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  • Reading a text file, and performing actions based on strings read

    - by user1691766
    Let me start off by saying that I really am quite new to C. So basically I have a text file (contains around 30 assembly instructions, separated by new lines), and I am successfully reading them into my program. From here I need to perform certain actions based off each instruction. I would assume the best way to do this would be via a switch-case statement. However I am encountering a lot of problems due to me trying to compare strings that are 33 characters long. Can anyone please offer me advice on what I am doing wrong, or offer an alternative? Thanks in advance. Here is what I have so far: char instruction[29][ 33 ]; int i,run; i = 0; run = 1; FILE *instPtr; /* LOADING INSTRUCTIONS FROM FILE INTO "instruction" ARRAY*/ if ( ( instPtr = fopen("MIPSinstructions.txt", "r") ) == NULL ) { printf("File could not be opened\n"); } // end if else { fscanf( instPtr, "%s", instruction[0]); printf("%s\n", instruction[0]); while (!feof( instPtr ) ){ i++; fscanf( instPtr, "%s", instruction[i]); printf("%s\n", instruction[i]); } fclose( instPtr ); i = 0; // Reset the counter } //end else return 0; }

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  • Cannot turn on "Network Discovery and File Sharing" when Windows Firewall is enabled

    - by Cheeso
    I have a problem similar to this one. Windows Firewall prevents File and Printer sharing from working and Why does File and Printer Sharing keep turning off in Windows 7? I cannot turn on Network Discovery. This is Windows 7 Home Premium, x64. It's a Dell XPS 1340 and Windows came installed from the OEM. This used to work. Now it doesn't. I don't know what has changed. In windows Explorer, the UI looks like this: When I click the yellow panel that says "Click to change...", the panel disappears, then immediately reappears, with exactly the same text. If I go through the control panel "Network and Sharing Center" thing, the UI looks like this: If I tick the box to "turn on network discovery", the "Save Changes" button becomes enabled. If I then click that button, the dialog box just closes, with no message or confirmation. Re-opening the same dialog box shows that Network Discovery has not been turned on. If I turn off Windows Firewall, I can then turn on Network Discovery via either method. The machine is connected to a wireless home network, via a router. The network is marked as "Home Network" in the Network and Sharing Center, which I think corresponds to the "Private" profile in Windows Firewall Advanced Settings app. (Confirm?) The PC is not part of a domain, and has never been part of a domain. The machine is not bridging any networks. There is a regular 100baseT connector but I have the network adapter for that disabled in Windows. Something else that seems odd. Within Windows Firewall Advanced Settings, there are no predefined rules available. If I click the "New Rule...." Action on the action pane, the "Predefined" option is greyed out. like this: In order to attempt to allow the network discovery protocols through on the private network, I hand-coded a bunch of rules, intending to allow the necessary UPnP and WDP protocols supporting network discovery. I copied them from a working Windows 7 Ultimate PC, running on the same network. This did not work. Even with the hand-coded rules, I still cannot turn on Network Discovery. I looked on the interwebs, and the only solution that appears to work is a re-install of Windows. Seriously? If I try netsh advfirewall firewall set rule group="Network Discovery" new enable=Yes ...it says "No rules match the specified criteria" EDIT: by the way, these services are running. DNS Client Function Discovery Resource Publication SSDP Discovery UPnP Device Host in any case, since it works with no firewall, I would assume all necessary services are present and running. The issue is a firewall thing, but I don't know how to diagnose further, or fix it. Q1: Is there a way to definitively insure the correct holes are punched through the Windows Firewall to allow Network Discovery to function? Q2: Should I expect the "predefined" firewall rules to be greyed out? Q3: Why did this change?

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  • Where's the Swap File/Partition?

