C# Discussion Boards - CodeProject

Re: Reading From a text file

11-Apr-02 8:13

Since I'm not a Java programmer I have no idea what JAI includes, but GDI+ (which .NET incorporates) incorporates transparency, alpha blending, gradients, texture brushes, antialiasing, and more.

James

Simplicity Rules!

Re: C# and Imaging

Nick Parker12-Apr-02 6:52

Nick Parker

12-Apr-02 6:52

Charles Petzold's book on C# is full of information on this topic.

Nick Parker

Reading From a text file

Gavin_Mannion11-Apr-02 5:23

Gavin_Mannion

11-Apr-02 5:23

Hi All,

I have a text file which will hold some details for my application.
I am now trying to read these details to display them in my application.
I know how to open a file and setup a StreamReader Big Grin | :-D

, but how can I make my reader only read from a certain position or even better search for a certain keyword and then read from there?

Thanks,
Gavin

James T. Johnson11-Apr-02 22:42

Re: Reading From a text file

11-Apr-02 22:42

If its a text file you should probably use a TextReader instead of a StreamReader. You can use the Seek method of the reader to move or position; but if you are looking for a specific thing you will probably have to read through the file until you find what you are looking for.

James

Simplicity Rules!

Gavin_Mannion11-Apr-02 23:50

Gavin_Mannion

11-Apr-02 23:50

I tried using the TextReader but it didn't have the seek option and I couldn't find anything else which was helpful.

I need to pick up 3 different things from this file, but I can't figure out how to read through the file and select a certain thing?

Or is there a better way to do this other than using a static file.
I just need to store some small strings.

Thanks

Re: Reading From a text file

SimonS11-Apr-02 23:01

SimonS

11-Apr-02 23:01

Here's some code:

static void Main(string[] args)
    {

const int iReadTotal=10;
const int iReadStart=10;

FileStream f = new FileStream ("C:\\test.vbs",System.IO.FileMode.Open, System.IO.FileAccess.Read);
f.Seek(iReadStart,System.IO.SeekOrigin.Current);
StreamReader st = new StreamReader(f);

char[] buffer=new char[iReadTotal];
st.ReadBlock(buffer,0,buffer.Length);

string s="";
for(int i=0;i<buffer.Length;i++)
  s+=buffer[i].ToString();

Console.WriteLine(s);
Console.Read();
    }

HTH

Cheers,
Simon

"I get paid for my brain and my thinking in several obscure worlds", Olli, The Lounge

DataGrid

Mazdak11-Apr-02 2:46

Mazdak

11-Apr-02 2:46

I want to use database in connected mode with DataReader.After I use ExecuteReader() I waana fill DataGrid with it but I can't add row to DataGrid dynamicly or show the table in DataGrid in Connected mode.

OleDbCommand command = new OleDbCommand ( "select * from Tennis", this.myoleDbConnection );


myoleDbConnection.Open ();


OleDbDataReader reader = command.ExecuteReader ( );


while ( reader.Read () )
{
//How can I fill DataGrid?????
}
reader.Close ();
myoleDbConnection.Close ();

Mazy

"The path you tread is narrow and the drop is shear and very high,
The ravens all are watching from a vantage point near by,
Apprehension creeping like a choo-train uo your spine,
Will the tightrope reach the end;will the final cuplet rhyme?"Cymbaline-Pink Floyd

James T. Johnson11-Apr-02 8:11

11-Apr-02 8:11

I don't think you can fill the datagrid directly, you have to use a datatable at the very least.

James

Simplicity Rules!

Mazdak11-Apr-02 21:27

Mazdak

11-Apr-02 21:27

Yes,thats the thing I find out today,So I think when I want use DataReader it is not good idea to use DataGrid and ListView is better option for it.Beacaue for DataGrid I have to use DataSet or DataTable so I have to do one extra operation.Whats your opinion about it?

