C# Discussion Boards - CodeProject

exception error caused by reading text file

Latheesan12-Jun-07 9:59

12-Jun-07 9:59

Im using something called syntax high lighting textbox library in one of my project. To be able to easily highlight syntax, i wrote this lil code:

/* Syntax Highlighting Keywords [ BLUE ] */<br />
            TextReader syntax_blue = new StreamReader("synHighLib_DB/blue.txt");<br />
            while (syntax_blue.ReadLine() != null)<br />
            {<br />
                shtb.HighlightDescriptors.Add(new HighlightDescriptor(syntax_blue.ReadLine(), Color.Blue, null, DescriptorType.Word, DescriptorRecognition.WholeWord, true));<br />
            }<br />
            syntax_blue.Close();

It compiles properly, but when i start typing into the text box, i get the unhandled exception error. Im 100% sure this is the code that causing the error, because, when i remove it, it works fine...

Re: exception error caused by reading text file

turbochimp12-Jun-07 10:34

turbochimp

12-Jun-07 10:34

Posting the exception you're receiving would be very helpful, but it looks like you're calling ReadLine twice without any assurance that you have two (or a multiple of two) lines to read. Readline is going to advance the cursor each time it's called.

Additionally, if the code above is inside an error handler, I would point out that it might not be the best choice to open and parse a text file every time a key is pressed.

Finally, a TextReader is a disposable type, so I would recommend either inserting a Try...Finally block or, better, a using (TextReader syntax_blue = ...) block instead.

The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’

Office Automation

PHDENG8112-Jun-07 8:55

PHDENG81

12-Jun-07 8:55

I need to obtain all of the bookmarks within a Word document using late binding. I have easily done this using early binding. However, I am having some trouble with the former. I know how to open and write to a file. I have the framework developed. Any help on returning the collection of bookmarks using this method would be much appreciated.

Thanks

P

Where is FolderNameEditor

Rome Singh12-Jun-07 8:35

Rome Singh

12-Jun-07 8:35

I'm trying to use the FolderNameEditor in a property grid. Like this:

[Editor(typeof(System.Windows.Forms.Design.FolderNameEditor), typeof(System.Drawing.Design.UITypeEditor))]

But it seems that FolderNameEditor is not in that namespace. Although all the documentation that I've seen says that it is. I'm using VS2005 and the 2.0 framework.

Can someone tell me where this editor is?

Re: Where is FolderNameEditor

JoeSharp12-Jun-07 19:37

JoeSharp

12-Jun-07 19:37

hi
add a reference to:
System.Design.dll and System.Drawing.Design.dll

regards

Re: Where is FolderNameEditor

Rome Singh13-Jun-07 4:58

Rome Singh

13-Jun-07 4:58

Hi,

Thanks, that's it.

I had System.Design and System.Drawing (which should have been System.Drawing.Design).

RS

How can I write text to a picturebox?

Andrew Stampor12-Jun-07 7:49

Andrew Stampor

12-Jun-07 7:49

For the project I am working on, if I cannot find an image, I am going to write the image name to the picturebox instead. However, there doesn't seem to be a straightforward property (like "Text") that I can use. Is there an easy way to do this?

Re: How can I write text to a picturebox?

Not Active12-Jun-07 7:58

Not Active

12-Jun-07 7:58

Andrew Stampor wrote:
Is there an easy way to do this?

Define easy Poke tongue | ;-P

One way would be to replace, at run time, the picture box with another control, like label, that has a text property.

To keep the picture box you would need to create an image and write the text on to it, then assign it to the picture box. There numerous examples of how to do this.

only two letters away from being an asset

Re: How can I write text to a picturebox?

Giorgi Dalakishvili12-Jun-07 8:03

Giorgi Dalakishvili

12-Jun-07 8:03

You can place a label over a picturebox and change its visibility according to existence of picture

my articles

Re: How can I write text to a picturebox?

Not Active12-Jun-07 8:21

Not Active

12-Jun-07 8:21

picturebox.visible = false;
label.visible = true;

This essentially replaces the picturebox with the label control.

only two letters away from being an asset

Re: How can I write text to a picturebox?

Andrew Stampor12-Jun-07 8:29

Andrew Stampor

12-Jun-07 8:29

I only have access to the picturebox itself. Using a label would be a good way, but I cannot rely on it.

I think I will try to override the OnPaint, but it seems like more trouble than it should be.

