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  • How to preserve data integrity while minimizing the transmission size

    - by user1500578
    we have sensors in the wild that send their data to a server every day via TCP/IP, either through 3G or through satellite for the physical layer. The sensors can automatically switch from one to the other depending on their location and the quality of the signal with the local 3G operator. Given that the 3G and satellite communications are very expensive, we want to minimize the amount of data to send. But also, we want to protect ourselves from lost data. What would be the best strategy to ensure with reasonable certainty that the integrity of our data is preserved, while minimizing the amount of redundancy, i.e the amount of data transmitted ? I've read about the zfec codec, but I'm not sure if we need to transmit all the chunks, or if we need to send a hash code along each chunk.

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  • Constant Expected "{" before ")" token

    - by Thijs
    I've got a little problem. I am applying some changes to an iOS program i wrote, but I've struck a problem. I constantly get a "Expected '{' before ')' token" warning, but my coding skills aren't good enough to find the problem. A little help would greatly be appreciated. #import "Search.h" #import "RootViewController.h" //button - (IBAction)buttonPressed)sender{ RootViewController *newview = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil]; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.5]; [UIView setAnimationTransition:UIViewAnimationTransitionFl ipFromRight forView:self.view cache:YES]; [self.view addSubview:newview.view]; [UIView commitAnimations]; @implementation Search @end

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  • ASP.Net Form Databound problems

    - by Jason Bitman
    I know there is a similar problem on this forum, but the solutions did not really work for me. I am populating form controls with fields from a few different data sources, and the data shows up great. I have an ImageButton controlwhich has an OnClick Event set to grab all of the data from the form. Unfortunately, when I click the button, it seems as though the page is reloading first, and THEN is executes the OnClick call. The data that was hand-entered, or hard-coded seems to be pulled fine from the controls it was entered in, but anything that was pulled from a datasource is not able to be read. Any ideas. this is the last hurdle in a project that I have been working on for 6 months. I want to go home... Thank you so much in advance. Jason

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  • This web site needs a different Google Maps API key. A new key can be generated at http://code.googl

    - by MJI
    I'm not a developer. I have no domain, nor wish to have one at the time. Rather I'm just a regular person who likes to upload photos to some photo related sites. My uploading process constantly gets interrupted by one of these annoying API errors. I get it at least two times, one when I click the page to upload, and also right after it has uploaded. It also pops up if I go to edit a photo or delete it. This interrupts my browsing experience until I click okay. I just want a fix for the annoying without having to register for a key. I tried before and it required a web domain. I rather not have to create a domain and go through such hoops just to fix this. Is there a solution for this problem that doesn't require registration? Another thing to note: I have used two computers. One has the message pop-up and the other doesn't. What is different about the two computers?

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  • Server -> Desktop Push API

    - by Rich Anderson
    Hi I am looking for solution which can push automatically a certain event (let's say RSS message) realtime to a desktop user. A toolbar app or a desktop (growl like) will be super for this push. I have looked at few options but cannot find much info on these kind of apps. I have looked at conduit - it sucks as there is lot of other fancy options which I am not interested in offering to users. Please let me know. Thanks.

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  • Weird output of Throwable getMessage()

    - by Ravi Gupta
    Hi I have below pseudo code with throws an exception like this throw new MyException("Bad thing happened","com.stuff.errorCode"); where MyException extends Exception class. So the problem is when I try to get the message from MyException class by calling myEx.getMessage() it returns ???en_US.Bad thing happened??? instead of my original message i.e. Bad thing happened I have checked that MyException class doesn't overrides Throwable class's getMessage() behavior. Below is the how the call passes from MyException.getMessage() to Throwable.getMessage() public MyException(String msg, String sErrorCode){ super(msg); this.sErrorCode = sErrorCode; this.iSeverity = 0; } which then calls public Exception(String message) { super(message); } and finally public Throwable(String message) { fillInStackTrace(); detailMessage = message; } when I do a getMessage on myexception it calls Throwable's getMessage as below public String getMessage() { return detailMessage; } So ideally it should return the original message as I set when throwing the exception. What's the ???en_US thing ?

