C# Discussion Boards - CodeProject

Christian Graus3-Jun-07 12:57

3-Jun-07 12:57

The way to call methods in a C++ dll from C# is pinvoke. www.pinvoke.net has heaps of examples of calling existing Win32 APIs, which should give you a clear idea of the syntax required.

Christian Graus - Microsoft MVP - C++
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"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 )

"Main" method

SPRC3-Jun-07 8:35

SPRC

3-Jun-07 8:35

I understand why the "Main" method needs to be in a class. But it appears that the name of that class can be pretty much anything! Is there some generally accepted name that is used most frequently for the "Main" containing class? I guess C# will find the "Main" method no matter what - yes?

Re: "Main" method

Christian Graus3-Jun-07 11:23

Christian Graus

3-Jun-07 11:23

SPRC wrote:
I guess C# will find the "Main" method no matter what - yes?

Yes, and typically, the point is that you don't need a class just to have that main method in there, it gets added usually to the first form class that is shown by your app.

Loged in user Information?

Gul_#3-Jun-07 8:09

Gul_#

3-Jun-07 8:09

How can I get information about user that is currently log on on windows Xp through web.

i.e A user access a particular page 'XYZ.com' then in response the page opens with user name 'ABC'

Re: Loged in user Information?

andre_swnpl3-Jun-07 20:08

andre_swnpl

3-Jun-07 20:08

You can't realy. The best you can do is to call HttpRequest.LogonUserIdentity.

Web application

mushy3-Jun-07 7:27

mushy

3-Jun-07 7:27

Created Logon Screen using integrated authentication, How to get Uncpath of Home directory so that user can access their home folders from home for remote downloading and uploading

thnks

Re: Web application

Christian Graus3-Jun-07 11:25

Christian Graus

3-Jun-07 11:25

Your main issue will be that an ASP.NET application doesn't have permission to access the file system above it's root. What do yuo mean by Uncpath of home directory ? What do you mean by 'access their home folders from home' ? Do you mean that you are writing a web app which will run on the home machine and give a user access to that machine remotely ?

string class handling.... aligment etc...

Arish rivlin3-Jun-07 5:48

Arish rivlin

3-Jun-07 5:48

hi.
I need to concut a string in C# so that it will be aligned to the left.
for example:

dd/mm/yyy message1 line
dd/mm/yyy message222 line
dd/mm/yyy message566455 line

etc...
note: it's not possible here but the intention was for all the "line"s to be one on top of the other....
Thanks....

Re: string class handling.... aligment etc...

Luc Pattyn3-Jun-07 5:59

Luc Pattyn

3-Jun-07 5:59

strings are aligned to the left (at least if you write from left to right).

if you are painting to the screen, it may help to choose a "non-proportional" font,
such as "Courier New" so all characters have the same width;
maybe you want a DateTime format that applies leading zeroes,
and you might show your message number using a fixed number of digits:
num.ToString("000000") will generate at least 6 characters, using leading zeroes.

If you are painting on a Graphics, you can use MeasureString() to get the string
width in pixels, and adjust coordinates accordingly (but that would be useful only
if you do NOT want to align to the left).

Hope this helps.

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

c# - protected and protected internal

jon-803-Jun-07 5:18

jon-80

3-Jun-07 5:18

A newbie question:

protected
Access is limited to the containing class or types derived from the containing class

protected internal
Access is limited to the current assembly or types derived from the containing class.

(MSDN)

What does 'assembly' refer to? Is it the same application or the same class?

protected internal combines protected and internal, but in an OR sense, not an AND sense (pro c#).

What does this mean?

Jon

Re: c# - protected and protected internal

WillemM3-Jun-07 6:02

WillemM

3-Jun-07 6:02

jon_80 wrote:
What does 'assembly' refer to? Is it the same application or the same class?

This is the same unit of code that is place on disk. In normal language: This is the .exe or .dll file in which the class sits.

jon_80 wrote:
protected internal combines protected and internal, but in an OR sense, not an AND sense (pro c#).

You can only access a protected internal member, if you inherit from that class and you are in the same assembly. I think the book is wrong here, as you can't access protected members even if they are also internal. Might want to reread that part, because I'm pretty sure they didn't mean it that way.

WM.

What about weapons of mass-construction?
"What? Its an Apple MacBook Pro. They are sexy!" - Paul Watson

Re: c# - protected and protected internal

Dave Doknjas3-Jun-07 12:48

Dave Doknjas

3-Jun-07 12:48

The book is right - protected internal means "protected OR internal" - the member can be accessed within the same assembly OR in any derived type, even if that derived type is outside of the assembly.

David Anton
www.tangiblesoftwaresolutions.com
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Re: c# - protected and protected internal

Expert Coming3-Jun-07 6:02

Expert Coming

3-Jun-07 6:02

An assembly in .NET is one of two things, the .EXE file you make when you compile, or the .DLL file. So an assembly is the whole application, not just a class.

To answer your other question I'll have to define internal as well.

protected is an access modifier that limits access to the current class or classes derived from the current class.

internal is an access modifier that limits access only to the currect assembly.

protected internal is an access modifier that limits access to only derived classes in the current assembly.

