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  • iPhone Rendering Question

    - by slythic
    Hi all, I'm new to iPhone/Objective-C development. I "jumped the gun" and started reading and implementing some chapters from O'Reilly's iPhone Development. I was following the ebook's code exactly and my code was generating the following error: CGContextSetFillColorWithColor: invalid context CGContextFillRects: invalid context CGContextSetFillColorWithColor: invalid context CGContextGetShouldSmoothFonts: invalid context However, when I downloaded the sample code for the same chapter the code is different. Book Code: - (void) Render { CGContextRef g = UIGraphicsGetCurrentContext(); //fill background with gray CGContextSetFillColorWithColor(g, [UIColor grayColor].CGColor); CGContextFillRect(g, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)); //draw text in black. CGContextSetFillColorWithColor(g, [UIColor blackColor].CGColor); [@"O'Reilly Rules!" drawAtPoint:CGPointMake(10.0, 20.0) withFont:[UIFont systemFontOfSize:[UIFont systemFontSize]]]; } Actual Project Code from the website (works): - (void) Render { [self setNeedsDisplay]; //this sets up a deferred call to drawRect. } - (void)drawRect:(CGRect)rect { CGContextRef g = UIGraphicsGetCurrentContext(); //fill background with gray CGContextSetFillColorWithColor(g, [UIColor grayColor].CGColor); CGContextFillRect(g, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)); //draw text in black. CGContextSetFillColorWithColor(g, [UIColor blackColor].CGColor); [@"O'Reilly Rules!" drawAtPoint:CGPointMake(10.0, 20.0) withFont:[UIFont systemFontOfSize:[UIFont systemFontSize]]]; } What is it about these lines of code that make the app render correctly? - (void) Render { [self setNeedsDisplay]; //this sets up a deferred call to drawRect. } - (void)drawRect:(CGRect)rect { Thanks in advance for helping out a newbie!

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  • Dashcode newbie question: Change a button's label programmatically

    - by Koning Baard XIV
    Hi all! I'm new to Mac OS X Dashboard developement. Now, I have a button with id b_start. When that button is clicked, I want the label of the button to change to "Round". Now I have tried these, but none of them work: document.getElementById("b_start").label = "Round"; document.getElementById("b_start").text = "Round"; document.getElementById("b_start").innerText = "Round"; document.getElementById("b_start").object.setValue("Round"); document.getElementById("b_start").value = "Round"; Does anyone how I can change the button's label? Thanks in advance.

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  • Array pointer arithmetic question

    - by Konrad
    Is there a way to figure out where in an array a pointer is? Lets say we have done this: int nNums[10] = {'11','51','23', ... }; // Some random sequence int* pInt = nNums[4]; // Some index in the sequence. ... pInt++; // Assuming we have lost track of the index by this stage. ... Is there a way to determine what element index in the array pInt is 'pointing' to without walking the array again?

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  • Javascript/iframe/embed/object question

    - by thinkfuture
    OK, so here is my issue. I'm building a system which will allow people to embed lists of links on their pages. When the link is clicked, i'd like to use something like Lightview or Lightwindow to open it up over the whole window, not just in the iframe. I don't have access to the page that the user will be embedding this object into. Everything I've tried so far tells me that I can't open anything over the parent window, since I don't have access to it from the iframe or object, javacript security issue. However, I've seen sites that do that kind of overlay. so it must be possible. If anyone can point me to any resources that could help, that would be great. if it matters, i'm using Ruby on Rails... Thanks...chris

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  • Simple java regular expression replace question.

    - by Yang
    I have a simple xml file and I want to remove everything before the first tag. ..... item1 .... The following java code is not working: String cleanxml = rawxml.replace("^[\\s\\S]+<item>", ""); What is the correct way to do this? And how do I address the non-greedy issue? Sorry I'm a C# programmer.

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  • AJAX HTML PHP question

    - by Jordan Pagaduan
    This is my scripts.js function showHint(str) { if (str.length==0) { document.getElementById("txtHint").innerHTML=""; return; } if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("txtHint").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","inputProcess.php?q="+str,true); xmlhttp.send(); } This is my HTML <script type="text/javascript" src="scripts.js"></script> <form> Type your name here : <input type="text" onkeypress="showHint(this.value)" name="name" /> </form> This is my PHP file <?php $q = $_GET['q']; $dbc=mysql_connect("localhost","root","") or die (mysql_error()); mysql_select_db('input_oop') or die (mysql_error()); $sql = "INSERT INTO users set name = '".$q."'"; mysql_query($sql) or die (mysql_error()); ?> When the text is save in my database it will save 5 times or up.

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  • VoiceXML Prompt & SSML <mark> element. How to read prompt from the specified position?

