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• Reflection for a Field going wrong

  - by TiGer

  Hi, I have been trying to use reflection for a specifiec Field in the android.os.build class, the MANUFACTURER field... I have tried by using this code : try { Class myBuildClass = android.os.Build.class; Field m1 = Build.class.getDeclaredField("MANUFACTURER"); validField = true; manufacturer = Build.MANUFACTURER; } catch(Exception ex) { manufacturer = Build.PRODUCT; System.err.println("getDeviceSpecifics, got an exception during getting Field : " + ex.toString()); } I am gettign the following errors : 06-01 11:26:37.639: WARN/dalvikvm(7342): VFY: unable to resolve static field 2 (MANUFACTURER) in Landroid/os/Build; 06-01 11:26:37.639: WARN/dalvikvm(7342): VFY: rejecting opcode 0x62 at 0x0048 06-01 11:26:37.639: WARN/dalvikvm(7342): VFY: rejected Lmobilaria/android/managementModule/Management;.getDeviceSpecifics ()V 06-01 11:26:37.639: WARN/dalvikvm(7342): Verifier rejected class Lmobilaria/android/managementModule/Management; And when debugging I noticed that InvocationtargetException is continuesly thrown, so I am guessing I haven't been implementing the whole Reflection principle correctly... Any idea where things are going wrong or otherwise on how to implement Refelction for a single Field correctly ?

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• An "elegant" way of identifying a field?

  - by Alix

  Hi. I'm writing a system that underlies programmer applications and that needs to detect their access to certain data. I can mostly do so with properties, like this: public class NiceClass { public int x { get; set; } } Then I go in and tweak the get and set accessors so that they handle the accesses appropriately. However this requires that the users (application programmers) define all of their data as properties. If the users want to use pre-existing classes that have "normal" fields (as opposed to properties), I cannot detect those accesses. Example: public class NotSoNiceClass { public int y; } I cannot detect accesses to y. However, I want to allow the use of pre-existing classes. As a compromise the users are responsible for notifying me whenever an access to that kind of data occurs. For example: NotSoNiceClass notSoNice; ... Write(notSoNice.y, 0); // (as opposed to notSoNice.y = 0;) Something like that. Believe me, I've researched this very thoroughly and even directly analysing the bytecode to detect accesses isn't reliable due to possible indirections, etc. I really do need the users to notify me. And now my question: could you recommend an "elegant" way to perform these notifications? (Yes, I know this whole situation isn't "elegant" to begin with; I'm trying not to make it worse ;) ). How would you do it? This is a problem for me because actually the situation is like this: I have the following class: public class SemiNiceClass { public NotSoNiceClass notSoNice { get; set; } public int z { get; set; } } If the user wants to do this: SemiNiceClass semiNice; ... semiNice.notSoNice.y = 0; They must instead do something like this: semiNice.Write("notSoNice").y = 0; Where Write will return a clone of notSoNice, which is what I wanted the set accessor to do anyway. However, using a string is pretty ugly: if later they refactor the field they'll have to go over their Write("notSoNice") accesses and change the string. How can we identify the field? I can only think of strings, ints and enums (i.e., ints again). But: We've already discussed the problem with strings. Ints are a pain. They're even worse because the user needs to remember which int corresponds to which field. Refactoring is equally difficult. Enums (such as NOT_SO_NICE and Z, i.e., the fields of SemiNiceClass) ease refactoring, but they require the user to write an enum per class (SemiNiceClass, etc), with a value per field of the class. It's annoying. I don't want them to hate me ;) So why, I hear you ask, can we not do this (below)? semiNice.Write(semiNice.notSoNice).y = 0; Because I need to know what field is being accessed, and semiNice.notSoNice doesn't identify a field. It's the value of the field, not the field itself. Sigh. I know this is ugly. Believe me ;) I'll greatly appreciate suggestions. Thanks in advance! (Also, I couldn't come up with good tags for this question. Please let me know if you have better ideas, and I'll edit them)

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• How to check if a field is an Image field

