member function pointers - Page 28

PostgreSQL function to iterate through/act on many rows with state

- by Claudiu

I have a database with columns looking like: session | order | atype | amt --------+-------+-------+----- 1 | 0 | ADD | 10 1 | 1 | ADD | 20 1 | 2 | SET | 35 1 | 3 | ADD | 10 2 | 0 | SET | 30 2 | 1 | ADD | 20 2 | 2 | SET | 55 It represents actions happening. Each session starts at 0. ADD adds an amount, while SET sets it. I want a function to return the end value of a session, e.g. SELECT session_val(1); --returns 45 SELECT session_val(2); --returns 55 Is it possible to write such a function/query? I don't know how to do any iteration-like things with SQL, or if it's possible at all.

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php - i wanna function to remove number higher that 5000 in string

- by cash

i have string that contain unwanted numbers ( any number higher than 5000 ) i wanna php function to remove any number higher than 5000 only thnx :)

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Adding a method to a function object at runtime

- by Carson Myers

I read a question earlier asking if there was a times method in Python, that would allow a function to be called n times in a row. Everyone suggested for _ in range(n): foo() but I wanted to try and code a different solution using a function decorator. Here's what I have: def times(self, n, *args, **kwargs): for _ in range(n): self.__call__(*args, **kwargs) import new def repeatable(func): func.times = new.instancemethod(times, func, func.__class__) @repeatable def threeArgs(one, two, three): print one, two, three threeArgs.times(7, "one", two="rawr", three="foo") When I run the program, I get the following exception: Traceback (most recent call last): File "", line 244, in run_nodebug File "C:\py\repeatable.py", line 24, in threeArgs.times(7, "one", two="rawr", three="foo") AttributeError: 'NoneType' object has no attribute 'times' So I suppose the decorator didn't work? How can I fix this?

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get the list and input from one function and run them in different function

- by rookie

i have a programm that generate the list and then i ask them to tell me what they want to do from the menu and this is where my problem start i was able to get the input form the user to different function but when i try to use the if else condition it doesn't check, below are my code def menu(x,l): print (x) if x == 1: return make_table(l) if x == 2: y= input("enter a row (as a number) or a column (as an uppercase letter") if y in [ "1",'2','3']: print("Minmum is:",minimum(y,l)) if x== 3: print ('bye') def main(): bad_filename = True l =[] while bad_filename == True: try: filename = input("Enter the filename: ") fp = open(filename, "r") for f_line in fp: f_str=f_line.strip() f_str=f_str.split(',') for unit_str in f_str: unit=float(unit_str) l.append(unit) bad_filename = False except IOError: print("Error: The file was not found: ", filename) #print(l) condition=True while condition==True: print('1- open\n','2- maximum') x=input("Enter the choice") menu(x,l) main() from the bottom function i can get list and i can get the user input and i can get the data and move it in second function but it wont work after that.thank you

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How to use unnamed function arguments in C or C++

- by zed91

How do I use function arguments declared like void f(double) { /**/ } if it is possible?

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Get result type of function

- by Robert

I want to specialize a template function declared as: template<typename Type> Type read(std::istream& is); I then have a lot of static implementations static int read_integer(std::istream& is); a.s.o. Now I'd like to do a macro so that specialization of read is as simple as: SPECIALIZE_READ(read_integer) So I figured I'd go the boost::function_traits way and declare SPECIALIZE_READ as: #define SPECIALIZE_READ(read_function) \ template<> boost::function_traits<read_function>::result_type read(std::istream& is) { \ return read_function(is); \ } but VC++ (2008) compiler complains with: 'boost::function_traits' : 'read_integer' is not a valid template type argument for parameter 'Function' Ideas ?

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Object is not a function on call to dialog() function

- by coffeeaddict

I keep getting "dialogDiv.dialog is not a function". I'm simply trying to invoke the jQueryUI dialog off my reference to the div. So incoming is the divID, for example "myDiv". Then I set it to a variable and wrap it in $("#" + myDiv); so that now I have a reference to it in a nice clear variable. Then I try to invoke the dialog function and get that error. not sure why and it's driving me nuts. function showDialog(divID) { // Get reference to the div element var dialogDiv = $("#" + divID); alert("dialogDiv:" + dialogDiv); dialogDiv.dialog ( { bgiframe: true, modal: true, autoOpen: false, show: 'blind' } ) dialogDiv.dialog("open"); }

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Game Over function is not working Starling

