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• DropDownList and ViewData

  - by Petko Xyz

  In my controller I have: Category x = new Category(1, "prva", 0); Category y = new Category(2, "vtora", 1); Category z = new Category(3, "treta", 1); List<Category> categories = new List<Category>(); categories.Add(x); categories.Add(y); categories.Add(z); ViewData["categories"] = categories; And in my view I have: <%= Html.DropDownList("categories")%> But I have an error: The ViewData item that has the key 'categories' is of type 'System.Collections.Generic.List`1[[Category, MvcApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' but must be of type 'IEnumerable'. Uggggghhh how to resolve this?

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• wp e-commerce php modification

  - by user1015687

  Here are a few lines of code from a wordpress plugin (WP E-commerce) that calculate the price. Now what i want is that if 'cart_item' are more than 3 in quantity then the price should be (number of items * 4) else the function should work as it is listed below. Thnks for help. function calculate_subtotal($for_shipping = false) { 1047 global $wpdb; 1048 if($for_shipping == true ) { 1049 $total = 0; 1050 foreach($this->cart_items as $key => $cart_item) { 1051 if($cart_item->uses_shipping == 1) { 1052 $total += $cart_item->total_price; 1053 } 1054 } 1055 } else { 1056 $total = 0; 1057 if($this->subtotal == null) { 1058 foreach($this->cart_items as $key => $cart_item) { 1059 $total += $cart_item->total_price; 1060 } 1061 $this->subtotal = $total; 1062 } else { 1063 $total = $this->subtotal; 1064 } 1065 } 1066 return $total; 1067 }

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• Reading from a file into an array in c

  - by NaNa21

  My file contains a series of numbers (integer, float, integer, float ....), each written on a separate line. The numbers of columns are different from one line to another i.e. 1 2.45 3 1.75 5 3.45 7 2.55 9 3.25 6 1.75 4 3.55 6 2.55 9 2.45 The program should read the contents of the entire file and place the data into an array of type float with an entry for each line. Here is my basic solution, but this is only suitable if I have fixed no of columns. float Read(FILE *pFile) { char line[50]; char letter[5]; fi = fopen("file.txt", "r"); while (fgets(line,200,fi)!=NULL) { sscanf(line,"%f %f %f",&a[i], &a2[i],&a3[i]); printf("%2.0f %2.5f %2.0f\n",a[i],a2[i],a3[i]); } fclose(fi); return a[i]; } Please HELP.

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• C++ Static Array Initialization - Memory Issue

  - by donalmg

  Hi, I have a header file which contains a member variable declaration of a static char array: class ABC { public: static char newArray[4]; // other variables / functions private: void setArray(int i, char * ptr); } In the CPP file, I have the array initialized to NULL: char ABC::newArray[4] = {0}; In the ABC constructor, I need to overwrite this value with a value constructed at runtime, such as the encoding of an integer: ABC::ABC() { int i; //some int value defined at runtime memset(newArray, 0, 4); // not sure if this is necessary setArray(i,newArray); } ... void setArray(int i, char * value) { // encoding i to set value[0] ... value [3] } When I return from this function, and print the modified newArray value, it prints out many more characters than the 4 specified in the array declaration. Any ideas why this is the case. I just want to set the char array to 4 characters and nothing further. Thanks...

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• Exception for java Swing application?

  - by Rich Fluckiger

  For some reason this is locking up the java application. Did I handle the exception correctly? private void submitButtonActionPerformed(java.awt.event.ActionEvent evt) { double amount, interest,rateCalc, a, b, c, payment; int years, months; while (true){ try{ amount = Double.valueOf(loanAmount.getText()); interest = Double.valueOf(interestRate.getText()); years = Integer.valueOf(loanYears.getText()); rateCalc = (interest/12); months = (years*12); a = Math.pow((1+rateCalc),months); b = (a*rateCalc); c = (a-1); payment = (amount *(b/c)); monthlyPayment.setText("Mortgage Payment $ = " + payment); } catch (NumberFormatException nfe){ javax.swing.JOptionPane.showMessageDialog(null, "Please enter numbers and not letters"); return; } } } monthlyPayment returns to the java app.

