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• show UIAlertView when In app purchase is in progress

  - by edie

  Hi... I've added an UIAlertView that has UIActivityIndicatior as a subview on my application. This alertView only show when the purchase is in progress. I've put my alert view in this way in my StoreObserver: - (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions { for (SKPaymentTransaction *transaction in transactions) { switch (transaction.transactionState) { case SKPaymentTransactionStatePurchasing: [self stillPurchasing]; // this creates an alertView and shows break; case SKPaymentTransactionStatePurchased: [self completeTransaction:transaction]; break; case SKPaymentTransactionStateFailed: [self failedTransaction:transaction]; break; case SKPaymentTransactionStateRestored: [self restoreTransaction:transaction]; break; default: break; } } } - (void) stillPurchasing { UIAlertView *alert = [[UIAlertView alloc]initWithTitle: @"In App Purchase" message: @"Processing your purchase..." delegate: nil cancelButtonTitle: nil otherButtonTitles: nil]; self.alertView = alert; [alert release]; UIActivityIndicatorView *ind = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge]; self.indicator = ind; [ind release]; [self.indicator startAnimating]; [self.alertView addSubview: self.indicator]; [self.alertView show]; } When I tap my the buy button this UIAlertView shows together with my UIActivityIndicator.. But when the transaction completes the alertView still on the top of the view and the Indicator was the only one that was removed. My question was how should I release the alertView? Or where/When should I release it. I've added these command to release my alertView and Indicator on these cases: case SKPaymentTransactionStatePurchased: case SKPaymentTransactionStateFailed: case SKPaymentTransactionStateRestored: [self.indicator stopAnimating]; [self.indicator removeFromSuperview]; [self.alertView release]; [self.indicator release]; I've only added the alertView to show that the purchasing was still in progress. Any suggestion to create any feedback to users will be thankful for me.. Thanks

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• sqlalchemy relation through another (declarative)

  - by clayg

  Is anyone familiar with ActiveRecord's "has_many :through" relations for models? I'm not really a Rails guy, but that's basically what I'm trying to do. As a contrived example consider Projects, Programmers, and Assignments: from sqlalchemy import create_engine from sqlalchemy.orm import sessionmaker from sqlalchemy import Column, ForeignKey from sqlalchemy.types import Integer, String, Text from sqlalchemy.orm import relation from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class Assignment(Base): __tablename__ = 'assignment' id = Column(Integer, primary_key=True) description = Column(Text) programmer_id = Column(Integer, ForeignKey('programmer.id')) project_id = Column(Integer, ForeignKey('project.id')) def __init__(self, description=description): self.description = description def __repr__(self): return '<Assignment("%s")>' % self.description class Programmer(Base): __tablename__ = 'programmer' id = Column(Integer, primary_key=True) name = Column(String(64)) assignments = relation("Assignment", backref='programmer') def __init__(self, name=name): self.name = name def __repr__(self): return '<Programmer("%s")>' % self.name class Project(Base): __tablename__ = 'project' id = Column(Integer, primary_key=True) name = Column(String(64)) description = Column(Text) assignments = relation("Assignment", backref='project') def __init__(self, name=name, description=description): self.name = name self.description = description def __repr__(self): return '<Project("%s", "%s...")>' % (self.name, self.description[:10]) engine = create_engine('sqlite://') Base.metadata.create_all(engine) Session = sessionmaker(bind=engine) session = Session() Projects have many Assignments. Programmers have many Assignments. (understatement?) But in my office at least, Programmers also have many Projects - I'd like this relationship to be inferred through the Assignments assigned to the Programmer. I'd like the Programmer model to have a attribute "projects" which will return a list of Projects associated to the Programmer through the Assignment model. me = session.query(Programmer).filter_by(name='clay').one() projects = session.query(Project).\ join(Project.assignments).\ join(Assignment.programmer).\ filter(Programmer.id==me.id).all() How can I describe this relationship clearly and simply using the sqlalchemy declarative syntax? Thanks!

