- Pharo-users - lists.pharo.org

Re: [Pharo-users] Hellp + PostgreSQL Connector

by Guillermo Polito

Hi Roberto! On Thu, Oct 18, 2012 at 3:01 PM, roberto.minelli(a)usi.ch < roberto.minelli(a)usi.ch> wrote: > Hello, > > I am Roberto Minelli, a PhD student in the REVEAL research group at the > Faculty of Informatics of the University of Lugano. > I am exploring Smalltalk, and Pharo, for the first time and I am open to > suggestions and tips & trick. > > Shortly I would like to work on something concrete to get in touch with > Smalltalk. > One of the things I am interested in, is retrieving entries from an > existing PostgreSQL database. > To this aim it would be great if some to you could point me in the right > direction. ;) > I can point you two on this front: - dbxtalk[1]: a open source database suite to work with several databases. For this one there is it's own mailing list. - postgresql native driver[2]: a native smalltalk driver to connect to a postgreV2 database Guille [1] dbxtalk.smallworks.com.ar [2] http://squeaksource.com/@leyVGjJ0XYt4ZPRt/9QfStt2T

Oct. 18, 2012

Hellp + PostgreSQL Connector

by roberto.minelli＠usi.ch

Hello, I am Roberto Minelli, a PhD student in the REVEAL research group at the Faculty of Informatics of the University of Lugano. I am exploring Smalltalk, and Pharo, for the first time and I am open to suggestions and tips & trick. Shortly I would like to work on something concrete to get in touch with Smalltalk. One of the things I am interested in, is retrieving entries from an existing PostgreSQL database. To this aim it would be great if some to you could point me in the right direction. ;) I also heard that there are some very cool "extensions" to the Pharo IDE (i.e., code completion, code browsing, etc). I would be glad if some of you could help me discovering all these cool features of Pharo! Thanks in advance, Roberto M.

Oct. 18, 2012

Re: [Pharo-users] OrderedCollection detect: <- exception if not found?

by Sven Van Caekenberghe

Another reason is that there could be a nil in your collection, by design or not, so that returning nil on not found would result in both of these (OrderedCollection with: nil) detect: [ :each | each isNil ] ifNone: [ nil ]. (OrderedCollection with: #somethingElse) detect: [ :each | each isNil ] ifNone: [ nil ]. being nil, so that you don't know the answer to what you want to know. On 16 Oct 2012, at 20:40, Mariano Martinez Peck <marianopeck(a)gmail.com> wrote: > On Tue, Oct 16, 2012 at 7:46 PM, sergio_101 <sergio.rrd(a)gmail.com> wrote: > i had a problem earlier, thinking that if i did a detect: on an > ordered collection, and the item was not found, i would get back nil. > it turns out that it throws an error.. > > to get this to work, you use: > > detect:ifNone: > > my only question is... why is this so? > > what is the motivation behind throwing an error rather than returning nil? > > i guess i would like to understand the 'smalltalkiness' about this, > just in case i run into something like this in the future.. > > > Smalltalk tries to be explicit and not to put things under the carpet. So in this case, it will throw an exception instead of returning nil. > If that is what you want, then you can always do detect: [ ... ] ifNone: [ nil ] and you will get the behavior you want. > So, forget for a moment all you background of any programming language you have, why would you expect to return nil? ;) > Anyway, we have to admit, there still places in Smalltalk where we return nil instead of throwing an exception. > > thanks! > > ---- > peace, > sergio > photographer, journalist, visionary > > http://www.ThoseOptimizeGuys.com > http://www.CodingForHire.com > http://www.coffee-black.com > http://www.painlessfrugality.com > http://www.twitter.com/sergio_101 > http://www.facebook.com/sergio101 > > -- > Mariano > http://marianopeck.wordpress.com -- Sven Van Caekenberghe http://stfx.eu Smalltalk is the Red Pill

Oct. 16, 2012

Re: [Pharo-users] Pharo sound capabilites. What options?