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• How to assign one object to another in Linq c# without making new

  - by LLL

  I m facing issue in assiging one object to another in linq sql. In this example Func<result, result> make = q => new result { Id = q.Id, lName = q.lName, GroupId = q.GroupId, Age = (from tags in q.age where tags.Del == null && tags.lId == q.Id select age).ToEntitySet(), }; p = (from q in dc.results where q.Id == Id.Value select make(q)).First(); i am making new and assigning the object, but i dont want to do this, it will cause propblem in insertion. so i want to assign without making new, how is it possible?

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• [iphone] use NSString in other method?!

  - by user134282

  It's really embarrassing but i stuck on it for two hours of trial and error. I declared an NSString in the interface as: NSString *testString; Then i made a property and synthesized it. I allocate it in viewDidLoad with: testString = [[NSString alloc] initWithFormat:@"thats my value: %i", row]; If i want to get the value of the string in another method it always return (null). So the string is empty, but why? how do i make it accessible for every function inside of one class? So i don't want to make a global var just a "global variable inside the class" It's really confusing because as long as i code i never ran into this problem :( thanks a lot for helping me!

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• python array.array with strings as data type

  - by Gladius

  Is there an object that acts like array.array, yet can handle strings (or character arrays) as its data type? It should be able to convert the string array to binary and back again, preferably with null terminated strings, however fixed length strings would be acceptable. >>> my_array = stringarray(['foo', 'bar']) >>> my_array.tostring() 'foo\0bar\0' >>> re_read = stringarray('foo\0bar\0') >>> re_read[:] ['foo', 'bar'] I will be using it with arrays that contain a couple million strings.

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• Mysql with innodb and serializable transaction does not (always) lock rows

  - by Tobias G.

  Hello, I have a transaction with a SELECT and possible INSERT. For concurrency reasons, I added FOR UPDATE to the SELECT. To prevent phantom rows, I'm using the SERIALIZABLE transaction isolation level. This all works fine when there are any rows in the table, but not if the table is empty. When the table is empty, the SELECT FOR UPDATE does not do any (exclusive) locking and a concurrent thread/process can issue the same SELECT FOR UPDATE without being locked. CREATE TABLE t ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, display_order INT ) ENGINE = InnoDB; SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; START TRANSACTION; SELECT COALESCE(MAX(display_order), 0) + 1 from t FOR UPDATE; .. This concept works as expected with SQL Server, but not with MySQL. Any ideas on what I'm doing wrong? EDIT Adding an index on display_order does not change the behavior.

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• Getting MATLAB variable (string) from C

  - by Hamming

  Hi! I'm writing a small C application that launchs a Matlab script (.m file). I need to exchange some variables and I don't know how to get an array of chars that exists in Matlab. I'm doing something like this: enter code here result = engGetVariable(ep,"X"); if (!result) { printf ("Error..."); exit -1; } int n = mxGetN(result); char *varx = NULL; memcpy(varx, mxGetData(result),n*sizeof(char)); It doesn't work. Does someone know how to get a Matlab string in C? I've read Matlab documentation about engGetVariable() and the provided example but any of this things clarify me.

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• Creating a json obj from a string when working without a net connection?

  - by user246114

  Hi, I have a json object returned from a third party api, it looks like: {"version":"1.0","encoding":"UTF-8"} I'm going to be working on my project without a network connection, so I have to do everything locally. How can I create an instance of a json object locally for testing? Say I copy the above string, can I do something like: var json = null; if (debugging_locally) { json = new jsonObj('{"version":"1.0","encoding":"UTF-8"}'); } else { json = doAjaxCall(); } doStuffWithJsonObj(json); so I just want to create a json object from a stored string if debugging locally - how can I do that? Thanks

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• Can't remove a view included using a include tag

  - by Julio Rodrigues

  Removing a view that was included using a <include> tag seems to have no effect. ViewGroup currentPersonContainer = (ViewGroup) root.findViewById(R.id.propria_pessoa_container); if (dto.occupation!= null) { . . . } else { root.removeView(currentPersonContainer); } After the root.removeView(currentPersonContainer); I can still find it in root and the view is still visible. How can I remove a view included in a xml layout resource file?

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• Implicit type conversion in DB/2 inserts?

  - by IronGoofy

  We're using SQL Inserts to insert some data via a script into DB/2 tables, e.g. CREATE TABLE TICKETS (TICKETID VARCHAR(10) NOT NULL); On my home installation, this statement works fine (note that I'm using an integer which is autoatically cast into a VarChar): INSERT INTO TICKETS (TICKETID) VALUES (1); while at my customer's site I get a type error. My question(s): Is this behavior version dependent? (I use a DB2 Express V9.7, while the customer has an Enterprise V9.5) Is there a config option to change the behavior? (I would like my home install to behave as close as possible as the production environment is going to be.)

