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• PHP - MySQL how to delete an image when a user submits a new image problem.

  - by pc-wiki

  I'm trying to delete the current image that is already set on the server when a user submits a new image to the server, but I don't know how to do add this to my current code can some one please help me? Here is my PHP & MySQL code. if(isset($_FILES["thumb"]["name"])) { if (file_exists("/images/" . $_FILES["thumb"]["name"])) { $thumb != $_FILES["thumb"]["name"]; } else if($_FILES["thumb"]["name"] == TRUE) { move_uploaded_file($_FILES["thumb"]["tmp_name"], "/images/" . mysqli_real_escape_string($mysqli, htmlentities(strip_tags(basename($_FILES["thumb"]["name"]))))); $thumb = mysqli_real_escape_string($mysqli, htmlentities(strip_tags(basename($_FILES["thumb"]["name"])))); } if($thumb == TRUE) { //create thumb code here... } }

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• How to restrict this function from execution in android? Please help

  - by andyfan

  This code is present in one of this activity. I want to restrict addJoke() function from executing if the String variable new_joke is null, has no text or contains just spaces. Here is code protected void initAddJokeListeners() { // TODO m_vwJokeButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { //Implement code to add a new joke here... String new_joke=m_vwJokeEditText.getText().toString(); if(new_joke!=null&&new_joke!=""&&new_joke!=" ") { addJoke(new_joke); } } }); } I don't know why addJoke() function is getting executed even I don't enter any text in EditText field. Please help.

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• Why do C# and Java require everything to be in a class?

  - by Javier Badia

  It seemed like this question should have been asked before, but searching found nothing. I've always wondered what's the point of making us put every bit of code inside a class or interface. I seem to remember that there were some advantages to requiring a main() function like C, but nothing for classes. Languages like Python are, in a way, even more object oriented than Java since they don't have primitives, but you can put code wherever you want. Is this some sort of "misinterpretation" of OOP? After all, you can write procedural code like you would in C and put it inside a class, but it won't be object oriented.

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• Xcode can't find imported header files

  - by solerous

  I've used other IDE's in the past but am new to Xcode. I'm trying to bring in a bunch of C code from an open source project. I've imported them into a new Group and the .c files all show up under Implementation Files and the full list of files shows up in the Groups/Files group as well as my project directory in the finder. When I try to include or import one of these header files, code completion even works so I know Xcode is seeing them. But then when I go to build it says "no such file or directory". How can I get these files to import into my code?

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• Is there a way to set a DLL to always follow CultureInfo.InvariantCulture by default, if not specifi

  - by JL

  I have a lot of code in a class library that does not specify CultureInfo.InvariantCulture. For example in toString operations, toBool, toInt, etc. Is there a way I can get set a property for the class library to always execute using CultureInfo.InvariantCulture, even if it is not explicitly specified everywhere in the code? Sort of like a global switch? It is not only messy to have to explicitly type it everytime, it makes my code less readable, and is a royal pain for example: if (Convert.ToInt16(task.RetryCount, CultureInfo.InvariantCulture) < Convert.ToInt16(ConfigurationManager.AppSettings["TasksMaxRetry"], CultureInfo.InvariantCulture))

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• How do C++ header files work?

  - by PulpFiction

  Hi all. When I include some function from a header file in a C++ program, does the entire header file code get copied to the final executable or only the machine code for the specific function is generated. For example, if I call std::sort from the <algorithm> header in C++, is the machine code generated only for the sort() function or for the entire <algorithm> header file. I think that a similar question exists somewhere on Stack Overflow, but I have tried my best to find it (I glanced over it once, but lost the link). If you can point me to that, it would be wonderful.

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• Submit multiple forms as one

  - by Stephen Sarcsam Kamenar

  I have two forms on the page. To the user it looks like 1 form, and I actually wish it was one form. But the way I'm trying to reuse code and include things, I can't avoid two forms in the source code... trying to act as one. I don't want to do ajax submit, I want a normal post submit, my form handler has redirects in it. How can I submit both of these, and get values that make sense on the server side. something like $_POST['form1]['whatever'] $_POST['form2]['thing'] Maybe take all the inputs from form 2, rename all of them with a prefix, and append them to form 1? I can't find a non-messy way of doing this. I don't think I need code, just a plan. Least messy idea wins.