    - by chrisbunney
    I'm investigating the virtual memory configuration of a Debian based Amazon EC2 instance, and as my background isn't in system admin, I'm slightly confused by what I'm seeing. We're using MongoDB, and the monitoring server we have indicates that the Mongo process is using about 20GB of swap space, however I can't figure out where this is located on the server. As far as I can tell from using the various suggested methods from Google, there is either a much smaller amount, or none at all. top indicates that there is 1.8GB of swap memory: top - 15:35:21 up 6 days, 3:23, 1 user, load average: 1.60, 1.43, 1.37 Tasks: 47 total, 2 running, 45 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 1.3%sy, 0.0%ni, 14.7%id, 83.8%wa, 0.0%hi, 0.0%si, 0.1%st Mem: 3928924k total, 2855572k used, 1073352k free, 640564k buffers Swap: 0k total, 0k used, 0k free, 1887788k cached swapon -s doesn't seem to think there's any swap space: Filename Type Size Used Priority free -m doesn't think there's any swap either: total used free shared buffers cached Mem: 3836 3663 172 0 626 2701 -/+ buffers/cache: 336 3500 Swap: 0 0 0 And neither does vmstat: procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 3 0 66224 641372 2874744 0 0 21 5012 21 33 2 2 76 19 But cat /etc/fstab thinks there is a swap partition: /dev/xvda1 / ext3 defaults 1 1 /dev/xvda2 /mnt ext3 defaults 0 0 /dev/xvda3 swap swap defaults 0 0 none /proc proc defaults 0 0 none /sys sysfs defaults 0 0 However df -k gives no indication of the xvda3 partition: Filesystem 1K-blocks Used Available Use% Mounted on /dev/xvda1 16513960 15675324 0 100% / tmpfs 1964460 8 1964452 1% /lib/init/rw udev 1914148 28 1914120 1% /dev tmpfs 1964460 4 1964456 1% /dev/shm So I really don't know what to make of this, because I appear to have a process using about 10 times more virtual memory than what might be available, and I have no idea where this virtual memory is on the system. I'm probably misinterpreting the output of the tools, so I'd be grateful if someone would be able to set me straight: What have I got wrong, what's the right interpretation, and how do you reach that interpretation? EDIT0: We use 10gen's MMS for monitoring the database, the relevant section for memory from the last data point is: "mem": { "virtual": 20749, "bits": 64, "supported": true, "mappedWithJournal": 20376, "mapped": 10188, "resident": 1219 }, This JSON is specific to the database process (I believe) rather than the system as a whole. fdisk -l /dev/xvda outputs... nothing? I tried each of the 3 xvda entries in /etc/fstab as well: root@ip:~# fdisk -l /dev/xvda1 Disk /dev/xvda1: 34.4 GB, 34359738368 bytes 255 heads, 63 sectors/track, 4177 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/xvda1 doesn't contain a valid partition table root@ip:~# fdisk -l /dev/xvda2 root@ip:~# fdisk -l /dev/xvda3 root@ip:~# Edit1: Output of cat /proc/meminfo for the sake of completeness: MemTotal: 3928924 kB MemFree: 726600 kB Buffers: 648368 kB Cached: 2216556 kB SwapCached: 0 kB Active: 1945100 kB Inactive: 994016 kB Active(anon): 60476 kB Inactive(anon): 12952 kB Active(file): 1884624 kB Inactive(file): 981064 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 387180 kB Writeback: 0 kB AnonPages: 73380 kB Mapped: 1188260 kB Shmem: 48 kB Slab: 149768 kB SReclaimable: 146076 kB SUnreclaim: 3692 kB KernelStack: 1104 kB PageTables: 16096 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 1964460 kB Committed_AS: 305572 kB VmallocTotal: 34359738367 kB VmallocUsed: 16760 kB VmallocChunk: 34359721448 kB HardwareCorrupted: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 3932160 kB DirectMap2M: 0 kB

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  • Nginx alias or rewrite for Horde Groupware ActiveSync URL does not process the rpc.php file