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• django simple approach to multi-field search

  - by Scott Willman

  I have a simple address book app that I want to make searchable. The model would look something like: class Address(models.Model): address1 = models.CharField("Address Line 1", max_length=128) address2 = models.CharField("Address Line 2", max_length=128) city = models.CharField("City", max_length=128) state = models.CharField("State", max_length=24) zipCode = models.CharField("Zip Code", max_length=24) def __unicode__(self): return "%s %s, %s, %s, %s" % (self.address1, self.address2, self.city, self.state, self.zipCode) class Entry(models.Model): name = models.CharField("Official School Name", max_length=128) createdBy = models.ForeignKey(User) address = models.ForeignKey(Address, unique=True) def __unicode__(self): return "%s - %s, %s" % (self.name, self.address.city, self.address.state) I want the searching to be fairly loose, like: Bank of America Los Angeles 91345. It seems like I want a field that contains all of those elements into one that I can search, but that also seems redundant. I was hoping I could add a method to the Entry model like this: def _getSearchText(self): return "%s %s %s" % (self.name, self.address, self.mascot) searchText = property(_getSearchText) ...and search that as a field, but I suppose that's wishful thinking... How should I approach this using basic Django and SqLite (this is a learning exercise). Thank you!!

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• PyQt - QLabel inheriting

  - by Ockonal

  Hello, i wanna inherit QLabel to add there click event processing. I'm trying this code: class NewLabel(QtGui.QLabel): def __init__(self, parent): QtGui.QLabel.__init__(self, parent) def clickEvent(self, event): print 'Label clicked!' But after clicking I have no line 'Label clicked!' EDIT: Okay, now I'm using not 'clickEvent' but 'mousePressEvent'. And I still have a question. How can i know what exactly label was clicked? For example, i have 2 edit box and 2 labels. Labels content are pixmaps. So there aren't any text in labels, so i can't discern difference between labels. How can i do that? EDIT2: I made this code: class NewLabel(QtGui.QLabel): def __init__(self, firstLabel): QtGui.QLabel.__init__(self, firstLabel) def mousePressEvent(self, event): print 'Clicked' #myLabel = self.sender() # None =) self.emit(QtCore.SIGNAL('clicked()'), "Label pressed") In another class: self.FirstLang = NewLabel(Form) QtCore.QObject.connect(self.FirstLang, QtCore.SIGNAL('clicked()'), self.labelPressed) Slot in the same class: def labelPressed(self): print 'in labelPressed' print self.sender() But there isn't sender object in self. What i did wrong?

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• python os.mkfifo() for Windows

  - by user302099

  Hello. Short version (if you can answer the short version it does the job for me, the rest is mainly for the benefit of other people with a similar task): In python in Windows, I want to create 2 file objects, attached to the same file (it doesn't have to be an actual file on the hard-drive), one for reading and one for writing, such that if the reading end tries to read it will never get EOF (it will just block until something is written). I think in linux os.mkfifo() would do the job, but in Windows it doesn't exist. What can be done? (I must use file-objects). Some extra details: I have a python module (not written by me) that plays a certain game through stdin and stdout (using raw_input() and print). I also have a Windows executable playing the same game, through stdin and stdout as well. I want to make them play one against the other, and log all their communication. Here's the code I can write (the get_fifo() function is not implemented, because that's what I don't know to do it Windows): class Pusher(Thread): def __init__(self, source, dest, p1, name): Thread.__init__(self) self.source = source self.dest = dest self.name = name self.p1 = p1 def run(self): while (self.p1.poll()==None) and\ (not self.source.closed) and (not self.source.closed): line = self.source.readline() logging.info('%s: %s' % (self.name, line[:-1])) self.dest.write(line) self.dest.flush() exe_to_pythonmodule_reader, exe_to_pythonmodule_writer =\ get_fifo() pythonmodule_to_exe_reader, pythonmodule_to_exe_writer =\ get_fifo() p1 = subprocess.Popen(exe, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE) old_stdin = sys.stdin old_stdout = sys.stdout sys.stdin = exe_to_pythonmodule_reader sys.stdout = pythonmodule_to_exe_writer push1 = Pusher(p1.stdout, exe_to_pythonmodule_writer, p1, '1') push2 = Pusher(pythonmodule_to_exe_reader, p1.stdin, p1, '2') push1.start() push2.start() ret = pythonmodule.play() sys.stdin = old_stdin sys.stdout = old_stdout

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• How can I override list methods to do vector addition and subtraction in python?

