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  • How to include a C array in -description

    - by bgw
    I'm trying to include the elements of an array in the NSString that's returned by the -description method in my class. No clue how to do this in Objective-C...in Java there's string concatenation or StringBuilder, what's the equivalent in Obj-C? TIA..

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  • fill array with binary numbers

    - by davit-datuashvili
    hi, first of all this is not homework!! my question is from book: Algorithms in C++ third edition by robert sedgewick question is: there is given array of size n by 2^n(two dimensional) and we should fill it by binary numbers with bits size exactly n or for example n=5 so result will be 00001 00010 00011 00100 00101 00110 00111 and so on we should put this sequence of bits into arrays please help me

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  • Search inside dynamic array in python

    - by user2091683
    I want to implement a code that loops inside an array that its size is set by the user that means that the size isn't constant. for example: A=[1,2,3,4,5] then I want the output to be like this: [1],[2],[3],[4],[5] [1,2],[1,3],[1,4],[1,5] [2,3],[2,4],[2,5] [3,4],[3,5] [4,5] [1,2,3],[1,2,4],[1,2,5] [1,3,4],[1,3,5] and so on [1,2,3,4],[1,2,3,5] [2,3,4,5] [1,2,3,4,5] Can you help me implement this code?

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  • removing comma from string array

    - by sarah
    Hi, I want to execute a query like select ID from "xyz_DB"."test" where user in ('a','b') so the corresponding code is like String s="("; for(String user:selUsers){ s+= " ' " + user + " ', "; } s+=")"; Select ID from test where userId in s; The following code is forming the value of s as ('a','b',) i want to remove the comma after the end of array how to do this ?

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  • Variable Length Array

    - by corinaf
    Hello, I would like to know how a variable length array is managed (what extra variables or data structures are kept on the stack in order to have variable length arrays). Thanks a lot.

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  • Reading file into array

    - by Asmsycool
    Hello, I have these a file in a c program which consist of a string and 4 doubles and 2 integer in one line and there is a total of 28 lines, i want to read this file and load the data into an array. can someone help me solve this.

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  • How do I tell mdadm to start using a missing disk in my RAID5 array again?

    - by Jon Cage
    I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine. When I had it all back together and ran up Ubuntu, I had some problems with disks not being detected. A couple of reboots later and I'd solved that issue. The problem now is that the 3-disk array is showing up as degraded every time I boot up. For some reason it seems that Ubuntu has made a new array and added the missing disk to it. I've tried stopping the new 1-disk array and adding the missing disk, but I'm struggling. On startup I get this: root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d1 : inactive sdf1[2](S) 1953511936 blocks md0 : active raid5 sdg1[2] sdc1[3] sdb1[1] sdh1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] I have two RAID arrays and the one that normally pops up as md1 isn't appearing. I read somewhere that calling mdadm --assemble --scan would re-assemble the missing array so I've tried first stopping the existing array that ubuntu started: root@uberserver:~# mdadm --stop /dev/md_d1 mdadm: stopped /dev/md_d1 ...and then tried to tell ubuntu to pick the disks up again: root@uberserver:~# mdadm --assemble --scan mdadm: /dev/md/1 has been started with 2 drives (out of 3). So that's started md1 again but it's not picking up the disk from md_d1: root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid5 sde1[1] sdf1[2] 3907023872 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU] md_d1 : inactive sdd1[0](S) 1953511936 blocks md0 : active raid5 sdg1[2] sdc1[3] sdb1[1] sdh1[0] 2930279808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] What's going wrong here? Why is Ubuntu trying to pick up sdd into a different array? How do I get that missing disk back home again? [Edit] - After adding the md1 to mdadm.conf it now tries to mount the array on startup but it's still missing the disk. If I tell it to try and assemble automatically I get the impression it know it needs sdd but can't use it: root@uberserver:~# mdadm --assemble --scan /dev/md1: File exists mdadm: /dev/md/1 already active, cannot restart it! mdadm: /dev/md/1 needed for /dev/sdd1... What am I missing?

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  • object_getInstanceVariable works for float, int, bool, but not for double?

    - by Russel West
    I've got object_getInstanceVariable to work as here however it seems to only work for floats, bools and ints not doubles. I do suspect I'm doing something wrong but I've been going in circles with this. float myFloatValue; float someFloat = 2.123f; object_getInstanceVariable(self, "someFloat", (void*)&myFloatValue); works, and myFloatValue = 2.123 but when I try double myDoubleValue; double someDouble = 2.123f; object_getInstanceVariable(self, "someDouble", (void*)&myDoubleValue); i get myDoubleValue = 0. If I try to set myDoubleValue before the function eg. double myDoubleValue = 1.2f, the value is unchanged when I read it after the object_getInstanceVariable call. setting myIntValue to some other value before the getinstancevar function above returns 2 as it should, ie. it has been changed. then I tried Ivar tmpIvar = object_getInstanceVariable(self, "someDouble", (void*)&myDoubleValue); if i do ivar_getName(tmpIvar) i get "someDouble", but myDoubuleValue = 0 still! then i try ivar_getTypeEncoding(tmpIvar) and i get "d" as it should be. So to summarize, if typeEncoding = float, it works, if it is a double, the result is not set but it correctly reads the variable and the return value (Ivar) is also correct. I must be doing something basic wrong that I cant see so I'd appreciate if someone could point it out.