Re: How can I write text to a picturebox?

Not Active12-Jun-07 8:58

Not Active

12-Jun-07 8:58

Andrew Stampor wrote:
I only have access to the picturebox itself.

You can override the OnPaint event but you can't place a label control on the form? Confused | :confused:

only two letters away from being an asset

Re: How can I write text to a picturebox?

Andrew Stampor12-Jun-07 9:23

Andrew Stampor

12-Jun-07 9:23

The picturebox is inherited from and extended. I do not know which form(s) it will necessarily be on. I was able to take care of it with OnPaint. Thanks for your help, guys.

Re: How can I write text to a picturebox?

Hesham Yassin12-Jun-07 11:47

Hesham Yassin

12-Jun-07 11:47

you can use a label as a pictureBox so catch two birds in one hand Wink | ;)

Re: How can I write text to a picturebox?

Christian Graus12-Jun-07 11:16

Christian Graus

12-Jun-07 11:16

Yes, create a bitmap, draw the string onto it, and put it in the picturebox.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"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: How can I write text to a picturebox?

Muammar©12-Jun-07 19:47

Muammar©

12-Jun-07 19:47

Bitmap bm = new Bitmap(@"C:\YourPicture.bmp");            
Graphics gr = Graphics.FromImage(bm);
            gr.DrawString(""test", new Font("Verdana", (float)10, FontStyle.Bold, GraphicsUnit.Pixel), new SolidBrush(Color.Red),(float)20, (float)20);
            gr.Dispose();
            pictureBox1.Image = bm;

Smile: A curve that can set a lot of things straight!
(\ /)
(O.o)
(><)

C# Tutorial or samples for beginners

Software_Guy_12312-Jun-07 7:38

Software_Guy_123

12-Jun-07 7:38

Hello All,

I have good knowledge of Visual Basic, but coming project is in C#. If anybody can give some urls for tutorials or samples it will be helpful.

Thanks in advance.

Thanks & Regards,
Kumar

Re: C# Tutorial or samples for beginners

Tarakeshwar Reddy12-Jun-07 7:49

Tarakeshwar Reddy

12-Jun-07 7:49

Take a look these articles[^] on codeproject.

Re: C# Tutorial or samples for beginners

dino209412-Jun-07 11:37

dino2094

12-Jun-07 11:37

If you already have a background in VB then try just reading the spec at:

CSharpSpecStart

As far as book, I liked Apress' Pro C# 2005 and the .NET 2.0 Platform. I think it is a great book for those who already know programming but don't know the C# lanagauge.

Re: C# Tutorial or samples for beginners

Sathesh Sakthivel12-Jun-07 15:24

Sathesh Sakthivel

12-Jun-07 15:24

Hope this[^] link will be more Useful when you wnat to learn C#.

Regards,

Satips. Rose | [Rose]

Re: C# Tutorial or samples for beginners

Software_Guy_12313-Jun-07 16:57

Software_Guy_123

13-Jun-07 16:57

Hello All,

Thank you very much for providing some useful urls.

Thanks & Regards,
Kumar

C++ Equivalents

LimeyRedneck12-Jun-07 7:34

LimeyRedneck

12-Jun-07 7:34

I decided to make my life much harder than it is and convert some C++ code I have to C# (and possibly Java some day).

Please - no "Why do that you dummy" responses, that serves no purpose. Also, with NO EXCEPTIONS there isno single tool to take a C++ code set, reverse it to a complete UML model and re-engineer it into C# (there are numerous tools that kinda do parts, but still leave too much work. I figured out that a combination of 6(six) yes 6 tools will provide that process at a total cost to myself of too much (money and effort).
Lastly, C++ has too much complexity and I refuse to pander to it anymore than I must - AND I DO NOT WANT TO WRITE MY OWN PARSER for all the crap that's snuck into it.

Actually I'm answering some personal questions I have about development and processes in general and this seemed like a good test. Also I have a large body of "real" C++ code I'd like to rebuild in C# and I'm working on a methodology and VS tools to do it.

I selected this specific code for specific reasons and is quite large and complex (its the source code to a windows based RTS game from a few years back), and I think I have a handle on most issues.

However ....

I would like suggestions as to how to gracefully handle the following situations:
(what I'm currently doing in parens)

- TYPEDEF's (So far I've punted and done a global Search and Replace)
- Macros (Utility functions)
- Unions (distinct structs, remodelled use)
- const (removed and ignored)

Any physiologically possible solutions gratefully received and considered. If you have any additional problems in this (such as struct inheritance) please let me know.