  - by Bobble

  I originally implemented this as a wrapper class around a list, but I was annoyed by the number of operator() methods I needed to provide, so I had a go at simply subclassing list. This is my test code: class CleverList(list): def __add__(self, other): copy = self[:] for i in range(len(self)): copy[i] += other[i] return copy def __sub__(self, other): copy = self[:] for i in range(len(self)): copy[i] -= other[i] return copy def __iadd__(self, other): for i in range(len(self)): self[i] += other[i] return self def __isub__(self, other): for i in range(len(self)): self[i] -= other[i] return self a = CleverList([0, 1]) b = CleverList([3, 4]) print('CleverList does vector arith: a, b, a+b, a-b = ', a, b, a+b, a-b) c = a[:] print('clone test: e = a[:]: a, e = ', a, c) c += a print('OOPS: augmented addition: c += a: a, c = ', a, c) c -= b print('OOPS: augmented subtraction: c -= b: b, c, a = ', b, c, a) Normal addition and subtraction work in the expected manner, but there are problems with the augmented addition and subtraction. Here is the output: >>> CleverList does vector arith: a, b, a+b, a-b = [0, 1] [3, 4] [3, 5] [-3, -3] clone test: e = a[:]: a, e = [0, 1] [0, 1] OOPS: augmented addition: c += a: a, c = [0, 1] [0, 1, 0, 1] Traceback (most recent call last): File "/home/bob/Documents/Python/listTest.py", line 35, in <module> c -= b TypeError: unsupported operand type(s) for -=: 'list' and 'CleverList' >>> Is there a neat and simple way to get augmented operators working in this example?

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• How can I discard 2 choices out of 4 from my Array of choice

  - by Umaid

  Actually I have four choice out of which i need to discard to choice on button click like 50/50 , then it will show only 2 choice for user to select out which one is correct and one is wrong -(IBAction)Rebind:(id)sender { if (i == [QuizArray count]) { if([sender tag] == 1) //if([sender tag] == 1) { [self.CorrectArr addObject:@"A"]; //[self.CorrectArr addObject:mydiet.varOpt1]; } else if([sender tag] == 2) { [self.CorrectArr addObject:@"B"]; //[self.CorrectArr addObject:mydiet.varOpt2]; } else if([sender tag] == 3) { [self.CorrectArr addObject:@"C"]; //[self.CorrectArr addObject:mydiet.varOpt3]; } else if([sender tag] == 4) { [self.CorrectArr addObject:@"D"]; //[self.CorrectArr addObject:mydiet.varOpt4]; } Score *myscore = [[Score alloc] initWithNibName:@"Score" bundle:nil]; myscore.SelectedArr = CorrectArr; [self.view addSubview:myscore.view]; } else { NSString *questionstring = [NSString stringWithFormat:[[QuizArray objectAtIndex:i] varQuestion]]; self.myquestion.text = questionstring; [btn1 setTitle:[[AnswerArray objectAtIndex:i] varAnswer] forState:normal]; if([sender tag] == 1) { [self.CorrectArr addObject:@"A"]; //addObject:mydiet.varOpt1]; } else if([sender tag] == 2) { [self.CorrectArr addObject:@"B"]; //addObject:mydiet.varOpt2]; } else if([sender tag] == 3) { [self.CorrectArr addObject:@"C"]; //addObject:mydiet.varOpt3]; } else if([sender tag] == 4) { [self.CorrectArr addObject:@"D"]; //addObject:mydiet.varOpt4]; } } i = i + 1; //} }

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• RapidXML - does not compile ?