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  • How do you safely wrap a JS string variable in double quote chars?

    - by incombinative
    Obviously when you're creating an actual string literal yourself, you backslash escape the double quote characters yourself. var foo = "baz\"bat"; Just as you would with the handful of other control characters, like linebreaks and backslashes. var bar = "baz\\bat"; but when you already have a variable, and you're wrapping that existing variable in quote characters, there's some confusion. Obviously you have to escape any potential double quote characters that are in the string. (Assuming whatever system you're giving the explicitly quoted string to, needs to be able to parse them correctly. =) var doubleQuoteRe = /\"/g; var quoted = unquoted.replace(escaper, '\\\"'); However from there opinions diverge a little. In particular, according to some you also have to worry about escaping literal backslash characters in the variable. // now say i have a string bar, that has both single backslash character in it, // as well as a double-quote character in it. // the following code ONLY worries about escaping the double quote char. var quoted = bar.replace(doubleQuoteRe, '\\\"'); The above seems fine to me. But is there a problem im not seeing?

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  • C# Convert string to nullable type (int, double, etc...)

    - by Nathan Koop
    I am attempting to do some data conversion. Unfortunately, much of the data is in strings, where it should be int's or double, etc... So what I've got is something like: double? amount = Convert.ToDouble(strAmount); The problem with this approach is if strAmount is empty, if it's empty I want it to amount to be null, so when I add it into the database the column will be null. So I ended up writing this: double? amount = null; if(strAmount.Trim().Length>0) { amount = Convert.ToDouble(strAmount); } Now this works fine, but I now have five lines of code instead of one. This makes things a little more difficult to read, especially when I have a large amount of columns to convert. I thought I'd use an extension to the string class and generic's to pass in the type, this is because it could be a double, or an int, or a long. So I tried this: public static class GenericExtension { public static Nullable<T> ConvertToNullable<T>(this string s, T type) where T: struct { if (s.Trim().Length > 0) { return (Nullable<T>)s; } return null; } } But I get the error: Cannot convert type 'string' to 'T?' Is there a way around this? I am not very familiar with creating methods using generics.

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  • C#/.NET Little Pitfalls: The Dangers of Casting Boxed Values

