config file for a class library - C# Discussion Boards

C DLL -> C# DLL possible?

S O S27-Jun-03 9:57

S O S

27-Jun-03 9:57

Is it possible to call a C# DLL(or really any other way to use C#) from a C DLL?

Re: C DLL -> C# DLL possible?

Nathan Blomquist27-Jun-03 17:32

Nathan Blomquist

27-Jun-03 17:32

Yes, but you will have to work with COM. Look into the topic of Com Interop. You will need to tell the project to register the c# dll for com interop.

Hope this helps,
Nathan

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Hmmm... what's a signature?

Re: C DLL -> C# DLL possible?

S O S28-Jun-03 8:43

S O S

28-Jun-03 8:43

Thanks

Re: C DLL -> C# DLL possible?

Nick Parker28-Jun-03 6:10

Nick Parker

28-Jun-03 6:10

Locked Ghost wrote:
Is it possible to call a C# DLL(or really any other way to use C#) from a C DLL?

Try my article: Creating a RCW for COM enabled non .NET applications[^]

Big Grin | :-D

-Nick Parker

Re: C DLL -> C# DLL possible?

S O S28-Jun-03 8:43

S O S

28-Jun-03 8:43

Thaank you

Re: C DLL -> C# DLL possible?

Nick Parker28-Jun-03 10:39

Nick Parker

28-Jun-03 10:39

Hope it helps.

-Nick Parker

Re: C DLL -> C# DLL possible?

jspano2-Jul-03 6:56

jspano

2-Jul-03 6:56

If you can use Managed C++ you don't even need COM.

config file for a class library

IsaacB27-Jun-03 5:55

IsaacB

27-Jun-03 5:55

Is there any way I can create the same file dependency that has an asp.net application but this time with a class library

What I'm trying to do is call from BizTalk the class library which has to locate a file that will parse, but it would be better if there wouldn't be the need of hard coding the path to the file that this class library will parse

And this parsing process will be repeated daily, so if the file to be parsed changes its location for some reason or the class library is moved to another computer, then I just have to change the configuration file instead of compiling again

With ASP.NET you can configure this with the web.config, with windows form or console apps with app.exe.config but can't find anything for class libraries

Thanks in advance
Isaac

Re: config file for a class library

Arjan Einbu28-Jun-03 11:39

Arjan Einbu

28-Jun-03 11:39

Place (and name) your config files, as the would belong to the exe-file that uses your class library. A class library doesn't have an association to a config file of its own.

Example:
if your class library is in c:\x\my_class_library.dll and it is beeing used by c:\y\some_executable.exe, then your .net will on behalf of your class library look in c:\y\some_executable.exe.config

Shortcut enum

Neil Lamka27-Jun-03 5:47

Neil Lamka

27-Jun-03 5:47

I would like to have a menu shortcut for Ctrl+Alt+F1 but don't find that combination in the Shortcut enum. Is there a way to create this shortcut string by ORing values or some other method that I have not found yet.

Thanks

Neil Lamka
neil@meetingworks.com

TabStops in ListBox

Roland Bär27-Jun-03 2:59

Roland Bär

27-Jun-03 2:59

How can I set the Tab-Stops in a ListBox to have all Items that are seperated with '\t' aligned. In C++/MFC (CListBox) it was with SetTabStops() but now in C#/.NET ???
I fount the Property 'UseTabStops' to enable/disable the using of the TabStops, but Nothing to set the distance between the TabStops.

Greets
Roland

Re: TabStops in ListBox

Rocky Moore27-Jun-03 23:15

Rocky Moore

27-Jun-03 23:15

You might find this handy:

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q318601[^]

Rocky Moore <><

Re: TabStops in ListBox

Roland Bär29-Jun-03 21:13

Roland Bär

29-Jun-03 21:13

Thank you for your Help, it works ... but unfortunately it works only for the ListBox but not for the CheckedListBox Frown | :(

I thougth, because the CheckedListBox derives from the ListBox, it should be for both the same, but it looks like i was wrong.

For me this looks like Microsoft has done their job only the half way ... Frown | :(

Roland

Re: TabStops in ListBox

Rocky Moore30-Jun-03 0:45

Rocky Moore

30-Jun-03 0:45

Roland Bär wrote:
For me this looks like Microsoft has done their job only the half way ...

It is .NET 1.0 or 1.1, not .NET 6.0! Smile | :)

Much better start on .NET than their first web browser Wink | ;)

Rocky Moore <><

Re: TabStops in ListBox

Roland Bär30-Jun-03 1:05

Roland Bär

30-Jun-03 1:05

You're right, let's wait for .NET 3.0 (don't trust even numbers Wink | ;)

).

