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• Windows or Linux for VPN-VPN Bridge

  - by James

  I have the following network layout: Network1 ----VPN1-----Network2----VPN2----Network3 I can administer everything in Network1 only and my goal is to get to a box on Network3. I've been told by the admins of Network2 that it's not possible for them to route traffic from Network1 to Network3. I've finally been authorised to host a box in Network2 and I'm hoping with this I can set something up to resolve the issue. My question is should I set this up as a Windows or a Linux box. My initial thought was to use iptables to reroute requests but with my lack of experience with Windows Server (used for something or other in Network2) I'm not sure if this will work. My head's full of questions like: - can I get an ip without logging in to a windows domain? - if I do get an ip, do Windows Servers manage routing through the VPN? - can I make a linux box authenticate with Windows Server to log on to the domain? - would it just be easier to set up a windows box? - is it possible to configure a windows box to do routing from Network1 to Network3? Has anyone done anything like this before? Had experience managing Windows Server? Authenticated (or not as the case may be) to a Windows domain? I'd really appreciate your advice. It might be worth mentioning that the overall objective is to establish a telnet connection from a box on Network1 to a box on Network3.

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• How can I make my PCI-E graphics card visible to Ubuntu when the motherboard has integrated graphics

  - by Norman Ramsey

  I have a Gigabyte GA-MA74GM-S2 motherboard with integrated graphics that shows up on lspci as an ATI Radeon 2100. I also bought a PCI-Express Nvidia graphics card so I could use the VDPAU feature on Linux (plays H.264 in hardware). The BIOS has three settings about which display to initialize first: Integrated graphics PCI graphics PCI-Express graphics (PEG) I set the BIOS on PEG, but I cannot get anything, not even a splash screen or POST messages, to emerge from the PCI-Express graphics card. (I'm using a DVI connector; the card also has an HDMI output.) I cannot get the kernel lspci to see the graphics card; the only VGA controller it acknowledges is the integrated one. Running dmidecode acknowledges the existence of an x16 PCI Express slot, and it says Current usage: Unknown There is an additional BIOS setting called "Internal Graphics Mode" which is normally set to "Auto" which means it is supposed to prefer a PCI Express VGA card. I set it to "Disabled" which now means I'm getting no output at all. I will soon be learning how to do a BIOS reset! Other information: The PCI-E card is a MSI N210-MD512H GeForce 210. This is a fanless card. Although there are no fans to see turning, the heat sink on the PCI-E card is definitely getting hot, so the card is getting some sort of power. It gets all its power from the PCI-E slot; there is no external power connector. The BIOS is an AMI Award BIOS. My question: how can I make the PCI Express graphics card visible to Ubuntu?

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• Setting color in two different ways @*android:color/color1 vs @android:color/color1

  - by Pentium10

  I have seen this example: @*android:color/secondary_text_light What's that * asterisk doing there? What is the difference when using or not?

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• Parsing a given binary tree using python?

  - by kaushik

  Parse a binary tree,referring to given set of features,answering decision tree question at each node to decide left child or right child and find the path to leaf node according to answer given to the decision tree.. input wil be a set of feature which wil help in answering the question at each level to choose the left or right half and the output will be the leaf node.. i need help in implementing this can anyone suggest methods?? Please answer... thanks in advance..

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• long polling vs streaming for about 1 update/second

  - by jcee14

  is streaming a viable option? will there be a performance difference on the server end depending on which i choose? is one better than the other for this case? I am working on a GWT application with Tomcat running on the server end. To understand my needs, imagine updating the stock prices of several stocks concurrently.

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• Count(*) vs Count(1)

  - by Nai

  Hi, just wondering if any of you guys use Count(1) over Count(*) and if there is a noticeable difference for SQL Server 2005 in performance? Or is this just a legacy habit that has been brought forward from days gone past?

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• mysql.proc has gone corrupt. How can I fix it?

