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Articles indexed in April 2010

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  • Windows with putty via USB serial cable to Linux serial port - output ok, input isn't

    - by Aharon Robbins
    I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5). I have /sbin/agetty -L 9600 ttyS0 in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control. I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but cat < /dev/ttyS0 just prints out weird characters from what I type. Any and all suggestions will be welcome. Thanks!

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  • MS Access 2003 - Format a Number with Commas AND Auto-Decimal

    - by Emtucifor
    On a report I have a control which is bound to a column which can have up to 3 decimal places. I want the number to format with commas separating thousands and millions, but I also want the number of decimal places to be automatic, so that if there is no decimal portion then no decimal at all is shown. 1234.567 -> 1,234.567 1234.560 -> 1,234.56 1234.500 -> 1,234.5 1234.000 -> 1,234 General format will give me the auto decimal places but no commas. Standard format gives the comma but is fixed to 2 decimal places. Doing my own =Format(Number, "#,##0.#") leaves the decimal point in and doesn't align properly, with extra space on the right of the number. Do I have to write my own VB function to give the format I want? It seems silly that Access (apparently) can't do this out of the box. This also seems really horrible: =Replace(Replace(Replace(Replace(Replace( _ Format(Number, "#,##0.000") & "x", "0x", ""), "0x", ""), "0x, ""), ".x", ""), "x", "")

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  • What is the difference between using MD5.Create and MD5CryptoServiceProvider?

    - by byte
    In the .NET framework there are a couple of ways to calculate an MD5 hash it seems, however there is something I don't understand; What is the distinction between the following? What sets them apart from eachother? They seem to product identical results: public static string GetMD5Hash(string str) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); byte[] bytes = ASCIIEncoding.Default.GetBytes(str); byte[] encoded = md5.ComputeHash(bytes); StringBuilder sb = new StringBuilder(); for (int i = 0; i < encoded.Length; i++) sb.Append(encoded[i].ToString("x2")); return sb.ToString(); } public static string GetMD5Hash2(string str) { System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create(); byte[] bytes = Encoding.Default.GetBytes(str); byte[] encoded = md5.ComputeHash(bytes); StringBuilder sb = new StringBuilder(); for (int i = 0; i < encoded.Length; i++) sb.Append(encoded[i].ToString("x2")); return sb.ToString(); }

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  • Adding Google Map to Contact Info Page in Drupal

    - by clang1234
    I'm trying to display a Google Map inside a drupal page. The map will only have the business location marker on it, with no need for a user to submitted their own markers. So far I've loaded the Gmap, Location, and CCK modules. I've attempted to enable a location field for Page content types, which allows me to input an address, but this doesn't display the actual map. I'm sure I'm missing something simple here. Any help?

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  • Is extending a base class with non-virtual destructor dangerous in C++

    - by Akusete
    Take the following code class A { }; class B : public A { }; class C : public A { int x; }; int main (int argc, char** argv) { A* b = new B(); A* c = new C(); //in both cases, only ~A() is called, not ~B() or ~C() delete b; //is this ok? delete c; //does this line leak memory? return 0; } when calling delete on a class with a non-virtual destructor with member functions (like class C), can the memory allocator tell what the proper size of the object is? If not, is memory leaked? Secondly, if the class has no member functions, and no explicit destructor behaviour (like class B), is everything ok? I ask this because I wanted to create a class to extend std::string, (which I know is not recommended, but for the sake of the discussion just bear with it), and overload the +=,+ operator. -Weffc++ gives me a warning because std::string has a non virtual destructor, but does it matter if the sub-class has no members and does not need to do anything in its destructor? -- FYI the += overload was to do proper file path formatting, so the path class could be used like class path : public std::string { //... overload, +=, + //... add last_path_component, remove_path_component, ext, etc... }; path foo = "/some/file/path"; foo = foo + "filename.txt"; //and so on... I just wanted to make sure someone doing this path* foo = new path(); std::string* bar = foo; delete bar; would not cause any problems with memory allocation

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  • Cannot run file_get_contents() on PHP 5.2.9-2

    - by Obay
    Hello, I am having the same problem as described below. http://marc.info/?l=php-general&m=124104032703506 The guy answered his own question by: "Sorry, didn't pay attention to the registered streams :-( You need to install a PHP package with ssl or compile it with --with-openssl." What does that mean? I'm fairly new to all this stuff and I don't quite understand what he was talking about, (e.g. registered streams, ssl). We have another server that has SSL. Does he mean that if I just transfer to that server, problem solved? Or is there anything else I need to consider? Can you please help me out? Any help is much appreciated :)

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  • i don't understand how...