    - by James Michael Hare
    Starting a new series to parallel the Little Wonders series.  In this series, I will examine some of the small pitfalls that can occasionally trip up developers. Introduction: Of Casts and Conversions What happens when we try to assign from an int and a double and vice-versa? 1: double pi = 3.14; 2: int theAnswer = 42; 3:  4: // implicit widening conversion, compiles! 5: double doubleAnswer = theAnswer; 6:  7: // implicit narrowing conversion, compiler error! 8: int intPi = pi; As you can see from the comments above, a conversion from a value type where there is no potential data loss is can be done with an implicit conversion.  However, when converting from one value type to another may result in a loss of data, you must make the conversion explicit so the compiler knows you accept this risk.  That is why the conversion from double to int will not compile with an implicit conversion, we can make the conversion explicit by adding a cast: 1: // explicit narrowing conversion using a cast, compiler 2: // succeeds, but results may have data loss: 3: int intPi = (int)pi; So for value types, the conversions (implicit and explicit) both convert the original value to a new value of the given type.  With widening and narrowing references, however, this is not the case.  Converting reference types is a bit different from converting value types.  First of all when you perform a widening or narrowing you don’t really convert the instance of the object, you just convert the reference itself to the wider or narrower reference type, but both the original and new reference type both refer back to the same object. Secondly, widening and narrowing for reference types refers the going down and up the class hierarchy instead of referring to precision as in value types.  That is, a narrowing conversion for a reference type means you are going down the class hierarchy (for example from Shape to Square) whereas a widening conversion means you are going up the class hierarchy (from Square to Shape).  1: var square = new Square(); 2:  3: // implicitly convers because all squares are shapes 4: // (that is, all subclasses can be referenced by a superclass reference) 5: Shape myShape = square; 6:  7: // implicit conversion not possible, not all shapes are squares! 8: // (that is, not all superclasses can be referenced by a subclass reference) 9: Square mySquare = (Square) myShape; So we had to cast the Shape back to Square because at that point the compiler has no way of knowing until runtime whether the Shape in question is truly a Square.  But, because the compiler knows that it’s possible for a Shape to be a Square, it will compile.  However, if the object referenced by myShape is not truly a Square at runtime, you will get an invalid cast exception. Of course, there are other forms of conversions as well such as user-specified conversions and helper class conversions which are beyond the scope of this post.  The main thing we want to focus on is this seemingly innocuous casting method of widening and narrowing conversions that we come to depend on every day and, in some cases, can bite us if we don’t fully understand what is going on!  The Pitfall: Conversions on Boxed Value Types Can Fail What if you saw the following code and – knowing nothing else – you were asked if it was legal or not, what would you think: 1: // assuming x is defined above this and this 2: // assignment is syntactically legal. 3: x = 3.14; 4:  5: // convert 3.14 to int. 6: int truncated = (int)x; You may think that since x is obviously a double (can’t be a float) because 3.14 is a double literal, but this is inaccurate.  Our x could also be dynamic and this would work as well, or there could be user-defined conversions in play.  But there is another, even simpler option that can often bite us: what if x is object? 1: object x; 2:  3: x = 3.14; 4:  5: int truncated = (int) x; On the surface, this seems fine.  We have a double and we place it into an object which can be done implicitly through boxing (no cast) because all types inherit from object.  Then we cast it to int.  This theoretically should be possible because we know we can explicitly convert a double to an int through a conversion process which involves truncation. But here’s the pitfall: when casting an object to another type, we are casting a reference type, not a value type!  This means that it will attempt to see at runtime if the value boxed and referred to by x is of type int or derived from type int.  Since it obviously isn’t (it’s a double after all) we get an invalid cast exception! Now, you may say this looks awfully contrived, but in truth we can run into this a lot if we’re not careful.  Consider using an IDataReader to read from a database, and then attempting to select a result row of a particular column type: 1: using (var connection = new SqlConnection("some connection string")) 2: using (var command = new SqlCommand("select * from employee", connection)) 3: using (var reader = command.ExecuteReader()) 4: { 5: while (reader.Read()) 6: { 7: // if the salary is not an int32 in the SQL database, this is an error! 8: // doesn't matter if short, long, double, float, reader [] returns object! 9: total += (int) reader["annual_salary"]; 10: } 11: } Notice that since the reader indexer returns object, if we attempt to convert using a cast to a type, we have to make darn sure we use the true, actual type or this will fail!  If the SQL database column is a double, float, short, etc this will fail at runtime with an invalid cast exception because it attempts to convert the object reference! So, how do you get around this?  There are two ways, you could first cast the object to its actual type (double), and then do a narrowing cast to on the value to int.  Or you could use a helper class like Convert which analyzes the actual run-time type and will perform a conversion as long as the type implements IConvertible. 1: object x; 2:  3: x = 3.14; 4:  5: // if you want to cast, must cast out of object to double, then 6: // cast convert. 7: int truncated = (int)(double) x; 8:  9: // or you can call a helper class like Convert which examines runtime 10: // type of the value being converted 11: int anotherTruncated = Convert.ToInt32(x); Summary You should always be careful when performing a conversion cast from values boxed in object that you are actually casting to the true type (or a sub-type). Since casting from object is a widening of the reference, be careful that you either know the exact, explicit type you expect to be held in the object, or instead avoid the cast and use a helper class to perform a safe conversion to the type you desire. Technorati Tags: C#,.NET,Pitfalls,Little Pitfalls,BlackRabbitCoder

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  • Array help Index out of range exeption was unhandled