  - by milan

  Hi, I am novice to rapidXML but first impresion was not positive, I made simple Visual Studio 6 C++ Hello World Application and added RapidXML hpp files to project and in main.cpp I put: #include "stdafx.h" #include < iostream > #include < string > #include "rapidxml.hpp" using namespace std; using namespace rapidxml; int main ( ) { char x[] = "<Something>Text</Something>\0" ; //<<<< funktioniert, aber mit '*' nicht xml_document<> doc ; doc.parse<0>(x) ; cout << "Name of my first node is: " << doc.first_node()->name() << endl ; xml_node<>* node = doc.first_node("Something") ; cout << "Node 'Something' has value: " << node->value() << endl ; } And it does not compile, any help ? Is RapidXML possible to run with Visual Studio 6 ? Error I am getting are: --------------------Configuration: aaa - Win32 Debug-------------------- Compiling... rapidxml.cpp c:\Parser\rapidxml.cpp(310) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(320) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(320) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(385) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(417) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(417) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(448) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(448) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(476) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(579) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(599) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(639) : see reference to class template instantiation 'rapidxml::memory_pool<Ch>' being compiled c:\Parser\rapidxml.cpp(681) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(790) : see reference to class template instantiation 'rapidxml::xml_base<Ch>' being compiled c:\Parser\rapidxml.cpp(700) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(790) : see reference to class template instantiation 'rapidxml::xml_base<Ch>' being compiled c:\Parser\rapidxml.cpp(721) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(790) : see reference to class template instantiation 'rapidxml::xml_base<Ch>' being compiled c:\Parser\rapidxml.cpp(751) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(790) : see reference to class template instantiation 'rapidxml::xml_base<Ch>' being compiled c:\Parser\rapidxml.cpp(786) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(790) : see reference to class template instantiation 'rapidxml::xml_base<Ch>' being compiled c:\Parser\rapidxml.cpp(787) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(790) : see reference to class template instantiation 'rapidxml::xml_base<Ch>' being compiled c:\Parser\rapidxml.cpp(836) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(876) : see reference to class template instantiation 'rapidxml::xml_attribute<Ch>' being compiled c:\Parser\rapidxml.cpp(856) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(876) : see reference to class template instantiation 'rapidxml::xml_attribute<Ch>' being compiled c:\Parser\rapidxml.cpp(936) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(1345) : see reference to class template instantiation 'rapidxml::xml_node<Ch>' being compiled c:\Parser\rapidxml.cpp(958) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(1345) : see reference to class template instantiation 'rapidxml::xml_node<Ch>' being compiled c:\Parser\rapidxml.cpp(981) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(1345) : see reference to class template instantiation 'rapidxml::xml_node<Ch>' being compiled c:\Parser\rapidxml.cpp(1004) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(1345) : see reference to class template instantiation 'rapidxml::xml_node<Ch>' being compiled c:\Parser\rapidxml.cpp(1025) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(1345) : see reference to class template instantiation 'rapidxml::xml_node<Ch>' being compiled c:\Parser\rapidxml.cpp(1045) : error C2039: 'size_t' : is not a member of 'std' c:\Parser\rapidxml.cpp(1345) : see reference to class template instantiation 'rapidxml::xml_node<Ch>' being compiled Error executing cl.exe. rapidxml.obj - 25 error(s), 0 warning(s)

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• Programming activities for high school kids who have no idea what CS or programming is

  - by pointdxt

  I work at a small high school that's in a very high poverty area. There are only a handful of seniors that are thinking about applying to be an engineer of some sort in college and only 1 kid that applied for Computer Science (he has a couple acceptances so far!). He's been talking to me a lot as I majored in Computer Science as well and he is very excited about it. Unfortunately, our school doesn't have a Computer Science course of any kind so he asks me a lot of stuff. I want to help him out since he's really excited about majoring in CS but I don't know where to begin. I could say put Linux on a computer, go online and go research stuff like I did but this kid needs some direction and he doesn't even know what Linux is let alone have a free computer around for that sort of thing. He doesn't know much about CS but is keenly interested in having a computer do all sorts of things but I don't know how to help him in a meaningful way. Any advice? I'm not a teacher at the school so I'm not a great educator, I do IT at the school.

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• Python progression path - From apprentice to guru

  - by Morlock

  Hi all, I've been learning, working, and playing with Python for a year and a half now. As a biologist slowly making the turn to bio-informatics, this language has been a the very core of all the major contributions I have made in the lab. (bash and R scripts have helped some too. My C++ capabilities are very not functional yet). I more or less fell in love with the way Python permits me to express beautiful solutions and also with the semantics of the language that allows such a natural flow from thoughts to workable code. What I would like to know from you is your answer to a kind of question I have seldom seen in this or other forums. Let me sum up what I do NOT want to ask first ;) I don't want to know how to QUICKLY learn Python Nor do I want to find out the best way to get acquainted with the language Finally, I don't want to know a 'one trick that does it all' approach. What I do want to know your opinion about, is: What are the steps YOU would recommend to a Python journeyman, from apprenticeship to guru status (feel free to stop wherever your expertise dictates it), in order that one IMPROVES CONSTANTLY, becoming a better and better Python coder, one step at a time. The kind of answers I would enjoy (but feel free to surprise the readership :P ), is formatted more or less like this: Read this (eg: python tutorial), pay attention to that kind of details Code for so manytime/problems/lines of code Then, read this (eg: this or that book), but this time, pay attention to this Tackle a few real-life problems Then, proceed to reading Y. Be sure to grasp these concepts Code for X time Come back to such and such basics or move further to... (you get the point :) This process depicts an iterative Learn/Code cycle, and I really care about knowing your opinion on what exactly one should pay attention to, at various stages, in order to progress CONSTANTLY (with due efforts, of course). If you come from a specific field of expertise, discuss the path you see as appropriate in this field. Thanks a lot for sharing your opinions and good Python coding!