Thanks Smile | :)

SimonS11-Apr-02 23:03

SimonS

11-Apr-02 23:03

[my 2 cents]
Using a listview is a far better option.
Short of prototyping, I don't see a place for large scale databinding in applications.

Cheers,
Simon

"I get paid for my brain and my thinking in several obscure worlds", Olli, The Lounge

Andres Manggini12-Apr-02 9:08

Andres Manggini

12-Apr-02 9:08

[my 2 cents too]

I understand this using the old databinding control (see VB 6 controls), but with the new ADO.NET model I think things have changed, the combination of Connection, DataAdapter, DataSet and DataGrid should work a lot better.

Anyway, I haven't done any testing yet.

Andres Manggini.
Buenos Aires - Argentina.

James T. Johnson12-Apr-02 9:49

12-Apr-02 9:49

Correct, the VB6 controls sucked because they always kept a connect to the database open, so you could count on there being x number of connections at any one time.

With the .NET model you open a connection, get the data, then close the connection; everything is operated on in a disconnected state. Once you're done editing you can ignore the changes or open another connection and make the changes.

James

Simplicity Rules!

Carlos Antollini12-Apr-02 10:25

Carlos Antollini

12-Apr-02 10:25

You need to use a datactrl, then assign the datagrid to datacontrol and in your code asign the dataset to datactrl

Best Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Mazdak12-Apr-02 11:03

Mazdak

12-Apr-02 11:03

DataSet work in disconnected mode,I wanna use connected mode. Smile | :)

Speedup app startup time

paulb10-Apr-02 14:08

paulb

10-Apr-02 14:08

Is there any way to speed up the startup time of a winforms application? The thing takes nearly a minute to startup! This is on a pretty low end machine (P133) but it runs fine once it's going.

James T. Johnson10-Apr-02 14:18

10-Apr-02 14:18

You can run the install time JITter on it.

ngen [assembly name] In this case Assembly Name would be the executable.

James

Sonork: Hasaki
"I left there in the morning
with their God tucked underneath my arm
their half-assed smiles and the book of rules.
So I asked this God a question
and by way of firm reply,
He said - I'm not the kind you have to wind up on Sundays."
"Wind Up" from Aqualung, Jethro Tull 1971

paulb10-Apr-02 19:05

paulb

10-Apr-02 19:05

That didn't seem to make much difference. oh well.

James T. Johnson10-Apr-02 19:06

10-Apr-02 19:06

Are you running the command on the machine you are testing it on? You could also run ngen on any non-system assembly that you use.

James

Sonork: Hasaki
"I left there in the morning
with their God tucked underneath my arm
their half-assed smiles and the book of rules.
So I asked this God a question
and by way of firm reply,
He said - I'm not the kind you have to wind up on Sundays."
"Wind Up" from Aqualung, Jethro Tull 1971

paulb10-Apr-02 19:23

paulb

10-Apr-02 19:23

Yes, I ran it on the machine its running on. It seemd to make no difference at all in startup time.

James T. Johnson wrote:
You could also run ngen on any non-system assembly that you use.

I dont quite understand this?

The program is a database app... when started nothing happens for a while then the UI starts to draw then nothing happens again for a while, then finally the rest of the UI draws and away we go. Maybe the connection to the database is whats slow? (although its just a local MDB database).

Nick Parker11-Apr-02 5:47

Nick Parker

11-Apr-02 5:47

paulb wrote:
Maybe the connection to the database is whats slow? (although its just a local MDB database).

Beings that your db is local, I can only assume the time delay could be related to the processor speed(P133 and .NET application?).

Nick Parker

Kannan Kalyanaraman16-Apr-02 0:42

Kannan Kalyanaraman

16-Apr-02 0:42

Is ur machine on a domain based network, if thats the case there is a bug in the framework (which can be worked around) which increases the app startup time. It has something to do with the 'aspnet' user account which needs to be configured on the deployed machines under the 'guest' users. I happen to see this on the .net mailing list.
If this isnt (the machine not on a domain) the case, I think you will have to accept the fate.

Cheers
Kannan