    - by Michael Quiles
    I am trying to populate combo boxes from a text file using comma as a delimiter everything was working fine, but now when I debug I get the "Index out of range exeption was unhandled" warning. I guess I need a fresh pair of eyes to see where I went wrong, I commented on the line that gets the error //Fname = fields[1]; using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Drawing.Printing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO; namespace Sullivan_Payroll { public partial class xEmpForm : Form { bool complete = false; public xEmpForm() { InitializeComponent(); } private void xEmpForm_Resize(object sender, EventArgs e) { this.xCenterPanel.Left = Convert.ToInt16((this.Width - this.xCenterPanel.Width) / 2); this.xCenterPanel.Top = Convert.ToInt16((this.Height - this.xCenterPanel.Height) / 2); Refresh(); } private void exitToolStripMenuItem_Click(object sender, EventArgs e) { //Exits the application this.Close(); } private void xEmpForm_FormClosing(object sender, FormClosingEventArgs e) //use this on xtrip calculator { DialogResult Response; if (complete == true) { Application.Exit(); } else { Response = MessageBox.Show("Are you sure you want to Exit?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2); if (Response == DialogResult.No) { complete = false; e.Cancel = true; } else { complete = true; Application.Exit(); } } } private void xEmpForm_Load(object sender, EventArgs e) { //file sources string fileDept = "source\\Department.txt"; string fileSex = "source\\Sex.txt"; string fileStatus = "source\\Status.txt"; if (File.Exists(fileDept)) { using (System.IO.StreamReader sr = System.IO.File.OpenText(fileDept)) { string dept = ""; while ((dept = sr.ReadLine()) != null) { this.xDeptComboBox.Items.Add(dept); } } } else { MessageBox.Show("The Department file can not be found.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } if (File.Exists(fileSex)) { using (System.IO.StreamReader sr = System.IO.File.OpenText(fileSex)) { string sex = ""; while ((sex = sr.ReadLine()) != null) { this.xSexComboBox.Items.Add(sex); } } } else { MessageBox.Show("The Sex file can not be found.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } if (File.Exists(fileStatus)) { using (System.IO.StreamReader sr = System.IO.File.OpenText(fileStatus)) { string status = ""; while ((status = sr.ReadLine()) != null) { this.xStatusComboBox.Items.Add(status); } } } else { MessageBox.Show("The Status file can not be found.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void xFileSaveMenuItem_Click(object sender, EventArgs e) { { const string fileNew = "source\\New Staff.txt"; string recordIn; FileStream outFile = new FileStream(fileNew, FileMode.Create, FileAccess.Write); StreamWriter writer = new StreamWriter(outFile); for (int count = 0; count <= this.xEmployeeListBox.Items.Count - 1; count++) { this.xEmployeeListBox.SelectedIndex = count; recordIn = this.xEmployeeListBox.SelectedItem.ToString(); writer.WriteLine(recordIn); } writer.Close(); outFile.Close(); this.xDeptComboBox.SelectedIndex = -1; this.xStatusComboBox.SelectedIndex = -1; this.xSexComboBox.SelectedIndex = -1; MessageBox.Show("your file is saved"); } } private void xViewFacultyMenuItem_Click(object sender, EventArgs e) { const string fileStaff = "source\\Staff.txt"; const char DELIM = ','; string Lname, Fname, Depart, Stat, Sex, Salary, cDept, cStat, cSex; double Gtotal; string recordIn; string[] fields; cDept = this.xDeptComboBox.SelectedItem.ToString(); cStat = this.xStatusComboBox.SelectedItem.ToString(); cSex = this.xSexComboBox.SelectedItem.ToString(); FileStream inFile = new FileStream(fileStaff, FileMode.Open, FileAccess.Read); StreamReader reader = new StreamReader(inFile); recordIn = reader.ReadLine(); while (recordIn != null) { fields = recordIn.Split(DELIM); Lname = fields[0]; Fname = fields[1]; // this is where the error appears Depart = fields[2]; Stat = fields[3]; Sex = fields[4]; Salary = fields[5]; Fname = fields[1].TrimStart(null); Depart = fields[2].TrimStart(null); Stat = fields[3].TrimStart(null); Sex = fields[4].TrimStart(null); Salary = fields[5].TrimStart(null); Gtotal = double.Parse(Salary); if (Depart == cDept && cStat == Stat && cSex == Sex) { this.xEmployeeListBox.Items.Add(recordIn); } recordIn = reader.ReadLine(); } reader.Close(); inFile.Close(); if (this.xEmployeeListBox.Items.Count >= 1) { this.xFileSaveMenuItem.Enabled = true; this.xFilePrintMenuItem.Enabled = true; this.xEditClearMenuItem.Enabled = true; } else { this.xFileSaveMenuItem.Enabled = false; this.xFilePrintMenuItem.Enabled = false; this.xEditClearMenuItem.Enabled = false; MessageBox.Show("Records not found"); } } private void xEditClearMenuItem_Click(object sender, EventArgs e) { this.xEmployeeListBox.Items.Clear(); this.xDeptComboBox.SelectedIndex = -1; this.xStatusComboBox.SelectedIndex = -1; this.xSexComboBox.SelectedIndex = -1; this.xFileSaveMenuItem.Enabled = false; this.xFilePrintMenuItem.Enabled = false; this.xEditClearMenuItem.Enabled = false; } } } Source file -- Anderson, Kristen, Accounting, Assistant, Female, 43155 Ball, Robin, Accounting, Instructor, Female, 42723 Chin, Roger, Accounting, Full, Male,59281 Coats, William, Accounting, Assistant, Male, 45371 Doepke, Cheryl, Accounting, Full, Female, 52105 Downs, Clifton, Accounting, Associate, Male, 46887 Garafano, Karen, Finance, Associate, Female, 49000 Hill, Trevor, Management, Instructor, Male, 38590 Jackson, Carole, Accounting, Instructor, Female, 38781 Jacobson, Andrew, Management, Full, Male, 56281 Lewis, Karl, Management, Associate, Male, 48387 Mack, Kevin, Management, Assistant, Male, 45000 McKaye, Susan, Management, Instructor, Female, 43979 Nelsen, Beth, Finance, Full, Female, 52339 Nelson, Dale, Accounting, Full, Male, 54578 Palermo, Sheryl, Accounting, Associate, Female, 45617 Rais, Mary, Finance, Instructor, Female, 27000 Scheib, Earl, Management, Instructor, Male, 37389 Smith, Tom, Finance, Full, Male, 57167 Smythe, Janice, Management, Associate, Female, 46887 True, David, Accounting, Full, Male, 53181 Young, Jeff, Management, Assistant, Male, 43513

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  • Is there a way to make 7zip temporarly uncompress the whole archive when double-clicking on an exe?

