C# Discussion Boards - CodeProject

5-Jan-04 9:52

For an example of encapsulating a custom method and struct, use a decompiler like .NET Reflector[^] and see how the FileDialog and its derivative classes work. That's the best thing I can tell you.

You could just have a simple native function in a native DLL that you can call, passing parameters as necessary or use a struct like the OPENFILENAME struct, though you could cut down on the members needed for your implementation.

As for the other idea, neither the GetOpenFileName, GetSaveFileName, or the OPENFILENAME struct accept positional values. Since the FileDialogs merely use these functions and structs, it won't know either (nor does it have positional properties of its own). You'll have to get a HWND of the dialog instead, most likely using FindWindow, and you could try encapsulating this by extending the NativeWindow class (a managed wrapper for existing windows) and use AssignHandle, passing the HWND that you got from FindWindow. You could then figure out the position and track it with another window.

There might be an easier way to do this alternative, but this is just off the top of my head and without any research. You could search to see if an easier / better way exists.

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Easy Form Question

Guinness4Strength5-Jan-04 6:19

Guinness4Strength

5-Jan-04 6:19

Anyone ?

How do I prevent the user from resizing my Form ?
i.e. Dragging the edge of the dialog box to make it wider/taller.

AND/OR

How do I resize a Tab Control ?

Re: Easy Form Question

Heath Stewart5-Jan-04 7:04

5-Jan-04 7:04

Guinness4Strength wrote:
How do I prevent the user from resizing my Form ?

Set your Form.FormBorderStyle to FormBorderStyle.FixedDialog. Also, this question was just asked and answered this morning. Please search comments before posting.

Guinness4Strength wrote:
How do I resize a Tab Control ?

Same as any other control - just set its TabControl.Size (as a Size struct - setting the individual properties will not work since it's a value type), or set the TabControl.Width and TabControl.Height properties. All these properties inherit from Control.

Re: Easy Form Question

Niels Penneman5-Jan-04 10:11

Niels Penneman

5-Jan-04 10:11

Did you mean resizing a tab control in the designer? You must make sure you don't select a tab page, to resize the control you must select the whole tab control (do not click on a tab or page).

To restrict the size of your form you could also use MinimumSize & MaximumSize

greetz
Niels Penneman

Run a External EXE File

hxxbin5-Jan-04 6:16

5-Jan-04 6:16

Hi
I'm trying to do a Windows Service for a EXE file based at Console. But I don't know how run this file at the background, anyone knows??

Thanks

Heath Stewart5-Jan-04 7:00

5-Jan-04 7:00

This question doesn't make sense. Are you trying to start a normal application? See Process.Start. Are you trying to start a Windows Service? See the ServiceController class. You can find more information about these in the .NET Framework SDK.

hxxbin5-Jan-04 7:07

5-Jan-04 7:07

Let me explain about.

I already have a console application, that controls a RH DB, and need to be started from a logged user into a w2k server. For this reason, I was thinkin' create a Windows Service, that run this application without a logged user, like any service as IIS.

I will check Process.Start but it could be helpful any extra information that you can give me about.

Thanks.

Heath Stewart5-Jan-04 7:37

5-Jan-04 7:37

Windows Services do run under user credentials, be they SYSTEM, SERVICE, IUSR_COMPUTERNAME (default for IIS), or a specified user. It just doesn't have to be executed by a logged-in user.

You could use a Windows Service, but you should then use the ServiceController class. If you want to allow interaction by controller applications by the user (like a Control Panel applet or some application), you'll need to allow for desktop interaction. If you use the ServiceInstaller and ServiceProcessInstaller classes to install the service, you'll have to use the Microsoft.Win32.Registry class and related classes to set this property in the registry. If you don't need to use an installer (for example, for mass deployment) then you could just use the Services snap-in to do it manually.

hxxbin5-Jan-04 8:42

5-Jan-04 8:42

Thanks for the help

Now, the Services run on my machine, I'm trying to make a Installer with the Deploy Template, but isn't work, the application installutil is installed with the .NET Distribution???, I don't wanna install de .NET Framework SDK into the server.

Heath Stewart5-Jan-04 9:37

5-Jan-04 9:37

Yes it is, but you have to add the Framework path to your PATH environment variable or execute installutil.exe using the fully-qualified path. The path for .NET 1.0 is %WINDIR%\Microsoft.NET\Framework\v1.0.3705 and for .NET 1.1 %WINDIR%\Microsoft.NET\Framework\v1.1.4322.

Make sure your Installer class is attributed with the RunInstallerAttribute. For an example, see the ServiceInstaller class documentation (for the class itself).

hxxbin5-Jan-04 11:33

5-Jan-04 11:33

It's Works Finally, Thanks you are so helpful. The WinService now is running, and I installed into the server, I didn't need add manually.

I'm happy now Big Grin | :-D

Cryptography Question

Mazdak5-Jan-04 4:09

Mazdak

5-Jan-04 4:09

Today I start some playing with Cryptograhy classes and I encounterd a problem,I hope someone can display it for me.

I create a file and encrypt it to another file to see the value. It works Ok,then I do it again with the same key but changed the value of IV for the key,the output changed ! Now I decrypt these two output with the same key but different IV and they decrypt to original values correctly. The question is:

I changed vectors(IV) for the key and I get different ENCRYPTED value but changing IV return the same DECRYPTED value.

Thanks

Mazy

No sig. available now.