If I get the time I'll post an article on this subject (with attributions) - I can't be the only person wishing for a NET/C# alternative to some of the s****y C++ code out there. Nor the only person who wants tools to make it more efficient.

Nothing is impossible, we just don't know the way of it yet.

Re: C++ Equivalents

Dave Doknjas12-Jun-07 13:48

Dave Doknjas

12-Jun-07 13:48

"- TYPEDEF's (So far I've punted and done a global Search and Replace)"
- I think this is the only practical way to handle typedef. You can replace certain simple cases with the C# alias syntax "using Foo = x.y.z".

"- Macros (Utility functions)"
- We handle it with search/replace combined with replacement with the simple C# flag type #define (the flag #define allows the converted #ifdef FOO directives to continue to be useful). One problem is that macros are type-less, so it's problematic to refactor these to static methods.

"- const (removed and ignored)"
- Yes, they must be removed, but they provide information for a C++ to C# conversions (especially for parameters).

C++ to C# (or to any other language) is indeed no picnic (we've recently released 'C++ to C# Converter', which eases the task somewhat, but there's just too much complexity in the C++ language to allow a high conversion rate).

David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB to C# converter
Instant VB: C# to VB converter
C++ to C# Converter: converts C++ to C#
C++ to VB Converter: converts C++ to VB
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Re: C++ Equivalents

LimeyRedneck12-Jun-07 15:39

LimeyRedneck

12-Jun-07 15:39

Valid point regarding the const - the information IS important to C++ but can be dealt with at the C# model level (remove the need).

I looked at the demo - fairly nice tool but addresses pure conversion only.

A very real secondary need (almost at the same level as pure translation) is the ability to place the C++ code into a UML model - not just the class diagrams, but sequence etc diagrams too. Then I can "Fix" some issues of the basic model, perform package management, remodel the design, etc, and regenerate/test.

I would suggest you look at CodeVizualizer (http://www.codedrawer.com/ - $50) which is a great tool for learning individual code segments but doesn't have the ability to generate all documentation I require/need for analysis, nor does it provide the big picture.
I would highly recommend it for a utility tool for a C++ maintenance/enhancement project, but it falls short of being a "corporate" architect tool.

Nothing is impossible, we just don't know the way of it yet.

Passing Structure Array to VB.NET from C# Class

jadaar12-Jun-07 7:01

jadaar

12-Jun-07 7:01

I have a class that handles encryption of passwords, and there is one part where I want to fill a structure with the following:

struct RoleValue
{
public string szRoleName;
public string szDialog;
public string szAdd;
public string szView;
public string szEdit;
public string szDel;
public string szDialogDescr;
}

public ArrayList RoleDialogAccess = new ArrayList();

//Fill the structure with data from the SQL query...

while (sqlRdr.Read())
{
rm.szRoleName = sqlRdr.GetString(0);
rm.szDialog = sqlRdr.GetString(1);
rm.szView = sqlRdr.GetString(2);
rm.szAdd = sqlRdr.GetString(3);
rm.szEdit = sqlRdr.GetString(4);
rm.szDel = sqlRdr.GetString(5);
rm.szDialogDescr = sqlRdr.GetString(6);
this.RoleDialogAccess.Add(rm);
}

This is all good.

When I get to VB is where the problem occurs.

For VB.NET to be able to access the data, I have to do the following:

Dim AEG as New AESClass
rw(0) = CStr(Me.AEG.RoleDialogAccess.Item(iCnt).szDialog)
rw(1) = CStr(Me.AEG.RoleDialogAccess.Item(iCnt).szDialogDescr)
rw(2) = CStr(Me.AEG.RoleDialogAccess.Item(iCnt).szAdd)
rw(3) = CStr(Me.AEG.RoleDialogAccess.Item(iCnt).szView)
rw(4) = CStr(Me.AEG.RoleDialogAccess.Item(iCnt).szEdit)
rw(5) = CStr(Me.AEG.RoleDialogAccess.Item(iCnt).szDel)

Now, in when done in Visual Studio 2005 there is no problem, but when I place the C# DLL into a VB Project in migrated (from VS 2003)
on XP the compiler crashes and on NT 2000 I get errors. Nothing specific about the errors, ones that must be sent to Microsoft.

What am I doing wrong?

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones."

Einstein

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