by Volkert Barr

Cool. I am sure that the main reason why FMSound did not work was, that it is by default disabled in pharo. :-((( I checked your snippets and found this behavior: "SoundPlayer boinkScale" works fine, even if sound is disabled in the pharo settings. "FMSound" is working fine", but only if sound is enabled in the pharo settings. "SampleSound" example sounds really strange on OS X. I am no sure, if this is correct, "SoundService default new" give me this message (in the pharo setting Sound theme "No Sounds" was selected), an this Message (in the pharo settings Sound theme "Beeper sounds" was selected): Thank you for your help. :-))) BW, Volkert On 16.10.2012, at 20:25, phil(a)highoctane.be wrote: > From my previous post: > > Also, you can use it this way (inspect and debug around to understand how all of this works, SoundPlayer isn't SoundSystem...) > > Test class>>soundSamples > "Test hardware" > > | ss | > SoundPlayer boinkScale. "See if sound is enabled" > SoundService soundEnabled. "This should answer the BaseSoundSystem class" > SoundService registeredClasses. > SoundService reset. > BaseSoundSystem soundEnabled: true. > SoundService default. "Let's make some noise" > ss := SoundService default new. > ss class soundEnabled. > ss class soundEnabled: true. > ss beep. > (FMSound lowMajorScaleOn: FMSound pluckedElecBass) play. > (FMSound lowMajorScaleOn: FMSound randomWeird1) play. > (FMSound majorScaleOn: FMSound oboe1) play. > FMSound testFMInteractively. > (SampledSound bachFugueVoice2On: SampledSound new) play. > SoundPlayer shutDown > > > 2012/10/16 Volkert Barr <volkert(a)nivoba.de> > Need still some help. Can someone post a code snippet? > > BW, > Volkert > > On 13.10.2012, at 15:44, Volkert Barr wrote: > > > No idea how. Have you a concrete example? > > > > On 13.10.2012, at 15:19, phil(a)highoctane.be wrote: > > > >> BaseSoundSystem soundEnabled: true just doesn't do all it should. > >> > >> SoundPlayer is the root of all; SoundSystems adds the background thread for multivoice play and mixing. > >> > >> Get SoundPlayer work, then take care of Soundsystem > >> > >> 2012/10/13 Volkert Barr <volkert(a)nivoba.de> > >> I loaded the package now i a clean Pharo 1.4 Image with the latest update: #14459 (on OS X Lion 10.7.5). > >> > >> The MIDIPianoKeyboardMorph works, but FMSound not (no errors, but silence) > >> > >> For FMSound i tried this > >> - BaseSoundSystem soundEnabled: true. > >> - FMSound organ1 play. > >> > >> Any hints here? > >> > >> Volkert > >> > > > > -- www.nivoba.de www.software-wartung.net www.erlang-dach.org PGP-Key on request / PGP-SchlÃ¼ssel auf Anfrage

Oct. 16, 2012

Re: [Pharo-users] OrderedCollection detect: <- exception if not found?

by Mariano Martinez Peck

On Tue, Oct 16, 2012 at 7:46 PM, sergio_101 <sergio.rrd(a)gmail.com> wrote: > i had a problem earlier, thinking that if i did a detect: on an > ordered collection, and the item was not found, i would get back nil. > it turns out that it throws an error.. > > to get this to work, you use: > > detect:ifNone: > > my only question is... why is this so? > > what is the motivation behind throwing an error rather than returning nil? > > i guess i would like to understand the 'smalltalkiness' about this, > just in case i run into something like this in the future.. > > Smalltalk tries to be explicit and not to put things under the carpet. So in this case, it will throw an exception instead of returning nil. If that is what you want, then you can always do detect: [ ... ] ifNone: [ nil ] and you will get the behavior you want. So, forget for a moment all you background of any programming language you have, why would you expect to return nil? ;) Anyway, we have to admit, there still places in Smalltalk where we return nil instead of throwing an exception. > thanks! > > > -- > ---- > peace, > sergio > photographer, journalist, visionary > > http://www.ThoseOptimizeGuys.com > http://www.CodingForHire.com > http://www.coffee-black.com > http://www.painlessfrugality.com > http://www.twitter.com/sergio_101 > http://www.facebook.com/sergio101 > > -- Mariano http://marianopeck.wordpress.com

Oct. 16, 2012

Re: [Pharo-users] Pharo sound capabilites. What options?