    - by Hristo
    how can something print 3 times when it only goes the printing code twice? I'm coding in C and the code is in a SIGCHLD signal handler I created. void chld_signalHandler() { int pidadf = (int) getpid(); printf("pidafdfaddf: %d\n", pidadf); while (1) { int termChildPID = waitpid(-1, NULL, WNOHANG); if (termChildPID == 0 || termChildPID == -1) { break; } dll_node_t *temp = head; while (temp != NULL) { printf("stuff\n"); if (temp-pid == termChildPID && temp-type == WORK) { printf("inside if\n"); // read memory mapped file b/w WORKER and MAIN // get statistics and write results to pipe char resultString[256]; // printing TIME int i; for (i = 0; i < 24; i++) { sprintf(resultString, "TIME; %d ; %d ; %d ; %s\n",i,1,2,temp->stats->mboxFileName); fwrite(resultString, strlen(resultString), 1, pipeFD); } remove_node(temp); break; } temp = temp-next; } printf("done printing from sigchld \n"); } return; } the output for my MAIN process is this: MAIN PROCESS 16214 created WORKER PROCESS 16220 for file class.sp10.cs241.mbox pidafdfaddf: 16214 stuff stuff inside if done printing from sigchld MAIN PROCESS 16214 created WORKER PROCESS 16221 for file class.sp10.cs225.mbox pidafdfaddf: 16214 stuff stuff inside if done printing from sigchld and the output for the MONITOR process is this: MONITOR: pipe is open for reading MONITOR PIPE: TIME; 0 ; 1 ; 2 ; class.sp10.cs225.mbox MONITOR PIPE: TIME; 0 ; 1 ; 2 ; class.sp10.cs225.mbox MONITOR PIPE: TIME; 0 ; 1 ; 2 ; class.sp10.cs241.mbox MONITOR: end of readpipe ( I've taken out repeating lines so I don't take up so much space ) Thanks, Hristo

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  • Sorting numbers in string format with Python

    - by prosseek
    I have a list that has some chapter numbers in string. When I sort the keys using keys function, it gives me wrong results. keys = ['1.1', '1.2', '2.1', '10.1'] keys.sort() print keys ['1.1', '1.2', '10.1', '2.1'] How can I use the sort function to get ['1.1', '1.2', '2.1', '10.1'] What if the array has something like this? ['1.1.1', '1.2.1', '10.1', '2.1'] - ['1.1.1','1.2.1','2.1','10.1']

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  • Good reasons to migrate PHP libraries to namespaces

    - by Joseph Mastey
    I have a significant number of object libraries written for PHP 5.2.5, and I'm trying to weigh the benefits of retrofitting them for namespaces. I don't have any concerns about the server PHP version at the moment, since any relevant machines are under my control, so I'm not worried about backwards compatibility. As far as the structure of the libraries, I use the same convention as Zend Framework, (Library_Module_Class_Name e.g.) so I don't currently have any naming conflicts internal to the libraries. I'd anticipate moving the Library and Module parts of those classnames to namespaces. That said, if the code is already written, is there any good reason to move over to namespaces? Thanks, Joe

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  • CakePHP form $options['options']

    - by James
    Hey! Total CakePHP noob here. This is sort of a two fold question. In a view that is used for adding user objects I would like to use a drop down (selection) field in the form. Each user belongs to a group so when I add a user I want a drop down that contains all of the groups that the user could possibly join. Currently the group_id field is a textfield. I know how to force it to be a selection field, but I don't know how to populate the selection with the names of the groups programmatically. The Current method: echo $form->input('group_id', array( '1' => 'NameOfGroup1', '2' => 'NameOfGroup2', '3' => 'NameOfGroup3') ); I want to generate the options array programmatically though. echo $form->input('group_id', $this->Group->find('list')); This doesn't work though. I get an error: Undefined property: View::$Group [APP/views/users/add.ctp, line 8] To me this means that I don't have access to the Group object from inside my user view. How can I accomplish this? Again, I want to do it programmatically so that it updates as I add groups or remove them.

