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  • How to combine RewriteRule of index.php and queries rewrite and avoid Server Error 404?

    - by Binyamin
    Both RewriteRule's works fine, except when used together. 1.Remove all queries except query ?callback=.*: # /api?callback=foo has no rewrite # /whatever?whatever=foo has 301 redirect /whatever RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^?#\ ]*)\?[^\ ]*\ HTTP/ [NC] RewriteCond %{REQUEST_URI}?%{QUERY_STRING} !/api(/.*)?\?callback=.* RewriteRule .*$ %{REQUEST_URI}? [R=301,L] 2.Rewrite index.php queries api and url=$1: # /api returns data index.php?api&url= # /api/whatever returns data index.php?api&url=whatever RewriteRule ^api(?:/([^/]*))?$ index.php?api&url=$1 [QSA,L] RewriteRule ^([^.]*)$ index.php?url=$1 [QSA,L] Any valid combination to this RewriteRule's on keeping its functionality? This combination will return Server Error 404 to /api/?callback=foo: # Remove all queries except query "callback" RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^?#\ ]*)\?[^\ ]*\ HTTP/ [NC] RewriteCond %{REQUEST_URI}?%{QUERY_STRING} !/api(/.*)?\?callback=.* RewriteRule .*$ %{REQUEST_URI}? [R=301,L] # Rewrite index.php queries RewriteCond %{REQUEST_URI}?%{QUERY_STRING} !/api(/.*)?\?callback=.* # Server Error 404 on /api/?callback=foo and /api/whatever?callback=foo RewriteRule ^api(?:/([^/]*))?$ index.php?api&url=$1 [QSA,L] RewriteCond %{REQUEST_URI}?%{QUERY_STRING} !/api(/.*)?\?callback=.* RewriteRule ^([^.]*)$ index.php?url=$1 [QSA,L]

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  • What could cause a sudden stop in Box2D?

    - by alexanderpine
    I'm using Box2d for a game, and I have a bug that's driving me nuts. I've simplified the situation down to a square player sliding back and forth frictionlessly on top of a floor composed of a series of square tiles, driven by the left and right keys (which apply a horizontal force). Works great, sliding back and forth across the whole floor. Except... Every once in a while, the player will suddenly stick at the edge of one of the tiles as if it is hitting a (nonexistent) wall. Further pushes in the same direction it was traveling will fail, but as soon as I push backwards once in the opposite direction, I can push forwards past the sticking point again. The sticking point seems to be random, except for being on the edge of a tile. Happens while going left or right. For debugging purposes, I keep the Positions/velocity values for the previous two update ticks and print them out when this stop occurs. As an example, here you see the player moving right, decelerating slightly; pos2 should be about 8.7, but it stops dead instead. tick0: pos= 8.4636 vel= 7.1875 tick1: pos= 8.5816 vel= 7.0833 tick2: pos= 8.5816 vel= 0.0000 So, as the player is 0.8 and the tiles 1.0 wide, the player is stopping just as it is about to cross onto the next tile (8.5816 + 0.8/2 = 8.9816). In fact, I get a collision message (which I ignore except noting that it happened). It only seems to happen at x.5816 (or -x.4184) while moving right, and x.4167 (or -x.5833) while moving left I said that it's like hitting a wall, but in fact, when it hits a wall, the numbers look more like: tick0: pos0= 12.4131 vel2= 8.4375 tick1: pos1= 12.5555 vel1= 8.5417 tick2: pos2= 12.5850 vel0= 0.0000 so it moves further right on the last tick, which puts it in contact with the wall. Anyone seen anything like this. Any suggestion on how I could be causing this behavior.