  - by AJ

  Hello, This might seem an easy question for some, but I am struggling with it. I am trying to use SQLDataReader.GetFieldType to check if a certain field is an Image field. Lets assume the first field of the result set is an Image field, if I do: reader.GetFieldType(0).ToString; I get System.Byte[] But is this the correct way to check for it? I really don't like: if (reader.GetFieldType(0).ToString="System.Byte[]") Is there a better way? Thanks, AJ

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• How to add a Drupal CCK Custom Field which supports unique identification of multiple values

  - by jtw12

  I need to create a custom field that supports multiple values which can be uniquely identified (beyond the delta field which changes when the values are re-ordered). I have created a module for the field and specified the two database columns that I would like CCK to use (one for the value and one for the ID) but I am not sure where the entry point is for adding in a unique id for each value (probably will just take the id from a sequence).

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• How to access a field's value via reflection (Scala 2.8)

  - by soc

  Consider the following code: class Foo(var name: String = "bar") Now i try to get the value and the correct type of it via reflection: val foo = new Foo val field = foo.getDeclaredField("name") field.setAccessible(true) //This is where it doesn't work val value = field.get(????) I tried things like field.get(foo), but that just returns an java.lang.Object but no String. Basically I need the correct type, because I want to invoke a method on it (e. g. toCharArray). What is the suggested way to do that?

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• Possible form field types per model field type

  - by Jonathan

  Django's documentation specifies for each model field type the corresponding default form field type. Alas, I couldn't find in the documentation, or anywhere else, what form field types are possible per model field type. Not all combinations are possible, right? Same question for widgets...

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• Cocoa: SBJSON check if field exists

  - by Matt S.

  How can I check if a field exists?

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• Prevent form field to be edited without disabling field

  - by Erick

  I am currently working on a page that has a date picker for one of the field. One of the requirements by my client is to prevent the user from editing the field manually. Only the date picker would be possible to be used. (jQuery DatePicker) I had in mind to disable the field and use an hidden field to store the data (disabled from object ton send data on post). This sounds a bit wacky for something that could be done by javascript I'm pretty sure. So the big question, in javascript is it possible to prevent manual edition of a field without stopping datepicker plugin?

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• c# reading integer fields from database, returning empty string when reading integer type field

  - by arnoldino

  what is wrong with this code? field="id"; table="MInvMonth"; condition="machine_id=37"; public static String getConditionedField(String field, String table, String condition) try { if (cmd == null) getConnection(); cmd.CommandText = "Select " + field + " from " + table + " where " + condition; SQLiteDataReader reader = cmd.ExecuteReader(); if (reader.HasRows==true) { reader.Read(); string s = reader[0].ToString(); // return first element reader.Close(); return s; } reader.Close(); return null; } catch (Exception e) { MessageBox.Show("Caught exception: " + e.Message+"|"+cmd.CommandText); return null; } I checked the sql statement, it turns the right value. why can't I read it? the returnvalue is "".

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• Reading int from a hidden field in .aspx

  - by vikp

  Hi, I'm struggling to read an int from the hidden field on aspx page. <input type = "hidden" id = "myIntegerId" name = "integerId" value= "<%: Model.MyObjectId %>" runat = "server" /> The value is definately on the form, I can see it in the debugger and print it with <%: % When I read the form values in the controller, instead of an int I recieve a following string: <%: Model.MyObjectId % I have tried casting data in the hidden field to string and calling ToString() method on that field, neither has worked. The data is submitted using the post event. I have a feeling that I'm missing something very basic... Any help is greately appreciated. Thanks

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• T-SQL Operations on a Calculated Date Field

  - by firedrawndagger

  Can I do WHERE operations on a calculated date field? I have a lookup field, which has been written badly in SQL and unfortunately I can't change it. But basically it stores dates as characters such as "July-2010" or "June-2009" (along with other non date data). I want to extract the dates first (which I did using a LIKE opertor) and then extract data based on a date range. SELECT BusinessUnit, Lookup, ReleaseDate FROM ( SELECT TOP 10 LookupColumn As Lookup, BU as BusinessUnit, CONVERT(DATETIME, REPLACE(LookupColumn,'-',' ')) as ReleaseDate FROM [dbo].[LookupTable] WHERE LookupColumn LIKE N'%-2010' ) MyTable ORDER BY ReleaseDate WHERE ReleaseDate = '2010-02-01' I'm having issues with WHERE operator. I would assume creating a subquery to encapsulate the calculated field would allow me to do operations with it such as WHERE but maybe I'm wrong. Bottom line is it possible to do operations on calculated fields?