    - by Gnoupi
    In WinRAR, one feature which I like is the fact that you can set it to uncompress the whole archive in a temporary place, if you double-click on an .exe file inside the archive opened in WinRAR. Typically, I often download small games, which I just want to try, without the hassle of creating a folder for it, etc. Same for archives containing an installer with its own separate files. In the 7-zip window, if I double-click an exe, it will just extract the exe in a temporary location and launch it. In the small game context (or installer), it means that it will simply fail, because it will miss required files in the same folder. So my question is: Is there a way to make 7-zip extract the whole archive in a temporary folder when launching an exe from inside the archive?

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  • iPhone - archiving array of custom objects

    - by Dylan
    I've been trying for hours and I cannot solve this problem. I'm making an app that saves unfinished Chess Games, so I'm trying to write an array to a file. This is what the array is, if it makes sense: -NSMutableArray savedGames --GameSave a ---NSMutableArray board; ----Piece a, b, c, etc. -----some ints ---NSString whitePlayer, blackPlayer; ---int playerOnTop, turn; --GameSave b ---NSMutableArray board; ----Piece a, b, c, etc. -----some ints ---NSString whitePlayer, blackPlayer; ---int playerOnTop, turn; etc. And these are my NSCoding methods: GameSave.m - (void)encodeWithCoder:(NSCoder *)coder { [coder encodeObject:whitePlayer forKey:@"whitePlayer"]; [coder encodeObject:blackPlayer forKey:@"blackPlayer"]; [coder encodeInt:playerOnTop forKey:@"playerOnTop"]; [coder encodeInt:turn forKey:@"turn"]; [coder encodeObject:board forKey:@"board"]; } - (id)initWithCoder:(NSCoder *)coder { self = [[GameSave alloc] init]; if (self != nil) { board = [coder decodeObjectForKey:@"board"]; whitePlayer = [coder decodeObjectForKey:@"whitePlayer"]; blackPlayer = [coder decodeObjectForKey:@"blackPlayer"]; playerOnTop = [coder decodeIntForKey:@"playerOnTop"]; turn = [coder decodeIntForKey:@"turn"]; } return self; } Piece.m - (void)encodeWithCoder:(NSCoder *)coder { [coder encodeInt:color forKey:@"color"]; [coder encodeInt:piece forKey:@"piece"]; [coder encodeInt:row forKey:@"row"]; [coder encodeInt:column forKey:@"column"]; } - (id)initWithCoder:(NSCoder *)coder { self = [[Piece alloc] init]; if (self != nil) { color = [coder decodeIntForKey:@"color"]; piece = [coder decodeIntForKey:@"piece"]; row = [coder decodeIntForKey:@"row"]; column = [coder decodeIntForKey:@"column"]; } return self; } And this is the code that tries to archive and save to file: - (void)saveGame { ChessSaverAppDelegate *delegate = (ChessSaverAppDelegate *) [[UIApplication sharedApplication] delegate]; [[delegate gameSave] setBoard:board]; NSMutableArray *savedGames = [NSKeyedUnarchiver unarchiveObjectWithFile:[self dataFilePath]]; if (savedGames == nil) { [NSKeyedArchiver archiveRootObject:[delegate gameSave] toFile:[self dataFilePath]]; } else { [savedGames addObject:[delegate gameSave]]; [NSKeyedArchiver archiveRootObject:savedGames toFile:[self dataFilePath]]; } } - (NSString *)dataFilePath { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; return [documentsDirectory stringByAppendingPathComponent:@"gameSaves.plist"]; } Sorry, here's the problem: After setting some breakpoints, an error is reached after this line from -saveGame: [NSKeyedArchiver archiveRootObject:savedGames toFile:[self dataFilePath]]; And this is what shows up in the console: 2010-05-11 17:04:08.852 ChessSaver[62065:207] *** -[NSCFType encodeWithCoder:]: unrecognized selector sent to instance 0x3d3cd30 2010-05-11 17:04:08.891 ChessSaver[62065:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFType encodeWithCoder:]: unrecognized selector sent to instance 0x3d3cd30' 2010-05-11 17:04:08.908 ChessSaver[62065:207] Stack: ( 32339035, 31077641, 32720955, 32290422, 32143042, 238843, 25827, 238843, 564412, 342037, 238843, 606848, 17686, 2733061, 4646817, 2733061, 3140430, 3149167, 3144379, 2837983, 2746312, 2773089, 41684313, 32123776, 32119880, 41678357, 41678554, 2777007, 9884, 9738 ) If it matters, -saveGame is called from a UIBarButton in a navigation controller. Any help is appreciated, thanks.

