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• Is there a C# open-source search app which scales cheaply?

  - by domspurling

  I need to quickly replace a listings website which has the following characteristics: smallish database (10,000 items, < 1GB) < 10% of the items updated/created/removed daily most common activity is searching the whole dataset, returning 1-1000 items traffic peaks at 1m page impressions per day Scaling strategy for the existing app has been to separate read-only and read/write activity. Multiple slave databases are used for searching and writes are done to a master, which update the slaves using MS SQL replication. Since read activity is more common than write, this has proved to be a cheap way to do database load balancing, without true clustering. I now need to replace the app - are there any C# open-source apps which scale as neatly as this?

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• App Engine webapp.RequestHandler child instances has no self.request during __init__

  - by grucha

  i use modified webapp.RequestHandler for handling requests in my app: class MyRequestHandler(webapp.RequestHandler): """ Request handler with some facilities like user. self.out is the dictionary to pass to templates """ def __init__(self, *args, **kwargs): super(MyRequestHandler, self).__init__(*args, **kwargs) self.out = { 'user': users.get_current_user(), 'logout_url': users.create_logout_url(self.request.uri) } def render(self, template_name): """ Shortcut to render templates """ self.response.out.write(template.render(template_name, self.out)) class DeviceList(MyRequestHandler): def get(self): self.out['devices'] = GPSDevice.all().fetch(1000) self.render('templates/device_list.html') but I get an exception: line 28, in __init__ self.out['logout_url'] = users.create_logout_url(self.request.uri) AttributeError: 'DeviceList' object has no attribute 'request' When the code causing exception is moved out of __init__ everything's fine: class MyRequestHandler(webapp.RequestHandler): """ Request handler with some facilities like user. self.out is the dictionary to pass to templates and initially it contains user object for example """ def __init__(self, *args, **kwargs): super(MyRequestHandler, self).__init__(*args, **kwargs) self.out = { 'user': users.get_current_user(), } def render(self, template_name): """ Shortcut to render templates """ self.out['logout_url'] = users.create_logout_url(self.request.uri) self.response.out.write(template.render(template_name, self.out)) Whi is that? Why there's no self.request after parent's (i.e. webapp.RequestHandler's) __init__ was executed?

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• Pattern Matching in Scheme

  - by kunjaan

  How do I accept the following input? (list of 0 or more charcters and ends with 3) or (list of 1 or more characters 4 and 0 or more characters after 4) something like (match ( list 3)) -> #t (match ( list 1 2 3)) -> #t (match (list 1 2 3 4)) -> #t (match (list 1 2 3 4 5)) -> #t (match (list 4)) -> #f EDIT: THIS IS NOT MY HOMEWORK. I trying to write something like ELIZA from PAIP but I know only how to write a pattern that begins with a word.

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• How to fake Azure Table Storage in .NET for Unit Testing?

  - by Erick T

  I am working on a system that uses Azure Table Storage. In other systems (e.g., SQL, File based, etc), I can write a fake that allows me to test my data persistence logic. However, I can't see an easy way to create a fake for the Azure Table Service. I could create a new IIS project that behaves the same way, but that isn't a good way to write a unit test, it is more of an integration test. Any thoughts on how to unit test data access code that uses the Azure Table Storage client? Thanks, Erick

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• c# copy constructor generator

  - by Shawn Mclean

  I want to copy values from one object to another object. Something similiar to pass by value but with assignment. Eg. PushPin newValPushPin = oldPushPin; //I want to break the reference here. I was told to write a copy constructor for this. But this class has alot of properties, it will probably take an hour to write a copy constructor by hand. Is there a better way to assign an object to another object by value? If not, is there a copy constructor generator?

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• Python nested function scopes

  - by Thomas O

  I have code like this: def write_postcodes(self): """Write postcodes database. Write data to file pointer. Data is ordered. Initially index pages are written, grouping postcodes by the first three characters, allowing for faster searching.""" status("POSTCODE", "Preparing to sort...", 0, 1) # This function returns the key of x whilst updating the displayed # status of the sort. ctr = 0 def keyfunc(x): ctr += 1 status("POSTCODE", "Sorting postcodes", ctr, len(self.postcodes)) return x sort_res = self.postcodes[:] sort_res.sort(key=keyfunc) But ctr responds with a NameError: Traceback (most recent call last): File "PostcodeWriter.py", line 53, in <module> w.write_postcodes() File "PostcodeWriter.py", line 47, in write_postcodes sort_res.sort(key=keyfunc) File "PostcodeWriter.py", line 43, in keyfunc ctr += 1 UnboundLocalError: local variable 'ctr' referenced before assignment How can I fix this? I thought nester scopes would have allowed me to do this. I've tried with 'global', but it still doesn't work.

