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Today's Topics:
1. lazy IO by example (Tim Baumgartner)
2. Re: gtk2hs [GIMP ToolKit] (Tim Baumgartner)
3. Re: gtk2hs [GIMP ToolKit] (Patrick Lynch)
4. Re: gtk2hs [GIMP ToolKit] (Patrick Lynch)
----------------------------------------------------------------------
Message: 1
Date: Fri, 4 Feb 2011 13:29:49 +0100
From: Tim Baumgartner <[email protected]>
Subject: [Haskell-beginners] lazy IO by example
To: [email protected]
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hi community,
In the following code, the main function only wants to print the first
5 numbers of a huge list. But since the computation is not lazy, this
doesn't work in a satisfactory way.
content :: Int -> IO [Int]
content i = do
fs <- files i
ds <- directories i
fss <- mapM content ds
return $ fs ++ concat fss
files i = return [1..i]
directories i = return [1..i-1]
main = content 1000000 >>= print . take 5
Now I'd like to know if it's possible to make this "IO" lazy, using
unsafeInterleaveIO. I tried to do it, failed. Perhaps someone can
help.
I guess another weakness of this code is the bad performance of "dfs
++ concat fss", but currently I don't care about that.
Thanks for any help
Tim
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Message: 2
Date: Fri, 4 Feb 2011 20:13:56 +0100
From: Tim Baumgartner <[email protected]>
Subject: Re: [Haskell-beginners] gtk2hs [GIMP ToolKit]
To: [email protected]
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hi Patrick,
I used the same link to install gtk2hs on Windows XP with Haskell Platform
2010.2.0 about 3 days ago. I'm a beginner as well. I had a number of
problems. In the end, I managed to install version 0.11 with some
extra-work:
- I added HaskellPlatform/2010.2.0.0/mingw/bin to the PATH (because there is
my only current gcc.exe)
- ugly: I copied Gtk+/include/glib-2.0 to a temp folder and copied this
again *into* Gtk+/include/glib-2.0 (the output of pkg-config looked
alright...)
- I repeated the previous steps for other include folders as well
Note: in order to install a specific version of a package you can e.g.
cabal install gtk2hs-buildtools-0.11.2
Installation of 0.12. failed with the following error:
[ 5 of 24] Compiling System.GIO.Volumes.VolumeMonitor (
dist\build\System\GIO\Volumes\VolumeMonitor.hs,
dist\build\System\GIO\Volumes\VolumeMonitor.o )
System\GIO\Volumes\VolumeMonitor.chs:56:4:
Not in scope: `vmDriveStopButton'
Regards,
Tim
2011/2/3 Patrick Lynch <[email protected]>
> ...I'm going to try to install gtk2hs again...
> ...I'll be using the link http://www.haskell.org/haskellwiki/Gtk2Hs
> ...I'd appreciate any help...
>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://www.haskell.org/mailman/listinfo/beginners
>
>
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Message: 3
Date: Fri, 04 Feb 2011 14:23:47 -0500
From: "Patrick Lynch" <[email protected]>
Subject: Re: [Haskell-beginners] gtk2hs [GIMP ToolKit]
To: "Tim Baumgartner" <[email protected]>,
<[email protected]>
Message-ID: <617561482BAB4DB5AEA8AD169446C0A2@UserPC>
Content-Type: text/plain; charset="iso-8859-1"
Good moring,
...I know how hard it is...
...this will be my second attempt on a Windows Vista PC...I also have to
install it on a Mac...
...I'll try it again this afternoon...
Good luck to both of us
It really shouldn't be this hard...bummer...
----- Original Message -----
From: Tim Baumgartner
To: [email protected]
Cc: Patrick Lynch
Sent: Friday, February 04, 2011 2:13 PM
Subject: Re: [Haskell-beginners] gtk2hs [GIMP ToolKit]
Hi Patrick,
I used the same link to install gtk2hs on Windows XP with Haskell Platform
2010.2.0 about 3 days ago. I'm a beginner as well. I had a number of problems.
In the end, I managed to install version 0.11 with some extra-work:
- I added HaskellPlatform/2010.2.0.0/mingw/bin to the PATH (because there is
my only current gcc.exe)
- ugly: I copied Gtk+/include/glib-2.0 to a temp folder and copied this again
*into* Gtk+/include/glib-2.0 (the output of pkg-config looked alright...)