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  • Socket connection to a telnet-based server hangs on read

    - by mixwhit
    I'm trying to write a simple socket-based client in Python that will connect to a telnet server. I can test the server by telnetting to its port (5007), and entering text. It responds with a NAK (error) or an AK (success), sometimes accompanied by other text. Seems very simple. I wrote a client to connect and communicate with the server, but it hangs on the first attempt to read the response. The connection is successful. Queries like getsockname and getpeername are successful. The send command returns a value that equals the number of characters I'm sending, so it seems to be sending correctly. But in the end, it always hangs when I try to read the response. I've tried using both file-based objects like readline and write (via socket.makefile), as well as using send and recv. With the file object I tried making it with "rw" and reading and writing via that object, and later tried one object for "r" and another for "w" to separate them. None of these worked. I used a packet sniffer to watch what's going on. I'm not versed in all that I'm seeing, but during a telnet session I can see my typed text and the server's text coming back. During my Python socket connection, I can see my text going to the server, but packets back don't seem to have any text in them. Any ideas on what I'm doing wrong, or any strategies to try? Here's the code I'm using (in this case, it's with send and recv): #!/usr/bin/python host = "localhost" port = 5007 msg = "HELLO EMC 1 1" msg2 = "HELLO" import socket import sys try: skt = socket.socket(socket.AF_INET, socket.SOCK_STREAM) except socket.error, e: print("Error creating socket: %s" % e) sys.exit(1) try: skt.connect((host,port)) except socket.gaierror, e: print("Address-related error connecting to server: %s" % e) sys.exit(1) except socket.error, e: print("Error connecting to socket: %s" % e) sys.exit(1) try: print(skt.send(msg)) print("SEND: %s" % msg) except socket.error, e: print("Error sending data: %s" % e) sys.exit(1) while 1: try: buf = skt.recv(1024) print("RECV: %s" % buf) except socket.error, e: print("Error receiving data: %s" % e) sys.exit(1) if not len(buf): break sys.stdout.write(buf)

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  • Spikes in Socket Performance

    - by Harun Prasad
    We are facing random spikes in high throughput transaction processing system using sockets for IPC. Below is the setup used for the run: The client opens and closes new connection for every transaction, and there are 4 exchanges between the server and the client. We have disabled the TIME_WAIT, by setting the socket linger (SO_LINGER) option via getsockopt as we thought that the spikes were caused due to the sockets waiting in TIME_WAIT. There is no processing done for the transaction. Only messages are passed. OS used Centos 5.4 The average round trip time is around 3 milli seconds, but some times the round trip time ranges from 100 milli seconds to couple of seconds. Steps used for Execution and Measurement and output Starting the server $ python sockServerLinger.py /dev/null & Starting the client to post 1 million transactions to the server. And logs the time for a transaction in the client.log file. $ python sockClient.py 1000000 client.log Once the execution finishes the following command will show the execution time greater than 100 milliseconds in the format <line_number>:<execution_time>. $ grep -n "0.[1-9]" client.log | less Below is the example code for Server and Client. Server # File: sockServerLinger.py import socket, traceback,time import struct host = '' port = 9999 l_onoff = 1 l_linger = 0 lingeropt = struct.pack('ii', l_onoff, l_linger) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, lingeropt) s.bind((host, port)) s.listen(1) while 1: try: clientsock, clientaddr = s.accept() print "Got connection from", clientsock.getpeername() data = clientsock.recv(1024*1024*10) #print "asdasd",data numsent=clientsock.send(data) data1 = clientsock.recv(1024*1024*10) numsent=clientsock.send(data) ret = 1 while(ret>0): data1 = clientsock.recv(1024*1024*10) ret = len(data) clientsock.close() except KeyboardInterrupt: raise except: print traceback.print_exc() continue Client # File: sockClient.py import socket, traceback,sys import time i = 0 while 1: try: st = time.time() s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) while (s.connect_ex(('127.0.0.1',9999)) != 0): continue numsent=s.send("asd"*1000) response = s.recv(6000) numsent=s.send("asd"*1000) response = s.recv(6000) i+=1 if i == int(sys.argv[1]): break except KeyboardInterrupt: raise except: print "in exec:::::::::::::",traceback.print_exc() continue print time.time() -st

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  • Simplest way to handle and display errors in a Python Pylons controller without a helper class