  - by Metalcoder

  I have a server running Debian 5.0, and MySQL. Suddendly, MySQL stopped working, and after many attempts to fix it, I decided to reinstall it. I installed MySQL 5.1.63, and when started it goes to safe mode. I made some typing, and when I executed mysql_upgrade as root, it complained: ... Running 'mysql_fix_privilege_tables'... ERROR 1548 (HY000) at line 1111: Cannot load from mysql.proc. The table is probably corrupted ERROR 1064 (42000) at line 1112: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'sqlstate 'HY000' set message_text='Unexpected content found in the performance_s' at line 1 ERROR 1548 (HY000) at line 1125: Cannot load from mysql.proc. The table is probably corrupted FATAL ERROR: Upgrade failed I checked the mysql.proc table, and it's comment column was slightly different from my backup. -- My backup says: `comment` char(64) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '', -- But it were: `comment` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL, So, I restored my mysql database backup, and now they all match, but mysql_upgrade still trigger the same errors. I also tried do check and repair the mysql.proc table, but got no success.

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• Private constructor and public parameter constructor -C#

  - by Amutha

  I heard that private constructor prevent object creation from outside world. When i have a code public class Product { public string Name { get;set;} public double Price {get;set;} Product() { } public Product(string _name,double _price) { } } here still i can declare public constructor(parameter),won't it spoil the purpose of private constructor? When do we need both private and public constructor(parameter) in code? I need detailed explanation please.

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• Breadcrumbs in CakePHP

  - by kicaj

  I use HtmlHelper from CakePHP to create breadcrumbs navigation for my page... And i set $html->getCrumbs('separator', 'Home Page') to default.ctp and in other views i set $html->addCrumbs('nameLink', 'linkUrl'); All works fine! But when I open my Home Page there is no breadcrumbs, why?

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• Setting zoom level on mobile browser

  - by Zbyszek Swirski

  I am designing website for mobile access and I want to set page width, height and button sizes, so they display filling up the screen. For example if user is using HTC HD , the whole screen would be 480x800 with button sized 240x200. However IE mobile as well as Opera load the page with some zoom level, so the buttons display either too large or too small. How can I either read current zoom level in javascript or set it from javascript?

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• Passing a custom variable to the PayPal API

  - by Michael

  Gday All, I am developing a site that uses PayPal to take online payments. I need to be able to send my client an email with the link to PayPal in order to pay. In this link I need a way to set a unique value (for example bookingId) that I can use to add the receipt number to the correct booking via PayPal's payment notification feature. Does anyone know what custom value I can set in order to achieve this? Cheers, Michael

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• sftp vs "FTP over SSH" c#

  - by sundar venugopal

  i am looking for sftp client in c# SSH File Transfer Protocol (SFTP) i come across http://sourceforge.net/projects/sharpssh http://granados.sourceforge.net/ after exploring i will use them. while trying to understand the basics. i come across the help text http://en.wikipedia.org/wiki/FTP_over_SSH#FTP_over_SSH_.28not_SFTP.29 which is confusing . could some one explain it for me what is difference between sftp and FTP over SSH. no library seems to give support for "FTP over SSH" if it is different.

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• ItemsControl ItemsTemplate vs ContentTemplate

  - by Allen Ho

  Hi, Is there any difference between setting the ContentTemplate of a ListBoxItem, compared to setting the ItemsTemplate on the ListBox? Or is it just a preference? Just say you set the ItemsTemplate of the ListBox can you still get the Data Template you assigned to the ListBox ItemsTemplate via the ListBoxItems ContentTemplate? ie. Like below ListBoxItem myListBoxItem = ...; ContentPresenter myContentPresenter = FindVisualChild(myListBoxItem); DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;

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• Setting tab size in Emacs

  - by Ryan

  I'm using Emacs as an editor. I want to set the tab size to four spaces. In my .emacs file I have the following: (setq default-tab-width 4) I've also tried: (set-default tab-width 4) Either way, when I open emacs and try to tab, it inserts two spaces. Am I doing something wrong? It almost seems like its not seeing my .emacs file. Any suggestions would be great! Thanks!