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• Can you have a web application project produce multiple DLLS?

  - by chris

  I have a VS 2008 web application project that is getting large. My structure looks like: - WebRoot - Common/ - Foo/ - Bar/ - Baz/ so I end up with a single Webroot.dll that contains the code for common, foo, bar, and baz. Is it possible to set it so that I end up with common/ in webroot.dll, and code in foo ends up in foo.dll, bar in bar.dll, etc? Update: A couple of suggestions to move some stuff into class libraries. We already have a dozen or so separate class library projects as part of the solution; Foo, Bar and Baz contain nothing but web forms and the associated code-behinds, so moving them into separate class library projects is not feasible.

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• Google Document export via API

  - by micco

  After using Zend_GData to retrieve a document list feed, I can use the content URLs in the form: http://docs.google.com/document/edit?id=<docid>&hl=en but the source URLs in the form http://docs.google.com/feeds/download/documents/Export?docId=<docid>&exportFormat=html are returning 404 errors. That URL should return the content of the document in the requested format but it is returning 404. This problem is mentioned without resolution on a Google API forum. As indicated in that forum post, this problem only seems to affect new documents. My code works perfectly retrieving old documents, but new ones are 404. Has something changed in the way Google references new documents or in the way permissions are assigned? The code I'm using is essentially the same as the code on this page but this does not seem to be an issue specific to PHP/Zend_Gdata.

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• calling a service layer method to my presentation layer

  - by Josepth Vodary

  Ok I feel really dumb asking this but I seem to be missing something really simple here. I have the following code in a class in my service layer - public Items getItems(String category, float amount, String color, String type) The code reads from a database and returns the results - I plan on placing it in a jframe. Nice and simple. But no matter how I call it from the jframe I get errors in eclipse that the code is wrong - either that their are illegal modifiers or such. So obviously I am calling it completely wrong, so my stupid question is how do you call that method into a jframe? For example - if I try to call it this way: public Items getItems(); I get told that getItems is an illegal parameter. If I call this.. Items getItems(); I am told its undefined

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• How long people take to learn a new programming language?

  - by Cawas

  In general aspects, this might be a good reference for everyone. Having an idea of how long people take in average for properly learning how to code can give a very good idea on how dense or long is the path. Someone who never programmed should take weeks or months, even years maybe while someone who's already experienced in the area and know at least 2 different languages might take days, hours or even minutes to start coding. But other than being able to write code that runs, there are ways to write the same program, and it's much harder to get deep knowledge on that than actually being able to program. And sometimes languages differ a lot from one to another on that aspect as well. For instance, we should never have to worry with code-injection in JavaScript like we do in C. So, is there any place we can see some good numbers for how long it takes to learn a language, maybe divided into level of knowledge categories, languages and paradigms, etc?

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• Why does OpenGL have to completely break backwards compatablity?

  - by directx

  I'm not sure if this only applies to JOGL or the entire OpenGL project in general. But there seems to be a vast difference between versions 3.x and 2.x; Code that works on one version will not work on another. It looks to me like the library designers intentionally renamed various classes, packages, and functions just to screw up the existing code. I've never seen anything like this before. The problem is I'm not sure which library to use now, and when looking at code it's not so easy to figure out whether it's supposed to run on 2.x or 3.x.

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• How to access function inside PHP OOP

  - by Industrial

  Hi everyone, What do I need to do to call $this-two() from inside my function innerOne? Is that possible with PHP OOP? Here's the error I am recieving: Fatal error: Using $this when not in object context Here's how my code looks: class myClass { function one(){ function innerOne() { // Some code $this->two($var1, $var2); } // Some code innerOne(); } function two($var1, $var2) { // Does magic with passed variables return $var1 . $var2; } } Thanks a lot!

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• can i have a date in the url of a route in asp.net ?