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• Stream a file to the HTTP response in Pylons

  - by Evgeny

  I have a Pylons controller action that needs to return a file to the client. (The file is outside the web root, so I can't just link directly to it.) The simplest way is, of course, this: with open(filepath, 'rb') as f: response.write(f.read()) That works, but it's obviously inefficient for large files. What's the best way to do this? I haven't been able to find any convenient methods in Pylons to stream the contents of the file. Do I really have to write the code to read a chunk at a time myself from scratch?

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• Writing temporary data from R

  - by Shane

  I want to write some temporary data to disk in an R package, and I want to be sure that it can run on every OS without assuming the user has admin rights. Is there an existing R function that can provide a path to a temporary directory on all major OS's? Or a way to reference a user's home directory? Otherwise, I was thinking of trying this: Sys.getenv("temp") I presume that I can't expect people to have write access to their R locations, otherwise I could reference a path within the package directory: .find.package("package.name").

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• How to pass email from one form to another page's form with javascript

  - by zac

  I am trying to have an email signup form on one page populate the email block on another page by passing it through the url and pulling it out with document.write. The first form is something like: <form action="/sign-up"> <input type="text" name="passEmail"><input type="submit"></form> And the recieving form is like : <form name="theForm"> <input type='text' name='email'></form> And I am trying a script like this <SCRIPT LANGUAGE="javascript"> var locate = window.location document.theForm.email.value = locate var text = document.theForm.email.value function delineate(str) { theEmail = str.indexOf("=") + 1; return(str.substring(theEmail)); } document.write(delineate(text)); </SCRIPT> Instead of pulling the email after the = in the url it is pulling the entire url. Can someone help me accomplish this?

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• Concatenating rows from different tables into one field

  - by Markus

  Hi! In a project using a MSSQL 2005 Database we are required to log all data manipulating actions in a logging table. One field in that table is supposed to contain the row before it was changed. We have a lot of tables so I was trying to write a stored procedure that would gather up all the fields in one row of a table that was given to it, concatenate them somehow and then write a new log entry with that information. I already tried using FOR XML PATH and it worked, but the client doesn't like the XML notation, they want a csv field. Here's what I had with FOR XML PATH: DECLARE @foo varchar(max); SET @foo = (SELECT * FROM table WHERE id = 5775 FOR XML PATH('')); The values for "table", "id" and the actual id (here: 5775) would later be passed in via the call to the stored procedure. Is there any way to do this without getting XML notation and without knowing in advance which fields are going to be returned by the SELECT statement?

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• graphviz segmentation fault

  - by LucaB

  Hi I'm building a graph with many nodes, around 3000. I wrote a simple python program to do the trick with graphviz, but it gives me segmentation fault and I don't know why, if the graph is too big or if i'm missing something. The code is: #!/usr/bin/env python # Import graphviz import sys sys.path.append('..') sys.path.append('/usr/lib/graphviz') import gv # Import pygraph from pygraph.classes.graph import graph from pygraph.classes.digraph import digraph from pygraph.algorithms.searching import breadth_first_search from pygraph.readwrite.dot import write # Graph creation gr = graph() file = open('nodes.dat', 'r') line = file.readline() while line: gr.add_nodes([line[0:-1]]) line = file.readline() file.close() print 'nodes finished, beginning edges' edges = open('edges_ok.dat', 'r') edge = edges.readline() while edge: gr.add_edge((edge.split()[0], edge.split()[1])) edge = edges.readline() edges.close() print 'edges finished' print 'Drawing' # Draw as PNG dot = write(gr) gvv = gv.readstring(dot) gv.layout(gvv,'dot') gv.render(gvv,'svg','graph.svg') and it crashes at the gv.layout() call. The files are somthing like: nodes: node1 node2 node3 edges_ok: node1 node2 node2 node3

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• Possible to load an Enum based on a string name?

  - by Cooter

  OK, I don't think the title says it right... but here goes: I have a class with about 40 Enums in it. i.e: Class Hoohoo { public enum aaa : short { a = 0, b = 3 } public enum bbb : short { a = 0, b = 3 } public enum ccc : short { a = 0, b = 3 } } Now say I have a Dictionary of strings and values, and each string is the name of above mentioned enums: Dictionary<string,short>{"aaa":0,"bbb":3,"ccc":0} I need to change "aaa" into HooBoo.aaa to look up 0. Can't seem to find a way to do this since the enum is static. Otherwise I'll have to write a method for each enum to tie the string to it. I can do that but thats mucho code to write. Thanks, Cooter

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• Who pays developers of open-source software?

