Re: [IronPython] Reflection.Emit from IronPython: What is the equivalent of typeof() in C# ?

2009-08-07 Thread Robert Smallshire 
Hello,

Here is the solution to my problem, which turns out to be as much a silly
mistake on my part as to how to use the Reflection.Emit API, as it is an
IronPython conundrum.

It turns out the array type for the field, that I was seeing in Reflector
and IL Disassembler was is set by the DefineField call (of course!), rather
than the Emit(Newarr, type) call which simply puts a reference to the new
array on the stack.  The original how-to-do-typeof question still applies,
since this method also takes a type parameter:

Now I've made the change in the right place in my code, I can report that
the following is known to work, a gives a String[] as you would expect in
the generated assembly:

type_builder.DefineField(foo,
System.Type.GetType('System.String').MakeArrayType(1),
FieldAttribute.Private)

For the record, the following expressions supplied by me and others also
work:

str().GetType().MakeArrayType(1)
System.String().GetType().MakeArrayType(1)
clr.GetClrType(System.String).MakeArrayType(1)
clr.GetClrType(type('')).MakeArrayType(1)

Thank you to everybody for your correct answers, now I've figured out how to
use them, and apologies for any confusion I may have caused by prematurely
rejecting your answers before I'd got my act together.  It seems there are
many equivalents of C# typeof in IronPython.

Thanks,

Rob

 -Original Message-
 From: users-boun...@lists.ironpython.com 
 [mailto:users-boun...@lists.ironpython.com] On Behalf Of 
 Robert Smallshire
 Sent: 06 August 2009 22:05
 To: 'Discussion of IronPython'
 Subject: [IronPython] Reflection.Emit from IronPython: What 
 is theequivalent of typeof() in C# ?
 
 
 Hello,
 
 I'm attempting to drive the Reflection.Emit API from 
 IronPython. In C# typical Reflection.Emit use makes use 
 typeof(...) facility in C#, to enable the determination of 
 types without needing an instance of that type.
 
 For example, to create an array of .NET CTS Strings in IL 
 from C# one might
 do:
 
 generator.Emit(OpCodes.Newarr, typeof(string));
 
 where the second argument to Emit is the element type of the array.
 
 I've tried various alternatives from IronPython, including
 
 generator.Emit(OpCodes.Newarr, System.Type.GetType('System.String'))
 generator.Emit(OpCodes.Newarr, str().GetType()) 
 generator.Emit(OpCodes.Newarr, System.String().GetType()) 
 generator.Emit(OpCodes.Newarr, clr.GetClrType(System.String))
 
 however, all of these result in RuntimeType[] rather than 
 String[] in the generated CIL.
 
 How do I get typeof(System.String) from IronPython?
 
 Rob
 
 Robert Smallshire
 rob...@smallshire.org.uk
 http://smallshire.org.uk/
 Currently in Norway (UTC +2 hours) 
 
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[IronPython] Reflection.Emit from IronPython: What is the equivalent of typeof() in C# ?

2009-08-06 Thread Robert Smallshire 
Hello,

I'm attempting to drive the Reflection.Emit API from IronPython. In C#
typical Reflection.Emit use makes use typeof(...) facility in C#, to enable
the determination of types without needing an instance of that type.

For example, to create an array of .NET CTS Strings in IL from C# one might
do:

generator.Emit(OpCodes.Newarr, typeof(string));

where the second argument to Emit is the element type of the array.

I've tried various alternatives from IronPython, including

generator.Emit(OpCodes.Newarr, System.Type.GetType('System.String'))
generator.Emit(OpCodes.Newarr, str().GetType())
generator.Emit(OpCodes.Newarr, System.String().GetType())
generator.Emit(OpCodes.Newarr, clr.GetClrType(System.String))

however, all of these result in RuntimeType[] rather than String[] in the
generated CIL.

How do I get typeof(System.String) from IronPython?

Rob

Robert Smallshire
rob...@smallshire.org.uk
http://smallshire.org.uk/
Currently in Norway (UTC +2 hours) 

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Re: [IronPython] Reflection.Emit from IronPython: What is the equivalent of typeof() in C# ?

