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Bengt Skogvall wrote:

> hower I get a compiler error saying that x is not a variable or
> function.
> 
> How can I access x?

	You're trying to use nest as an instance property of Class, and it
isn't (or, at least, if it is you didn't post that portion of the
code). That code won't work in C#, either. What do you actually want to
do?

-- 
Craig Stuntz [TeamB] � Vertex Systems Corp. � Columbus, OH
  Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz

there was a small error in the code:

should be
public const string x = "hallo";

The code was not written by me, but I have to use it :-(

The idea is to supply constant strings. The way it should be called is

s := &Class.nest.x;

but that does not work with Delphi.NET either.

in C#, the Class compiles ok and I can get the value of x by calling

s = Class.nest.x;

-Bengt



Craig Stuntz [TeamB] wrote:
> Bengt Skogvall wrote:
> 
> 
>>hower I get a compiler error saying that x is not a variable or
>>function.
>>
>>How can I access x?
> 
> 
> 	You're trying to use nest as an instance property of Class, and it
> isn't (or, at least, if it is you didn't post that portion of the
> code). That code won't work in C#, either. What do you actually want to
> do?
> 

"Bengt Skogvall" <bengt@skogvall.de> wrote in message
news:425d54c8@newsgroups.borland.com...
> I have a C# assembly like this:
>
> public class Class
> {
> public Class()
> {
> }
>    public class nest
>    {
>   public string x = "hallo";
>    }
> }
>
>
> If I try to get the literal x from Delphi I write
>
> n:=&Class.create;
> s:=n.nest.x;
>
> hower I get a compiler error saying that x is not a variable or function.
>
> How can I access x?
>
> Regards,
> Bengt

try this:

n := &Class.nest.Create;
s := n.x;

> try this:
> 
> n := &Class.nest.Create;
> s := n.x;
> 
> 

Well, it compiles, but then you get a run time error saying "Field not 
found: nest.x.."

Bengt Skogvall wrote:

> Well, it compiles, but then you get a run time error saying "Field
> not found: nest.x.."

	Are you posting the actual code you are using here? Because that just
doesn't make sense.

-- 
Craig Stuntz [TeamB] � Vertex Systems Corp. � Columbus, OH
  Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz
Everything You Need to Know About InterBase Character Sets:
  http://blogs.teamb.com/craigstuntz/articles/403.aspx

> 	Are you posting the actual code you are using here? Because that just
> doesn't make sense.
> 

OK, here is the code I have:

	public abstract class _INSTRUMENT : FirebirdSqlEntity
	{
  // skipped the constructor and other methods

		public class ColumnNames
		{
             public const string INSTRUMENTNR = "INSTRUMENTNR";
             public const string BESCHREIBUNG = "BESCHREIBUNG";
                 }
        }

which is turned into a real class by

	public class INSTRUMENT : _INSTRUMENT
	{
		public INSTRUMENT()
		{
		
		}
         }

And I want to get to the strings. In C# I can do

    s = INSTRUMENT.ColumnNames.BESCHREIBUNG;

In Delphi, it shoud work IMO:

    s:=INSTRUMENT.ColumnNames.BESCHREIBUNG;

but it does not. :-(

-B

"Bengt Skogvall" <bengt@skogvall.de> wrote in message
news:425f6894$1@newsgroups.borland.com...
> > Are you posting the actual code you are using here? Because that just
> > doesn't make sense.
> >
>
> OK, here is the code I have:
>
> public abstract class _INSTRUMENT : FirebirdSqlEntity
> {
>   // skipped the constructor and other methods
>
> public class ColumnNames
> {
>              public const string INSTRUMENTNR = "INSTRUMENTNR";
>              public const string BESCHREIBUNG = "BESCHREIBUNG";
>                  }
>         }
>
> which is turned into a real class by
>
> public class INSTRUMENT : _INSTRUMENT
> {
> public INSTRUMENT()
> {
>
> }
>          }
>
> And I want to get to the strings. In C# I can do
>
>     s = INSTRUMENT.ColumnNames.BESCHREIBUNG;
>
> In Delphi, it shoud work IMO:
>
>     s:=INSTRUMENT.ColumnNames.BESCHREIBUNG;
>
> but it does not. :-(
>
> -B

I think there is something wrong with your definition in Delphi. How do you
define the interface part of class in Delphi?

> 
> I think there is something wrong with your definition in Delphi. How do you
> define the interface part of class in Delphi?
> 
> 
I am not sure I understand what you mean? I simply add a reference to 
the assembly where the c# class is. The rest (= Interface) is done 
automagically by Delphi.

-Bengt

"Bengt Skogvall" <bengt@skogvall.de> wrote in message
news:426047a1@newsgroups.borland.com...
> >
> > I think there is something wrong with your definition in Delphi. How do
you
> > define the interface part of class in Delphi?
> >
> >
> I am not sure I understand what you mean? I simply add a reference to
> the assembly where the c# class is. The rest (= Interface) is done
> automagically by Delphi.
>

Sorry, I thought you are going to translate it to delphi.

What is the error code when you compile & maybe run this:
s:=INSTRUMENT.ColumnNames.BESCHREIBUNG

> Sorry, I thought you are going to translate it to delphi.