- I repeated the previous steps for other include folders as well
Note: in order to install a specific version of a package you can e.g.
cabal install gtk2hs-buildtools-0.11.2
Installation of 0.12. failed with the following error:
[ 5 of 24] Compiling System.GIO.Volumes.VolumeMonitor (
dist\build\System\GIO\Volumes\VolumeMonitor.hs,
dist\build\System\GIO\Volumes\VolumeMonitor.o )
System\GIO\Volumes\VolumeMonitor.chs:56:4:
Not in scope: `vmDriveStopButton'
Regards,
Tim
2011/2/3 Patrick Lynch <[email protected]>
...I'm going to try to install gtk2hs again...
...I'll be using the link http://www.haskell.org/haskellwiki/Gtk2Hs
...I'd appreciate any help...
_______________________________________________
Beginners mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/beginners
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------------------------------
Message: 4
Date: Fri, 04 Feb 2011 18:01:34 -0500
From: "Patrick Lynch" <[email protected]>
Subject: Re: [Haskell-beginners] gtk2hs [GIMP ToolKit]
To: "Tim Baumgartner" <[email protected]>,
<[email protected]>
Message-ID: <8390151C5E96413981B88847C61DA29F@UserPC>
Content-Type: text/plain; charset="iso-8859-1"
...i'm running into the same problem...
...i ran the command: cabal install gtk...
...it can't find the folders: Z, CAIRO, GOBJECT-2.0, GLIB-2.0, INTL.
...however, they are all, with the exception of Z and possibly GOBJECT-2.0 -
there is no folder for this but there is a library file for it, in Program
Files and surprisingly also in Program Files (X86)...
...i'm a bit confused about my %PATH% setting, it is different in the Advanced
system settings from what is displayed by echo %PATH% in the Command window -
see following...
C:\Users\User>cabal install gtk
Resolving dependencies...
C:\Users\User\AppData\Local\Temp\cairo-0.12.02164\cairo-0.12.0\Gtk2HsSetup.hs:25:
warning: #warning Setup.hs is guessing the version of Cabal. If compilation of
Se
tup.hs fails use -DCABAL_VERSION_MINOR=x for Cabal version 1.x.0 when building
(prefixed by --ghc-option= when using the 'cabal' command)
[1 of 2] Compiling Gtk2HsSetup (
C:\Users\User\AppData\Local\Temp\cairo-0.12.02164\cairo-0.12.0\Gtk2HsSetup.hs,
C:\Users\User\AppData\Local\Temp\cairo-0.12.02
164\cairo-0.12.0\dist\setup\Gtk2HsSetup.o )
[2 of 2] Compiling Main (
C:\Users\User\AppData\Local\Temp\cairo-0.12.02164\cairo-0.12.0\Setup.hs,
C:\Users\User\AppData\Local\Temp\cairo-0.12.02164\ca
iro-0.12.0\dist\setup\Main.o )
Linking
C:\Users\User\AppData\Local\Temp\cairo-0.12.02164\cairo-0.12.0\dist\setup\setup.exe
...
Configuring cairo-0.12.0...
setup.exe: Missing dependencies on foreign libraries:
* Missing C libraries: z, cairo
This problem can usually be solved by installing the system packages that
provide these libraries (you may need the "-dev" versions). If the libraries
are already installed but in a non-standard location then you can use the
flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.
C:\Users\User\AppData\Local\Temp\glib-0.12.02164\glib-0.12.0\Gtk2HsSetup.hs:25:
warning: #warning Setup.hs is guessing the version of Cabal. If compilation of
Setu
p.hs fails use -DCABAL_VERSION_MINOR=x for Cabal version 1.x.0 when building
(prefixed by --ghc-option= when using the 'cabal' command)
[1 of 2] Compiling Gtk2HsSetup (
C:\Users\User\AppData\Local\Temp\glib-0.12.02164\glib-0.12.0\Gtk2HsSetup.hs,
C:\Users\User\AppData\Local\Temp\glib-0.12.02164
\glib-0.12.0\dist\setup\Gtk2HsSetup.o )
[2 of 2] Compiling Main (
C:\Users\User\AppData\Local\Temp\glib-0.12.02164\glib-0.12.0\Setup.hs,
C:\Users\User\AppData\Local\Temp\glib-0.12.02164\glib-
0.12.0\dist\setup\Main.o )
Linking
C:\Users\User\AppData\Local\Temp\glib-0.12.02164\glib-0.12.0\dist\setup\setup.exe
...