    - by ensnare
    I have a class User() that throw exceptions when attributes are incorrectly set. I am currently passing the exceptions from the models through the controller to the templates by essentially catching exceptions two times for each variable. Is this a correct way of doing it? Is there a better (but still simple) way? I prefer not to use any third party error or form handlers due to the extensive database queries we already have in place in our classes. Furthermore, how can I "stop" the chain of processing in the class if one of the values is invalid? Is there like a "break" syntax or something? Thanks. >>> u = User() >>> u.name = 'Jason Mendez' >>> u.password = '1234' Traceback (most recent call last): File "<stdin>", line 1, in <module> File "topic/model/user.py", line 79, in password return self._password ValueError: Your password must be greater than 6 characters In my controller "register," I have: class RegisterController(BaseController): def index(self): if request.POST: c.errors = {} u = User() try: u.name = c.name = request.POST['name'] except ValueError, error: c.errors['name'] = error try: u.email = c.email = request.POST['email'] except ValueError, error: c.errors['email'] = error try: u.password = c.password = request.POST['password'] except ValueError, error: c.errors['password'] = error try: u.commit() except ValueError, error: pass return render('/register.mako')

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  • cant download youtube video

    - by dsaccount1
    I'm having trouble retrieving the youtube video automatically, heres the code. The problem is the last part. download = urllib.request.urlopen(download_url).read() # Youtube video download script # 10n1z3d[at]w[dot]cn import urllib.request import sys print("\n--------------------------") print (" Youtube Video Downloader") print ("--------------------------\n") try: video_url = sys.argv[1] except: video_url = input('[+] Enter video URL: ') print("[+] Connecting...") try: if(video_url.endswith('&feature=related')): video_id = video_url.split('www.youtube.com/watch?v=')[1].split('&feature=related')[0] elif(video_url.endswith('&feature=dir')): video_id = video_url.split('www.youtube.com/watch?v=')[1].split('&feature=dir')[0] elif(video_url.endswith('&feature=fvst')): video_id = video_url.split('www.youtube.com/watch?v=')[1].split('&feature=fvst')[0] elif(video_url.endswith('&feature=channel_page')): video_id = video_url.split('www.youtube.com/watch?v=')[1].split('&feature=channel_page')[0] else: video_id = video_url.split('www.youtube.com/watch?v=')[1] except: print("[-] Invalid URL.") exit(1) print("[+] Parsing token...") try: url = str(urllib.request.urlopen('http://www.youtube.com/get_video_info?&video_id=' + video_id).read()) token_value = url.split('video_id='+video_id+'&token=')[1].split('&thumbnail_url')[0] download_url = "http://www.youtube.com/get_video?video_id=" + video_id + "&t=" + token_value + "&fmt=18" except: url = str(urllib.request.urlopen('www.youtube.com/watch?v=' + video_id)) exit(1) v_url=str(urllib.request.urlopen('http://'+video_url).read()) video_title = v_url.split('"rv.2.title": "')[1].split('", "rv.4.rating"')[0] if '&quot;' in video_title: video_title = video_title.replace('&quot;','"') elif '&amp;' in video_title: video_title = video_title.replace('&amp;','&') print("[+] Downloading " + '"' + video_title + '"...') try: print(download_url) file = open(video_title + '.mp4', 'wb') download = urllib.request.urlopen(download_url).read() print(download) for line in download: file.write(line) file.close() except: print("[-] Error downloading. Quitting.") exit(1) print("\n[+] Done. The video is saved to the current working directory(cwd).\n")

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  • How to Return Variable for all tests to use Unittest

    - by chrissygormley
    Hello, I have a Python script and I am trying to set a variable so that if the first test fail's the rest of then will be set to fail. The script I have so far is: class Tests(): def function: result function.......... def errorHandle(self): return self.error def sudsPass(self): try: result = self.client.service.GetStreamUri(self.stream, self.token) except suds.WebFault, e: assert False except Exception, e: pass finally: if 'result' in locals(): self.error = True self.errorHandle() assert True else: self.error = False self.errorHandle() assert False def sudsFail(self): try: result = self.client.service.GetStreamUri(self.stream, self.token) except suds.WebFault, e: assert False except Exception, e: pass finally: if 'result' in locals() or self.error == False: assert False else: assert True class GetStreamUri(TestGetStreamUri): def runTest(self): self.sudsPass() class GetStreamUriProtocolFail(TestGetStreamUri): def runTest(self): self.stream.Transport.Protocol = "NoValue" self.errorHandle() self.sudsFail() if __name__ == '__main__': unittest.main() I am trying to get self.error to be set to False if the first test fail. I understand that it is being set in another test but I was hoping someone could help me find a solution to this problem using some other means. Thanks PS. Please ignore the strange tests. There is a problem with the error handling at the moment.