  - by darko petreski

  We are facing a lot of open source software. But someone needs to write that software. How are they payed? Do you know a good article about the open source politics and economy? Sometimes the big companies themselves release open source because they have some benefits. Then they sell support, advices ... My question is what is the real economy about open software? No professional will work for nothing. This software are couple of classes but thousand or may be millions of classes. If you are really a pro you will write software for money, because you have life, wife, kids, taxes, you must earn. Please do not tell me that they are doing this for pleasure or hobby!

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• Displaying Error Page based on the error exception?

  - by Ramesh

  I am using the exception catching procedure which is the module to track the errors and it write the error description in a log file in the server.I want to display the error details in a common Error page which is having a multi-line textbox from the common function in the module.Is it possible to do that.If possible,How can I do that.... Try ;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;; Catch ex as exception CreateLogFile(Ex) End Try The above description is the error catching portion from the code In the module I have written the CreateLogFile function which write the log file. I want to display the Error Page after writing the log file which should contain the error details.... Please Help...?.

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• Windows cmd.exe output in PowerShell

  - by noledgeispower

  I have a script for remotely executing commands on other machines, however... when using windows cmd.exe commands It does not write to the file on the remote server. Here is the code. $server = 'serverName' $Username = 'userName' $Password = 'passWord' $cmd = "cmd /c ipconfig" ######################## ######################## $ph = "C:\mPcO.txt" $rph = "\\$server\C$\mPcO.txt" $cmde = "$cmd > $ph" $pass = ConvertTo-SecureString -AsPlainText $Password -Force $mycred = new-object -typename System.Management.Automation.PSCredential -argumentlist "$Username",$pass Invoke-WmiMethod win32_process -name create -ComputerName $server -ArgumentList $cmde Credential $mycred cmd /c net use \\$server\C$ $password /USER:$username Get-Content $rph Remove-Item $rph cmd /c net use \\$server\C$ /delete As you can see we simply write $cmde = "$cmd > $ph" if I use a PowerShell command I use $cmde = "$cmd | Out-File $ph" and it works fine. Any advice Appreciated

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• IIS7 Modules - managed or native?

  - by Simon Linder

  Hi all, as the old ISAPI filters are going to die sooner or later, I want to rewrite an old ISAPI filter that was used in IIS 6 into a module for use in IIS 7. The module will be used globally, meaning it will be used within each site, on a Windows Server 2008 R2 with IIS 7.5 installed, that will host several thousand web sites and managing about 50 application pools. My question now is if I should write that module in managed or unmanaged code? One of my concerns regarding managed code is the massive memory consumption due to the .NET framework overhead. I don't know how this would effect the server's performance. I already wrote modules in managed as well as in unmanaged code. So this is not the bothering my decision. But I would prefer to write the module in C# if there are no huge drawbacks. Any suggestions about that issue?

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• echo newline suppression

  - by Happy Mittal

  Why $echo '-n' doesn't write -n on terminal although -n is written within quotes ?

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• What is the point in using a "real" database modeling tool?

  - by cdeszaq

  We currently have a 10 year old nasty, spaghetti-code-style SQL Server database that we are soon looking to pretty much re-write from scratch as part of a re-write to a large web application. (The existing application will serve as the functional requirements for the next incarnation of the app). Some have suggested we use Visio to do all the diagramming and to generate the DDL, but others have suggested we use a dedicated database design tool, rather than a diagramming tool that is able to export DDL. Is there any benefit to using "real" DB design tools, such as ModelRight, over general tools like Visio? If so, what are those specific benefits? Edit: In a nutshell, what can real/dedicated tools do that something like Visio can't, and how much do these capabilities matter (from a best-practices standpoint, for example)

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• Flex 3 / Air: Writing blank new lines to files using FileStream

  - by Edward

  I want to write some text directly to a file using Flex 3 / Air. The text on the file (call it "Database.txt") must have the following format: Line1 Line2 Line3 var FS:FileStream = new FileStream(); var DatabaseFile:File = File.desktopDirectory.resolvePath("Database.txt"); FS.open(DatabaseFile, FileMode.WRITE); FS.writeUTFBytes("Line1" + "\n" + "Line2" + "\n" + "Line3"); FS.close(); But it writes the following text to the file: Line1 Line2 Line3. I'm pretty sure I'm making a very dummy error, but I cannot figure out what it is. Can anyone help me? Thank you for your time :)

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• A web framework where AJAX was not an after thought

  - by Pirate for Profit

  AJAX is a pain in the ass because it essentially means you'll have to write two sets of similarish code: one for browsers with JavaScript enabled and those without. Not only this, but you have to connect JavaScript events to hook into your models and display the results. And if all that weren't bad enough, you need to send an address change with the request, otherwise the user won't be able to "click back" correctly (if confused look at what happens to the address bar when you click links in GMail). We're searching for something that had the foresight and design goals with all these concerns in mind. Performance and security are also obvious major concerns. We love config-based systems as well, where you don't have to write a lot of code you just drop it into an easily read config format. It's like asking for the holy grail right?