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  • Simplest way to automatically alter "const" value in Java during compile time

    - by Michael Mao
    Hi all: This is a question corresponds to my uni assignment so I am very sorry to say I cannot adopt any one of the following best practices in a short time -- you know -- assignment is due tomorrow :( link to Best way to alter const in Java on StackOverflow Basically the only task (I hope so) left for me is the performance tuning. I've got a bunch of predefined "const" values in my single-class agent source code like this: //static final values private static final long FT_THRESHOLD = 400; private static final long FT_THRESHOLD_MARGIN = 50; private static final long FT_SMOOTH_PRICE_IDICATOR = 20; private static final long FT_BUY_PRICE_MODIFIER = 0; private static final long FT_LAST_ROUNDS_STARTTIME = 90; private static final long FT_AMOUNT_ADJUST_MODIFIER = 5; private static final long FT_HISTORY_PIRCES_LENGTH = 10; private static final long FT_TRACK_DURATION = 5; private static final int MAX_BED_BID_NUM_PER_AUC = 12; I can definitely alter the values manually and then compile the code to give it another go around. But the execution time for a thorough "statistic analysis" usually requires over 2000 times of execution, which will typically lasts more than half an hour on my own laptop... So I hope there is a way to alter values using other ways than dig into the source code to change the "const" values there, so I can automatically distributed compiled code to other people's PC and let them run the statistic analysis instead. One other reason for a automatically value adjustment is that I can try using my own agent to defeat itself by choosing different "const" values. Although my values are derived from previous history and statistical results, they are far from the most optimized values. I hope there is a easy way so I can quickly adopt that so to have a good sleep tonight while the computer does everything for me... :) Any hints on this sort of stuff? Any suggestion is welcomed and much appreciated.

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  • Using <input type=file /> with J2EE/MySQL Backend

    - by Mark Hazlett
    Hey everyone, I'm wondering how I can hook up an input type=file to send a picture back to a backend servlet that will eventually be stored in a MySQL database as a BLOB? In other words, how can I upload a picture using the input and send that back to the servlet to insert into the database as a BLOB type? Thanks

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  • Break the nested(double) loop in python

    - by prosseek
    I use the following method to break the double loop in Python. for word1 in buf1: find = False for word2 in buf2: ... if res == res1: print "BINGO " + word1 + ":" + word2 find = True if find: break Is there better way to break the double loop?

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  • how to implement more functionality in webpage

    - by trans
    Dear All, I have a website in front page i m displaying 5 records ,for different options,i want that when user licks more he should be able to view next records.i would i keep track as whicg list has already been shown to user,since i m using an arraylist,can i ipmlement it through that.

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  • Get the last N rows in the database in order?

    - by Kristopher
    Let's say I have the following database table: record_id | record_date | record_value -----------+-------------+-------------- 1 | 2010-05-01 | 195.00 2 | 2010-07-01 | 185.00 3 | 2010-09-01 | 175.00 4 | 2010-05-01 | 189.00 5 | 2010-06-01 | 185.00 6 | 2010-07-01 | 180.00 7 | 2010-08-01 | 175.00 8 | 2010-09-01 | 170.00 9 | 2010-10-01 | 165.00 I want to grab the last 5 rows with the data ordered by record_date ASC. This is easy to do with: SELECT * FROM mytable ORDER BY record_date ASC LIMIT 5 OFFSET 4 Which would give me: record_id | record_date | record_value -----------+-------------+-------------- 6 | 2010-07-01 | 180.00 7 | 2010-08-01 | 175.00 3 | 2010-09-01 | 175.00 8 | 2010-09-01 | 170.00 9 | 2010-10-01 | 165.00 But how do I do this when I don't know how many records there are and can't compute the magic number of 4? I've tried this query, but if there are less than 5 records, it results in a negative OFFSET, which is invalid: SELECT * FROM mytable ORDER BY record_date ASC LIMIT 5 OFFSET (SELECT COUNT(*) FROM mytable) - 5; So how do I accomplish this?