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• GetValue on static field inside nested classes.

  - by Sir Gallahad

  Hi... I have the following class declared. I need to retreive the class structure and the static values without instanciate it. public MyClass() { public static string field = "Value"; public nestedClass() { public static string nestedField = "NestedValue"; } } I've successfuly used GetFields and GetNestedType to recover the class structure and GetValue(null) works fine on field, but not on nestedField. Let me sample: var fi = typeof(MyClass).GetField("field", BindingFlags.Public | BindingFlags.Static); var nt = typeof(MyClass).GetNestedType("nestedClass", BindingFlags.Public); var nfi = nt.GetField("nestedField", BindingFlags.Public | BindingFlags.Static); // All the above references are detected correctly var value = fi.GetValue(null); // until here everything works fine. value == "Value" var nestedValue = nfi.GetValue(null); // this one does not work!! Anyone knows why the last line does not work and how to work around? Thanks.

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• How to convert many-to-one XML data to DataSet?

  - by TruMan1

  I have an XML document that has a collection of objects. Each object has a key/value pair of label and value. I am trying to convert this into a DataSet, but when I do ds.ReadXml(xmlFile), then it creates two columns: label and value. What I would like is to have a column for each "label" and the value to be part of the row. here is my sample of the XML: <responses> <response> <properties id="1" Form="Account Request" Date="Tuesday, March 16, 2010 5:04:26 PM" Confirmation="True" /> <fields> <field> <label>Name</label> <value>John</value> </field> <field> <label>Email</label> <value>[email protected]</value> </field> <field> <label>Website</label> <value>http://domain1.com</value> </field> <field> <label>Phone</label> <value>999-999-9999</value> </field> <field> <label>Place of Birth</label> <value>Earth</value> </field> <field> <label>Misc</label> <value>Misc</value> </field> <field> <label>Comments</label> <value /> </field> <field> <label>Agree to Terms?</label> <value>True</value> </field> </fields> </response> <response> <properties id="2" Form="Account Request" Date="Tuesday, March 17, 2010 5:04:26 PM" Confirmation="True" /> <fields> <field> <label>Name</label> <value>John2</value> </field> <field> <label>Email</label> <value>[email protected]</value> </field> <field> <label>Website</label> <value>http://domain2.com</value> </field> <field> <label>Phone</label> <value>999-999-9999</value> </field> <field> <label>Place of Birth</label> <value>Earth</value> </field> <field> <label>Misc</label> <value>Misc</value> </field> <field> <label>Comments</label> <value /> </field> <field> <label>Agree to Terms?</label> <value>True</value> </field> </fields> </response> <response> <properties id="3" Form="Account Request" Date="Tuesday, March 18, 2010 5:04:26 PM" Confirmation="True" /> <fields> <field> <label>Name</label> <value>John3</value> </field> <field> <label>Email</label> <value>[email protected]</value> </field> <field> <label>Website</label> <value>http://domain3.com</value> </field> <field> <label>Phone</label> <value>999-999-9999</value> </field> <field> <label>Place of Birth</label> <value>Earth</value> </field> <field> <label>Misc</label> <value>Misc</value> </field> <field> <label>Comments</label> <value /> </field> <field> <label>Agree to Terms?</label> <value>True</value> </field> </fields> </response> <response> <properties id="4" Form="Account Request" Date="Tuesday, March 19, 2010 5:04:26 PM" Confirmation="True" /> <fields> <field> <label>Name</label> <value>John</value> </field> <field> <label>Email</label> <value>[email protected]</value> </field> <field> <label>Website</label> <value>http://domain4.com</value> </field> <field> <label>Phone</label> <value>999-999-9999</value> </field> <field> <label>Place of Birth</label> <value>Earth</value> </field> <field> <label>Misc</label> <value>Misc</value> </field> <field> <label>Comments</label> <value /> </field> <field> <label>Agree to Terms?</label> <value>True</value> </field> </fields> </response> </responses> How would I convert this to a DataSet so that I can load it into a gridview with the columns: Name, Email, Website, Phone, Place of Birth, Misc, Comments, and Agree to Terms? Then row 1 would be: John, [email protected], http://domain1.com, 999-999-9999, Earth, Misc, , True How can I do this with the XML provided?