Configuring glib-0.12.0...
setup.exe: Missing dependencies on foreign libraries:
* Missing C libraries: gobject-2.0, glib-2.0, intl
This problem can usually be solved by installing the system packages that
provide these libraries (you may need the "-dev" versions). If the libraries
are already installed but in a non-standard location then you can use the
flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.
cabal: Error: some packages failed to install:
cairo-0.12.0 failed during the configure step. The exception was:
ExitFailure 1
gio-0.12.0 depends on glib-0.12.0 which failed to install.
glib-0.12.0 failed during the configure step. The exception was:
ExitFailure 1
gtk-0.12.0 depends on glib-0.12.0 which failed to install.
pango-0.12.0 depends on glib-0.12.0 which failed to install.
C:\Users\User>
---------------------------------------------------------------------------
--My %PATH% at the command window
C:\Program Files (x86)\Haskell\bin;
C:\Program Files (x86)\Haskell Platform\2010.2.0.0\lib\extralibs\bin;
C:\Program Files (x86)\Haskell Platform\2010.2.0.0\bin;
C:\Windows\system32;
C:\Windows;C:\Windows\System32\Wbem;
C:\Program Files (x86)\Common Files\Roxio Shared\DLLShared\;
C:\Program Files (x86)\Common Files\Roxio Shared\10.0\DLLShared\;
C:\Users\User\AppData\Roaming\cabal\bin;C:\Program Files\Gtk+\bin;
C:\Users\User;C:\Program Files (x86)\Gtk+\bin;
c:\Program Files (x86)\Gtk+\share\gettext
--My %PATH% at the Advanced system settings
C:\Users\User\AppData\Roaming\cabal\bin;
C:\Program Files\Gtk+\bin;
C:\Users\User;
C:\Program Files (x86)\Gtk+\bin;
c:\Program Files (x86)\Gtk+\share\gettext
----------------------------------------------------------------------------
.To the PKG_CONFIG_PATH environment variable add the 'pkgconfig' directory. The
default path should be "
C:\Program Files\Gtk+\lib\pkgconfig
.To the INCLUDE environment variable add the 'libglade-2.0' directory.The
default path should be "
C:\Program Files\Gtk+\include\libglade-2.0
C:\Program Files\Gtk+\lib\pkgconfig;
C:\Program Files\Gtk+\lib\pkgconfig\include;
c:\users\user\downloads\libxml2-2.2.7-1_win32\lib\pkgconfig
...i'll have to try what you did to see if i can get it installed...
Good weekend
----- Original Message -----
From: Tim Baumgartner
To: [email protected]
Cc: Patrick Lynch
Sent: Friday, February 04, 2011 2:13 PM
Subject: Re: [Haskell-beginners] gtk2hs [GIMP ToolKit]
Hi Patrick,
I used the same link to install gtk2hs on Windows XP with Haskell Platform
2010.2.0 about 3 days ago. I'm a beginner as well. I had a number of problems.
In the end, I managed to install version 0.11 with some extra-work:
- I added HaskellPlatform/2010.2.0.0/mingw/bin to the PATH (because there is
my only current gcc.exe)
- ugly: I copied Gtk+/include/glib-2.0 to a temp folder and copied this again
*into* Gtk+/include/glib-2.0 (the output of pkg-config looked alright...)
- I repeated the previous steps for other include folders as well
Note: in order to install a specific version of a package you can e.g.
cabal install gtk2hs-buildtools-0.11.2
Installation of 0.12. failed with the following error:
[ 5 of 24] Compiling System.GIO.Volumes.VolumeMonitor (
dist\build\System\GIO\Volumes\VolumeMonitor.hs,
dist\build\System\GIO\Volumes\VolumeMonitor.o )
System\GIO\Volumes\VolumeMonitor.chs:56:4:
Not in scope: `vmDriveStopButton'
Regards,
Tim
2011/2/3 Patrick Lynch <[email protected]>
...I'm going to try to install gtk2hs again...
...I'll be using the link http://www.haskell.org/haskellwiki/Gtk2Hs
...I'd appreciate any help...
_______________________________________________
Beginners mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/beginners
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End of Beginners Digest, Vol 32, Issue 12
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