    - by Benny Li
    I'm trying to setup a Horde groupware with Nginx. The webinterface works but I do not get the ActiveSync specific URL to work. The Horde Wiki explains how to use it with an Apache Webserver here. My problem is, that I setup a rewrite (tried an alias too) to serve the location /horde/Microsoft-Server-ActiveSync via the /horde/rpc.php script. But with my current configuration nginx does the rewrite and returns a 200 status code. But it looks like that the php file is not executed. If I go to /horde/rpc.php directly it opens up the login dialog. So this seems to work correct. Firstly I was googling about the problem but could not find a working solution. So now I would like to ask you. The configuration should allow to access the ActiveSync part via the URL /horde/Microsoft-Server-ActiveSync. The horde webinterface is already accessible via /horde. My configuration looks like this: default-ssl.conf server { listen 443 ssl; ssl on; ssl_certificate /opt/nginx/conf/certs/server.crt; ssl_certificate_key /opt/nginx/conf/certs/server.key; server_name example.com; index index.html index.php; root /var/www; include sites-available/horde.conf; } horde.conf location /horde { rewrite_log on; rewrite ^/horde/Microsoft-Server-ActiveSync(.*)$ /horde/rpc.php$1 last; try_files $uri $uri/ /rampage.php?$args; location ~ \.php$ { try_files $uri =404; include sites-available/horde.fcgi-php.conf; } } horde.fcgi-php.conf include fastcgi_params; fastcgi_split_path_info ^(.+\.php)(/.+)$; fastcgi_param PATH_INFO $fastcgi_path_info; fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_params (default nginx) fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param HTTPS $https if_not_empty; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx/$nginx_version; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; # PHP only, required if PHP was built with --enable-force-cgi-redirect fastcgi_param REDIRECT_STATUS 200; The nginx log level is set to debug. The output after the request is: 2014/06/13 10:33:15 [notice] 17332#0: *1 "^/horde/Microsoft-Server-ActiveSync(.*)$" matches "/horde/Microsoft-Server-ActiveSync", client: XX.XX.XX.XX, server: example.com, request: "GET /horde/Microsoft-Server-ActiveSync HTTP/1.1", host: "example.com" 2014/06/13 10:33:15 [notice] 17332#0: *1 rewritten data: "/horde/rpc.php", args: "", client: XX.XX.XX.XX, server: example.com, request: "GET /horde/Microsoft-Server-ActiveSync HTTP/1.1", host: "example.com" All this is happening on a RaspberryPi with Raspbian GNU/Linux 7 (which is mainly a Debian Wheezy). So I guess the rewrite works but the php file is not processed?! Does anyone know where the problem is and how to fix it?

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  • SSIS: Building SQL databases on-the-fly using concatenated SQL scripts

    - by DrJohn
    Over the years I have developed many techniques which help automate the whole SQL Server build process. In my current process, where I need to build entire OLAP data marts on-the-fly, I make regular use of a simple but very effective mechanism to concatenate all the SQL Scripts together from my SSMS (SQL Server Management Studio) projects. This proves invaluable because in two clicks I can redeploy an entire SQL Server database with all tables, views, stored procedures etc. Indeed, I can also use the concatenated SQL scripts with SSIS to build SQL Server databases on-the-fly. You may be surprised to learn that I often redeploy the database several times per day, or even several times per hour, during the development process. This is because the deployment errors are logged and you can quickly see where SQL Scripts have object dependency errors. For example, after changing a table structure you may have forgotten to change any related views. The deployment log immediately points out all the objects which failed to build so you can fix and redeploy the database very quickly. The alternative approach (i.e. doing changes in the database directly using the SSMS UI) would require you to check all dependent objects before making changes. The chances are that you will miss something and wonder why your app returns the wrong data – a common problem caused by changing a table without re-creating dependent views. Using SQL Projects in SSMS A great many developers fail to make use of SQL Projects in SSMS (SQL Server Management Studio). To me they are invaluable way of organizing your SQL Scripts. The screenshot below shows a typical SSMS solution made up of several projects – one project for tables, another for views etc. The key point is that the projects naturally fall into the right order in file system because of the project name. The number in the folder or file name ensures that the projects the SQL scripts are concatenated together in the order that they need to be executed. Hence the script filenames start with 100, 110 etc. Concatenating SQL Scripts To concatenate the SQL Scripts together into one file, I use notepad.exe to create a simple batch file (see example screenshot) which uses the TYPE command to write the content of the SQL Script files into a combined file. As the SQL Scripts are in several folders, I simply use several TYPE command multiple times and append the output together. If you are unfamiliar with batch files, you may not know that the angled bracket (>) means write output of the program into a file. Two angled brackets (>>) means append output of this program into a file. So the command-line DIR > filelist.txt would write the content of the DIR command into a file called filelist.txt. In the example shown above, the concatenated file is called SB_DDS.sql If, like me you place the concatenated file under source code control, then the source code control system will change the file's attribute to "read-only" which in turn would cause the TYPE command to fail. The ATTRIB command can be used to remove the read-only flag. Using SQLCmd to execute the concatenated file Now that the SQL Scripts are all in one big file, we can execute the script against a database using SQLCmd using another batch file as shown below: SQLCmd has numerous options, but the script shown above simply executes the SS_DDS.sql file against the SB_DDS_DB database on the local machine and logs the errors to a file called SB_DDS.log. So after executing the batch file you can simply check the error log to see if your database built without a hitch. If you have errors, then simply fix the source files, re-create the concatenated file and re-run the SQLCmd to rebuild the database. This two click operation allows you to quickly identify and fix errors in your entire database definition.Using SSIS to execute the concatenated file To execute the concatenated SQL script using SSIS, you simply drop an Execute SQL task into your package and set the database connection as normal and then select File Connection as the SQLSourceType (as shown below). Create a file connection to your concatenated SQL script and you are ready to go.   Tips and TricksAdd a new-line at end of every fileThe most common problem encountered with this approach is that the GO statement on the last line of one file is placed on the same line as the comment at the top of the next file by the TYPE command. The easy fix to this is to ensure all your files have a new-line at the end.Remove all USE database statementsThe SQLCmd identifies which database the script should be run against.  So you should remove all USE database commands from your scripts - otherwise you may get unintentional side effects!!Do the Create Database separatelyIf you are using SSIS to create the database as well as create the objects and populate the database, then invoke the CREATE DATABASE command against the master database using a separate package before calling the package that executes the concatenated SQL script.    