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• When your field-terminating char appears within field values

  - by Jonathan Sampson

  I've had a very colorful morning learning the innerparts of Linux's sort command, and have come across yet another issue that I can't seem to find an answer for in the documentation. I'm currently using -t, to indicate that my fields are split by the comma character, but I'm finding that in some of my files, the comma is used (between double-quotes) within values: Jonathan Sampson,,[email protected],0987654321 "Foobar CEO,","CEO,",[email protected],, How can I use a comma to terminate my fields, but ignore the occurences of it within values? Is this fairly simple, or do I need to re-export all of my data using a more-foreign field-terminator?

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• SQL SERVER – Backing Up and Recovering the Tail End of a Transaction Log – Notes from the Field #042

  - by Pinal Dave

  [Notes from Pinal]: The biggest challenge which people face is not taking backup, but the biggest challenge is to restore a backup successfully. I have seen so many different examples where users have failed to restore their database because they made some mistake while they take backup and were not aware of the same. Tail Log backup was such an issue in earlier version of SQL Server but in the latest version of SQL Server, Microsoft team has fixed the confusion with additional information on the backup and restore screen itself. Now they have additional information, there are a few more people confused as they have no clue about this. Previously they did not find this as a issue and now they are finding tail log as a new learning. Linchpin People are database coaches and wellness experts for a data driven world. In this 42nd episode of the Notes from the Fields series database expert Tim Radney (partner at Linchpin People) explains in a very simple words, Backing Up and Recovering the Tail End of a Transaction Log. Many times when restoring a database over an existing database SQL Server will warn you about needing to make a tail end of the log backup. This might be your reminder that you have to choose to overwrite the database or could be your reminder that you are about to write over and lose any transactions since the last transaction log backup. You might be asking yourself “What is the tail end of the transaction log”. The tail end of the transaction log is simply any committed transactions that have occurred since the last transaction log backup. This is a very crucial part of a recovery strategy if you are lucky enough to be able to capture this part of the log. Most organizations have chosen to accept some amount of data loss. You might be shaking your head at this statement however if your organization is taking transaction logs backup every 15 minutes, then your potential risk of data loss is up to 15 minutes. Depending on the extent of the issue causing you to have to perform a restore, you may or may not have access to the transaction log (LDF) to be able to back up those vital transactions. For example, if the storage array or disk that holds your transaction log file becomes corrupt or damaged then you wouldn’t be able to recover the tail end of the log. If you do have access to the physical log file then you can still back up the tail end of the log. In 2013 I presented a session at the PASS Summit called “The Ultimate Tail Log Backup and Restore” and have been invited back this year to present it again. During this session I demonstrate how you can back up the tail end of the log even after the data file becomes corrupt. In my demonstration I set my database offline and then delete the data file (MDF). The database can’t become more corrupt than that. I attempt to bring the database back online to change the state to RECOVERY PENDING and then backup the tail end of the log. I can do this by specifying WITH NO_TRUNCATE. Using NO_TRUNCATE is equivalent to specifying both COPY_ONLY and CONTINUE_AFTER_ERROR. It as its name says, does not try to truncate the log. This is a great demo however how could I achieve backing up the tail end of the log if the failure destroys my entire instance of SQL and all I had was the LDF file? During my demonstration I also demonstrate that I can attach the log file to a database on another instance and then back up the tail end of the log. If I am performing proper backups then my most recent full, differential and log files should be on a server other than the one that crashed. I am able to achieve this task by creating new database with the same name as the failed database. I then set the database offline, delete my data file and overwrite the log with my good log file. I attempt to bring the database back online and then backup the log with NO_TRUNCATE just like in the first example. I encourage each of you to view my blog post and watch the video demonstration on how to perform these tasks. I really hope that none of you ever have to perform this in production, however it is a really good idea to know how to do this just in case. It really isn’t a matter of “IF” you will have to perform a restore of a production system but more of a “WHEN”. Being able to recover the tail end of the log in these sever cases could be the difference of having to notify all your business customers of data loss or not. If you want me to take a look at your server and its settings, or if your server is facing any issue we can Fix Your SQL Server. Note: Tim has also written an excellent book on SQL Backup and Recovery, a must have for everyone. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: Notes from the Field, PostADay, SQL, SQL Authority, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Field symbol and Data reference in SAP-ABAP