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  • Jumbled byte array after using TcpClient and TcpListener

    - by Dylan
    I want to use the TcpClient and TcpListener to send an mp3 file over a network. I implemented a solution of this using sockets, but there were some issues so I am investigating a new/better way to send a file. I create a byte array which looks like this: length_of_filename|filename|file This should then be transmitted using the above mentioned classes, yet on the server side the byte array I read is completely messed up and I'm not sure why. The method I use to send: public static void Send(String filePath) { try { IPEndPoint endPoint = new IPEndPoint(Settings.IpAddress, Settings.Port + 1); Byte[] fileData = File.ReadAllBytes(filePath); FileInfo fi = new FileInfo(filePath); List<byte> dataToSend = new List<byte>(); dataToSend.AddRange(BitConverter.GetBytes(Encoding.Unicode.GetByteCount(fi.Name))); // length of filename dataToSend.AddRange(Encoding.Unicode.GetBytes(fi.Name)); // filename dataToSend.AddRange(fileData); // file binary data using (TcpClient client = new TcpClient()) { client.Connect(Settings.IpAddress, Settings.Port + 1); // Get a client stream for reading and writing. using (NetworkStream stream = client.GetStream()) { // server is ready stream.Write(dataToSend.ToArray(), 0, dataToSend.ToArray().Length); } } } catch (ArgumentNullException e) { Debug.WriteLine(e); } catch (SocketException e) { Debug.WriteLine(e); } } } Then on the server side it looks as follows: private void Listen() { TcpListener server = null; try { // Setup the TcpListener Int32 port = Settings.Port + 1; IPAddress localAddr = IPAddress.Parse("127.0.0.1"); // TcpListener server = new TcpListener(port); server = new TcpListener(localAddr, port); // Start listening for client requests. server.Start(); // Buffer for reading data Byte[] bytes = new Byte[1024]; List<byte> data; // Enter the listening loop. while (true) { Debug.WriteLine("Waiting for a connection... "); string filePath = string.Empty; // Perform a blocking call to accept requests. // You could also user server.AcceptSocket() here. using (TcpClient client = server.AcceptTcpClient()) { Debug.WriteLine("Connected to client!"); data = new List<byte>(); // Get a stream object for reading and writing using (NetworkStream stream = client.GetStream()) { // Loop to receive all the data sent by the client. while ((stream.Read(bytes, 0, bytes.Length)) != 0) { data.AddRange(bytes); } } } int fileNameLength = BitConverter.ToInt32(data.ToArray(), 0); filePath = Encoding.Unicode.GetString(data.ToArray(), 4, fileNameLength); var binary = data.GetRange(4 + fileNameLength, data.Count - 4 - fileNameLength); Debug.WriteLine("File successfully downloaded!"); // write it to disk using (BinaryWriter writer = new BinaryWriter(File.Open(filePath, FileMode.Append))) { writer.Write(binary.ToArray(), 0, binary.Count); } } } catch (Exception ex) { Debug.WriteLine(ex); } finally { // Stop listening for new clients. server.Stop(); } } Can anyone see something that I am missing/doing wrong?

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  • JRuby wrong element type class java.lang.String(array contains char) related to JAVA_HOME

    - by Daryl
    I am on Ubuntu x64 bit running: java version "1.6.0_18" OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-0ubuntu1) OpenJDK 64-Bit Server VM (build 14.0-b16, mixed mode) and jruby 1.4.0 (ruby 1.8.7 patchlevel 174) (2010-02-11 6586) (OpenJDK 64-Bit Server VM 1.6.0_18) [amd64-java] I have this code running on my Windows 7 computer at home. I recently copied over my whole folder over to Ubuntu, installed java, jruby, and associated gems but I get this error when I run my main file: jruby run.rb test =================Processing FREDERICKSBURG_1.1======================= ERROR IN TESTING wrong element type class java.lang.String(array contains char) /home/daryl/Desktop/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `to_java' /home/daryl/Desktop/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `split' /home/daryl/Desktop/work/Code/geografikos/lib/models/page.rb:103:in `sentences' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/lingpipe_svm.rb:34:in `extract' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:9:in `process' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `each' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `process' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `each' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `process' /home/daryl/Desktop/work/Code/geografikos/lib/statistics.rb:111:in `generate_all' /home/daryl/Desktop/work/Code/geografikos/lib/statistics.rb:105:in `each' /home/daryl/Desktop/work/Code/geografikos/lib/statistics.rb:105:in `generate_all' run.rb:56 The focus of the error is: ERROR IN TESTING wrong element type class java.lang.String(array contains char) Everything works fine on my windows machine. I figured I was getting this error because I did not have JAVA_HOME set however I added this to bashrc as: export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk and have confirmed: echo $JAVA_HOME /usr/lib/jvm/java-1.6.0-openjdk I can produce a similar error by removing my JAVA_HOME variable on windows: =================Processing FREDERICKSBURG_1.3======================= ERROR IN TESTING cannot convert instance of class org.jruby.RubyString to char C:/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `to_java' C:/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `split' C:/work/Code/geografikos/lib/models/page.rb:103:in `sentences' C:/work/Code/geografikos/lib/extractor/lingpipe_svm.rb:34:in `extract' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:9:in `process' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `each' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `process' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `each' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `process' C:/work/Code/geografikos/lib/statistics.rb:111:in `generate_all' C:/work/Code/geografikos/lib/statistics.rb:105:in `each' C:/work/Code/geografikos/lib/statistics.rb:105:in `generate_all' run.rb:56 It is obviously not exactly the same but I have a feeling this has to do with the java path. You can probably derive from the error that I am just trying to convert a ruby variable to java using to_java. This works fine on my windows machine and I have confirmed the gems are the same but I don't think this has to do with gems. I lied. I changed my JAVA_HOME back on my windows machine and this error still occurs. So now the code doesn't run on either machine. I recently installed git on my windows machine and added the code to a repository. But I haven't really done anything with it. All it said was it will convert all LF to CRLF...That shouldn't change anything though should it? Any ideas on why I am now getting these errors? I haven't changed anything on my windows machine in months except for installing git.