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  • Team Foundation Server (TFS) Team Build Custom Activity C# Code for Assembly Stamping

    - by Bob Hardister
    For the full context and guidance on how to develop and implement a custom activity in Team Build see the Microsoft Visual Studio Rangers Team Foundation Build Customization Guide V.1 at http://vsarbuildguide.codeplex.com/ There are many ways to stamp or set the version number of your assemblies. This approach is based on the build number.   namespace CustomActivities { using System; using System.Activities; using System.IO; using System.Text.RegularExpressions; using Microsoft.TeamFoundation.Build.Client; [BuildActivity(HostEnvironmentOption.Agent)] public sealed class VersionAssemblies : CodeActivity { /// <summary> /// AssemblyInfoFileMask /// </summary> [RequiredArgument] public InArgument<string> AssemblyInfoFileMask { get; set; } /// <summary> /// SourcesDirectory /// </summary> [RequiredArgument] public InArgument<string> SourcesDirectory { get; set; } /// <summary> /// BuildNumber /// </summary> [RequiredArgument] public InArgument<string> BuildNumber { get; set; } /// <summary> /// BuildDirectory /// </summary> [RequiredArgument] public InArgument<string> BuildDirectory { get; set; } /// <summary> /// Publishes field values to the build report /// </summary> public OutArgument<string> DiagnosticTextOut { get; set; } // If your activity returns a value, derive from CodeActivity<TResult> and return the value from the Execute method. protected override void Execute(CodeActivityContext context) { // Obtain the runtime value of the input arguments string sourcesDirectory = context.GetValue(this.SourcesDirectory); string assemblyInfoFileMask = context.GetValue(this.AssemblyInfoFileMask); string buildNumber = context.GetValue(this.BuildNumber); string buildDirectory = context.GetValue(this.BuildDirectory); // ** Determine the version number values ** // Note: the format used here is: major.secondary.maintenance.build // ----------------------------------------------------------------- // Obtain the build definition name int nameStart = buildDirectory.LastIndexOf(@"\") + 1; string buildDefinitionName = buildDirectory.Substring(nameStart); // Set the primary.secondary.maintenance values // NOTE: these are hard coded in this example, but could be sourced from a file or parsed from a build definition name that includes them string p = "1"; string s = "5"; string m = "2"; // Initialize the build number string b; string na = "0"; // used for Assembly and Product Version instead of build number (see versioning best practices: **TBD reference) // Set qualifying product version information string productInfo = "RC2"; // Obtain the build increment number from the build number // NOTE: this code assumes the default build definition name format int buildIncrementNumberDelimterIndex = buildNumber.LastIndexOf("."); b = buildNumber.Substring(buildIncrementNumberDelimterIndex + 1); // Convert version to integer values int pVer = Convert.ToInt16(p); int sVer = Convert.ToInt16(s); int mVer = Convert.ToInt16(m); int bNum = Convert.ToInt16(b); int naNum = Convert.ToInt16(na); // ** Get all AssemblyInfo files and stamp them ** // Note: the mapping of AssemblyInfo.cs attributes to assembly display properties are as follows: // - AssemblyVersion = Assembly Version - used for the assembly version (does not change unless