  - by PDP-21

  If we compare field symbol and data refernece with that of the pointer in C i concluded that :- In C language, Say we declare a variable "var" type "Integer" with default value "5". The variable "var" will be stored some where in the memory and say the memory address which holds this variable is "1000". Now we define a pointer "ptr" and this pointer is assigned to our variable. So, "&ptr" will be "1000" and " *ptr " will be 5. Lets comapre the above situation in SAP ABAP. Here we declare a Field symbol "FS" and assign that to the variable "var". Now my question is what "FS" holds ? I have searched this rigorously in the internet but found out many ABAP consultants have the opinion that FS holds the address of the variable i.e. 1000. But that is wrong. While debugging i found out that fs holds only 5. So fs (in ABAP) is equivalent to *ptr (in C). Please correct me if my understanding is wrong. Now lets declare a data reference "dref" and another filed symbol "fsym" and after creating the data reference we assign the same to field symbol . Now we can do operations on this field symbol. So the difference between data refernec and field symbol is :- in case of field symbol first we will declare a variable and assign it to a field symbol. in case of data reference first we craete a data reference and then assign that to field symbol. Then what is the use of data reference? The same functionality we can achive through field symbol also.

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• Changing the field height in a TFS field

  - by JohnB

  How can I change the height of a field in the TFS process template editor? If I stack two HTML type fields on top of each other the default rendering of the work item shows the first field about 20% and the second field about 80%.

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• SAS: rearrange field order in data step

  - by Dan

  In SAS 9, how can I in a simple data step, rearrange the order the field. Data set2; /*Something probably goes here*/ set set1; run; So if set1 has the following fields: Name Title Salary A Chief 40000 B Chief 45000 Then I can change the field order of set2 to: Title Salary Name Chief 40000 A Chief 45000 B Thanks, Dan

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• Display SharePoint lookup field on publishing website

  - by Slace

  A page within our MOSS publishing website has a property which is a lookup field. I only want the selected text to be displayed when you view the page not in edit mode, but when I use the Microsoft.SharePoint.WebControls.LookupField it generates a hyperlink to the SharePoint list item (obviously bad). Is there a way around this, short of creating my own lookup field control?

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• Remove Field Heading in Crystal Reports

  - by Juergen

  Hi, I have a crystal report designer problem: In my report is a field I want to display. But I don't want the field heading to be displayed. How can I suppress this? It looks like this: myFieldHeading FieldValue1 FieldValue2 FieldValue3 But I want just that: FieldValue1 FieldValue2 FieldValue3 How can I do that? bye juergen

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• How to test Text Field Validate a comma exists in a field

  - by user352860

  How to test input Field Validate a comma exists in a input field ?

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• Frederick .NET User Group June 2010 Meeting

