Re: How to open and read a file as a unicode char - C# Discussion Boards

Re: Windows form global object

Christian Graus4-Aug-07 0:47

Christian Graus

4-Aug-07 0:47

You forgot to make somequery static :p

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Windows form global object

Colin Angus Mackay4-Aug-07 0:50

Colin Angus Mackay

4-Aug-07 0:50

Christian Graus wrote:
You forgot to make somequery static

Oops!

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Re: Windows form global object

Krugger4044-Aug-07 0:58

Krugger404

4-Aug-07 0:58

Thanks pal.It did solve my issue.

Re: Windows form global object

Manoj Kumar Rai4-Aug-07 0:49

Manoj Kumar Rai

4-Aug-07 0:49

Create one Singleton class.
This should have a member of type "OdbcConnection"
The connection to the database should be stablished in the constroctor of this class.
This class should have a member function to return the object of type "OdbcConnection".

Manoj
Never Gives up

Re: Windows form global object

Colin Angus Mackay4-Aug-07 0:52

Colin Angus Mackay

4-Aug-07 0:52

Manoj Kumar Rai wrote:
This class should have a member function to return the object of type "OdbcConnection".

Why an OdbcConnection?

How to open and read a file as a unicode char

Life as a Coder3-Aug-07 23:32

Life as a Coder

3-Aug-07 23:32

How to open a file as a unicode char?
I used this :

<part of my code>
FileStream fs = new FileStream(open.FileName, FileMode.Open,FileAccess.Read);
StreamReader sr = new StreamReader(fs, Encoding.Unicode);

while (sr.Peek() != -1)
{
System.Console.WriteLine(sr.Read());
}
<end of my code>

But somehow it missed some characters.

In a file contain:
FF D8 FF D8 FF D8 FF E0 00 10 4A 46 49 46 00 01

My code only manage to read:
FF E0 00 10 4A 46 49 46 00 01

Anybody have the answer? Thanks before.

Training makes perfect....

Re: How to open and read a file as a unicode char

Luc Pattyn3-Aug-07 23:52

Luc Pattyn

3-Aug-07 23:52

Hi,

your file is not a text file, it looks very much like an image file using
JFIF format (a special version of JPEG). You can not open it as text; you could
open it as a binary file if that is what you really want.

Its main purpose is to let you load an image as in
Bitmap bm=Bitmap.FromFile("myFileName");

Smile | :)

Luc Pattyn

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Re: How to open and read a file as a unicode char

Life as a Coder4-Aug-07 0:03

Life as a Coder

4-Aug-07 0:03

No... I want to open file whatever it is.
The main purpose is to open file like UltraEdit32 or somethine like that (hex editor).

So it can open every file and read it as a binary.
but somehow my program miss some hex like i said before.

thanks Smile | :)

Training makes perfect....

Re: How to open and read a file as a unicode char

Luc Pattyn4-Aug-07 0:17

Luc Pattyn

4-Aug-07 0:17

If you want to create an app that can read all file types, you must use
binary file operations, not text operations.
Text operations work for text files only, binary operations work for all
file types.

So you should use the BinaryReader class, you should not use anything that
is text oriented such as:
StreamReader.ReadLine()
File.ReadAllLines()
File.ReadAllText()
FileInfo.OpenText()
...
that is everything that has "Text" or "Line" in its name, or returns
a string or a char or a char[]. To read arbitrary data, you need a byte[].

If you decide the byte[] represents text after all, you can try and decode it using
the Text.Encoding class

MSDN holds an article "How to: Read and Write to a Newly Created Data File"
that should be of interest to you.

Smile | :)

Luc Pattyn

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Re: How to open and read a file as a unicode char [modified]

Guffa4-Aug-07 0:51

Guffa

4-Aug-07 0:51

Life as a Coder wrote:
But somehow it missed some characters.

No, it didn't. A unicode file starts with a BOM (byte order mark). That is not text, but a code that represents how the file is encoded.

-- modified at 11:04 Saturday 4th August, 2007

However, the bytes at the beginning of the file doesn't match any of the existing byte order marks. I believe that Mark has the correct explanation, and that your file simply isn't a valid unicode file.

---
single minded; short sighted; long gone;

Re: How to open and read a file as a unicode char

Mike Dimmick4-Aug-07 3:36

Mike Dimmick

4-Aug-07 3:36

0xD8FF is a 'high surrogate' in UTF-16. It represents the first of a two code-unit pair that encodes a character outside the 16-bit Basic Multilingual Plane (anything over U+10000). Because it's not followed by the second code unit of the pair, a low surrogate, it's simply discarded as being illegal.

'Encoding.Unicode' really refers to the 16-bit scheme of encoding Unicode called UTF-16 or UCS-2. See UTF-16/UCS-2[^] on Wikipedia.

As the others have said, use a binary stream class, e.g. FileStream, and a method of reading that returns a byte array.

Stability. What an interesting concept. -- Chris Maunder

Is it possible to enable controls on the form from a class.

Janu_M3-Aug-07 23:23

Janu_M

3-Aug-07 23:23

Hi I am developing a C# windows application in .net1.1
In this i have a form, in which i am taking the input parameters, if the parameters are valid i am passing the paramers to a method which is in another class. while passing the paramers i am disabling some buttons on the form. After completing the process i want to enable the buttons on the form from the class.
Is it possible to enable controls on the form from a class.

Thanks in Advance

Ramu

Re: Is it possible to enable controls on the form from a class.