2009-08-06 Thread Michael Foord 

clr.GetClrType('') ? (on an instance of a string)

Michael

Robert Smallshire wrote:

Hello,

I'm attempting to drive the Reflection.Emit API from IronPython. In C#
typical Reflection.Emit use makes use typeof(...) facility in C#, to enable
the determination of types without needing an instance of that type.

For example, to create an array of .NET CTS Strings in IL from C# one might
do:

generator.Emit(OpCodes.Newarr, typeof(string));

where the second argument to Emit is the element type of the array.

I've tried various alternatives from IronPython, including

generator.Emit(OpCodes.Newarr, System.Type.GetType('System.String'))
generator.Emit(OpCodes.Newarr, str().GetType())
generator.Emit(OpCodes.Newarr, System.String().GetType())
generator.Emit(OpCodes.Newarr, clr.GetClrType(System.String))

however, all of these result in RuntimeType[] rather than String[] in the
generated CIL.

How do I get typeof(System.String) from IronPython?

Rob

Robert Smallshire
rob...@smallshire.org.uk
http://smallshire.org.uk/
Currently in Norway (UTC +2 hours) 


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Re: [IronPython] Reflection.Emit from IronPython: What is the equivalent of typeof() in C# ?

2009-08-06 Thread Robert Smallshire 
Hi Michael,

I'm afraid not:

 clr.GetClrType('')
TypeError: expected Type, got str

My hopes were momentarily raised when I discovered that your otherwise very
comprehensive book mentions typeof in the index (page 398) - but then I
found that you only use it from C#. 

Cheers,

Rob


 clr.GetClrType('') ? (on an instance of a string)
 
 Michael
 
 Robert Smallshire wrote:
  Hello,
 
  I'm attempting to drive the Reflection.Emit API from 
 IronPython. In C# 
  typical Reflection.Emit use makes use typeof(...) facility 
 in C#, to 
  enable the determination of types without needing an 
 instance of that 
  type.
 
  For example, to create an array of .NET CTS Strings in IL 
 from C# one 
  might
  do:
 
  generator.Emit(OpCodes.Newarr, typeof(string));
 
  where the second argument to Emit is the element type of the array.
 
  I've tried various alternatives from IronPython, including
 
  generator.Emit(OpCodes.Newarr, System.Type.GetType('System.String'))
  generator.Emit(OpCodes.Newarr, str().GetType()) 
  generator.Emit(OpCodes.Newarr, System.String().GetType()) 
  generator.Emit(OpCodes.Newarr, clr.GetClrType(System.String))
 
  however, all of these result in RuntimeType[] rather than 
 String[] in 
  the generated CIL.
 
  How do I get typeof(System.String) from IronPython?
 
  Rob
 
  Robert Smallshire
  rob...@smallshire.org.uk
  http://smallshire.org.uk/
  Currently in Norway (UTC +2 hours)
 
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 http://www.ironpythoninaction.com/
 http://www.voidspace.org.uk/blog
 
 

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Re: [IronPython] Reflection.Emit from IronPython: What is the equivalent of typeof() in C# ?

2009-08-06 Thread Dave Fugate 
Try:
clr.GetClrType(type(''))


David Fugate
Microsoft - IronPython
http://knowbody.livejournal.com

-Original Message-
From: users-boun...@lists.ironpython.com 
[mailto:users-boun...@lists.ironpython.com] On Behalf Of Robert Smallshire
Sent: Thursday, August 06, 2009 1:53 PM
To: 'Michael Foord'; 'Discussion of IronPython'
Subject: Re: [IronPython] Reflection.Emit from IronPython: What is the 
equivalent of typeof() in C# ?

Hi Michael,

I'm afraid not:

 clr.GetClrType('')
TypeError: expected Type, got str

My hopes were momentarily raised when I discovered that your otherwise very
comprehensive book mentions typeof in the index (page 398) - but then I
found that you only use it from C#.