p, s or m values are changed) // - AssemblyFileVersion = File Version - used for the file version (changes with every build) // - AssemblyInformationalVersion = Product Version - used for the product version (can include additional version information) // ------------------------------------------------------------------------------------------------------------------------------------------------ Version assemblyVersion = new Version(pVer, sVer, mVer, naNum); Version newAssemblyFileVersion = new Version(pVer, sVer, mVer, bNum); Version productVersion = new Version(pVer, sVer, mVer); // Setup diagnostic fields int numberOfReplacements = 0; string addedAssemblyInformationalAttribute = "No"; // Enumerate over the assemblyInfo version attributes foreach (string attribute in new[] { "AssemblyVersion", "AssemblyFileVersion", "AssemblyInformationalVersion" }) { // Define the regular expression to find in each and every Assemblyinfo.cs files (which is for example 'AssemblyVersion("1.0.0.0")' ) Regex regex = new Regex(attribute + @"\(""\d+\.\d+\.\d+\.\d+""\)"); foreach (string file in Directory.EnumerateFiles(sourcesDirectory, assemblyInfoFileMask, SearchOption.AllDirectories)) { string text = File.ReadAllText(file); // Read the text from the AssemblyInfo file // If the AsemblyInformationalVersion attribute is not in the file, add it as the last line of the file // Note: by default the AssemblyInfo.cs files will not contain the AssemblyInformationalVersion attribute if (!text.Contains("[assembly: AssemblyInformationalVersion(\"")) { string lastLine = Environment.NewLine + "[assembly: AssemblyInformationalVersion(\"1.0.0.0\")]"; text = text + lastLine; addedAssemblyInformationalAttribute = "Yes"; } // Search for the expression Match match = regex.Match(text); if (match.Success) { // Get file attributes FileAttributes fileAttributes = File.GetAttributes(file); // Set file to read only File.SetAttributes(file, fileAttributes & ~FileAttributes.ReadOnly); // Insert AssemblyInformationalVersion attribute into the file text if does not already exist string newText = string.Empty; if (attribute == "AssemblyVersion") { newText = regex.Replace(text, attribute + "(\"" + assemblyVersion + "\")"); numberOfReplacements++; } if (attribute == "AssemblyFileVersion") { newText = regex.Replace(text, attribute + "(\"" + newAssemblyFileVersion + "\")"); numberOfReplacements++; } if (attribute == "AssemblyInformationalVersion") { newText = regex.Replace(text, attribute + "(\"" + productVersion + " " + productInfo + "\")"); numberOfReplacements++; } // Publish diagnostics to build report (diagnostic verbosity only) context.SetValue(this.DiagnosticTextOut, " Added AssemblyInformational Attribute: " + addedAssemblyInformationalAttribute + " Number of replacements: " + numberOfReplacements + " Build number: " + buildNumber + " Build directory: " + buildDirectory + " Build definition name: " + buildDefinitionName + " Assembly version: " + assemblyVersion + " New file version: " + newAssemblyFileVersion + " Product version: " + productVersion + " AssemblyInfo.cs Text Last Stamped: " + newText); // Write the new text in the AssemblyInfo file File.WriteAllText(file, newText); // restore the file's original attributes File.SetAttributes(file, fileAttributes); } } } } } }

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  • Optimizing a thread safe Java NIO / Serialization / FIFO Queue [migrated]

