Need help with manipulating cd drive. - C# Discussion Boards

4-Jun-04 3:59

Just look at the class name: table mappings. If you look at the documentation, it maps a source table name to a destination table name, so that if the table name in the result set the DataAdapter gets is different from what you want it to be in a configured DataSet, it will map it.

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Xml seriliazation query

avneeshb3-Jun-04 6:03

avneeshb

3-Jun-04 6:03

Hi!

I am trying to use XmlSerialization in the following scenario:

1. I have a class called Test:
public class Test
{
private int someAttribute;
[XmlAttribute]
public int Att
{
get
{
return someAttribute;
}
set
{
someAttribute=value;
}
}
}

2. And a subclass:
public class SubTest
{
public string something;
}
Upon serilialization, I get the following:

<Test Att="int" />
<SubTest>
<something>string</something>
</SubTest>

As can be seen the attribute Att is not visible in the subclass. Using virtual (for the property) and overriding it, or just hiding it with 'new' also did not help. Creating a new attribute with the same name (i.e. marking it as [XmlAttribute("Att")] also creates an error. Any suggestion as to how I can have an attribute of the same name in the subclass also?

Thanks!

Heath Stewart3-Jun-04 6:17

3-Jun-04 6:17

I see no subclasses. SubTest does not extend Test, i.e. you must code it as SubText : Test.

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avneeshb3-Jun-04 6:43

avneeshb

3-Jun-04 6:43

thats what happens when you don't copy and paste Smile | :)

In my actual code Subtest extends test

so:

public class SubTest:Test
{
public string something;
}

Thanks!

Heath Stewart3-Jun-04 6:51

3-Jun-04 6:51

When you create your XmlSerializer instance, make sure you create it using either your instance of SubTest or the type of SubTest (using typeof(SubTest)). The following sample works just fine:

using System;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

public class Test
{
  static void Main()
  {
    SubTest test = new SubTest();

    XmlTextWriter writer = new XmlTextWriter("Test.xml", Encoding.UTF8);
    XmlSerializer serializer = new XmlSerializer(typeof(SubTest));
    serializer.Serialize(writer, test);
  }

  [XmlAttribute]
  public int Attr
  {
    get { return 1; }
    set { ; }
  }
}

public class SubTest : Test
{
  public string Something = "Test";
}

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Need help with manipulating cd drive.

avneeshb3-Jun-04 8:48

avneeshb

3-Jun-04 8:48

Thanks!

I was actually trying to do this as part of creating a webservice, and apologies for not making this more specific.

I have a webmethod which looks something like:
MyWebMethod(SubTest sub){
somestuff;
}
When I create the webservice and look at the soap message that would be sent, I don't see the attribute there (i.e. the string looks like <sub> string </sub> instead of <sub att=int> string </sub>. I guess the default xmlserializer does not pick the derived attribute. Is there anyway of informing the serializer in the context of writing a webservice?

Thanks!

Admiral Ackbar3-Jun-04 6:01

Admiral Ackbar

3-Jun-04 6:01

I'm new to C#, just started building my first few applications. I wanted to build a really simple program for manipulating my cd/dvd drive. I want to have a Play, a stop, and an eject button.

I was thinking of followign this tutorial CD Player library using MCI

Unfortunately, I've run into my first problem. I can't seem to find DeviceController.dll. I'm using the free C# IDE by Borland, and on my listing of references, this doesn't appear. A friend suggest that I make sure I have the Platform SDK installed, but after installing that and rebotting, the .dll still was not available.

Is there a newer .dll or another way of doing this in high level? Or am I stuck until I find this .dll?

Heath Stewart3-Jun-04 6:14

3-Jun-04 6:14

DeviceController.dll is already compiled in the Demo Application ZIP file, and you can compile it from the source. Both links are at the top of the article (typical for articles on CodeProject). Extract that DLL to some directory on your hard drive and add a reference to that DLL (assembly) to your project. Just click the Browse button and browse to the directory where you extracted it.

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Dave Kreskowiak3-Jun-04 6:15

3-Jun-04 6:15

You didn't download the source files for that article, did you? You'll find the DeviceController.dll that you're looking for in the source files .Zip file. It's not a standard .DLL you'll find on any Windows machine. It was custom written by the author of the article.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Admiral Ackbar3-Jun-04 7:01

Admiral Ackbar

3-Jun-04 7:01

Oh. I didn't download it because I thought it was a standard DLL. I didn't realize it was custom written. I downloaded it and browsed through it, but wanted to do this on my own from scratch. I guess I'll have to develop my own dll too. Thanks.