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  • changing value of a textview while change in other textview by multiplying

    - by sur007
    Here I am getting parsed data from a URL and now I am trying to change the value of parse data to users only dynamically on an text view and my code is package com.mokshya.jsontutorial; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.HashMap; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import com.mokshya.jsontutorialhos.xmltest.R; import android.app.AlertDialog; import android.app.ListActivity; import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.EditText; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; import android.widget.Toast; public class Main extends ListActivity { EditText resultTxt; public double C_webuserDouble; public double C_cashDouble; public double C_transferDouble; public double S_webuserDouble; public double S_cashDouble; public double S_transferDouble; TextView cashTxtView; TextView webuserTxtView; TextView transferTxtView; TextView S_cashTxtView; TextView S_webuserTxtView; TextView S_transferTxtView; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listplaceholder); cashTxtView = (TextView) findViewById(R.id.cashTxtView); webuserTxtView = (TextView) findViewById(R.id.webuserTxtView); transferTxtView = (TextView) findViewById(R.id.transferTxtView); S_cashTxtView = (TextView) findViewById(R.id.S_cashTxtView); S_webuserTxtView = (TextView) findViewById(R.id.S_webuserTxtView); S_transferTxtView = (TextView) findViewById(R.id.S_transferTxtView); ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>(); JSONObject json = JSONfunctions .getJSONfromURL("http://ldsclient.com/ftp/strtojson.php"); try { JSONArray netfoxlimited = json.getJSONArray("netfoxlimited"); for (inti = 0; i < netfoxlimited.length(); i++) { HashMap<String, String> map = new HashMap<String, String>(); JSONObject e = netfoxlimited.getJSONObject(i); map.put("date", e.getString("date")); map.put("c_web", e.getString("c_web")); map.put("c_bank", e.getString("c_bank")); map.put("c_cash", e.getString("c_cash")); map.put("s_web", e.getString("s_web")); map.put("s_bank", e.getString("s_bank")); map.put("s_cash", e.getString("s_cash")); mylist.add(map); } } catch (JSONException e) { Log.e("log_tag", "Error parsing data " + e.toString()); } ListAdapter adapter = new SimpleAdapter(this, mylist, R.layout.main, new String[] { "date", "c_web", "c_bank", "c_cash", "s_web", "s_bank", "s_cash", }, new int[] { R.id.item_title, R.id.webuserTxtView, R.id.transferTxtView, R.id.cashTxtView, R.id.S_webuserTxtView, R.id.S_transferTxtView, R.id.S_cashTxtView }); setListAdapter(adapter); final ListView lv = getListView(); lv.setTextFilterEnabled(true); lv.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view, int position, long id) { @SuppressWarnings("unchecked") HashMap<String, String> o = (HashMap<String, String>) lv .getItemAtPosition(position); Toast.makeText(Main.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show(); } }); resultTxt = (EditText) findViewById(R.id.editText1); resultTxt.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub resultTxt.setText(""); } }); resultTxt.addTextChangedListener(new TextWatcher() { public void afterTextChanged(Editable arg0) { // TODO Auto-generated method stub String text; text = resultTxt.getText().toString(); if (resultTxt.getText().length() > 5) { calculateSum(C_webuserDouble, C_cashDouble, C_transferDouble); calculateSunrise(S_webuserDouble, S_cashDouble, S_transferDouble); } else { } } public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub } public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub } }); } private void calculateSum(Double webuserDouble, Double cashDouble, Double transferDouble) { String Qty; Qty = resultTxt.getText().toString(); if (Qty.length() > 0) { double QtyValue = Double.parseDouble(Qty); double cashResult; double webuserResult; double transferResult; cashResult = cashDouble * QtyValue; webuserResult = webuserDouble * QtyValue; transferResult = transferDouble * QtyValue; DecimalFormat df = new DecimalFormat("#.##"); String cashResultStr = df.format(cashResult); String webuserResultStr = df.format(webuserResult); String transferResultStr = df.format(transferResult); cashTxtView.setText(String.valueOf(cashResultStr)); webuserTxtView.setText(String.valueOf(webuserResultStr)); transferTxtView.setText(String.valueOf(transferResultStr)); // cashTxtView.setFilters(new InputFilter[] {new // DecimalDigitsInputFilter(2)}); } if (Qty.length() == 0) { cashTxtView.setText(String.valueOf(cashDouble)); webuserTxtView.setText(String.valueOf(webuserDouble)); transferTxtView.setText(String.valueOf(transferDouble)); } } private void calculateSunrise(Double webuserDouble, Double cashDouble, Double transferDouble) { String Qty; Qty = resultTxt.getText().toString(); if (Qty.length() > 0) { double QtyValue = Double.parseDouble(Qty); double cashResult; double webuserResult; double transferResult; cashResult = cashDouble * QtyValue; webuserResult = webuserDouble * QtyValue; transferResult = transferDouble * QtyValue; DecimalFormat df = new DecimalFormat("#.##"); String cashResultStr = df.format(cashResult); String webuserResultStr = df.format(webuserResult); String transferResultStr = df.format(transferResult); S_cashTxtView.setText(String.valueOf(cashResultStr)); S_webuserTxtView.setText(String.valueOf(webuserResultStr)); S_transferTxtView.setText(String.valueOf(transferResultStr)); } if (Qty.length() == 0) { S_cashTxtView.setText(String.valueOf(cashDouble)); S_webuserTxtView.setText(String.valueOf(webuserDouble)); S_transferTxtView.setText(String.valueOf(transferDouble)); } } } and I am getting following error on logcat 08-28 15:04:12.839: E/AndroidRuntime(584): Uncaught handler: thread main exiting due to uncaught exception 08-28 15:04:12.848: E/AndroidRuntime(584): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mokshya.jsontutorialhos.xmltest/com.mokshya.jsontutorial.Main}: java.lang.NullPointerException 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.os.Handler.dispatchMessage(Handler.java:99) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.os.Looper.loop(Looper.java:123) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.ActivityThread.main(ActivityThread.java:4203) 08-28 15:04:12.848: E/AndroidRuntime(584): at java.lang.reflect.Method.invokeNative(Native Method) 08-28 15:04:12.848: E/AndroidRuntime(584): at java.lang.reflect.Method.invoke(Method.java:521) 08-28 15:04:12.848: E/AndroidRuntime(584): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 08-28 15:04:12.848: E/AndroidRuntime(584): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 08-28 15:04:12.848: E/AndroidRuntime(584): at dalvik.system.NativeStart.main(Native Method) 08-28 15:04:12.848: E/AndroidRuntime(584): Caused by: java.lang.NullPointerException 08-28 15:04:12.848: E/AndroidRuntime(584): at com.mokshya.jsontutorial.Main.onCreate(Main.java:111) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 08-28 15:04:12.848: E/AndroidRuntime(584): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)