    - by trialcodr
    I've written a thread safe, persistent FIFO for Serializable items. The reason for reinventing the wheel is that we simply can't afford any third party dependencies in this project and want to keep this really simple. The problem is it isn't fast enough. Most of it is undoubtedly due to reading and writing directly to disk but I think we should be able to squeeze a bit more out of it anyway. Any ideas on how to improve the performance of the 'take'- and 'add'-methods? /** * <code>DiskQueue</code> Persistent, thread safe FIFO queue for * <code>Serializable</code> items. */ public class DiskQueue<ItemT extends Serializable> { public static final int EMPTY_OFFS = -1; public static final int LONG_SIZE = 8; public static final int HEADER_SIZE = LONG_SIZE * 2; private InputStream inputStream; private OutputStream outputStream; private RandomAccessFile file; private FileChannel channel; private long offs = EMPTY_OFFS; private long size = 0; public DiskQueue(String filename) { try { boolean fileExists = new File(filename).exists(); file = new RandomAccessFile(filename, "rwd"); if (fileExists) { size = file.readLong(); offs = file.readLong(); } else { file.writeLong(size); file.writeLong(offs); } } catch (FileNotFoundException e) { throw new RuntimeException(e); } catch (IOException e) { throw new RuntimeException(e); } channel = file.getChannel(); inputStream = Channels.newInputStream(channel); outputStream = Channels.newOutputStream(channel); } /** * Add item to end of queue. */ public void add(ItemT item) { try { synchronized (this) { channel.position(channel.size()); ObjectOutputStream s = new ObjectOutputStream(outputStream); s.writeObject(item); s.flush(); size++; file.seek(0); file.writeLong(size); if (offs == EMPTY_OFFS) { offs = HEADER_SIZE; file.writeLong(offs); } notify(); } } catch (IOException e) { throw new RuntimeException(e); } } /** * Clears overhead by moving the remaining items up and shortening the file. */ public synchronized void defrag() { if (offs > HEADER_SIZE && size > 0) { try { long totalBytes = channel.size() - offs; ByteBuffer buffer = ByteBuffer.allocateDirect((int) totalBytes); channel.position(offs); for (int bytes = 0; bytes < totalBytes;) { int res = channel.read(buffer); if (res == -1) { throw new IOException("Failed to read data into buffer"); } bytes += res; } channel.position(HEADER_SIZE); buffer.flip(); for (int bytes = 0; bytes < totalBytes;) { int res = channel.write(buffer); if (res == -1) { throw new IOException("Failed to write buffer to file"); } bytes += res; } offs = HEADER_SIZE; file.seek(LONG_SIZE); file.writeLong(offs); file.setLength(HEADER_SIZE + totalBytes); } catch (IOException e) { throw new RuntimeException(e); } } } /** * Returns the queue overhead in bytes. */ public synchronized long overhead() { return (offs == EMPTY_OFFS) ? 0 : offs - HEADER_SIZE; } /** * Returns the first item in the queue, blocks if queue is empty. */ public ItemT peek() throws InterruptedException { block(); synchronized (this) { if (offs != EMPTY_OFFS) { return readItem(); } } return peek(); } /** * Returns the number of remaining items in queue. */ public synchronized long size() { return size; } /** * Removes and returns the first item in the queue, blocks if queue is empty. */ public ItemT take() throws InterruptedException { block(); try { synchronized (this) { if (offs != EMPTY_OFFS) { ItemT result = readItem(); size--; offs = channel.position(); file.seek(0); if (offs == channel.size()) { truncate(); } file.writeLong(size); file.writeLong(offs); return result; } } return take(); } catch (IOException e) { throw new RuntimeException(e); } } /** * Throw away all items and reset the file. */ public synchronized void truncate() { try { offs = EMPTY_OFFS; file.setLength(HEADER_SIZE); size = 0; } catch (IOException e) { throw new RuntimeException(e); } } /** * Block until an item is available. */ protected void block() throws InterruptedException { while (offs == EMPTY_OFFS) { try { synchronized (this) { wait(); file.seek(LONG_SIZE); offs = file.readLong(); } } catch (IOException e) { throw new RuntimeException(e); } } } /** * Read and return item. */ @SuppressWarnings("unchecked") protected ItemT readItem() { try { channel.position(offs); return (ItemT) new ObjectInputStream(inputStream).readObject(); } catch (ClassNotFoundException e) { throw new RuntimeException(e); } catch (IOException e) { throw new RuntimeException(e); } } }

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  • Parsing an MS Project 2007 xml project file.

    - by fred-22
    Has anyone got any idea how to read the XML file saved by MS Project 2007? The standard binary format is .MPP but I'd like to view a project in a different viewer. I've saved the project spec as XML and the viewer I'm using needs the parent task Id for each task. Where can i find that in the rather huge amount of XML data created by ms project?

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  • OBML file format

    - by Gowtham
    Opera mini browser can save HTML pages in OBML (Opera Binary Markup Language) format for offline browsing. I am wondering if I can convert a HTML file to OBML format and save in my phone for later viewing. For doing so, I need details about the OBML format, which seems to be undocumented. Do you know more details on this OBML format? Thanks for your time.