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• Calculating next date in Turbo Pascal

  - by Chaima Chaimouta

  program date; uses wincrt; var m,ch,ch1,ch2,ch3: string ; mois,j,a,b: integer ; begin write('a');read(a); write('j');read(j); write('mois');read(mois); case mois of 1,3,5,7,8,10: if j<31 then begin b:=j+1; m:=str(b,ch)+'/'+str(mois,ch2)+'/'+str(a,ch3); else if j=31then b:=1; s:=mois+1; m:=concat(str(b,ch),'/',str(s,ch2),'/',str(a,ch3)); end else m:='erreur'; 4,6,9,11:if j<30 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2),'/',str(a,ch3)); end else j=30 then begin b:=1; s:=mois+1; m:=concat(str(b,ch),'/',str(mois,ch2),'/',str(a,ch3)); end else m:='erreur'; 2:if j<28 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2),'/',str(a,ch3)); end else if j=28 then begin b:=1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else if((a mod 4=0)AND (a mod 100<>0)) or ((a mod 100=0)and(a mod 400=0)) then if j<29 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else if j=29 then begin b:=1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else m:='erreur'; 12:if j<31 then begin b:=j+1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(a,ch3)); end else if j=31 then begin b:=1; s:=a+1; m:=concat(str(b,ch),'/',str(mois,ch2,'/',str(s,ch3)); end; writeln(m); end. this is my program i hope you be able to help me

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• Vbscript / webcam. using flash API - Save streaming file as image

  - by remi

  Hi. Based on a php app we've tried to developp our own webapp in vbscript. All is working well. The camera starts, etc.. The problem we're left with is the following: the flash API is streaming the content of the video to a webpage, this page saves the photo as a jpg. The PHP code we're trying to emulate is as follow $str = file_get_contents("php://input"); file_put_contents("/tmp/upload.jpg", pack("H*", $str)); After intensive googling the best we can come up with is Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Dim sImagePath As String = Server.MapPath("/registration/") & "test.jpg" Dim data As Byte() = Request.BinaryRead(Request.TotalBytes) Dim Ret As Array Dim imgbmp As New System.Drawing.Bitmap("test.jpg") Dim ms As MemoryStream = New MemoryStream(data) imgbmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg) Ret = ms.ToArray() Dim fs As New FileStream(sImagePath, FileMode.Create, FileAccess.Write) fs.Write(Ret, 0, Ret.Length) fs.Flush() fs.Close() End Sub which is not working, does anybody have any suggestion?

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• writing header in csv python with DictWriter

  - by user248237

  assume I have a csv.DictReader object and I want to write it out as a csv file. How can I do this? I thought of the following: dr = csv.DictReader(open(f), delimiter='\t') # process my dr object # ... # write out object output = csv.DictWriter(open(f2, 'w'), delimiter='\t') for item in dr: output.writerow(item) Is that the best way? More importantly, how can I make it so a header is written out too, in this case the object "dr"s .fieldnames property? thanks.

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• How would you communicate with aliens as a computer scientist?

  - by Pyrolistical

  Let's say aliens arrive on Earth and instead of just sending mathematicians and linguistic experts governments around the work decide to send an expert of major field. After a quick round of sorting you are paired up with an alien computer scientist. Given you don't understand each others language how would you using computer science to start the ground work of communication? eg. We know binary is universal, but not the way we write it. The symbols are not universal nor is the the direction we write it (MSB vs LSB and left vs right) Assume aliens are "similar" to us physically it won't impede visual communication.

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• try...else...except syntax error

  - by iform

  I can't understand this... Cannot get this code to run and I've no idea why it is a syntax error. try: newT.read() #existingArtist = newT['Exif.Image.Artist'].value #existingKeywords = newT['Xmp.dc.subject'].value except KeyError: print "KeyError" else: #Program will NOT remove existing values newT.read() if existingArtist != "" : newT['Exif.Image.Artist'] = artistString print existingKeywords keywords = os.path.normpath(relativePath).split(os.sep) print keywords newT['Xmp.dc.subject'] = existingKeywords + keywords newT.write() except: print "Cannot write tags to ",filePath Syntax error occurs on the last "except:". Again...I have no idea why python is throwing a syntax error (spent ~3hrs on this problem).

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