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• IM (Instant Messaging) increase or decrease developer's productivity?

  - by GRGodoi

  In my team I have some developers that always have two or three IM windows open. The majority of these windows are not related with the project where they are nor with asking or offering programming help. I also use IM and, off course, some of my "talks" are not related with the job. But I feel that when I am using IM my productivity drops. I mean, there is more "mental" work to change the scope between the task I am doing and the conversation every time a new message arrive. Do you face the same situation? Is there some good practices to avoid this (excluding, off course, stopping using IM)?

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• Run WCF ServiceHost with multiple contracts

  - by Sam

  Running a ServiceHost with a single contract is working fine like this: servicehost = new ServiceHost(typeof(MyService1)); servicehost.AddServiceEndpoint(typeof(IMyService1), new NetTcpBinding(), "net.tcp://127.0.0.1:800/MyApp/MyService1"); servicehost.Open(); Now I'd like to add a second (3rd, 4th, ...) contract. My first guess would be to just add more endpoints like this: servicehost = new ServiceHost(typeof(MyService1)); servicehost.AddServiceEndpoint(typeof(IMyService1), new NetTcpBinding(), "net.tcp://127.0.0.1:800/MyApp/MyService1"); servicehost.AddServiceEndpoint(typeof(IMyService2), new NetTcpBinding(), "net.tcp://127.0.0.1:800/MyApp/MyService2"); servicehost.Open(); But of course this does not work, since in the creation of ServiceHost I can either pass MyService1 as parameter or MyService2 - so I can add a lot of endpoints to my service, but all have to use the same contract, since I only can provide one implementation? I got the feeling I'm missing the point, here. Sure there must be some way to provide an implementation for every endpoint-contract I add, or not?

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• Improving as a coder with respect to design.

  - by dmarakaki

  As a soon-to-be computer science graduate, I have to come realization that I have a long way to go when it comes to the overall design of an application. After spending many semesters of programming from the hip I have come to appreciate the mulling over the needs of an application before diving head first into the coding portion. My question is to the intermediate and expert programmers, how can I improve in the area of the design phase of development?

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• How can an amateur programmer become professional without formal education (college) outside the US

  - by AlexRednic

  What is the path? Do I get certified (Microsoft,Sun,etc)? How do I build reputation? How do I make myself valuable without a college degree? How do I make others recognize my value? These are just a few questions but all point in the same direction. Are any of you in the same situation? What paths did you follow to become a successful programmer without the need of formal education?

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• Summer Programming Plans

  - by Gabe

  I've wanted to start "hacking" for many months now. But I put it off in favor of school and other things. Now, though, I'm free for the summer and want to learn as much as I can. I have a rough idea of what I want to try my hand at, but need some guidance as to what specifically - and how - I should learn. This is my plan so far: 1) Get good at programming in general. I plan to read up on how to think/work like a programmer. I'm waiting for the Pragmatic Programmer to arrive, which will be the first book I read. Q: What other books/ebooks should I look at? What more can I do here? 2) Learn/Improve at HTML/CSS. My first project will be to make a personal website/blog for myself using HTML and CSS. ----Then I hope to write/design articles like Dustin Curtis. After I finish this (and learn a programming language) I'll try to create user-based a user-focused website. Q: It's my understanding that just trying to design/manage websites is a good way to learn/improve at HTML/CSS. Is that all correct? 3) Try music development. This might be a sort of stretch for stackoverflow, but I'm interested in mixing/making techno songs. (Think Justice, or Daft Punk, or MSTRKRFT.) Q: I have a Mac. Any ideas on how I could start/learn music making? Any programs I should download, for instance? 4) My main goal: Learning a web development language/framework. I'm a year into learning/using C++. But what I really want to do is develop websites and web apps. I've searched online, and there seems to be great debate over which language/framework to learn first (and which is best). I think I've narrowed it down to three: Ruby (Rails), Python (Django), and PHP (?). Q #1: Which should I learn and use first? (Reasons?) Q #2: One reason I was leaning towards PHP is that I'm taking a PHP development course next semester. Learning it now would make that course easy. If PHP was not the answer to Q #1, is it worth learning both? Or, would it be better to just focus on PHP for this summer and next semester, and then transition thereafter to a better language? 5) iPhone/iPad Programming (Maybe). I've a number of simple, useful app ideas that I'd like to eventually get too. I just bought a Mac, as well as a few app development books. Q #1: Am I spreading myself thin trying to learn all of the above, and objective-C? Q #2: How much harder/easier is objective-C compared to the above languages? Also, how easy is it to learn obj-C after learning a web development language (and some C++)? Q #3: Yes or no? Should I go for it, or just keeep with #1-4 for now? Also: If you have any tips on how I should learn (or how you learned to hack), I'm all ears. I'd be especially interested in how you planned out learning: did you just hack whenever you felt like it, or did you "study" the language a few hours a day, or something else? Thanks so much, guys.