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• Failed to connect from slave to master with error "error connecting to master (1045)"

  - by Victor Lin

  I try to setup replication from slave to the master. CHANGE MASTER TO MASTER_HOST = 'master', MASTER_PORT = 3306, MASTER_USER = 'repl', MASTER_PASSWORD = 'xxx'; And I did grant privileges to the user on master. I can connect with mysql command from slave machine to the master mysql -h master -u repl -p mysql> show grants; GRANT RELOAD, SUPER, REPLICATION SLAVE, CREATE USER ON *.* TO 'repl'@'xxx' IDENTIFIED BY PASSWORD 'xxx' mysql> select 1; +---+ | 1 | +---+ | 1 | +---+ 1 row in set (0.04 sec) As you can see, privileges are correct, connection works fine, but however, the connection for replication to master always failed. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: Read_Master_Log_Pos: 4 Relay_Log_File: slave-replay-bin.000002 Relay_Log_Pos: 4 Relay_Master_Log_File: Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 0 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master:3306' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec) Is this caused by different version of MySQL server? The version of master is 5.0.77, and the slave is 5.5.13. But all articles I could find tell me that it's okay to replicate from a newer slave to old master. How to solve this problem? -- Update -- I even try to upgrade the old MySQL, but still, the problem is not solved. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000007 Read_Master_Log_Pos: 107 Relay_Log_File: slave-replay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: master-bin.000007 Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 107 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec)

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• VS Setup Project DefaultLocation for Application Folder

  - by user54064

  I am creating a Setup Project in VS 2008. The application needs to be supported on Windows 7 running UAC. I have to install the app in the User's area of the machine. What do I set the DefaultLocation property of the Application Folder to in the Setup Project? It can't be set to ProgramFilesFolder.

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• Ole atomation in c#

  - by Xaver

  I write vbs that create ole atomation object On Error Resume Next dim objShell dim objFolder if not objFolder is nothing then objFolder.CopyHere "ftp://anonymous:[email protected]/bussys" WScript.Sleep 100 end if set objShell = nothing set objFolder = nothing How to do that on C# (or do that without ole automation just use com) ? Or do that on c++ without MFC.

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• Windows 7 AIK help

  - by microchasm

  I've just got in a few Windows 7 (64, Windows 7 Professional) machines, and I'm trying to get the AIK 2010 working. I've set up one of the machines, and installed AIK and MDT on it. I've followed the directions at http://technet.microsoft.com/en-us/library/dd349348%28WS.10%29.aspx about 3 times now, and also tried the built-in .chm help files that came with AIK. In AIK I grab the install.wim image off the OEM cd, at which point it asks me which version (I select Professional). I follow the rest of the instructions creating a new Autounattend answer file, and fill in the various bits and pieces according the the step-by-step guides. I verify the Answer file (No warnings or errors), save it, and copy it onto a USB drive. I go to another machine, insert it's OEM Win7 Disk, and power on. I've set BIOS to boot from CD, so it goes directly into the installation. Once The files are loaded, and Setup starts, it immediately asks which version to install (Home basic, Home Premium, Professiona, Ultimate). Ugh, I thought it was supposed to be an automated install, and that selecting the Version when opening the .wim file would answer this question. I looked for an option to set which version to be installed on the net, in the help, and in AIK itself; to no avail. Anyway, just for laughs I select Professional,and hit continue. It copies files for about 10 seconds, then fails with the following error: "Setup was unable to create a new system partition or locate an existing system partition. See the setup log files for more information. [OK]". Clicking OK reboots the box, and obviously there are no log files because the OS isn't installed. It is a Dell Optiplex 380 , Intel Core Duo 2.93 GHzl 4 GB RAM, 64 Bit. Any help would be REALLY appreciated.

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• Why PreAuthenticate is not enabled by default?

  - by dr. evil

  As far as I understand WebRequest.PreAuthenticate is almost always good. If I enable it even when there is no credential it won't try to authenticate, if there is a credential it'll. So is there any legitimate reason to set it False? Or is it OK to set it True even when there is no credentials? And since it's quite useful why it's not enabled by default just like many other HTTP features?

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• ASP.NET Creating a Rich Repeater, DataBind wiping out custom added controls...