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  • PHP echo text if variable is blank

    - by user342391
    I am trying to echo €00.00 if my variable $amount equals zero I have done something wrong can you help?? Code while ($row9 = mysql_fetch_array($result9)) { $amount = $row9['amount']; } //$amount = $amount / 60; //$amount = round($amount, 2); if $amount == 0 echo "<b>Balance: &#8364;00.00</b>"; else echo "<b>Balance: $$amount</b>";

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  • PHP 5.4: disable warning "Creating default object from empty value"

    - by Werner
    I want to migrate code from PHP 5.2 to 5.4. This worked fine so far except that all the code I use makes extensive use of just using an object with a member without any initialisation, like: $MyObject->MyMember = "Hello"; which results in the warning: "Creating default object from empty value" I know that the solution would be to use: $MyObject = new stdClass(); $MyObject->MyMember = "Hello"; but it would be A LOT OF WORK to change this in all my code, because I use this many times in different projects. I know, it's not good style, but unfortunately I'm not able to spend the next weeks adding this to all of my code. I know I could set the php error_reporting to not reporting warnings, but I want to be able to still get other warnings and notices. This warning doesn't seem to be effected by enable or disable E_STRICT at all. So is there a way to just disable this warning?!

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  • How to roll back changes in gridview in case of incorrect input

    - by Mustafa A. Jabbar
    Hi, I have a DataGridView that is bound to a list of object. It has some columns that the user can edit. There are certain inputs that are not allowed for a row as a whole. How can I roll back if the user enters invalid inputs in some cell. I tried using the RowValidating event handler but it was not called after cell value has been changed. Even when I implemet CellValueChanged, I still cannot roll back the changes. Any idea how to accomplish this

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  • errors when trying to delete a key in the registry

    - by NightsEVil
    i'm trying to delete a registry from the Local_Machine\Software in the registry i made a key titles "DeleteMe" as a test to try it out but i cant get it to work iv tried multiple options and they all say that the "subkey" "subkeytree" and "value" do not exist BUT IT DOES! and i hope i'm using the right terminology here to its HKEY_LOCAL_MACHINE\SOFTWARE\DeleteMe i want it and all the sub keys/values deleted.. (i hope key is the right terminology they look just like folders but when right clicked on they have the option "copy key name")

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  • PHP fsockopen doesnt return anything

    - by Industrial
    Hi! I am modifying a PHP db wrapper for the redis database. Here's how my function looks: public function connect() { $sock = @fsockopen('localhost', '6379', $errno, $errstr, 2); if ($sock === FALSE) { return FALSE; } else { stream_set_timeout($sock, 2); return $sock; } } What I want to do is to call this function from another part in my wrapper: if ($this->connect() !== FALSE) { // Do stuff } How can I get my connect function to send a FALSE when the fsockopen isn't working? Thanks!

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  • Warning: expects resource but string given

    - by Damien
    I get: "Resource id #8 Warning: mysql_fetch_array() expects parameter 1 to be resource, string given" Heres the code: $sql="SELECT password FROM user WHERE userid=$userid"; echo $password=mysql_query($sql); while($row = mysql_fetch_array($password)) { $password = $row['password']; } Any ideas?

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  • UIWebView doesn't load some link

    - by elos
    hello I'm trying to write an rss feed viewer for my iPhone. In my DetailView I have a UIWebView where I want to display specific link retrieved with the rss item.: NSString* url = [data objectForKey:@"link"]; NSString *encodedUrl = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding ]; NSLog(@"Selected link:%@",url); NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:encodedUrl]]; [itemWebpage loadRequest:request]; [request release]; now,if the retrieved link is something like www.shazaam.com it works. But as soon as the link is something like: http://www.shazam.com/music/web/track?id=41970148" it doesn't. I suppose it's because of the parameter...but how can I fix the problem???? thanks a lot! elos

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  • When is it appropriate to use C++ exceptions?

    - by krebstar
    I'm trying to design a class that needs to dynamically allocate some memory.. I had planned to allocate the memory it needs during construction, but how do I handle failed memory allocations? Should I throw an exception? I read somewhere that exceptions should only be used for "exceptional" cases, and running out of memory doesn't seem like an exceptional case to me.. Should I allocate memory in a separate initialization routine instead and check for failures and then destroy the class instance gracefully? Or should I use exceptions instead? The class won't have anything useful to do if these memory allocations should fail.. EDIT: The consensus seems to be that running out of memory IS an exceptional case. Will see how to go about this.. Thanks.. :)

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  • Problem With Inserts of multibyte (converted to utf-8) strings in the mysql tables of utf_unicode_ci encoding

    - by user381595
    http://domainsoutlook.com/sandbox/keyword/?s=http://bhaskar.com raw example of my keyword density analyser. Every keyword shows up properly with no problems in unicode conversions etc. Now, When I am adding these words to the database column of a table, the words show up as messed up. http domainsoutlook.com/b/site/bhaskar.com.html For example on this front end page if you see there is a keyword that is shown as a blank but still occurs on the website 8 times. (It isnt empty in the database though). I have checked and there is no problem with mysql_real_escape_String...because the output stays the same before and after the word is gone through mysql_real_escape_String. Another problem was that I wanted to fix my urls for arabic language. They should be showing up as /word-{1st letter of the word}/{whole word}.html but its showing as /word-{whole word}/{1st letter of the word}.html I really need answers for these two questions.