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• handling refrence to pointers/double pointers using SWIG [C++ to Java]

  - by Siddu

  My code has an interface like class IExample { ~IExample(); //pure virtual methods ...}; a class inheriting the interface like class CExample : public IExample { protected: CExample(); //implementation of pure virtual methods ... }; and a global function to create object of this class - createExample( IExample *& obj ) { obj = new CExample(); } ; Now, I am trying to get Java API wrapper using SWIG, the SWIG generated interface has a construcotr like - IExample(long cPtr, boolean cMemoryOwn) and global function becomes createExample(IExample obj ) The problem is when i do, IExample exObject = new IExample(LogFileLibraryJNI.new_plong(), true /*or false*/ ); createExample( exObject ); The createExample(...) API at C++ layer succesfully gets called, however, when call returns to Java layer, the cPtr (long) variable does not get updated. Ideally, this variable should contain address of CExample object. I read in documentation that typemaps can be used to handle output parameters and pointer references as well; however, I am not able to figure out the suitable way to use typemaps to resolve this problem, or any other workaround. Please suggest if i am doing something wrong, or how to use typemap in such situation?

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• Populate Textbox in UserForm Using Contents of Another Textbox

  - by Daniel

  I have 5 worksheets and would like all the textboxes to display the same value, whatever the user enters in the first textbox. Can that be done without code? How would I do it with code?

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• Tutorial on Using OpenSSL with pthreads

  - by Sadeq Dousti

  OpenSSL documents state that it can safely be used in multi-threaded applications provided that at least two callback functions are set, locking_function and threadid_func.... I've written programs which use OpenSSL API. Moreover, I know how to use pthreads. However, the OpenSSL documents are written in the form of a manual, and I can't see a step-by-step guide on what I have to do when using OpenSSL in a multi-threaded app. Is there a tutorial on using OpenSSL with pthreads? (I searched the web, but no satisfactory result appeared.) PS: I'm working in Debian Lenny & Ubuntu Lucid/Maverick. PS2: OpenSSL includes a sample, but it's far too complicated to start with.

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• Workflow Service host not publishing Metadata.

  - by jlafay

  Still hacking away with extreme persistence at WF services hosted outside of IIS. I'm now having issues with my WF service publishing metadata. Can someone take a look at my code and see what step I'm missing? The few tutorials that I've stumbled across for my scenario make it look so easy, and I know it is. I'm just missing something ridiculously simple. Here's my current trial code: const string serviceUri = "http://localhost:9009/Subscribe"; WorkflowServiceHost host = new WorkflowServiceHost( new Subscribe(), new Uri(serviceUri) ); SubscriberSvcHost.AddDefaultEndpoints( ); SubscriberSvcHost.Open(); Subscribe() is an activity that is coded in an xaml file and contains simple receive and sendreply activities to test out my hosted workflow service. It is NOT a xamlx (WF service) file. Seems like this should be simple enough to work but when I start the application and the service fires I get this message in my browser when navigating to the URI: "Metadata publishing for this service is currently disabled." Shouldn't adding the default endpoints provide enough metadata and description to satisfy the service init and then go into its wait for message state?

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• Generic tree implementation in Java

  - by Ivan

  Is anyone aware of a generic tree (nodes may have multiple children) implementation for Java? It should come from a well trusted source and must be fully tested. It just doesn't seem right implementing it myself. Almost reminds me of my university years when we were supposed to write all our collections ourselves. EDIT: Found this project on java.net, might be worth looking into.