    - by EugeneP
    <mark> element informs that reading went on to some point. But is there a way we could read the prompt again from the specified position returned by mark (name) id? It could be useful in such a scenario: we are reading a long text. Then the user commands: PAUSE. We stop. Then the user would say "Go on". And we continue to read the prompt from the last position. IS that possible at all? And I would ask yet another question. No matter with the usage of SSML or not: How to make it work - pause the prompt reading and then continue from the position where we stopped? Pause means "take full control over that pause", so that we could continue whenever we wanted. Dynamically.

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  • ruby comma operator and step question

    - by ryan_m
    so, i'm trying to learn ruby by doing some project euler questions, and i've run into a couple things i can't explain, and the comma ?operator? is in the middle of both. i haven't been able to find good documentation for this, maybe i'm just not using the google as I should, but good ruby documentation seems a little sparse . . . 1: how do you describe how this is working? the first snippet is the ruby code i don't understand, the second is the code i wrote that does the same thing only after painstakingly tracing the first: #what is this doing? cur, nxt = nxt, cur + nxt #this, apparently, but how to describe the above? nxt = cur + nxt cur = nxt - cur 2: in the following example, how do you describe what the line with 'step' is doing? from what i can gather, the step command works like (range).step(step_size), but this seems to be doing (starting_point).step(ending_point, step_size). Am i right with this assumption? where do i find good doc of this? #/usr/share/doc/ruby1.9.1-examples/examples/sieve.rb # sieve of Eratosthenes max = Integer(ARGV.shift || 100) sieve = [] for i in 2 .. max sieve[i] = i end for i in 2 .. Math.sqrt(max) next unless sieve[i] (i*i).step(max, i) do |j| sieve[j] = nil end end puts sieve.compact.join(", ")

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  • MySQL Stored Procedures not working with SELECT (basic question)

    - by TMG
    Hello, I am using a platform (perfectforms) that requires me to use stored procedures for most of my queries, and having never used stored procedures, I can't figure out what I'm doing wrong. The following statement executes without error: DELIMITER // DROP PROCEDURE IF EXISTS test_db.test_proc// CREATE PROCEDURE test_db.test_proc() SELECT 'foo'; // DELIMITER ; But when I try to call it using: CALL test_proc(); I get the following error: #1312 - PROCEDURE test_db.test_proc can't return a result set in the given context I am executing these statements from within phpmyadmin 3.2.4, PHP Version 5.2.12 and the mysql server version is 5.0.89-community. When I write a stored procedure that returns a parameter, and then select it, things work fine (e.g.): DELIMITER // DROP PROCEDURE IF EXISTS test_db.get_sum// CREATE PROCEDURE test_db.get_sum(out total int) BEGIN SELECT SUM(field1) INTO total FROM test_db.test_table; END // DELIMITER ; works fine, and when I call it: CALL get_sum(@t); SELECT @t; I get the sum no problem. Ultimately, what I need to do is have a fancy SELECT statement wrapped up in a stored procedure, so I can call it, and return multiple rows of multiple fields. For now I'm just trying to get any select working. Any help is greatly appreciated.

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  • Oneliner-question

    - by sid_com
    I proudly present a solution to the problem: perl -00 -F"\n" -anE '$_ = ( split / /, $F[1] )[0]; if ( !/error/ ) { $sum += $_; $c++ } } { say $sum / $c' file The problem: the first field of the second line of each paragraph if it is not error. How could I do this without the paragraph-mode? perl -anE 'say $F[0] if not /error/ and the second /\S+/ after /^$/' file

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  • Java Framework Choice Question.

    - by Sarang
    We do have many frameworks available in Java. Struts, Swing, JSF 2.0, Spring etc are used as per their priority. Actually, I don't know how many they are as well! But, as I am fresher to Java, even learning after their architecture, I cannot decide which framework can be used with what type of Projects ! Also, I am confused with mixed use of framework like Spring + JSF. What is the benefit to it ? Another thing making me confusing is about the UI components available in market. Like, we do have Primefaces, Ice-faces, MyFaces, Rich-faces. They may or may not have been supporting AJAX in-built. They may contains some bugs as well. What is best choice for Framework + UI component that can directly provide a best feet solution for any project ?

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  • Genetics algorithms theoretical question

    - by mandelart
    Hi All! I'm currently reading "Artificial Intelligence: A Modern Approach" (Russell+Norvig) and "Machine Learning" (Mitchell) - and trying to learn basics of AINN. In order to understand few basic things I have two 'greenhorn' questions: Q1: In a genetic algorithm given the two parents A and B with the chromosomes 001110 and 101101, respectively, which of the following offspring could have resulted from a one-point crossover? a: 001101 b: 001110 Q2: Which of the above offspring could have resulted from a two-point crossover? and why? Please advise.