Heath Stewart5-Jan-04 5:18

5-Jan-04 5:18

Different initialization vectors (IV) should produce different content with symmetric encryption. It's the key that is important and must remain the same. The encrypted content is often different - especially with asymmetric algorithms - because a number of factors are used to encrypt the content. For example, often the IV is randomly generated, and random generators are often seeded with an aspect (like ticks) of the current time.

If you're interested in cryptography, you should read Applied Cryptography, 2^nd Edition[^] by Bruce Schneier, one of the leading cryptoanalysts (and a good writer to boot) today.

Mazdak5-Jan-04 7:46

Mazdak

5-Jan-04 7:46

Thanks Heath,I don't understand whats the role of IV from the docs I have,can you give me your view about it?

Thanks for the book too,I'll buy it,now I'm reading .NET Framework Security[^]. Its a little hard for me but little by little I'm going through it. Smile | :)

Mazy

No sig. available now.

Heath Stewart5-Jan-04 9:32

5-Jan-04 9:32

An IV is a way to increase security by introducing variance when encrypting the input data. It is a nonsecret (not necessarily shared) key.

How can I find resource values like Cut/Copy/Paste names in Win?

Mazdak5-Jan-04 10:03

Mazdak

5-Jan-04 10:03

hmmmmmm,I got some clues. Smile | :)

Mazy

No sig. available now.

A.Wegierski5-Jan-04 1:57

A.Wegierski

5-Jan-04 1:57

I want to get international names of menu items on mouse right click. How to get them using standard .net classes without using Win functions?

Hi,
AW

Re: How can I find resource values like Cut/Copy/Paste names in Win?

Heath Stewart5-Jan-04 5:10

Re: How can I find resource values like Cut/Copy/Paste names in Win?

5-Jan-04 5:10

ResX files. Read about localization in the .NET Framework and see the ResourceManager class documentation for details and examples. Basically, you use ResX files to store localized strings for your application. For properly named ResX files (like ClassName.de.resx for culture-neutral German language), a satellite assembly is created that the CLR loads when the Thread.CurrentUICulture is set to something other than the neutral resources language (the language of the resource in your source code, see also the NeutralResourcesLanguageAttribute for more information and use this to increase assembly resolution performance).

You'll have to put all the values for Cut, Copy, Paste, and anything else in the ResX files. I recommend using a Singleton pattern for the ResourceManager like Microsoft does so that you can 1) eliminate wasted memory resources by having a single instance of a ResourceManager, and 2) easily share localized resources amongst many classes. If you use a disassembler or decompiler to look at Microsoft's BCL assemblies, you'll notice this in their SR classes (usually one per assembly).

This won't get them from Windows, but there really isn't a way to do that. Windows MUI usually stores localized resources per application or library. This way with .NET is pretty much the same thing (specially named libraries or similarly named libraries in specially name directories is common).

A.Wegierski5-Jan-04 20:55

A.Wegierski

5-Jan-04 20:55

I thought I can get option names from standard context menu for right mouse click. Thx.

Hi,
AW

Some simple C# calculator application questions.

Link26004-Jan-04 22:58

Link2600

4-Jan-04 22:58

I'm designing a Calculator application in C#. However, I have some
questions about it.

1.) How can I enter multiple lines in a Message Box? For example:

MessageBox.Show("This Calculator was originally designed on Java. It was modified by Alex in C#.", "About this Calculator");

It will display it in a whole sentance like this:
This Calculator was originally designed on Java. It was modified by Alex in C#.

However, I want to split into two sentance like this:
version v1.0
This Calculator was originally designed on Java.
It was modified by Alex in C#.

2.) Also, I wonder if it is possible to include a link to my e-mail in
the Message Box?

3.) How can I stop people from resizing the form (frame)?

4.) How can I disable the maximize button (but I want to keep the
minimize and close buttons) like how the Calculator in the Windows
XP did it.

Thanks.

Re: Some simple C# calculator application questions.

Colin Angus Mackay4-Jan-04 23:09

Colin Angus Mackay

4-Jan-04 23:09

1. Inject Environment.NewLine in to the string at the appropriate point.
2. Not that I know of
3. Choose a FormBorderStyle that does not permit resizing (e.g. FixedSingle)
4. Set MaximizeBox to false

--Colin Mackay--

Re: Some simple C# calculator application questions.

Link26004-Jan-04 23:26

Link2600

4-Jan-04 23:26

First of all, thanks for your reply.

I'm a C# and windows programming newbie, can you be more
specific with some codes?

1. Inject Environment.NewLine in to the string at the appropriate point?
What do you mean?

3. public class Calculator : System.Windows.Forms.Form
that is the class. so how do I choose FixedSingle?

4. How can I set the MaximizeBox to false?

Re: Some simple C# calculator application questions.

Colin Angus Mackay4-Jan-04 23:50

Colin Angus Mackay

4-Jan-04 23:50

1. string.Concat("Line 1 Test", Environment.NewLine, "Line 2 Text")

3. You should have been able to find that very easily in the documentation. Search MSDN (or Google) to get full information about it. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsformclassformborderstyletopic.asp[^]

4. Again, read the documentation. MaximizeBox (and FormBorderStyle) is on the Form class. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemWindowsFormsFormClassMaximizeBoxTopic.asp[^]

--Colin Mackay--

Re: Some simple C# calculator application questions.

Heath Stewart5-Jan-04 5:00