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  • How Can I Find a List of All Exceptions That a Given Library Function Throws in Python?

    - by b14ck
    Sorry for the long title, but it seems most descriptive for my question. Basically, I'm having a difficult time finding exception information in the official python documentation. For example, in one program I'm currently writing, I'm using the shutil libary's move function: from shutil import move move('somefile.txt', '/tmp/somefile.txt') That works fine, as long as I have write access to /tmp/, there is enough diskspace, and if all other requirements are satisfied. However, when writing generic code, it is often difficult to guarantee those factors, so one usually uses exceptions: from shutil import move try: move('somefile.txt', '/tmp/somefile.txt') except: print 'Move failed for some reason.' I'd like to actually catch the appropriate exceptions thrown instead of just catching everything, but I simply can't find a list of exceptions thrown for most python modules. Is there a way for me to see which exceptions a given function can throw, and why? This way I can make appropriate cases for each exception, eg: from shutil import move try: move('somefile.txt', '/tmp/somefile.txt') except PermissionDenied: print 'No permission.' except DestinationDoesNotExist: print "/tmp/ doesn't exist" except NoDiskSpace: print 'No diskspace available.' Answer points go to whoever can either link me to some relevant documentation that I've somehow overlooked in the official docs, or provide a sure-fire way to figure out exactly which exceptions are thrown by which functions, and why. Thanks!

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  • Why can't I handle a KeyboardInterrupt in python?

    - by Josh
    I'm writing python 2.6.6 code on windows that looks like this: try: dostuff() except KeyboardInterrupt: print "Interrupted!" except: print "Some other exception?" finally: print "cleaning up...." print "done." dostuff() is a function that loops forever, reading a line at a time from an input stream and acting on it. I want to be able to stop it and clean up when I hit ctrl-c. What's happening instead is that the code under except KeyboardInterrupt: isn't running at all. The only thing that gets printed is "cleaning up...", and then a traceback is printed that looks like this: Traceback (most recent call last): File "filename.py", line 119, in <module> print 'cleaning up...' KeyboardInterrupt So, exception handling code is NOT running, and the traceback claims that a KeyboardInterrupt occurred during the finally clause, which doesn't make sense because hitting ctrl-c is what caused that part to run in the first place! Even the generic except: clause isn't running. EDIT: Based on the comments, I replaced the contents of the try: block with sys.stdin.read(). The problem still occurs exactly as described, with the first line of the finally: block running and then printing the same traceback.

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  • Unable to install ExchangeCdo with Outlook 2010

    - by MrStatic
    We recently got the Blackberry Express Server for our small home business and linked it in with our Exchange 2010 server. All is well except for calendar syncing. From what I can tell I require the ExchangeCdo patch. Except when I go to install it, it errors saying I require Outlook 2007. I have Outlook 2010 on the server and have no real way of getting 2007 on instead. Any suggestions?

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  • OpenWRT LAN clients don't see each

    - by Valentin Galea
    I'm a beginner at using OpenWRT but I'm loving it already. Everything is running fine (internet, wifi) on all clients except one thing: the computers running in my LAN don't see each other. Pings to them or between them gives "destination host unreachable". This happens when using either the machine's IP's or their assigned hostnames. Running Backfire 10.03.1 - default settings everywhere except of course for the specific ISP stuff in the WAN. What's going on?

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  • Add Excel column without breaking equation

    - by CRAIG
    I have completed a very complex Excel spreadsheet with a lot of equations, except ... I forgot to include September I have Jan through Dec, all the months, except the calculations for September. Of course all the equations are currently perfect for the data that's here. How do I add a whole new column without ruining the previous equations? PS: tomorrow is my holidays and I have to go to work to finish this table, so bad

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  • Ping issues with Windows Server 2008 R2 with mail server!

    - by S. M.
    For some reason I can ping all servers in my network except for the mail server and the mail server can ping all servers except the windows server 2008 R2. The firewall has been disabled and still it doesn't respond. The weird part is that every once in a while it will all of a sudden start allowing pings and then just as suddenly stop allowing pings. I've made sure there's no type-o's in the ip address or subnet mask or gateway. Any other ideas?