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  • django sync db question

    - by Hulk
    In django models say this model exist in details/models.py class OccDetails(models.Model): title = models.CharField(max_length = 255) occ = models.ForeignKey(Occ) So when sync db is made the following fields get created and later to this of two more fields are added and sync db is made the new fields doesnt get created.How is this to be solved,Also what is auto_now=true in the below these are the new fields created_date = models.DateTimeField(auto_now_add=True) modified_date = models.DateTimeField(auto_now_add=True, auto_now=True)

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  • question about c# asp.net

    - by daddyCool
    in order to use the FolderBrowserDialog control in asp.net, i had to add a reference to System.Windows.Forms in my project. i wrote this code: FolderBrowserDialog f = new FolderBrowserDialog(); f.ShowDialog(); but this error occured: Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process. any help?

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  • [Flex Beginner question] String and value object

    - by James
    Hi all, In php we can assign a method name to a variable and then use that variable to call the method. For example: $image_create_func = 'ImageCreateFromGIF'; $newImage = $image_create_func($oldImage); But can we do this in Flex? In flex, I have the string public var key:String = "email" And I also have a value object searchTerm:SearchTermVO which has a public property "email" (searchTerm.email). Now I want to do searchTerm.email by doing something like in php: searchTerm.key but it's not possible. Can anybody help me with this plz? Thank you.

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  • YAQ: Yet Another Question

    - by Jerome WAGNER
    When you have to code something, you can either : start from scratch (Yet Another approach) fork another existing project participate in an existing project to add the features you miss What do you think are the keys aspects that make you choose option 1, 2 or 3 ?

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  • MySQL database design question

    - by Greelmo
    I'm trying to weigh the pros and cons of a database design, and would like to get some feedback as to the best approach. Here is the situation: I have users of my system that have only a few required items (username, password). They can then supply a lot of optional information. This optional information continues to grow as the system grows, so I want to do it in such a way that adding new optional information is easy. Currently, I have a separate table for each piece of information. For example, there's a table called 'names' that holds 'user_id', 'first_name', and 'last_name'. There's 'address', 'occupation', etc. You get the drift. In most cases, when I talk to my database, I'm looking only for users with one particular qualifier (name, address, etc.). However, there are instances when I want to see what information a user has set. The 'edit account' page, for example, must run queries for each piece of information it wants. Is this wasteful? Is there a way I can structure my queries or my database to make it so I never have to do one query for each piece of information like that without getting my tables to huge? If i want to add 'marital status', how hard will that be if I don't have a one-table-per-attribute system? Thanks in advance.

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  • Question regarding XST bitstream generation

    - by Richi
    Hi all, I have a very simple VHDL module, consisting of a few lines of code. The thing is, when I generate the bitstream, I end up with a huge bitstream. The reason for this is, I guess, that XST adds lots of extra information so that the bitstream can run standalone on a FPGA. However, for my purpose it would be interesting to see the size of the bitstream of the module alone without any extra bits and pieces, just the vaniall module alone. Is there an option in Xilinx ISE 12.1 that allows me to do that? Many thanks, Richi

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  • min() and max() give error: TypeError: 'float' object is not iterable

    - by PythonUser3.3
    markList=[] Lmark=0 Hmark=0 while True: mark=float(input("Enter your marks here(Click -1 to exit)")) if mark == -1: break markList.append(mark) markList.sort() mid = len(markList)//2 if len(markList)%2==0: median=(markList[mid]+ markList[mid-1])/2 print("Median:", median) else: print("Median:" , markList[mid]) Lmark==(min(mark)) print("The lowest mark is", Lmark) Hmark==(max(mark)) print("The highest mark is", Hmark) My program is a basic grade calculator using lists. My program asks the user to input their grades into a list in which it then calculates your average and finds your lowest and highest mark. I have found the average but I can't seem to figure out how to find the lowest and highest grade. Can you please show me pr tell me what to do?

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  • Applying policy based design question

    - by Arthur
    I've not read the Modern C++ Design book but have found the idea of behavior injection through templates interesting. I am now trying to apply it myself. I have a class that has a logger that I thought could be injected as a policy. The logger has a log() method which takes an std::string or std::wstring depending on its policy: // basic_logger.hpp template<class String> class basic_logger { public: typedef String string_type; void log(const string_type & s) { ... } }; typedef basic_logger<std::string> logger; typedef basic_logger<std::wstring> wlogger; // reader.hpp template<class Logger = logger> class reader { public: typedef Logger logger_type; void read() { _logger.log("Reading..."); } private: logger_type _logger; }; Now the questing is, should the reader take a Logger as an argument, like above, or should it take a String and then instantiate a basic_logger as an instance variable? Like so: template<class String> class reader { public: typedef String string_type; typedef basic_logger<string_type> logger_type; // ... private: logger_type _logger; }; What is the right way to go?

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  • jQuery Drag and Drop Checking Question

    - by Kim
    i am new to using jQuery and I just want to know how I can check whether a draggable object has been removed from the droppable object. Example, i have a dog and I dragged it to a doghouse which has a lightbulb that will light up indicating that the dog is there. When i drag the dog out of the doghouse, the lightbulb should go off again indicating the dog's absence. Help me please coz I really don't have any idea how to do this. Thanks in advance. :)

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