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

Re: c# - protected and protected internal

originSH3-Jun-07 21:59

originSH

3-Jun-07 21:59

Nope, as David said in a comment above 'proteced internal' means protected OR internal.

Loading a bitmap into an ImageList

Mark F.3-Jun-07 3:35

Mark F.

3-Jun-07 3:35

I have a single bitmap image that is comprised of 16 images (like a toolbar bitmap). I use the following to load the image into my imagelist.

Image img = Image.FromFile("jsiml.bmp");
 treeViewImageList.Images.AddStrip(img);

The problem is that the bitmap file must always be in the application folder. How can I add the bitmap as a resource and load the resource?

TIA,
Mark

Re: Loading a bitmap into an ImageList

Luc Pattyn3-Jun-07 3:46

Luc Pattyn

3-Jun-07 3:46

Hi,

Visual can show you how to do this.
Example: add an icon to your app, look at what code gets generated.

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: Loading a bitmap into an ImageList

Mark F.3-Jun-07 4:45

Mark F.

3-Jun-07 4:45

I see what you mean. Anyway I used the following which works.

Image img = (Bitmap)JsLib.Properties.Resources.jsiml;
treeViewImageList.Images.AddStrip(img);

I also had to change the "Build action" property for the bitmap to "Embedded resource".

Mark

Re: Loading a bitmap into an ImageList

Luc Pattyn3-Jun-07 5:10

Luc Pattyn

3-Jun-07 5:10

That's fine.

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: Loading a bitmap into an ImageList

Thomas Stockwell3-Jun-07 8:04

Thomas Stockwell

3-Jun-07 8:04

To add an image as an embedded resource:
1)RightClick the project or folder in project in the Solution Explorer
2)Select Add an Existing Item
3)Locate the bitmap (I prefer clicking the arrow on the open button to choose the add as link. By doing this the latest bitmap will always be added in the build)
4)RightClick the bitmap in the project
5)In the properties window change the build action or where it says content and in the combo box make the value Embedded Resource

To use the bitmap in your code:
Bitmap b=new Bitmap(/*stream object*/this.GetType().Assembly.GetManifestResourceStream("{projectname}{.foldername if bitmap is in a folder}.{filename});

or something along those lines.

Regards,
Thomas Stockwell

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

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user control with a datagridview

zwan133-Jun-07 3:27

zwan13

3-Jun-07 3:27

I'm developing a user control which is build with a datagridview, and others controls.

When I use this control in my application at desing time, I'd like to access de properties of the datagridview embebed in my control to add columns. I've created a public property to expose de grid, something like this:

<br />
private System.Windows.Forms.DataGridView _grid;<br />
<br />
[Description("Description"), Category("mycategory"), EditorBrowsable]<br />
public System.Windows.Forms.DataGridView Grid<br />
{<br />
   get { return _grid; }<br />
   set { _grid = value; }<br />
}<br />

My problem is that I can't access the Columns property at desing time (In the property editor. I get this error:
Object reference not set to an instance of an object.

Then I decide to expose a property for the datagrid columns:

<br />
[Description("My Description"), Category("MyCategory"), EditorBrowsable]<br />
public DataGridViewColumnCollection MyColumns<br />
{<br />
  get { return this.grid1.Columns; }<br />
}<br />

Now I've binded the grid to a TableDataAdapter returned by a Web Sevice. My problen now is when I add a new column, the column is not show at execution time. (At desing time I can see the column added). I think that in execution time the grid executes the databinding and rewrites my added column. The same happens if I want to hide one of the columns returned by my Web Service, in execution time the column is visible.

Perhaps doing it programatically I could add and hide columns , but I want to do it the easiest possible for de developers who are going to use this control.

Thanks.

Re: user control with a datagridview

xibeifeijian3-Jun-07 4:05

xibeifeijian

3-Jun-07 4:05

Just change "private System.Windows.Forms.DataGridView _grid;" to
private System.Windows.Forms.DataGridView _grid=new DataGridView(); Roll eyes | :rolleyes:

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Re: user control with a datagridview [modified]

zwan133-Jun-07 4:35

zwan13

3-Jun-07 4:35

I forgot to post that I've an instance of the grid (In the code behind):

this.grid1 = new Mycontrols.Controles.Grid(this.components);

So that is not the problem.

Thank you.

-- modified at 10:52 Sunday 3rd June, 2007

Service that continously reads keyboard and make a log file?

Gul_#3-Jun-07 2:51

Gul_#

3-Jun-07 2:51

I want to make a service which continuously listen the key board and make a entry in log file that have the actions that have been performed through keyboard????????

Re: Service that continously reads keyboard and make a log file?

WillemM3-Jun-07 4:30

WillemM

3-Jun-07 4:30

Hmm, sounds like a keylogger...

WM.

What about weapons of mass-construction?
"What? Its an Apple MacBook Pro. They are sexy!" - Paul Watson

Re: Service that continously reads keyboard and make a log file?

Dave Kreskowiak3-Jun-07 5:08

Dave Kreskowiak

3-Jun-07 5:08

Yeah, you're not going to get any help with something that, 99% of the time, is only used illegally.

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Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

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