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  • Having problem with C++ file handling

    - by caramel1991
    Our lecturer has given us a task,I've attempted it and try every single effort I can,but I still struggle with one of the problem in it,here goes the question: The company you work at receives a monthly report in a text format. The report contains the following information. • Department Name • Head of Department Name • Month • Minimum spending of the month • Maximum spending of the month Your program is to obtain the name of the input file from the user. Implement a structure to represent the data: Once the file has been read into your program, print out the following statistics for the user: • List which department has the minimum spending per month by month • List which department has the minimum spending by month by month Write the information into a file called “MaxMin.txt” Then do a processing so that the Department Name, Head of Department Name, Minimum spending and Maximum spending are written to separate files based on the month, eg Jan, Feb, March and so on. and of course our lecturer does send us a text file with the content: Engineering Bill Jan 2000 15000 IT Jack Jan 300 20000 HR Jill Jan 1500 10000 Engineering Bill Feb 5000 45000 IT Jack Feb 4500 7000 HR Jill Feb 5600 60000 Engineering Bill Mar 5000 45000 IT Jack Mar 4500 7000 HR Jill Mar 5600 60000 Engineering Bill Apr 5000 45000 IT Jack Apr 4500 7000 HR Jill Apr 5600 60000 Engineering Bill May 2000 15000 IT Jack May 300 20000 HR Jill May 1500 10000 Engineering Bill Jun 2000 15000 IT Jack Jun 300 20000 HR Jill Jun 1500 10000 and here's the c++ code I've written ue#include include include using namespace std; struct Record { string depName; string head; string month; float max; float min; string name; }myRecord[19]; int main () { string line; ofstream minmax,jan,feb,mar,apr,may,jun; char a[50]; char b[50]; int i = 0,j,k; float temp; //float maxjan=myRecord[0].max,maxfeb=myRecord[0].max,maxmar=myRecord[0].max,maxapr=myRecord[0].max,maxmay=myRecord[0].max,maxjune=myRecord[0].max; float minjan=myRecord[1].min,minfeb=myRecord[1].min,minmar=myRecord[1].min,minapr=myRecord[1].min,minmay=myRecord[1].min,minjune=myRecord[1].min; float maxjan=0,maxfeb=0,maxmar=0,maxapr=0,maxmay=0,maxjune=0; //float minjan=0,minfeb=0,minmar=0,minapr=0,minmay=0,minjune=0; string maxjanDep,maxfebDep,maxmarDep,maxaprDep,maxmayDep,maxjunDep; string minjanDep,minfebDep,minmarDep,minaprDep,minmayDep,minjunDep; cout<<"Enter file name: "; cina; ifstream myfile (a); //minmax.open ("MaxMin.txt"); if (myfile.is_open()){ while (! myfile.eof()){ myfilemyRecord[i].depNamemyRecord[i].headmyRecord[i].monthmyRecord[i].minmyRecord[i].max; cout << myRecord[i].depName<<"\t"< cout<<"Enter file name: "; cinb; ifstream myfile1 (b); minmax.open ("MaxMin.txt"); jan.open ("Jan.txt"); feb.open ("Feb.txt"); mar.open ("March.txt"); apr.open ("April.txt"); may.open ("May.txt"); jun.open ("Jun.txt"); if (myfile1.is_open()){ while (! myfile1.eof()){ myfile1myRecord[i].depNamemyRecord[i].headmyRecord[i].monthmyRecord[i].minmyRecord[i].max; if (myRecord[i].month == "Jan"){ jan<< myRecord[i].depName<<"\t"< if (maxjan< myRecord[i].max){ maxjan=myRecord[i].max; maxjanDep=myRecord[i].depName;} //if (minjan myRecord[i].min){ // minjan=myRecord[i].min; //minjanDep=myRecord[i].depName; //} for (k=1;k<=3;k++){ for (j=0;j<2;j++){ if (myRecord[j].minmyRecord[j+1].min){ temp=myRecord[j].min; myRecord[j].min=myRecord[j+1].min; myRecord[j+1].min=temp; minjanDep=myRecord[j].depName; }}} } if (myRecord[i].month == "Feb"){ feb<< myRecord[i].depName<<"\t"< //if (minfebmyRecord[i].min){ //minfeb=myRecord[i].min; //minfebDep=myRecord[i].depName; //} for (k=1;k<=3;k++){ for (j=0;j<2;j++){ if (myRecord[j].minmyRecord[j+1].min){ temp=myRecord[j].min; myRecord[j].min=myRecord[j+1].min; myRecord[j+1].min=temp; minfebDep=myRecord[j+1].depName; }}} } if (myRecord[i].month == "Mar"){ mar<< myRecord[i].depName<<"\t"< if (myRecord[i].month == "Apr"){ apr<< myRecord[i].depName<<"\t"< if (minaprmyRecord[i].min){ minapr=myRecord[i].min; minaprDep=myRecord[i].min;} } if (myRecord[i].month == "May"){ may< if (minmaymyRecord[i].min){ minmay=myRecord[i].min; minmayDep=myRecord[i].depName;} } if (myRecord[i].month == "Jun"){ jun<< myRecord[i].depName<<"\t"< if (minjunemyRecord[i].min){ minjune=myRecord[i].min; minjunDep=myRecord[i].depName;} } i++; myfile.close(); } minmax<<"department that has maximum spending at jan "< else{ cout << "Unable to open file"< } sorry inside that code ue#include should has iostream along with another two #include fstream and string,but at here it was treated as html tag,so i can't type it. my problem here is,I can't seems to get the minimum spending,I've try all I can but I'm still lingering on it,any idea??THANK YOU!