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  • How do I close a database connection being used to produce a streaming result in a WCF service?

    - by Dan
    I have been unable to find any documentation on properly closing database connections in WCF service operations. I have a service that returns a streamed response through the following method. public virtual Message GetData() { string sqlString = BuildSqlString(); SqlConnection conn = Utils.GetConnection(); SqlCommand cmd = new SqlCommand(sqlString, conn); XmlReader xr = cmd.ExecuteXmlReader(); Message msg = Message.CreateMessage( OperationContext.Current.IncomingMessageVersion, GetResponseAction(), xr); return msg; } I cannot close the connection within the method or the streaming of the response message will be terminated. Since control returns to the WCF system after the completion of that method, I don't know how I can close that connection afterwards. Any suggestions or pointers to additional documentation would be appreciated.

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  • If you are forced to use an Anemic domain model, where do you put your business logic and calculated

    - by Jess
    Our current O/RM tool does not really allow for rich domain models, so we are forced to utilize anemic (DTO) entities everywhere. This has worked fine, but I continue to struggle with where to put basic object-based business logic and calculated fields. Current layers: Presentation Service Repository Data/Entity Our repository layer has most of the basic fetch/validate/save logic, although the service layer does a lot of the more complex validation & saving (since save operations also do logging, checking of permissions, etc). The problem is where to put code like this: Decimal CalculateTotal(LineItemEntity li) { return li.Quantity * li.Price; } or Decimal CalculateOrderTotal(OrderEntity order) { Decimal orderTotal = 0; foreach (LineItemEntity li in order.LineItems) { orderTotal += CalculateTotal(li); } return orderTotal; } Any thoughts?

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  • Happy Birthday

    Today marks a special day for us on the App Engine team. It was just thirty-six years ago today that IBM announced the IBM System/360 . As Wikipedia...

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  • Mapping Left Alt key in vim?

    - by Yogesh Arora
    I am able to map the key combination Right Alt+Left Arrow with <a-left> or by <m-left>. But I am not able to map the Left Alt key. Is there a way to do that? Edit: Just to clarity <a-left> means Alt+Left Arrow. The important question here is what is difference between Left Alt and Right Alt from the perspective of keymappings in Vim?

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  • How to connect an existing wizard generated data set to a different server(same database) at run tim

    - by Kiril
    Hello, I am coding a simple space empire management game in Visual C# 2008, which relies on connecting to a remote SQL server database to get/store data. I would like the user to be able to connect to a user-specified SQL server from the login screen(he specifies IP address, port, database name, ID, password and presses "connect" button). However, I found out that the Dataset connection string property is read only and cannot be changed. Is there any way to guide the wizard-generated DataSet to a user-specified server at run time? Thanks in advance.

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  • Dynamic URL -> Controller mapping for routes in Rails

    - by Daniel Beardsley
    I would like to be able to map URLs to Controllers dynamically based on information in my database. I'm looking to do something functionally equivalent to this (assuming a View model): map.route '/:view_name', :controller => lambda { View.find_by_name(params[:view_name]).controller } Others have suggested dynamically rebuilding the routes, but this won't work for me as there may be thousands of Views that map to the same Controller

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  • Make dictionary from list with python

    - by prosseek
    I need to transform a list into dictionary as follows. The odd elements has the key, and even number elements has the value. x = (1,'a',2,'b',3,'c') - {1: 'a', 2: 'b', 3: 'c'} def set(self, val_): i = 0 for val in val_: if i == 0: i = 1 key = val else: i = 0 self.dict[key] = val My solution seems to long, is there a better way to get the same results?

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