  - by tonyellard

  So...I had this clever idea that I'd create my own Repeater control that implements paging and sorting by inheriting from Repeater and extending it's capabilities. I found some information and bits and pieces on how to go about this and everything seemed ok... I created a WebControlLibrary to house my custom controls. Along with the enriched repeater, I created a composite control that would act as the "pager bar", having forward, back and page selection. My pager bar works 100% on it's own, properly firing a paged changed event when the user interacts with it. The rich repeater databinds without issue, but when the databind fires (when I call base.databind()), the control collection is cleared out and my pager bars are removed. This screws up the viewstate for the pager bars making them unable to fire their events properly or maintain their state. I've tried adding the controls back to the collection after base.databind() fires, but that doesn't solve the issue. I start to get very strange results including problems with altering the hierarchy of the control tree (resolved by adding [ViewStateModeById]). Before I go back to the drawing board and create a second composite control which contains a repeater and the pager bars (so that the repeater isn't responsible for the pager bars viewstate) are there any thoughts about how to resolve the issue? In the interest of share and share alike, the code for the repeater itself is below, the pagerbars aren't as significant as the issue is really the maintaining of state for any additional child controls. (forgive the roughness of some of the code...it's still a work in progress) using System; using System.Collections.Generic; using System.ComponentModel; using System.Text; using System.Data; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; [ViewStateModeById] public class SortablePagedRepeater : Repeater, INamingContainer { private SuperRepeaterPagerBar topBar = new SuperRepeaterPagerBar(); private SuperRepeaterPagerBar btmBar = new SuperRepeaterPagerBar(); protected override void OnInit(EventArgs e) { Page.RegisterRequiresControlState(this); InitializeControls(); base.OnInit(e); EnsureChildControls(); } protected void InitializeControls() { topBar.ID = this.ID + "__topPagerBar"; topBar.NumberOfPages = this._currentProperties.numOfPages; topBar.CurrentPage = this.CurrentPageNumber; topBar.PageChanged += new SuperRepeaterPagerBar.PageChangedEventHandler(PageChanged); btmBar.ID = this.ID + "__btmPagerBar"; btmBar.NumberOfPages = this._currentProperties.numOfPages; btmBar.CurrentPage = this.CurrentPageNumber; btmBar.PageChanged += new SuperRepeaterPagerBar.PageChangedEventHandler(PageChanged); } protected override void CreateChildControls() { EnsureDataBound(); this.Controls.Add(topBar); this.Controls.Add(btmBar); //base.CreateChildControls(); } private void PageChanged(object sender, int newPage) { this.CurrentPageNumber = newPage; } public override void DataBind() { //pageDataSource(); //DataBind removes all controls from control collection... base.DataBind(); Controls.Add(topBar); Controls.Add(btmBar); } private void pageDataSource() { //Create paged data source PagedDataSource pds = new PagedDataSource(); pds.PageSize = this.ItemsPerPage; pds.AllowPaging = true; // first get a PagedDataSource going and perform sort if possible... if (base.DataSource is System.Collections.IEnumerable) { pds.DataSource = (System.Collections.IEnumerable)base.DataSource; } else if (base.DataSource is System.Data.DataView) { DataView data = (DataView)DataSource; if (this.SortBy != null && data.Table.Columns.Contains(this.SortBy)) { data.Sort = this.SortBy; } pds.DataSource = data.Table.Rows; } else if (base.DataSource is System.Data.DataTable) { DataTable data = (DataTable)DataSource; if (this.SortBy != null && data.Columns.Contains(this.SortBy)) { data.DefaultView.Sort = this.SortBy; } pds.DataSource = data.DefaultView; } else if (base.DataSource is System.Data.DataSet) { DataSet data = (DataSet)DataSource; if (base.DataMember != null && data.Tables.Contains(base.DataMember)) { if (this.SortBy != null && data.Tables[base.DataMember].Columns.Contains(this.SortBy)) { data.Tables[base.DataMember].DefaultView.Sort = this.SortBy; } pds.DataSource = data.Tables[base.DataMember].DefaultView; } else if (data.Tables.Count > 0) { if (this.SortBy != null && data.Tables[0].Columns.Contains(this.SortBy)) { data.Tables[0].DefaultView.Sort = this.SortBy; } pds.DataSource = data.Tables[0].DefaultView; } else { throw new Exception("DataSet doesn't have any tables."); } } else if (base.DataSource == null) { // don't do anything? } else { throw new Exception("DataSource must be of type System.Collections.IEnumerable. The DataSource you provided is of type " + base.DataSource.GetType().ToString()); } if (pds != null && base.DataSource != null) { //Make sure that the page doesn't exceed the maximum number of pages //available if (this.CurrentPageNumber >= pds.PageCount) { this.CurrentPageNumber = pds.PageCount - 1; } //Set up paging values... btmBar.CurrentPage = topBar.CurrentPage = pds.CurrentPageIndex = this.CurrentPageNumber; this._currentProperties.numOfPages = btmBar.NumberOfPages = topBar.NumberOfPages = pds.PageCount; base.DataSource = pds; } } public override object DataSource { get { return base.DataSource; } set { //init(); //reset paging/sorting values since we've potentially changed data sources. base.DataSource = value; pageDataSource(); } } protected override void Render(HtmlTextWriter writer) { topBar.RenderControl(writer); base.Render(writer); btmBar.RenderControl(writer); } [Serializable] protected struct CurrentProperties { public int pageNum; public int itemsPerPage; public int numOfPages; public string sortBy; public bool sortDir; } protected CurrentProperties _currentProperties = new CurrentProperties(); protected override object SaveControlState() { return this._currentProperties; } protected override void LoadControlState(object savedState) { this._currentProperties = (CurrentProperties)savedState; } [Category("Status")] [Browsable(true)] [NotifyParentProperty(true)] [DefaultValue("")] [Localizable(false)] public string SortBy { get { return this._currentProperties.sortBy; } set { //If sorting by the same column, swap the sort direction. if (this._currentProperties.sortBy == value) { this.SortAscending = !this.SortAscending; } else { this.SortAscending = true; } this._currentProperties.sortBy = value; } } [Category("Status")] [Browsable(true)] [NotifyParentProperty(true)] [DefaultValue(true)] [Localizable(false)] public bool SortAscending { get { return this._currentProperties.sortDir; } set { this._currentProperties.sortDir = value; } } [Category("Status")] [Browsable(true)] [NotifyParentProperty(true)] [DefaultValue(25)] [Localizable(false)] public int ItemsPerPage { get { return this._currentProperties.itemsPerPage; } set { this._currentProperties.itemsPerPage = value; } } [Category("Status")] [Browsable(true)] [NotifyParentProperty(true)] [DefaultValue(1)] [Localizable(false)] public int CurrentPageNumber { get { return this._currentProperties.pageNum; } set { this._currentProperties.pageNum = value; pageDataSource(); } } }