  - by oo

  This code below doesn't seem to work but i can't figure out why. If i have a user entered textbox that is a datepicker and the results are displayed as: 21-May-2010 , can i take this value and stick it into a URL to send over to a controller action so instead of an id (which is an int), i want a id which is a date value View / Javascript Code: $.get('/Tracker/DailyBlog/' + this.val(), function(data) { $('#dailyblog').html(data); }); ControllAction Code: public ActionResult DailyBlog(DateTime blogDate) { //go do something } any idea why this is not working ?

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• Waiting for a submitted job to finish in Oracle PL/SQL?

  - by vicjugador

  I'm looking for the equivalent of Java's thread.join() in PL/SQL. I.e. I want to kick off a number of jobs (threads), and then wait for them to finish. How is this possible in PL/SQL? I'm thinking of using dbms_job.submit (I know it's deprecated). dbms_scheduler is also an alternative. My code: DECLARE jobno1 number; jobno2 number; BEGIN dbms_job.submit(jobno1,'begin dbms_lock.sleep(10); dbms_output.put_line(''job 1 exit'');end;'); dbms_job.submit(jobno2,'begin dbms_lock.sleep(10); dbms_output.put_line(''job 2 exit'');end;'); dbms_job.run(jobno1); dbms_job.run(jobno2); //Need code to Wait for jobno1 to finish //Need code to Wait for jobno2 to finish END;

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• Using popen() to invoke a shell command?

  - by Anvar

  When running the following code through xcode I get inconsistent behavior. Sometimes it prints the git version correctly, other times it doesn't print anything. The return code from the shell command is always 0 though. Any ideas on why this might be? What am I doing wrong? #define BUFFER_SIZE 256 int main (int argc, const char * argv[]) { FILE *fpipe; char *command="/opt/local/bin/git --version"; char line[BUFFER_SIZE]; if ( !(fpipe = (FILE*)popen(command, "r")) ) { // If fpipe is NULL perror("Problems with pipe"); exit(1); } while ( fgets( line, sizeof(char) * BUFFER_SIZE, fpipe)) { // Inconsistent (happens sometimes) printf("READING LINE"); printf("%s", line); } int status = pclose(fpipe); if (status != 0) { // Never happens printf("Strange error code: %d", status); } return 0; }

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• Message box does not work in release mode

  - by Bi

  I have the following code in a C# windows form application. if (myGrid.Rows.Count != 0) { // do something } else { MessageBox.Show("Test"); } The message box shows up in Debug mode but not in release mode. Any idea why? I am having similar issues with other code as well For instance if (!myParameter) this.mycheckBox.Enabled = false; else this.mycheckBox.Enabled = true; The above code works in debug mode not in release. Not sure why. Thanks

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• More compact way to do this?

  - by Macha

  I have a couple of functions that loop around the surrounding cells of a cell. The grid is contained inside an array. In my code, I have checks to make sure it's not one of the edge cells, as checking an undefined cell causes an error. As such, I have code like this: if(x > 0) { var firstX = x - 1; } else { var firstX = x; } if(x < 199) { var lastX = x + 1; } else { var lastX = x; } if(y > 0) { var firstY = y - 1; } else { var firstY = y; } if(y < 199) { var lastY = y + 1; } else { var lastY = y; } A lot of lines of code to do very little. Is there a more elegant way to do this?

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• How to get the class of an input inside a jQuery each loop?

  - by Paul Atkins

  Hi, I have function which appends inputs inside a list item when a link is clicked. I then loop through these inputs using an each loop using the code below. It is working correctly as shown, however instead of using field.name I want to use the class of the input as the array key but when i try to do this the class is shown as undefined. Here is the code I am currently using: var values = {}; $.each($('li :input').serializeArray(), function(i, field) { values[field.name] = field.value; }); Here is the code I have inside the list item once I have appended the hidden inputs using jQuery append: <li><input type="hidden" name="group" class="group" value="2"/><input type="hidden" name="condition" class="condition" value="isany"/><input type="hidden" name="value" class="value" value="1,2"/></li> I can get the name attribute fine but class is always undefined. Could anybody help with this?

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• Why the data binding in this validation example works in WPF?