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• ASP.NET 2.0: Specifying an instance of an object for an ObjectDataSource

  - by Austin Salonen

  I'm using an ObjectDataSource to bind data to a GridView; it works fine except that it always creates a new object to use as a data source. I can do all the setup just fine but I cannot use an instance of an existing object to specify as the "data source" for it. Is it possible to do this? If so, how? If it's not possible, why? EDIT: Here's the gist of what's going on (object types changed): On the first page you are editting the attributes for a dog. One of the attributes is "has puppies" and if it's true, the next page you specify the names of those puppies. What's happening in my case is that those puppies are not getting linked to the original dog but to a "new" dog. (The implication that my problem is a "female dog" was coincidental. ;-) )

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• Excel formula to show linked cell ID

  - by Jeremy Rudd

  In an excel cell, I've placed a simple formula =C4 The cell typically displays the value of cell C4, but instead I want to see the linked cell ID instead, which in this case is "C4". Is there a formula to show me this? like: =SHOWCELL(C4)

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• Passing char * into fopen with C.

  - by Rhys

  Hey there, I'm writing a program that passes data from a file into an array, but I'm having trouble with fopen (). It seems to work fine when I hardcode the file path into the parameters (eg fopen ("data/1.dat", "r");) but when I pass it as a pointer, it returns NULL. Note that line 142 will print "data/1.dat" if entered from command line so parse_args () appears to be working. 132 int 133 main(int argc, char **argv) 134 { 135 FILE *in_file; 136 int *nextItem = (int *) malloc (sizeof (int)); 137 set_t *dictionary; 138 139 /* Parse Arguments */ 140 clo_t *iopts = parse_args(argc, argv); 141 142 printf ("INPUT FILE: %s.\n", iopts->input_file); /* This prints correct path */ 143 /* Initialise dictionary */ 144 dictionary = set_create (SET_INITAL_SIZE); 145 146 /* Use fscanf to read all data values into new set_t */ 147 if ((in_file = fopen (iopts->input_file, "r")) == NULL) 148 { 149 printf ("File not found...\n"); 150 return 0; 151 } Thanks! Rhys

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• ruby xmpfilter on windows

  - by dreftymac

  Has anyone out there ever gotten xmpfilter to work on windows? xmpfilter "unterminated string meets end of file" is the error. The only Google hit is in Japanese: google://xmpfilter "unterminated string meets end of file" http://www.unkar.org/read/pc12.2ch.net/tech/1249687283 For background, the desired feature from xmpfilter is to get automatic "eval" annotations of Ruby sourcecode: Before: a = "bravo alpha charlie" # => b = a.split # => b.sort! # => After: a = "bravo alpha charlie" # => "bravo alpha charlie" b = a.split # => ["bravo", "alpha", "charlie"] b.sort! # => ["alpha", "bravo", "charlie"]

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• Weird error running com-exposed assembly

  - by Bernabé Panarello

  I am facing the following issue when deploying a com-exposed assembly to my client's. The COM component should be consummed by a vb6 application. Here's how it's done 1) I have one c# project which has a class with a couple of methods exposed to COM 2) The project has references to multiple assemblies 3) I compile the project, generating a folder (named dllcom) that contains the assembly plus all the referenced dlls 4) I include in the folder a .bat which does the following: regasm /u c:\dllcom\LibInsertador.dll del LibInsertador.tlb regasm c:\dllcom\LibInsertador.dll /tlb:c:\dllcom\LibInsertador.tlb /codebase c:\dllcom\ pause 5) After running the bat locally in many workstations of my laboratory, i'm able to consume the generated tlb from my vb6 application without any problems. I'm even able to update the dll by only means of running this bat, without having to recompile the vb6 application. I mean that im not having issues of vb6 fiding and invoking the exposed com object. The problem 6) I send the SAME FOLDER to my client 7) They execute the .bat locally, without any errors 8) They execute the vb6 application, vb6 finds the main assembly, the .net code seems to run correctly (it's even able to generate a log file) until it has to intantiate it's first referenced assembly. Then, they get the following exception: "Could not load type 'GYF.Common.TypeBuilder' from assembly 'GYF_Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'." Where "GYF.Common" is an assembly referenced by LibInsertador and TypeBuilder is a class contained in GYF.Common. GYF.Common is not a signed assembly and it's not in the GAC, just in the same folder with Libinsertador. According to .net reflector, the version is correct. ¿Any ideas about what could be happening?

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