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• Setting up ProxyPass for a Virtualmin virtual server

  - by Andy Ibanez

  I am trying to set up my web server so that I can server multiple Ghost.org blogs. I am stuck in one crucial step. To be honest, my knowledge in servers is not so big, so I request your help to do this. Basically, a tutorial I'm reading suggests I set up a VirtualHost in this way: NameVirtualHost *:80 <VirtualHost *:80> ServerName your-url.com ServerAlias www.your-url.com ProxyRequests off ProxyPass / http://127.0.0.1:2368/ ProxyPassReverse / http:/127.0.0.1:2368/ </VirtualHost> So I have gone to the Virtual site on Virtualmin to try to add everything as is. Services Configure Website Edit Directives The problem is, the previous page (Services Configure website) says I can't edit the port: This Apache virtual host belongs to the Virtualmin server linguist.andyibanez.com, so the address, port, base directory and hostname cannot be changed here. And whenever I try to add the ProxyRequests off (the other two can be added fine) directive in Edit Directives manually, I'm simply told that the directive can't be there. So what is the right way to "add" the last three directives in the VirtualHost above to my sub server? Maybe I'm missing a menu item that will help me with this? I request your help as I have looked for a while, Google keeps thinking I want to serve Webmin via Apache when I google "Set up Virtualmin proxypass", and I have no clue what to do.

