);<br />
				myCommand.Connection = myConnection;<br />
				myCommand.ExecuteNonQuery();<br />

When I try to convert this byte array to a string then display it in a message box, I get nothing. The problem is that in this string there is a single quote i need to remove so that it will write properly to the database. Right now with it comes to that single quote it thinks it's the end of the string and errors out.

So is there a better way to convert a byte array to a string?

Thanks
Tom

Tom Wright
tawright915@gmail.com

string building

spin vector14-Jul-06 6:20

spin vector

14-Jul-06 6:20

quick question. Using Console.WriteLine I have use the syntax:

Console.WriteLine("my string = '{0}'", new objects[] { str } );

where /str/ gets inserted into the {0} placeholder.

How do I use similar syntax when I'm just building a string to return from a method?

Thx.

Re: string building

led mike14-Jul-06 6:24

led mike

14-Jul-06 6:24

return String.Format("my string = '{0}'", new objects[] { str } );

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

Re: string building

spin vector14-Jul-06 6:31

spin vector

14-Jul-06 6:31

great, thanks.

Re: string building

Andrew Lygin14-Jul-06 6:57

Andrew Lygin

14-Jul-06 6:57

This is not an answer but just a recomendation. You can use more simple and more quick way:
Console.WriteLine("my string = '{0}'", str);

Removing drop down choices based on dataset

leckey14-Jul-06 6:04

leckey

14-Jul-06 6:04

I have an application where a datagrid populates based on a part number. The user can enter new items to the datagrid via dropdown boxes and text fields.

What I want to know how to do, is that if a certain choice from the drop-down box already exists in the database, no longer make it an option in the drop down box.

For example, three types of costs populate in drop down box
Cost 1
Cost 2
Cost 3

User chooses Cost 2 and enters. Datagrid populates and shows the Cost 2 entry.

Now the user wants to enter another type of cost, but there should never be two types of costs for the same part number, so now I want the drop down box to show

Cost 1
Cost 3

Is this possible?

Thanks!

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