by phil＠highoctane.be

>From my previous post: Also, you can use it this way (inspect and debug around to understand how all of this works, SoundPlayer isn't SoundSystem...) Test class>>soundSamples "Test hardware" | ss | SoundPlayer boinkScale. "See if sound is enabled" SoundService soundEnabled. "This should answer the BaseSoundSystem class" SoundService registeredClasses. SoundService reset. BaseSoundSystem soundEnabled: true. SoundService default. "Let's make some noise" ss := SoundService default new. ss class soundEnabled. ss class soundEnabled: true. ss beep. (FMSound lowMajorScaleOn: FMSound pluckedElecBass) play. (FMSound lowMajorScaleOn: FMSound randomWeird1) play. (FMSound majorScaleOn: FMSound oboe1) play. FMSound testFMInteractively. (SampledSound bachFugueVoice2On: SampledSound new) play. SoundPlayer shutDown 2012/10/16 Volkert Barr <volkert(a)nivoba.de> > Need still some help. Can someone post a code snippet? > > BW, > Volkert > > On 13.10.2012, at 15:44, Volkert Barr wrote: > > > No idea how. Have you a concrete example? > > > > On 13.10.2012, at 15:19, phil(a)highoctane.be wrote: > > > >> BaseSoundSystem soundEnabled: true just doesn't do all it should. > >> > >> SoundPlayer is the root of all; SoundSystems adds the background thread > for multivoice play and mixing. > >> > >> Get SoundPlayer work, then take care of Soundsystem > >> > >> 2012/10/13 Volkert Barr <volkert(a)nivoba.de> > >> I loaded the package now i a clean Pharo 1.4 Image with the latest > update: #14459 (on OS X Lion 10.7.5). > >> > >> The MIDIPianoKeyboardMorph works, but FMSound not (no errors, but > silence) > >> > >> For FMSound i tried this > >> - BaseSoundSystem soundEnabled: true. > >> - FMSound organ1 play. > >> > >> Any hints here? > >> > >> Volkert > >> > > > >

Oct. 16, 2012

Re: [Pharo-users] adding multiple items to OrderedCollection remove:

by Paul DeBruicker

col1 removeAll: col2 On 10/16/2012 10:41 AM, sergio_101 wrote: > suppose i have: > > and ordered collection with: objectA, objectB, objectC > > i want to remove objects and be.. > > what would be the best shorthand way to do this with one expression, > rather than... > > orderedCollection remove: objectA > orderedCollection remove: objectB > > thanks! > >

Oct. 16, 2012

OrderedCollection detect: <- exception if not found?

by sergio_101

i had a problem earlier, thinking that if i did a detect: on an ordered collection, and the item was not found, i would get back nil. it turns out that it throws an error.. to get this to work, you use: detect:ifNone: my only question is... why is this so? what is the motivation behind throwing an error rather than returning nil? i guess i would like to understand the 'smalltalkiness' about this, just in case i run into something like this in the future.. thanks! -- ---- peace, sergio photographer, journalist, visionary http://www.ThoseOptimizeGuys.com http://www.CodingForHire.com http://www.coffee-black.com http://www.painlessfrugality.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

Oct. 16, 2012

adding multiple items to OrderedCollection remove:

by sergio_101

suppose i have: and ordered collection with: objectA, objectB, objectC i want to remove objects and be.. what would be the best shorthand way to do this with one expression, rather than... orderedCollection remove: objectA orderedCollection remove: objectB thanks! -- ---- peace, sergio photographer, journalist, visionary http://www.ThoseOptimizeGuys.com http://www.CodingForHire.com http://www.coffee-black.com http://www.painlessfrugality.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

Oct. 16, 2012

Re: [Pharo-users] SUnit - works in its own space?

by sergio_101

On Tue, Oct 16, 2012 at 1:01 PM, James Foster <Smalltalk(a)jgfoster.net> wrote: > SUnit is just Smalltalk code and class variables are just objects. If you modify an object it is modified. > > My approach to this problem is to modify the "singleton" pattern so that a class has both a "default" instance and a "current" instance. The #'current' method returns the current value if it is not nil, otherwise it returns the default value. The SUnit #'setUp' method sends a new instance as the argument to #'current:', and the #'tearDown' method sets current to nil. Most of you code asks for the current value; this will be the default or the test instance, depending on whether or not the tests are running. > this sounds handy.. i am going to have to write a few of these to make sure i get it.. -- ---- peace, sergio photographer, journalist, visionary http://www.ThoseOptimizeGuys.com http://www.CodingForHire.com http://www.coffee-black.com http://www.painlessfrugality.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

Oct. 16, 2012