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• Where is the 'indeterminate type'?

  - by Daniel

  I'm defining the following type extension: type System.Reflection.MemberInfo with member x.GetAttribute<'T when 'T :> Attribute>(required, inherit') = match required, Attribute.GetCustomAttribute(x, typeof<'T>, inherit') with | true, null -> invalidOp (sprintf "Missing required attribute: %s" typeof<'T>.FullName) | _, attr -> attr :> 'T The last match expression (attr :> 'T) gives the error: The static coercion from Attribute to 'T involves an indeterminate type based on information prior to this program point. Static coercions are not allowed on some types. Further type annotations are needed. I've tried annotating the function return type, but got the same result. I would hate to change this to a dynamic cast. Is there a way to make the static cast work?

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• problem in playing next song in the avaudioplayer

  - by Rajashekar

  Hello friends my delegate method looks like this. after the first song is played it goes into this method and plays the second song , however when the second song is done playing it stops. it does not go into the delegate method.i need to play all the songs continuously. i am not sure, why. can someone help me. (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)p successfully:(BOOL)flag { if (flag == NO) NSLog(@"Playback finished unsuccessfully"); else { //[player stop]; index++; NSLog(@"%d",index); path=[[NSBundle mainBundle] pathForResource:[songlist objectAtIndex:index] ofType:@"mp3"]; [player initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; [songlabel2 setTitle:[songlist objectAtIndex:index]]; [endtime setText:[NSString stringWithFormat:@"%.2f",[player duration]/100]]; [player play]; } }

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• Form Closing help

  - by Michael Quiles

  How can I call the button1_Click event in the form closing event so I don't have to copy and paste the code from button1_Click? public void button1_Click(object sender, EventArgs e) { //Yes or no message box to exit the application DialogResult Response; Response = MessageBox.Show("Are you sure you want to Exit?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2); if (Response == DialogResult.Yes) // Exits the application Application.Exit(); } public void xGameThemeComboBox_SelectedIndexChanged(object sender, EventArgs e) { string folder = Application.StartupPath; string theme = (string)xGameThemeComboBox.Items[xGameThemeComboBox.SelectedIndex]; string path = System.IO.Path.Combine(folder, theme + ".jpg"); Image newImage = new Bitmap(path); if (this.BackgroundImage != null) this.BackgroundImage.Dispose(); { this.BackgroundImage = newImage; } } private void xGameForm_FormClosing(object sender, FormClosingEventArgs e) { // call button1_Click here }

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• extracting string occurrence in c

  - by David78

  I have a string from a text file that look something like this: long_str = "returns between paragraphs 20102/34.23" - 9203 1232 "test" "basic HTML" Note: Quotes are part of the string. int match(char *long_str){ char * str; if ((str = strchr(long_str, '"')) != NULL) str++; // last " ? else return 1; return 0; } Using strstr I'm trying to get the whole substring between the last two quotes: "basic HTML". I'm just not quite sure what would be a good and efficient way of getting that match. I'm open to any other ideas on how to approach this. Thanks

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• Are unspecified and undefined behavior required to be consistent between compiles?

  - by sharptooth

  Let's pretend my program contains a specific construct the C++ Standard states to be unspecified behavior. This basically means the implementation has to do something reasonable but is allowed not to document it. But is the implementation required to produce the same behavior every time it compiles a specific construct with unspecified behavior or is it allowed to produce different behavior in different compiles? What about undefined behavior? Let's pretend my program contains a construct that is UB according to the Standard. The implementation is allowed to exhibit any behavior. But can this behavior differ between compiles of the same program on the same compiler with same settings in the same environment? In other words, if I dereference a null pointer on line 78 in file X.cpp and the implementation formats the drive in such case does it mean that it will do the same after the program is recompiled?