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  • hex dump of file in bash

    - by David Raswik
    How do I create a UNMODIFIED hex dump of a binary file in linux with bash? The od and hexdump commands both insert spaces in the dump, I DON'T WANT THIS, I need something that will simply write a long string with all the hex characters without inserting spaces or newlines in the output. How do I do this in bash?

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  • unformatted input to a std::string instead of c-string from binary file.

    - by posop
    ok i have this program working using c-strings. I am wondering if it is possible to read in blocks of unformatted text to a std::string? I toyed arround with if >> but this reads in line by line. I've been breaking my code and banging my head against the wall trying to use std::string, so I thought it was time to enlist the experts. Here's a working program you need to supply a file "a.txt" with some content to make it run. i tried to fool around with: in.read (const_cast<char *>(memblock.c_str()), read_size); but it was acting odd. I had to do std::cout << memblock.c_str() to get it to print. and memblock.clear() did not clear out the string. anyway, if you can think of a way to use STL I would greatly appreciate it. Here's my program using c-strings // What this program does now: copies a file to a new location byte by byte // What this program is going to do: get small blocks of a file and encrypt them #include <fstream> #include <iostream> #include <string> int main (int argc, char * argv[]) { int read_size = 16; int infile_size; std::ifstream in; std::ofstream out; char * memblock; int completed = 0; memblock = new char [read_size]; in.open ("a.txt", std::ios::in | std::ios::binary | std::ios::ate); if (in.is_open()) infile_size = in.tellg(); out.open("b.txt", std::ios::out | std::ios::trunc | std::ios::binary); in.seekg (0, std::ios::beg);// get to beginning of file while(!in.eof()) { completed = completed + read_size; if(completed < infile_size) { in.read (memblock, read_size); out.write (memblock, read_size); } // end if else // last run { delete[] memblock; memblock = new char [infile_size % read_size]; in.read (memblock, infile_size % read_size + 1); out.write (memblock, infile_size % read_size ); } // end else } // end while } // main if you see anything that would make this code better please feel free to let me know.

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  • How do you compile a resource into the binary?

    - by Wonderflonium
    How do you compile a resource into the binary in XCode? That way is doesn't show up inside the application bundle as a file and it's not subject to manipulation by a user (whether good-intentioned or bad). Is this even possible? I'm particularly interested about this in terms of iPhone apps. Any help is appreciated!

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  • looking for idea to embbed "book like view " in exe file

    - by user63898
    Hello all i have application that convert data structure from the GUI to doc/pdf/rtf/html ... files the structere logic contains the info about pages and data on each page so basccly i can convert it to every thing . but my problem is that i wish to convert this structure to some kind of book that is exe binary file . and i have no idea how or which ways i can do it ? can you give me some ideas or solutions on who to embed book into exe file Thanks

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  • Save binarydata into a image file in c# / silverlight 3

    - by Jin
    byte[] binaryData = new Byte[pngStream.Length]; long bytesRead = pngStream.Read(binaryData, 0, (int)pngStream.Length); string base64String = System.Convert.ToBase64String(binaryData, 0, binaryData.Length); I have a binary data in Byte array. Does anybody know how to save this into any image file (png or jpg) in silverlight3 or c#? Thanks

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