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  • Output from OouraFFT correct sometimes but completely false other times. Why ?

    - by Yan
    Hi I am using Ooura FFT to compute the FFT of the accelerometer data in windows of 1024 samples. The code works fine, but then for some reason it produces very strange outputs, i.e. continuous spectrum with amplitudes of the order of 10^200. Here is the code: OouraFFT *myFFT=[[OouraFFT alloc] initForSignalsOfLength:1024 NumWindows:10]; // had to allocate it UIAcceleration *tempAccel = nil; double *input=(double *)malloc(1024 * sizeof(double)); double *frequency=(double *)malloc(1024*sizeof(double)); if (input) { //NSLog(@"%d",[array count]); for (int u=0; u<[array count]; u++) { tempAccel = (UIAcceleration *)[array objectAtIndex:u]; input[u]=tempAccel.z; //NSLog(@"%g",input[u]); } } myFFT.inputData=input; // specifies input data to myFFT [myFFT calculateWelchPeriodogramWithNewSignalSegment]; // calculates FFT for (int i=0;i<myFFT.dataLength;i++) // loop to copy output of myFFT, length of spectrumData is half of input data, so copy twice { if (i<myFFT.numFrequencies) { frequency[i]=myFFT.spectrumData[i]; // } else { frequency[i]=myFFT.spectrumData[myFFT.dataLength-i]; // copy twice } } for (int i=0;i<[array count];i++) { TransformedAcceleration *NewAcceleration=[[TransformedAcceleration alloc]init]; tempAccel=(UIAcceleration*)[array objectAtIndex:i]; NewAcceleration.timestamp=tempAccel.timestamp; NewAcceleration.x=tempAccel.x; NewAcceleration.y=tempAccel.z; NewAcceleration.z=frequency[i]; [newcurrentarray addObject:NewAcceleration]; // this does not work //[self replaceAcceleration:NewAcceleration]; //[NewAcceleration release]; [NewAcceleration release]; } TransformedAcceleration *a=nil;//[[TransformedAcceleration alloc]init]; // object containing fft of x,y,z accelerations for(int i=0; i<[newcurrentarray count]; i++) { a=(TransformedAcceleration *)[newcurrentarray objectAtIndex:i]; //NSLog(@"%d,%@",i,[a printAcceleration]); fprintf(fp,[[a printAcceleration] UTF8String]); //this is going wrong somewhow } fclose(fp); [array release]; [myFFT release]; //[array removeAllObjects]; [newcurrentarray release]; free(input); free(frequency);

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  • Android onActivityResult is always 0

    - by Dean
    This has been killing me for two days now. I have a main Activity A which calls a second Activity B. Activity B simply presents the user with a listview. When I press an item on the list view I want a couple of strings to be passed back to the main Activity A and Activiy B will finish. The problem is I always get a resultcode of 0 and the data bundle is null. I really don't understand why this is happening. Here is my code. Start Activity B for result; Test.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(recipeActivity.this, BrowseLoadRecipes.class); startActivityForResult(i, RECIPE_CHOOSER); } }); This starts the second Activity fine. Activity B populates a listview and when I click an item I'm trying to send some data back to the calling Activity A. Any text at the moment, so I used the following in Activity B; lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> a, View v, int position, long id) { Bundle bundle = new Bundle(); bundle.putString("TEXT", "Please work... pleeeeaasee"); Intent mIntent = new Intent(); mIntent.putExtras(bundle); setResult(RESULT_OK, mIntent); finish(); } }); In the calling activity I have the following listening for the return as follows; protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch(requestCode) { //TODO case RECIPE_CHOOSER: Toast.makeText(getApplicationContext(), "In recipe return", Toast.LENGTH_SHORT).show(); Toast.makeText(getApplicationContext(), "resultCode is " + String.valueOf(resultCode), Toast.LENGTH_SHORT).show(); if (resultCode == RESULT_OK) { Bundle b = getIntent().getExtras(); Toast.makeText(getApplicationContext(), "Returned " + b.getString("TEXT"), Toast.LENGTH_LONG).show(); } if (resultCode == RESULT_CANCELED) { } break; } } } I can see that the request code is correctly returned, but the resultcode is always a 0 and the data is always a null. I've ran through the debug and the setResult is doing its job and the bundle does indeed have the data I'm passing, but it's lost at some point along the way. Is there something in the manifest I'm missing or something. It's killed my progress on this project so far. Any help would truly be appreciated. Thanks, Dean

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