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  • User account that is not allowed to edit one file on Ubuntu

    - by spacemonkey
    Hi, I wanted to ask if it is possible to create a user account on Ubuntu so that it had all powers and rights of root account except it would be impossible to edit a certain file. What I intend to do is to edit host file in order to block access of certain websites, and then create a user account which would be the same as root account except it would be not able to edit host file. Maybe there is an easier way to block an access of certain sites forever? Thanks!

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  • Handle Arbitrary Exception, Print Default Exception Message

    - by inspectorG4dget
    I have a program, a part of which executes a loop. During the execution of this loop, there are exceptions. Obviously, I would like my program to run without errors, but for the sake of progress, I would like the program to execute over the entire input and not stop when an exception is thrown. The easiest way to do this would be by implementing and except block. However, when I do this, it excepts all exceptions and continues with the program and I never get to see the exception message (which I need in order to debug). Is there a way to except any arbitrary exception and be able to print out the exception message in the except block?

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  • Delphi OLE - How to avoid errors like "The requested member of the collection does not exist"?

    - by Edwin
    Hi, I'm automating Word with Delphi, but some times I got an error message: The requested member of the collection does not exist It seems that the Item member of the Styles collection class does not always exist and some times causes the above mentioned error. My workaround is to catch the exception and skip it, but is there anyway to detect it instead of using the try...except block? The problem with the try...except block is that when debugging the raised exception is annoying... My code example: var aWordDoc: _WordDocument i: Integer; ovI: OleVariant; wordStyle: Style; begin for i := 1 to aWordDoc.Styles.Count do begin ovI := i; try wordStyle := aWordDoc.Styles.Item(ovI); except Continue;//skip if any error occurred. end; //do something with wordStyle end; end

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  • getting last insert id .sqlalchemy orm

    - by gummmibear
    Hi i use sqlalchemy, i need some help. import hashlib import sqlalchemy as sa from sqlalchemy import orm from allsun.model import meta t_user = sa.Table("users",meta.metadata,autoload=True) class Duplicat(Exception): pass class LoginExistsException(Exception): pass class EmailExistsException(Exception): pass class User(object): """ def __setattr__(self, key, value): if key=='password' : value=unicode(hashlib.sha512(value).hexdigset()) object.__setattr__(self,key,value) """ def loginExists(self): try: meta.Session.query(User).filter(User.login==self.login).one() except orm.exc.NoResultFound: pass else: raise LoginExistsException() def emailExists(self): try: meta.Session.query(User).filter(User.email==self.email).one() except orm.exc.NoResultFound: pass else: raise EmailExistsException() def save(self): meta.Session.begin() meta.Session.save(self) try: meta.Session.commit() except sa.exc.IntegrityError: raise Duplicat() How can i get inserted id when i call? user = User() user.login = request.params['login'] user.password = hashlib.sha512(request.params['password']).hexdigest() user.email = request.params['email'] user.save()

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  • Converting IPv4 or IPv6 address to a long for comparisons

    - by Justin Akehurst
    In order to check if an IPv4 or IPv6 address is within a certain range, I've got code that takes an IPv4 address, turns that into a long, then does that same conversion on the upper/lower bound of the subnet, then checks to see if the long is between those values. I'd like to be able to do the same thing for IPv6, but saw nothing in the Python 2.6 standard libraries to allow me to do this, so I wrote this up: import socket, struct from array import array def ip_address_to_long(address): ip_as_long = None try: ip_as_long = socket.ntohl(struct.unpack('L', socket.inet_pton(socket.AF_INET, address))[0]) except socket.error: # try IPv6 try: addr = array('L', struct.unpack('!4L', socket.inet_pton(socket.AF_INET6, address))) addr.reverse() ip_as_long = sum(addr[i] << (i * 32) for i in range(len(addr))) except socket.error as se: raise ValueError('Invalid address') except Exception as e: print str(e) return ip_as_long My question is: Is there a simpler way to do this that I am missing? Is there a standard library call that can do this for me?