No Problem :-)

> 
> What is the error code when you compile & maybe run this:
> s:=INSTRUMENT.ColumnNames.BESCHREIBUNG
> 

Translated form German:

"Unknown indentifier" (marking BESCHREIBUNG) already at Compile time :-(

Bengt Skogvall wrote:

> And I want to get to the strings. In C# I can do
> 
>     s = INSTRUMENT.ColumnNames.BESCHREIBUNG;

	OK, that makes *a lot* more sense. Your original Delphi code was quite
misleading because you were using an *instance* of what is, in this
example, INSTRUMENT rather than the class itself as you do above.

> In Delphi, it shoud work IMO:
> 
>     s:=INSTRUMENT.ColumnNames.BESCHREIBUNG;

	And indeed, this works just fine for me. Code Completion doesn't find
it, but the project compiles and runs.

	Sample projects included below:

using System;

namespace CSharpLib
{
	public abstract class _INSTRUMENT : System.Object
	{
		public class ColumnNames
		{
			 public const string INSTRUMENTNR = "INSTRUMENTNR";
			 public const string BESCHREIBUNG = "BESCHREIBUNG";
				 }
		}

	public class INSTRUMENT : _INSTRUMENT
	{
		public INSTRUMENT(): base(){}
	}
}

program Project4;

{$APPTYPE CONSOLE}

{%DelphiDotNetAssemblyCompiler 'CSharpLib\bin\Debug\CSharpLib.dll'}

uses
  SysUtils, CSharpLib;

var
  S: String;

begin
  S := INSTRUMENT.ColumnNames.INSTRUMENTNR;
  WriteLn(S);
  S := INSTRUMENT.ColumnNames.BESCHREIBUNG;
  WriteLn(S);
  ReadLn;
end.

-- 
Craig Stuntz [TeamB] � Vertex Systems Corp. � Columbus, OH
  Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz
Please read and follow Borland's rules for the user of their 
  news server: http://info.borland.com/newsgroups/guide.html

Indeed, it works. Thanks a lot! :-)

I have learnt a lot about c# and Delphi.NET and how they interoperate. 
My mistake was really that I thought I should be able to access the 
string values using the instaciated class instead of the class itself.

However, there is still one thing that is not clear to me: The strings 
get truncated.

Look at the output:

INSTRU
BESCHR

How can I get the rest of the strings?

-Bengt


Craig Stuntz [TeamB] wrote:
> Bengt Skogvall wrote:
> 
> 
>>And I want to get to the strings. In C# I can do
>>
>>    s = INSTRUMENT.ColumnNames.BESCHREIBUNG;
> 
> 
> 	OK, that makes *a lot* more sense. Your original Delphi code was quite
> misleading because you were using an *instance* of what is, in this
> example, INSTRUMENT rather than the class itself as you do above.
> 
> 
>>In Delphi, it shoud work IMO:
>>
>>    s:=INSTRUMENT.ColumnNames.BESCHREIBUNG;
> 
> 
> 	And indeed, this works just fine for me. Code Completion doesn't find
> it, but the project compiles and runs.
> 
> 	Sample projects included below:
> 
> using System;
> 
> namespace CSharpLib
> {
> 	public abstract class _INSTRUMENT : System.Object
> 	{
> 		public class ColumnNames
> 		{
> 			 public const string INSTRUMENTNR = "INSTRUMENTNR";
> 			 public const string BESCHREIBUNG = "BESCHREIBUNG";
> 				 }
> 		}
> 
> 	public class INSTRUMENT : _INSTRUMENT
> 	{
> 		public INSTRUMENT(): base(){}
> 	}
> }
> 
> program Project4;
> 
> {$APPTYPE CONSOLE}
> 
> {%DelphiDotNetAssemblyCompiler 'CSharpLib\bin\Debug\CSharpLib.dll'}
> 
> uses
>   SysUtils, CSharpLib;
> 
> var
>   S: String;
> 
> begin
>   S := INSTRUMENT.ColumnNames.INSTRUMENTNR;
>   WriteLn(S);
>   S := INSTRUMENT.ColumnNames.BESCHREIBUNG;
>   WriteLn(S);
>   ReadLn;
> end.
> 

> Look at the output:
> 
> INSTRU
> BESCHR
> 
> How can I get the rest of the strings?
> 

Actually, it turns out I get only half the length of any given string!

Bengt Skogvall wrote:

> I have learnt a lot about c# and Delphi.NET and how they
> interoperate. My mistake was really that I thought I should be able
> to access the string values using the instaciated class instead of
> the class itself.

	Delphi for .NET and C# work identically in this respect; there is a
clear separation between types and instances.
 
> However, there is still one thing that is not clear to me: The
> strings get truncated.
> 
> Look at the output:
> 
> INSTRU
> BESCHR

	I'm seeing that, too. I'm not sure what is causing it. When I browse
the compiled C# assembly in Reflector I see the full string, so the
problem is on the Delphi end.
> 
> How can I get the rest of the strings?



-- 
Craig Stuntz [TeamB] � Vertex Systems Corp. � Columbus, OH
  Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz
Please read and follow Borland's rules for the user of their 
  news server: http://info.borland.com/newsgroups/guide.html