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• Problems with mysql syntax

  - by user368453

  Hello everyone !! I´m trying to create a trigger on MySQL but I´m having a sintaxe problem, which I was not able to find. If someone more experient could help me it would be great (it´s the first time I use MySQL!)... The reason why I´m creating this trigger is for deleting all the orphan "labels", which has a many-to-many relation with "service_descriptor" (this two entities are linked by service_labels). The code I have is: CREATE TRIGGER trg_delete_orphan_label AFTER DELETE FOR EACH ROW ON restdb.service_labels DELETE FROM restdb.labels WHERE EXISTS (SELECT * FROM old D LEFT_JOIN restdb.service_labels SL ON SL.id_label = D.id_label AND D.id_service = SL.id_service WHERE SL.id_label IS NULL restdb.labels.id = D.SL.id_label ); Thanks in advance !

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• How to manage member variable in C++

  - by rhapsodyn

  In brief, my question is about member variables as pointers in unmanaged C++. In java or c#, we have "advanced pointer". In fact, we can't aware the "pointer" in them. We usually initialize the member of a class like this: member = new Member(); or member = null; But in c++, it becomes more confusing. I have seen many styles: using new, or leave the member variable in stack. In my point of view, using boost::shared_ptr seems friendly, but in boost itself source code there are news everywhere. It's the matter of efficiency,isn't it? Is there a guildline like "try your best to avoid new" or something?

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• Why is it inserting 0's instead of blank spaces into my DB using php?

  - by zeckdude

  I have an insert: $sql = 'INSERT into orders SET fax_int_prefix = "'.$_SESSION['fax_int_prefix'].'", fax_prefix = "'.$_SESSION['fax_prefix'].'", fax_first = "'.$_SESSION['fax_first'].'", fax_last = "'.$_SESSION['fax_last']; The value of all of these fields is that they are blank right before the insert. Here is an example of one of them I echo'd out just before the insert: $_SESSION[fax_prefix] = For some reason it inserts the integer 0, instead of a blank value or null, as it should. Why is it inserting 0's instead of blank spaces into my DB?

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• focus() jQuery function doesn't work in Safari, but works fine on all other browsers?

  - by pMan

  I have a search text field and search button, when button is clicked with default text in text field, or null value, an alert pops up and sets focus back on search text field. This works very well on all major browsers but not in safari. I tried it even with out jquery, but didn't work. When the focus falls on search text field, I have another jQuery function, is that the problem. The code that sets focus on search text is: if (defaults.keyword == SEARCH_TIP || defaults.keyword == '') { alert(SEARCH_NULL); $('#store_search_keyword').focus(); return false; } The code on focus is: var search_dom = $('#store_search_keyword'); var search_text = search_dom.val(); search_dom.focus(function(){ if ($(this).val() === SEARCH_TIP) { $(this).val(''); } }); any help is appreciated, thanks..

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• INSERT INTO othertbl SELECT * tbl

  - by Harry

  Current situation: INSERT INTO othertbl SELECT * FROM tbl WHERE id = '1' So i want to copy a record from tbl to othertbl. Both tables have an autoincremented unique index. Now the new record should have a new index, rather then the value of the index of the originating record else copying results in a index not unique error. A solution would be to not use the * but since these tables have quite some columns i really think it's getting ugly. So,.. is there a better way to copy a record which results in a new record in othertbl which has a new autoincremented index without having to write out all columns in the query and using a NULL value for the index. -hope it makes sense....-

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• this.Dispose() Don't release memory used by Form after Closing it .

  - by Ehab Sutan

  Hello, in C# Application. I've a windows form application in which clicking certain button make object from a 2nd Form. On closing this 2nd From by user Memory used by this form not released (from Task Manager). I Tried using this.dispose() on exit button ,tried this.close() , tried form2 =null in the main code ,and tried clearing all controls from this form by code before Disposing and every time the clicks the button memory usage by the application increases more and memory used by previous instance not released. What shall i use to solve this problem ?

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• How does OfType<T>() Work?

  - by TheCloudlessSky

  How does OfType() Work? I read this link about what's going on but how exactly does the LINQ provider know how to get all objects matching the specified type. I know the IQueryable<T> "chains" up requests and then evaluates when GetEnumerator() is called (right?). Specifically I want to know how does the framework quickly do type comparison? I wrote a method in a .NET 2.0 project that went like this (since 2.0 doesn't support these kind of features): public IEnumerable<TResult> OfType<TResult>() where TResult : class { foreach (TItem item in this.InnerList) { TResult matchItem = item as TResult; if (matchItem != null) { yield return matchItem; } } } Is this the best implementation?

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