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  • syntax error in python:

    - by pecker
    Hello, I'm learning python. It gives syntax error in this script. I'm unable to figure out. import exceptions class FOUND(Exception): pass x = [1,2,3,4,56,73,29,35,12,32,63,12,76,75,89] while True: test = int(raw_input('Enter integer to be checked in list:')) try: count = -1 for y in x: count += 1 if y == test: raise FOUND except ValueError,e: print "Not a valid integer (%d)"%(e) except FOUND: print "Found (%d) at (%d)"%(test,count) else: print "Not found ,Appending (%d) to list at location (%d)"%(test,count+1) x.append(test) finally: print "The List:" print x print " " Invalid syntax & it highlights comma in this line: 'except ValueError,e:'

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  • Testing with Unittest Python

    - by chrissygormley
    Hello, I am runninig test's with Python Unittest. I am running tests but I want to do negative testing and I would like to test if a function throw's an exception, it passes but if no exception is thrown the test fail's. The script I have is: try: result = self.client.service.GetStreamUri(self.stream, self.token) self.assertFalse except suds.WebFault, e: self.assertTrue else: self.assertTrue This alway's passes as True even when the function work's perfectly. I have also tried various other way's including: try: result = self.client.service.GetStreamUri(self.stream, self.token) self.assertFalse except suds.WebFault, e: self.assertTrue except Exception, e: self.assertTrue Does anyone have any suggestions? Thanks

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  • How to remove the “AMD Testing use only” watermark from Ubuntu 12.10

    - by Lucio
    I've installed the latest catalyst driver (beta) following the step in this guide for Ubuntu Quantal Quetzal. My system is 64 bit and my graphic card is an ATI RadeonHD 6670, this g.c. is Officially Supported (Catalyst & Open Source), you can confirm that from this AMD Linux Community thread. I don't have any problem, except the AMD testing use only watermark. I see the following frame in any stage into the OS (logged, unlloged, etc.) except in the terminals. I found different versions of how to remove this image, but this change according to the system, so I want an answer from this popular (trusted) site. How to solve this issue in Ubuntu 12.10 32b? This procedure is different in a 64b system?

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  • Compiling a Monogame Game into a single .exe

    - by user27483
    Is it possible to compile a monogame game into a single .exe? I know if you go in the debug or release bin, there is in fact a .exe your game, except you move this .exe's file location or try to run in on another computer it crashes. I am also aware of the one-click application except this seems like a really messy way of redistributing a monogame game. How come when you build your game, the exe for it wont work anywhere but that file location and that computer. I am also aware that the computer probably needs the XNA framework downloaded to play the monogame game, so in short is it possible to redistribute a monogame game by creating a single .exe and assume that person who is using it doesnt have XNA or monogame installed?

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  • Simplified knapsack in PHP

    - by Mikhail
    I have two instances where I'd like to display information in a "justified" alignment - but I don't care if the values are switched in order. One example being displaying the usernames of people online: Anton Brother68 Commissar Dougheater Elflord Foobar Goop Hoo Iee Joo Rearranging them we could get exactly 22 characters long on each line: Anton Brother68 Foobar Commissar Elflord Goop Dougheater Hoo Iee Joo This is kind of a knapsack, except seems like there ought to be a P solution since I don't care about perfection, and I have multiple lines. Second instance is identical, except instead of names and character count I would be displaying random images and use their width.

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  • Change resolution in Waking Mars

    - by Wes
    I purchased and installed the humble bundle game "Waking Mars" via the Ubuntu Software Center and it works really well except for some issues with changing settings, namely with the resolution. The in-game settings for changing resolution and entering/exiting fullscreen were easy enough to find and toggle, and when you do it asks to restart the application. When you restart it, all other settings you updated are reflected except for the changes to the resolution. (I'm trying to get it to play in windowed mode that fits onto one monitor, but it will only default to windowed mode with the full dual monitor resolution). I noticed that it writes these values to ~/.local/share/WakingMars/UserSettings.ini. When I change the resolution, it is properly written to in this settings file...but it never is reflected when you restart the application. Any ideas what's wrong?

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  • Switching from abstract class to interface

    - by nischayn22
    I have an abstract class which has all abstract methods except one which constructs objects of the subclasses. Now my mentor asked me to move this abstract class to an interface. Having an interface is no problem except with the method used to construct subclass objects. Where should this method go now? Also, I read somewhere that interfaces are more efficient than abstract classes. Is this true? Here's an example of my classes abstract class Animal { //many abstract methods getAnimalobject(some parameter) { return //appropriate subclass } } class Dog extends Animal {} class Elephant extends Animal {}

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