I was only disapointed because it was the second time in my first .NET Project that I had to use a [DllImport...] Workaround to get functionality that was done in MFC (or even in VB I think) easy.

Roland

Re: TabStops in ListBox

Rocky Moore2-Jul-03 5:01

Rocky Moore

2-Jul-03 5:01

You know you can always build a class based on it and then override the painting to display the string as you wish. In .NET it is easy to extend classes! I have a entire set of controls (or most at least the ones I use all the time) wrapping the standard controls and then add in my own form style sheets to control the appearance and functionilty globally in the applications.

For an example, I can change color for read-only state, normal state, hover state. I am completely rebuilding a DatePicker control because I have not found one I like and have already rebuilt a checkbox that includes the text and checkbox within a box that has its background able to be set in any one of those three states.

In my current product, I wanted to keep all controls while browsing data in a read-only state and then when they hit a button to enable editing of the record, it will change the state and the appearanc of all the controls change without have those gray almost unreadable appearance of disabled controls.

All of this started when I got ticked because I could find no way to show the state of a tri-state checkbox when it was disabled.

Oh well, there I go rattling again. In short, it is easy to customize the output of controls so that you get the functionality you want.

Rocky Moore <><

declaring variables...

theJazzyBrain27-Jun-03 0:38

theJazzyBrain

27-Jun-03 0:38

Is there a way to declare a variable without specifying the type and specifying the type later?

I need to declare a connection object to the DB but Idont know if it is SqlClient or OleDbClient until later in the code..

Confused | :confused:

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| theJazzyBrain |
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Re: declaring variables...

Nathan Blomquist27-Jun-03 2:02

Nathan Blomquist

27-Jun-03 2:02

You could declare it as on object type and then do some casting later on, when you do decide what it is.

Or you can look to find their nearest common base type (which will always be object at some point at the top of the tree).

Hope this helps, but I couldn't find those types in the MSDN documentation, though I did find the SQLClient namespace.

-Nathan

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Hmmm... what's a signature?

Re: declaring variables...

theJazzyBrain27-Jun-03 2:32

theJazzyBrain

27-Jun-03 2:32

I thought of that as well,

<br />
private object objConnection;<br />

then you go

<br />
if (isSqlServer)<br />
objConnection = (SqlConnection)objConnection;<br />
else<br />
objConnection = (OleDbConnection)objConnection;<br />
<br />
objConnection.Open();<br />

But the compiler throws an error saing that the type object does not support he Open() method...

hmm...

Then I thought of having both Sql and OleDb connection objects in a Hashtable but again it wont work coz I have to cast them again into the right type in order to extract them from the Hashtable...

Hmmm...

Brain cells dont work well 2day... Confused | :confused:

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| theJazzyBrain |
|---------------|

Re: declaring variables...

Roland Bär27-Jun-03 3:03

Roland Bär

27-Jun-03 3:03

I think you have to Cast it each time you call a member of the Object:

<br />
if (isSqlServer)<br />
((SqlConnection)objConnection).Open();<br />
else<br />
((OleDbConnection)objConnection).Open();<br />
<br />

Hope that helps...

Roland

Re: declaring variables...

theJazzyBrain27-Jun-03 3:07

theJazzyBrain

27-Jun-03 3:07

I hand't thought of that....

Isn't that though too much overhead for the server?
I have no idea if casting is a heavy job or not...

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| theJazzyBrain |
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Re: declaring variables...

leppie27-Jun-03 7:19

leppie

27-Jun-03 7:19

theJazzyBrain wrote:
I have no idea if casting is a heavy job or not...

About 0.0025 ms per cast Poke tongue | ;-P

So no.

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: declaring variables...

Oleksandr Kucherenko27-Jun-03 2:58

Oleksandr Kucherenko

27-Jun-03 2:58

use interfaces!

Good Luck
Alex Kucherenko

Re: declaring variables...

theJazzyBrain27-Jun-03 3:04

theJazzyBrain

27-Jun-03 3:04

yeah I just came up with that IDbConnection inteface

or shall I just make an abstract class and then make a class for each DB Client?

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| theJazzyBrain |
|---------------|

Re: declaring variables...

Oleksandr Kucherenko27-Jun-03 3:15

Oleksandr Kucherenko

27-Jun-03 3:15

Only two question:
Is it realy needed to support Sql and OleDb clients at the same time?
You need both dataaccess methods in runtime?

I make my current project using only OleDb... And I can say that i have no performance looses. OleDb give you more kinds of storages that can be used by you.

So... if you still interesting in support of two data access methods then better write own short wrappers... later they can be easily grow to someting more complex.

Good Luck
Alex Kucherenko

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