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• Configure IPv6 routing

  - by godlark

  I've got IPv6 addresses from SIXXS. My host is connected with SIXXS network over a AICCU tunnel ("sixxs" interface). My host address is 2001:::2, the host on the end has address 2001:::1. On my host IPv6 is fully accessible. I have problem with configuring IPv6 network on VMs. I use VirtualBox, the VM (Ubuntu) uses tap1 (on the host bridged by br0) #!/bin/sh PATH=/sbin:/usr/bin:/bin:/usr/bin:/usr/sbin # create a tap tunctl -t tap1 ip link set up dev tap1 # create the bridge brctl addbr br0 brctl addif br0 tap1 # set the IP address and routing ip link set up dev br0 ip -6 route del 2001:6a0:200:172::/64 dev sixxs ip -6 route add 2001:6a0:200:172::1 dev sixxs ip -6 addr add 2001:6a0:200:172::2/64 dev br0 ip -6 route add 2001:6a0:200:172::2/64 dev br0 Host: routing table: 2001:6a0:200:172::1 dev sixxs metric 1024 2001:6a0:200:172::/64 dev br0 proto kernel metric 256 2001:6a0:200:172::/64 dev br0 metric 1024 2000::/3 dev sixxs metric 1024 fe80::/64 dev eth0 proto kernel metric 256 fe80::/64 dev sixxs proto kernel metric 256 fe80::/64 dev br0 proto kernel metric 256 fe80::/64 dev tap1 proto kernel metric 256 default via 2001:6a0:200:172::1 dev sixxs metric 1024 Guest: interface eth1 (it is connected with tap1): auto eth1 iface eth1 inet6 static address 2001:6a0:200:172::3 netmask 64 gateway 2001:6a0:200:172::2 Guest: routing table 2001:6a0:200:172::/64 dev eth1 proto kernel metric 256 fe80::/64 dev eth0 proto kernel metric 256 fe80::/64 dev eth1 proto kernel metric 256 default via 2001:6a0:200:172::2 dev eth1 metric 1024 The guest pings to the host, the host pings to the guest, the host pings to 2001:6a0:200:172::1, but the guest doesn't ping to 2001:6a0:200:172::1. The guest tries to ping, on the host (by tcdump) I can capture its packets, but the host doesn't send them to 2001:6a0:200:172::1. What have I missed in configuration?

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• Using Objective-C Blocks

  - by Sean

  Today I was experimenting with Objective-C's blocks so I thought I'd be clever and add to NSArray a few functional-style collection methods that I've seen in other languages: @interface NSArray (FunWithBlocks) - (NSArray *)collect:(id (^)(id obj))block; - (NSArray *)select:(BOOL (^)(id obj))block; - (NSArray *)flattenedArray; @end The collect: method takes a block which is called for each item in the array and expected to return the results of some operation using that item. The result is the collection of all of those results. (If the block returns nil, nothing is added to the result set.) The select: method will return a new array with only the items from the original that, when passed as an argument to the block, the block returned YES. And finally, the flattenedArray method iterates over the array's items. If an item is an array, it recursively calls flattenedArray on it and adds the results to the result set. If the item isn't an array, it adds the item to the result set. The result set is returned when everything is finished. So now that I had some infrastructure, I needed a test case. I decided to find all package files in the system's application directories. This is what I came up with: NSArray *packagePaths = [[[NSSearchPathForDirectoriesInDomains(NSAllApplicationsDirectory, NSAllDomainsMask, YES) collect:^(id path) { return (id)[[[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil] collect:^(id file) { return (id)[path stringByAppendingPathComponent:file]; }]; }] flattenedArray] select:^(id fullPath) { return [[NSWorkspace sharedWorkspace] isFilePackageAtPath:fullPath]; }]; Yep - that's all one line and it's horrid. I tried a few approaches at adding newlines and indentation to try to clean it up, but it still feels like the actual algorithm is lost in all the noise. I don't know if it's just a syntax thing or my relative in-experience with using a functional style that's the problem, though. For comparison, I decided to do it "the old fashioned way" and just use loops: NSMutableArray *packagePaths = [NSMutableArray new]; for (NSString *searchPath in NSSearchPathForDirectoriesInDomains(NSAllApplicationsDirectory, NSAllDomainsMask, YES)) { for (NSString *file in [[NSFileManager defaultManager] contentsOfDirectoryAtPath:searchPath error:nil]) { NSString *packagePath = [searchPath stringByAppendingPathComponent:file]; if ([[NSWorkspace sharedWorkspace] isFilePackageAtPath:packagePath]) { [packagePaths addObject:packagePath]; } } } IMO this version was easier to write and is more readable to boot. I suppose it's possible this was somehow a bad example, but it seems like a legitimate way to use blocks to me. (Am I wrong?) Am I missing something about how to write or structure Objective-C code with blocks that would clean this up and make it clearer than (or even just as clear as) the looped version?