Cheers,

Rob


 clr.GetClrType('') ? (on an instance of a string)

 Michael

 Robert Smallshire wrote:
  Hello,
 
  I'm attempting to drive the Reflection.Emit API from
 IronPython. In C#
  typical Reflection.Emit use makes use typeof(...) facility
 in C#, to
  enable the determination of types without needing an
 instance of that
  type.
 
  For example, to create an array of .NET CTS Strings in IL
 from C# one
  might
  do:
 
  generator.Emit(OpCodes.Newarr, typeof(string));
 
  where the second argument to Emit is the element type of the array.
 
  I've tried various alternatives from IronPython, including
 
  generator.Emit(OpCodes.Newarr, System.Type.GetType('System.String'))
  generator.Emit(OpCodes.Newarr, str().GetType())
  generator.Emit(OpCodes.Newarr, System.String().GetType())
  generator.Emit(OpCodes.Newarr, clr.GetClrType(System.String))
 
  however, all of these result in RuntimeType[] rather than
 String[] in
  the generated CIL.
 
  How do I get typeof(System.String) from IronPython?
 
  Rob
 
  Robert Smallshire
  rob...@smallshire.org.uk
  http://smallshire.org.uk/
  Currently in Norway (UTC +2 hours)
 
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Re: [IronPython] Reflection.Emit from IronPython: What is the equivalent of typeof() in C# ?

2009-08-06 Thread Shri Borde 
You can also just use the type like System.String to avoid having to create 
an instance of the type.

 import System
 import clr
 clr.GetClrType(System.String)
System.RuntimeType object at 0x002B [System.String]

-Original Message-
From: users-boun...@lists.ironpython.com 
[mailto:users-boun...@lists.ironpython.com] On Behalf Of Dave Fugate
Sent: Thursday, August 06, 2009 2:07 PM
To: rob...@smallshire.org.uk; Discussion of IronPython; 'Michael Foord'
Subject: Re: [IronPython] Reflection.Emit from IronPython: What is the 
equivalent of typeof() in C# ?

Try:
clr.GetClrType(type(''))


David Fugate
Microsoft - IronPython
http://knowbody.livejournal.com

-Original Message-
From: users-boun...@lists.ironpython.com 
[mailto:users-boun...@lists.ironpython.com] On Behalf Of Robert Smallshire
Sent: Thursday, August 06, 2009 1:53 PM
To: 'Michael Foord'; 'Discussion of IronPython'
Subject: Re: [IronPython] Reflection.Emit from IronPython: What is the 
equivalent of typeof() in C# ?

Hi Michael,

I'm afraid not:

 clr.GetClrType('')
TypeError: expected Type, got str

My hopes were momentarily raised when I discovered that your otherwise very
comprehensive book mentions typeof in the index (page 398) - but then I
found that you only use it from C#.

Cheers,

Rob


 clr.GetClrType('') ? (on an instance of a string)

 Michael

 Robert Smallshire wrote:
  Hello,
 
  I'm attempting to drive the Reflection.Emit API from
 IronPython. In C#
  typical Reflection.Emit use makes use typeof(...) facility
 in C#, to
  enable the determination of types without needing an
 instance of that
  type.
 
  For example, to create an array of .NET CTS Strings in IL
 from C# one
  might
  do:
 
  generator.Emit(OpCodes.Newarr, typeof(string));
 
  where the second argument to Emit is the element type of the array.
 
  I've tried various alternatives from IronPython, including
 
  generator.Emit(OpCodes.Newarr, System.Type.GetType('System.String'))
  generator.Emit(OpCodes.Newarr, str().GetType())
  generator.Emit(OpCodes.Newarr, System.String().GetType())
  generator.Emit(OpCodes.Newarr, clr.GetClrType(System.String))
 
  however, all of these result in RuntimeType[] rather than
 String[] in
  the generated CIL.
 
  How do I get typeof(System.String) from IronPython?
 
  Rob
 
  Robert Smallshire
  rob...@smallshire.org.uk
  http://smallshire.org.uk/
  Currently in Norway (UTC +2 hours)
 
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