  - by John Blumenauer

  FredNUG is pleased to announce our June speaker will be Pete Brown.  Pete was one FredNUG’s first speakers when the group started and we’re very happy to have him visiting us again to present on Silverlight!  On June 15th @ 6:30 PM, we’ll start with a Visual Studio 2010 Launch with pizza, swag and a presentation about what makes Visual Studio 2010 great.  Then, starting at 7 PM, Pete Brown will present “What’s New in Silverlight 4.”  It looks like a evening filled with newness!   The scheduled agenda is:   6:30 PM - 7:15 PM – Visual Studio 2010 Launch Event plus Pizza/Social Networking/Announcements 7:15 PM - 8:30 PM - Main Topic: What’s New in Silverlight 4 with Pete Brown  Main Topic:  What’s New in Silverlight 4? Speaker Bio: Pete Brown is a Senior Program Manager with Microsoft on the developer community team led by Scott Hanselman, as well as a former Microsoft Silverlight MVP, INETA speaker, and RIA Architect for Applied Information Sciences, where he worked for over 13 years. Pete's focus at Microsoft is the community around client application development (WPF, Silverlight, Windows Phone, Surface, Windows Forms, C++, Native Windows API and more). From his first sprite graphics and custom character sets on the Commodore 64 to 3d modeling and design through to Silverlight, Surface, XNA, and WPF, Pete has always had a deep interest in programming, design, and user experience. His involvement in Silverlight goes back to the Silverlight 1.1 alpha application that he co-wrote and put into production in July 2007. Pete has been programming for fun since 1984, and professionally since 1992. In his spare time, Pete enjoys programming, blogging, designing and building his own woodworking projects and raising his two children with his wife in the suburbs of Maryland. Pete's site and blog is at 10rem.net, and you can follow him on Twitter at http://twitter.com/pete_brown Twitter: http://twitter.com/pete_brown Facebook: http://www.facebook.com/pmbrown Pete is a founding member of the CapArea .NET Silverlight SIG. (Visit the CapArea. NET Silverlight SIG here )    8:30 PM - 8:45 PM – RAFFLE! Please join us and get involved in our .NET developers community!

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• Variable for the field name of mysql row result

  - by ana

  I'm retrieving a row with php from mysql and it has fields like: name_en, name_es, name_de... I want to retrieve the right field base on my $lang variable (en, es, de...). If the $lang variable is 'es', I'd need to get $row['name_es']. I've tried this (based on this thread), but it's not working: $name = $row->{'name_'.$lang}; Any idea how can I use a variable as the name of the field of a row? Thanks in advance for your help!

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• How to access a field's value in an object using reflection

  - by kentcdodds

  My Question: How to overcome an IllegalAccessException to access the value of a an object's field using reflection. Expansion: I'm trying to learn about reflection to make some of my projects more generic. I'm running into an IllegalAccessException when trying to call field.getValue(object) to get the value of that field in that object. I can get the name and type just fine. If I change the declaration from private to public then this works fine. But in an effort to follow the "rules" of encapsulation I don't want to do this. Any help would be greatly appreciated! Thanks! My Code: package main; import java.lang.reflect.Field; public class Tester { public static void main(String args[]) throws Exception { new Tester().reflectionTest(); } public void reflectionTest() throws Exception { Person person = new Person("John Doe", "555-123-4567", "Rover"); Field[] fields = person.getClass().getDeclaredFields(); for (Field field : fields) { System.out.println("Field Name: " + field.getName()); System.out.println("Field Type: " + field.getType()); System.out.println("Field Value: " + field.get(person)); //The line above throws: Exception in thread "main" java.lang.IllegalAccessException: Class main.Tester can not access a member of class main.Tester$Person with modifiers "private final" } } public class Person { private final String name; private final String phoneNumber; private final String dogsName; public Person(String name, String phoneNumber, String dogsName) { this.name = name; this.phoneNumber = phoneNumber; this.dogsName = dogsName; } } } The Output: run: Field Name: name Field Type: class java.lang.String Exception in thread "main" java.lang.IllegalAccessException: Class main.Tester can not access a member of class main.Tester$Person with modifiers "private final" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:95) at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:261) at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:253) at java.lang.reflect.Field.doSecurityCheck(Field.java:983) at java.lang.reflect.Field.getFieldAccessor(Field.java:927) at java.lang.reflect.Field.get(Field.java:372) at main.Tester.reflectionTest(Tester.java:17) at main.Tester.main(Tester.java:8) Java Result: 1 BUILD SUCCESSFUL (total time: 0 seconds)

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• What is @namespace field in C# class?

  - by MainMa

  Hi, I'm browsing the source code of StyleCop, and I found a curious thing: /// <summary> /// The namespace that the rule is contained within. /// </summary> private string @namespace; // [...] internal Rule(string name, string @namespace, string checkId, string context, bool warning) : this(name, @namespace, checkId, context, warning, string.Empty, null, true, false) { Param.Ignore(name, @namespace, checkId, context, warning); } What is this thing? Is it just a simple field where at-sign is used to indicate that it is a field, and not a namespace keyword? If so, may at-sign be used for any reserved word (for example @dynamic, @using, etc.)?

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