  - by MartyIX

  I'm wondering how exactly the XAML sample (MSDN sample) works: <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/> </Trigger> </Style.Triggers> </Style> Questions: (Validation.Errors)[0].ErrorContent - Is this code somehow checked by WPF? Because Validation.Errors may be an empty collection and in ordinary C# code this code may throw an exception. If this data-binding returns null for valid input - the null value is then casted to empty string (in a text control for example)? The index 0 corresponds to the first error message. How can I return more error messages from Validate method? Thank you for responses!

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• Should I be using libraries if I'm trying to learn how to program?

  - by CodeJustin.com

  I have been programming "a lot" in the past few months and at first I was trying to find the "easyest" language. Fortunately I realized that it's not about the language, it's about learning HOW to code. I ran into the Stanford lectures online (programming methodology) and I watched them all (around 23 hours total) awhile ago. Then I got into Java ME and programmed about 28.47% of a mobile RPG game (only around 2k lines of code). I feel like I learned a lot from those two experiences compared to previous ones but now that I'm moving into flash/actionscript 3.0 development and I'm finding myself learning like I did when I first started with PHP. I'm not really getting whats under the hood kind of. I'm finding myself using libraries to speed up development time which doesn't seem like a bad thing BUT I personally do not know how to write the libraries myself off hand. So should I be coding everything myself or is it ok to use libraries when you don't even know how to code them?

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• What would a compress method do in a hash table?

  - by Bradley Oesch

  For an assignment I have to write the code for a generic Hash Table. In an example Put method, there are two lines: int hash = key.hashCode(); // get the hashcode of the key int index = compress(hash); // compress it to an index I was of the understanding that the hashCode method used the key to return an index, and you would place the key/value pair in the array at that index. But here we "compress" the hash code to get the index. What does this method do? How does it "compress" the hash code? Is it necessary and/or preferred?

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• Activity.findViewById returning null sporadically

  - by adstro

  From the crash logs that I am getting from the Android market, I can see that some of my users are getting Force Closes caused by NullPointerExceptions when my code tries to access views that are in my application. In one example, my activity makes a call to findViewById() in onCreate() after I call setContentView(). I get an NPE when I try to access the view after the call to findViewById() (still in onCreate). What has me really scratching my head is that this does not happen all of the time (in fact most of the time the code acts as I would expect), but enough to have me concerned. I could add code to always check for null and avoid the NPE, but I would like to understand what could be causing the sporadic behavior. Does anyone know what could be causing this?

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• Can I get.seed() somehow?

  - by a different ben

  In reference to the statement set.seed(), can I get the seed instead after running some code if I didn't set it explicitly? I've been re-running some code containing a function that randomises some sample of the input data (the function is part of the kohonen package). After playing with it for some time to see the variety of output (it was an 'unstable' problem), I noticed one result that was pretty interesting. I of course had not used set.seed(), but wondered if I could get the seed after running the code to reproduce the result? In ?set.seed I see .Random.seed saves the seed set for the uniform random-number generator But I don't know how that helps.

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• a macro question for c language (#define)

  - by Daniel

  I am reading source code of hoard memory allocator, and in the file of gnuwrapper.cpp, there are the following code #define CUSTOM_MALLOC(x) CUSTOM_PREFIX(malloc)(x) What's the meaning of CUSTOM_PREFIX(malloc)(x)? is CUSTOM_PREFIX a function? But as a function it didn't defined anywhere. If it's variable, then how can we use variable like var(malloc)(x)? more code: #ifndef __GNUC__ #error "This file requires the GNU compiler." #endif #include <string.h> #include <stdlib.h> #include <stdio.h> #include <malloc.h> #ifndef CUSTOM_PREFIX ==> here looks like it's a variable, so if it doesn't define, then define here. #define CUSTOM_PREFIX #endif #define CUSTOM_MALLOC(x) CUSTOM_PREFIX(malloc)(x) ===> what's the meaning of this? #define CUSTOM_FREE(x) CUSTOM_PREFIX(free)(x) #define CUSTOM_REALLOC(x,y) CUSTOM_PREFIX(realloc)(x,y) #define CUSTOM_MEMALIGN(x,y) CUSTOM_PREFIX(memalign)(x,y)

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