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• How to Get Serial Number or ID of Android Emulator After it Runs?

  - by papalagi

  If I run several emulators with -no-window option in one machine. The command "adb devices" shows: List of devices attached emulator-5554 device emulator-5556 device emulator-5558 device ... However, according to this output, I can't tell the difference between each emulator device at all. I need to know which emulator runs on what AVD, then I can install APKs or send commands to the emulator. How can I recognize each emulator device or get the serial number of emulator after it runs?

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• UIViewController not loading a UIView

  - by Cosizzle

  Hey, I'm playing around with a script my teacher provided for a table based application. However I can't seem to get my own view to load. Files: SubViewOneController (which is a sub view, also has a nib) TapViewController (Custom UIView I created and want to add to a cell) RootViewController (Main controller which loads in the views) SimpleNavAppDelegate How it works: Within the RootViewController, there's an NSArray that holds NSDictionary objects which is declared in the -(void)awakeFromNib {} method - (void)awakeFromNib { // we'll keep track of our views controllers in this array views = [[NSMutableArray alloc] init]; // when using alloc you are responsible for it, and you will have to release it. // ==================================================================================================== // ==================================================================================================== // LOADING IN CUSTOM VIEW HERE: // allocate a set of views and add to our view array as a dictionary item TapViewController *tapBoardView = [[TapViewController alloc] init]; //push onto array [views addObject:[NSDictionary dictionaryWithObjectsAndKeys: @"Tab Gestures", @"title", tapBoardView, @"controller", nil]]; [tapBoardView release]; //release the memory // ==================================================================================================== // ==================================================================================================== SubViewOneController *subViewOneController = [[SubViewOneController alloc] init]; // This will set the 2nd level title subViewOneController.title = @"Swipe Gestures"; //set it's title //push it onto the array [views addObject:[NSDictionary dictionaryWithObjectsAndKeys: @"Swipe Gestures", @"title", subViewOneController, @"controller", nil]]; [subViewOneController release]; //release the memory } Later on I set the table view: - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // OUTPUT -- see console NSLog(@"indexPath %i", indexPath.row); // OUTPUT: tapController: <TapViewController: 0x3b2b360> NSLog(@"view object: %@", [views objectAtIndex:indexPath.row]); // OUTPUT: view object: controller = <TapViewController: 0x3b0e290>; title = "Tab Gestures"; // ----- Hardcoding the controller and nib file in does work, so it's not a linkage issue ------ // UNCOMMENT TO SEE WORKING -- comment below section. //TapViewController *tapContoller = [[TapViewController alloc] initWithNibName:@"TapBoardView" bundle:nil]; //NSLog(@"tapController: %@", tapContoller); //[self.navigationController pushViewController:tapContoller animated:YES]; // ----- Random Tests ----- //UIViewController *targetViewController = [[views objectAtIndex: 0] objectForKey:@"controller"]; // DOES NOT WORK // LOADS THE SECOND CELL (SubViewOneController) however will not load (TapViewController) UIViewController *targetViewController = [[views objectAtIndex: indexPath.row] objectForKey:@"controller"]; NSLog(@"target: %@", targetViewController); // OUTPUT: target: <TapViewController: 0x3b0e290> [self.navigationController pushViewController:targetViewController animated:YES]; } Reading the comments you should be able to see that hardcoding the view in, works - however trying to load it from the View NSArray does not work. It does however contain the object in memory, seeing that NSLog proves that. Everything is linked up and working within the TapViewController nib file. So ya, im kinda stuck on this one, any help would be great! Thanks guys

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