Luc Pattyn3-Aug-07 23:54

Luc Pattyn

3-Aug-07 23:54

Ramu.M wrote:
Is it possible to enable controls on the form from a class

yes

Luc Pattyn

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Re: Is it possible to enable controls on the form from a class.

Janu_M4-Aug-07 0:11

Janu_M

4-Aug-07 0:11

plz tell me how to do it? (Any guidelines of code)
Thanks for your reply

Re: Is it possible to enable controls on the form from a class.

Colin Angus Mackay4-Aug-07 0:26

Colin Angus Mackay

4-Aug-07 0:26

The other class must know about the form - so you must pass details of the form to the other class (remember, forms are classes too) somehow. Then the class can access the form. You must provide a mechanism on the form to receive the request

class MyForm : Form
{
    ...
 
    // The form class needs a mechanism to receive the request to
    // disable the controls.
    public void DisableControls()
    {
        // Code to disable the controls goes here
    }
}
 
class MyOtherClass
{
    // The other class needs to store the form
    private MyForm myForm;
 
    // In this example the other class gets told about the form at
    // the time it is instantiated. It could also set up a property
    // to receive that information.
    public MyOtherClass(MyForm myForm)
    {
        this.myForm = myForm;
    }
 
    // The class has some code somewhere that needs to disable the
    // controls on the form.
    public SomeMethodThatNeedsToDisableTheControls()
    {
        ...
        myForm.DisableControls();
        ...
    }
}

Does this help?

Re: Is it possible to enable controls on the form from a class.

Luc Pattyn4-Aug-07 0:32

Luc Pattyn

4-Aug-07 0:32

If you hold a reference to the form, you can manipulate everything on it that is
declared public, as in myForm.myButton.Enabled=true;

But it is considered bad design to make controls public, since everyone holding
the reference (myForm) can also replace, resize, move, hide, ... said control.
In fact, it is almost always wrong to provide public fields, only methods and
properties should be candidates for the public attribute.

An acceptable approach is:
- keep the controls private (or protected) to your form class;
- provide public methods (or properties) inside your form class, that offer
the required functionality to the outside world, no more, no less;
- pass the form's reference to your class and have it use the public methods
or properties.

And if you are familiar with delegates, they offer the best approach. It basically
means your form creates a delegate (that's like a function pointer connected
to the form's object), so now it can pass that delegate to your class, without
even having to pass the form's reference itself. That is encapsulation, provide
as little as possible, just give what is absolutely necessary.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
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Re: Is it possible to enable controls on the form from a class.

Developer6114-Aug-07 0:14

Developer611

4-Aug-07 0:14

Hi .
Yes you can , something like following code :

<br />
public class ControlForm<br />
{<br />
     public static void EnableTextBox()<br />
     {<br />
          FrmTest frmTest = new frmTest();<br />
          frmTest.txtName.Enable = true;<br />
     }<br />
}<br />

Important :Set your control modifier property to Internal or Public
Bad Programming :Don't try to do this . It's not a smart coding .

DMASTER

Re: Is it possible to enable controls on the form from a class.

Manoj Kumar Rai4-Aug-07 0:27

Manoj Kumar Rai

4-Aug-07 0:27

Even you can use Delegates for Enabling/Disabling controls of the Form. The Delegate will remove the requirement to declare control objects (Text etc) public.

Manoj
Never Gives up

Re: Is it possible to enable controls on the form from a class.

Colin Angus Mackay4-Aug-07 0:33

Colin Angus Mackay

4-Aug-07 0:33

Manoj Kumar Rai wrote:
The Delegate will remove the requirement to declare control objects (Text etc) public.

Text is a parameter on the control. You cannot make that public. You must make the control public, or create a new property on the form that proxies for the control's property.

Re: Is it possible to enable controls on the form from a class.

Manoj Kumar Rai4-Aug-07 0:37

Manoj Kumar Rai

4-Aug-07 0:37

Yes Yes, You are corrrect. I meant TextBox there.

Manoj
Never Gives up

Re: Is it possible to enable controls on the form from a class.

Janu_M4-Aug-07 0:41

Janu_M

4-Aug-07 0:41

Thank you very much.

Ramu

Re: Is it possible to enable controls on the form from a class.

Developer6114-Aug-07 0:44

Developer611

4-Aug-07 0:44

I'm already say it .

So , what ... Confused | :confused:

DMASTER

To genrate a log in text box

Hum Dum3-Aug-07 21:49

Hum Dum

3-Aug-07 21:49

I want to genrate a log of event in text box?
How can i do that?

Actually i am regularly looking up an event and when event is being raised then its appropriate message is get printed in text box.

But it get printed on same text(of event), means previous text erased and new text(of event) get printed?

I want every event text appears like log,
I tried Environment.NewLine but no use?

How to acheive this.
Plz help

Re: To genrate a log in text box

Christian Graus3-Aug-07 22:03

Christian Graus

3-Aug-07 22:03

humdumof wrote:
I tried Environment.NewLine but no use?

How did you try ?

tb.Text = tb.Text + Environment.NewLine + log;

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: To genrate a log in text box

Hum Dum3-Aug-07 22:28

Hum Dum

3-Aug-07 22:28

thanks?

Actually i m coding like
tb.Text = event + Environment.NewLine;

not adding previous text?
After writing like this problem solved.

tb.Text = tb.Text + event + Environment.NewLine;

Thanks for helping.

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