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  • When is a>a true ?

    - by Cricri
    Right, I think I really am living a dream. I have the following piece of code which I compile and run on an AIX machine: AIX 3 5 PowerPC_POWER5 processor type IBM XL C/C++ for AIX, V10.1 Version: 10.01.0000.0003 #include <stdio.h> #include <math.h> #define RADIAN(x) ((x) * acos(0.0) / 90.0) double nearest_distance(double radius,double lon1, double lat1, double lon2, double lat2){ double rlat1=RADIAN(lat1); double rlat2=RADIAN(lat2); double rlon1=lon1; double rlon2=lon2; double a=0,b=0,c=0; a = sin(rlat1)*sin(rlat2)+ cos(rlat1)*cos(rlat2)*cos(rlon2-rlon1); printf("%lf\n",a); if (a > 1) { printf("aaaaaaaaaaaaaaaa\n"); } b = acos(a); c = radius * b; return radius*(acos(sin(rlat1)*sin(rlat2)+ cos(rlat1)*cos(rlat2)*cos(rlon2-rlon1))); } int main(int argc, char** argv) { nearest_distance(6367.47,10,64,10,64); return 0; } Now, the value of 'a' after the calculation is reported as being '1'. And, on this AIX machine, it looks like 1 1 is true as my 'if' is entered !!! And my acos of what I think is '1' returns NanQ since 1 is bigger than 1. May I ask how that is even possible ? I do not know what to think anymore ! The code works just fine on other architectures where 'a' really takes the value of what I think is 1 and acos(a) is 0.

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