Dave Kreskowiak3-Jun-04 7:20

3-Jun-04 7:20

The source for the .DLL is in there too if you want to take a look to see how it's done...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

String formatting question

Admiral Ackbar3-Jun-04 8:46

Admiral Ackbar

3-Jun-04 8:46

Sweet. My goal was to do this on my own though. I've looked at the MCI Interface at MSDN. It's a little above my level, but they show how to set up a wave file for playback. Maybe I'll start with that. Then look over the .dll source and see if how that works.

BrcKcc3-Jun-04 5:47

BrcKcc

3-Jun-04 5:47

I want to format a string with embedded backslashes. The string that I want is as follows:

This is John I\. Smith.

Here's the code snippet:

string temp1 = "John I\\. Smith";
string temp2 = String.Format("This is {0}.", temp);

What I get in temp2 is:
This is John I\\. Smith.

instead of
This is John I\. Smith.

How do I get rid of the extra backslash?

BRCKCC

Re: String formatting question

Andy *M*3-Jun-04 5:52

Re: String formatting question

3-Jun-04 5:52

BrcKcc wrote:
This is John I\\. Smith.

Is that in the debugger, or in actual application output??

One easy way to be sure is to use
string myString = @"Use\a\slash\only\once";

the @ symbol in front of the string literal tells the compiler not to interpret the slashes as escape sequences. If you do want to include an escape sequence this won't work for you.

Cheers,
Andy.

BrcKcc3-Jun-04 6:22

BrcKcc

3-Jun-04 6:22

It was in the debugger. It turns out when I displayed the string via MessageBox.Show(), it only had one backslash. So thanks for that clarification. The @ symbol has been confusing. How do I convert a string defined with the @ symbol to a string without the @ symbol? Do you know where Microsoft documented this capability?

Thanks.
- Bruce

BRCKCC

Re: String formatting question

Andy *M*3-Jun-04 6:28

3-Jun-04 6:28

BrcKcc wrote:
How do I convert a string defined with the @ symbol to a string without the @ symbol?

What do you mean? They are all the same thing: a string object.

string a = "String\\Literal";
string b = @"String\Literal";
a==b

[EDIT - sorry, I had the slashes the wrong way round before]

Cheers,
Andy

Sharing a config file

Andy *M*3-Jun-04 5:22

3-Jun-04 5:22

Hi,

I have a web application and a windows service written in C# and I want to share the config file between the two. At the moment it looks like I would have to copy them each time I make an update. I would rather not do this.

Any ideas of how I may achieve this?

Cheers,
Andy.

Dave Kreskowiak3-Jun-04 5:55

3-Jun-04 5:55

AFAIK, you will have to do this. Unless, of course, you launch both the WebService and your Windows app out of the same directory (not likely...)

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Heath Stewart3-Jun-04 6:07

3-Jun-04 6:07

That wouldn't work, either. ASP.NET uses Web.config and applications (using the loader information in the PE/COFF executable that mscoree.dll uses) use <appname>.exe.config.

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Dave Kreskowiak3-Jun-04 6:11

3-Jun-04 6:11

Smack! That's right! Ouch... Now I need some Advil.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Andy *M*3-Jun-04 6:12

3-Jun-04 6:12

I've found an attribute on appSettings called file which can point to another file and I was hoping to use that as an alternative, but I can't seem to get that to work either. I just don't see where I am going wrong.

In the web.config I've got:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings file="general.config"/>
...
</configuration>

And in the general.config I've got

<?xml version="1.0" encoding="utf-8" ?>
<appSettings>
	<add key="encryption_level" value="2"/>
	<add key="timer_interval" value="60" />
</appSettings>

But, in my tester application which just writes out the app settings it returns no information. If the appSettings section is copied into the web.config file it works as expected.

Confused | :confused:

Colin Angus Mackay4-Jun-04 9:37

Colin Angus Mackay

4-Jun-04 9:37

Try using an absolute path rather than a relative path. e.g.

<br />
<appSettings file="C:\inetpub\wwwroot\MyWebApp\general.config"/><br />

Does this help?

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The Second EuroCPian Event will be in Brussels on the 4th of September

Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

Heath Stewart3-Jun-04 6:10

3-Jun-04 6:10

As Dave said, that really isn't possible.

There is one way, though it's a pretty big hack and won't really solve your problem. You can create a launcher with it's own config file that specifies the path of the executable (optional) and the path to the .config file. This launcher is executable as normal but then grabs the path to your current Windows Service executable (or hard-code it, though I recommend against that), sets up a second AppDomain (see AppDomain.CreateDomain) and sets the AppDomain.SetupInformation.ConfigurationFile using the path you configured.

This isn't recommended, though. Those .config files are separate for security reasons and because a true application boundary exists (they're obviously both separate executables). Also, A Windows Service and an ASP.NET web application really share very little of the .config in common, such as the appSettings and assemblyBinding (as well as other runtime sections).

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Andy *M*3-Jun-04 6:25