- by aNgeLyN omar

I've been following a tutorial over the web but it somehow did not show something about creating a game over function. I am new to the Starling framework and Actionscript so I'm kind of still trying to find a way to make it work. Here's the complete snippet of the code. package screens { import flash.geom.Rectangle; import flash.utils.getTimer; import events.NavigationEvent; import objects.GameBackground; import objects.Hero; import objects.Item; import objects.Obstacle; import starling.display.Button; import starling.display.Image; import starling.display.Sprite; import starling.events.Event; import starling.events.Touch; import starling.events.TouchEvent; import starling.text.TextField; import starling.utils.deg2rad; public class InGame extends Sprite { private var screenInGame:InGame; private var screenWelcome:Welcome; private var startButton:Button; private var playAgain:Button; private var bg:GameBackground; private var hero:Hero; private var timePrevious:Number; private var timeCurrent:Number; private var elapsed:Number; private var gameState:String; private var playerSpeed:Number = 0; private var hitObstacle:Number = 0; private const MIN_SPEED:Number = 650; private var scoreDistance:int; private var obstacleGapCount:int; private var gameArea:Rectangle; private var touch:Touch; private var touchX:Number; private var touchY:Number; private var obstaclesToAnimate:Vector.<Obstacle>; private var itemsToAnimate:Vector.<Item>; private var scoreText:TextField; private var remainingLives:TextField; private var gameOverText:TextField; private var iconSmall:Image; static private var lives:Number = 2; public function InGame() { super(); this.addEventListener(starling.events.Event.ADDED_TO_STAGE, onAddedToStage); } private function onAddedToStage(event:Event):void { this.removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage); drawGame(); scoreText = new TextField(300, 100, "Score: 0", "MyFontName", 35, 0xD9D919, true); remainingLives = new TextField(600, 100, "Lives: " + lives +" X ", "MyFontName", 35, 0xD9D919, true); iconSmall = new Image(Assets.getAtlas().getTexture("darnahead1")); iconSmall.x = 360; iconSmall.y = 40; this.addChild(iconSmall); this.addChild(scoreText); this.addChild(remainingLives); } private function drawGame():void { bg = new GameBackground(); this.addChild(bg); hero = new Hero(); hero.x = stage.stageHeight / 2; hero.y = stage.stageWidth / 2; this.addChild(hero); startButton = new Button(Assets.getAtlas().getTexture("startButton")); startButton.x = stage.stageWidth * 0.5 - startButton.width * 0.5; startButton.y = stage.stageHeight * 0.5 - startButton.height * 0.5; this.addChild(startButton); gameArea = new Rectangle(0, 100, stage.stageWidth, stage.stageHeight - 250); } public function disposeTemporarily():void { this.visible = false; } public function initialize():void { this.visible = true; this.addEventListener(Event.ENTER_FRAME, checkElapsed); hero.x = -stage.stageWidth; hero.y = stage.stageHeight * 0.5; gameState ="idle"; playerSpeed = 0; hitObstacle = 0; bg.speed = 0; scoreDistance = 0; obstacleGapCount = 0; obstaclesToAnimate = new Vector.<Obstacle>(); itemsToAnimate = new Vector.<Item>(); startButton.addEventListener(Event.TRIGGERED, onStartButtonClick); //var mainStage:InGame =InGame.current.nativeStage; //mainStage.dispatchEvent(new Event(Event.COMPLETE)); //playAgain.addEventListener(Event.TRIGGERED, onRetry); } private function onStartButtonClick(event:Event):void { startButton.visible = false; startButton.removeEventListener(Event.TRIGGERED, onStartButtonClick); launchHero(); } private function launchHero():void { this.addEventListener(TouchEvent.TOUCH, onTouch); this.addEventListener(Event.ENTER_FRAME, onGameTick); } private function onTouch(event:TouchEvent):void { touch = event.getTouch(stage); touchX = touch.globalX; touchY = touch.globalY; } private function onGameTick(event:Event):void { switch(gameState) { case "idle": if(hero.x < stage.stageWidth * 0.5 * 0.5) { hero.x += ((stage.stageWidth * 0.5 * 0.5 + 10) - hero.x) * 0.05; hero.y = stage.stageHeight * 0.5; playerSpeed += (MIN_SPEED - playerSpeed) * 0.05; bg.speed = playerSpeed * elapsed; } else { gameState = "flying"; } break; case "flying": if(hitObstacle <= 0) { hero.y -= (hero.y - touchY) * 0.1; if(-(hero.y - touchY) < 150 && -(hero.y - touchY) > -150) { hero.rotation = deg2rad(-(hero.y - touchY) * 0.2); } if(hero.y > gameArea.bottom - hero.height * 0.5) { hero.y = gameArea.bottom - hero.height * 0.5; hero.rotation = deg2rad(0); } if(hero.y < gameArea.top + hero.height * 0.5) { hero.y = gameArea.top + hero.height * 0.5; hero.rotation = deg2rad(0); } } else { hitObstacle-- cameraShake(); } playerSpeed -= (playerSpeed - MIN_SPEED) * 0.01; bg.speed = playerSpeed * elapsed; scoreDistance += (playerSpeed * elapsed) * 0.1; scoreText.text = "Score: " + scoreDistance; initObstacle(); animateObstacles(); createEggItems(); animateItems(); remainingLives.text = "Lives: "+lives + " X "; if(lives == 0) { gameState = "over"; } break; case "over": gameOver(); break; } } private function gameOver():void { gameOverText = new TextField(800, 400, "Hero WAS KILLED!!!", "MyFontName", 50, 0xD9D919, true); scoreText = new TextField(800, 600, "Score: "+scoreDistance, "MyFontName", 30, 0xFFFFFF, true); this.addChild(scoreText); this.addChild(gameOverText); playAgain = new Button(Assets.getAtlas().getTexture("button_tryAgain")); playAgain.x = stage.stageWidth * 0.5 - startButton.width * 0.5; playAgain.y = stage.stageHeight * 0.75 - startButton.height * 0.75; this.addChild(playAgain); playAgain.addEventListener(Event.TRIGGERED, onRetry); } private function onRetry(event:Event):void { playAgain.visible = false; gameOverText.visible = false; scoreText.visible = false; var btnClicked:Button = event.target as Button; if((btnClicked as Button) == playAgain) { this.dispatchEvent(new NavigationEvent(NavigationEvent.CHANGE_SCREEN, {id: "playnow"}, true)); } disposeTemporarily(); } private function animateItems():void { var itemToTrack:Item; for(var i:uint = 0; i < itemsToAnimate.length; i++) { itemToTrack = itemsToAnimate[i]; itemToTrack.x -= playerSpeed * elapsed; if(itemToTrack.bounds.intersects(hero.bounds)) { itemsToAnimate.splice(i, 1); this.removeChild(itemToTrack); } if(itemToTrack.x < -50) { itemsToAnimate.splice(i, 1); this.removeChild(itemToTrack); } } } private function createEggItems():void { if(Math.random() > 0.95){ var itemToTrack:Item = new Item(Math.ceil(Math.random() * 10)); itemToTrack.x = stage.stageWidth + 50; itemToTrack.y = int(Math.random() * (gameArea.bottom - gameArea.top)) + gameArea.top; this.addChild(itemToTrack); itemsToAnimate.push(itemToTrack); } } private function cameraShake():void { if(hitObstacle > 0) { this.x = Math.random() * hitObstacle; this.y = Math.random() * hitObstacle; } else if(x != 0) { this.x = 0; this.y = 0; lives--; } } private function initObstacle():void { if(obstacleGapCount < 1200) { obstacleGapCount += playerSpeed * elapsed; } else if(obstacleGapCount !=0) { obstacleGapCount = 0; createObstacle(Math.ceil(Math.random() * 5), Math.random() * 1000 + 1000); } } private function animateObstacles():void { var obstacleToTrack:Obstacle; for(var i:uint = 0; i<obstaclesToAnimate.length; i++) { obstacleToTrack = obstaclesToAnimate[i]; if(obstacleToTrack.alreadyHit == false && obstacleToTrack.bounds.intersects(hero.bounds)) { obstacleToTrack.alreadyHit = true; obstacleToTrack.rotation = deg2rad(70); hitObstacle = 30; playerSpeed *= 0.5; } if(obstacleToTrack.distance > 0) { obstacleToTrack.distance -= playerSpeed * elapsed; } else { if(obstacleToTrack.watchOut) { obstacleToTrack.watchOut = false; } obstacleToTrack.x -= (playerSpeed + obstacleToTrack.speed) * elapsed; } if(obstacleToTrack.x < -obstacleToTrack.width || gameState == "over") { obstaclesToAnimate.splice(i, 1); this.removeChild(obstacleToTrack); } } } private function checkElapsed(event:Event):void { timePrevious = timeCurrent; timeCurrent = getTimer(); elapsed = (timeCurrent - timePrevious) * 0.001; } private function createObstacle(type:Number, distance:Number):void{ var obstacle:Obstacle = new Obstacle(type, distance, true, 300); obstacle.x = stage.stageWidth; this.addChild(obstacle); if(type >= 4) { if(Math.random() > 0.5) { obstacle.y = gameArea.top; obstacle.position = "top" } else { obstacle.y = gameArea.bottom - obstacle.height; obstacle.position = "bottom"; } } else { obstacle.y = int(Math.random() * (gameArea.bottom - obstacle.height - gameArea.top)) + gameArea.top; obstacle.position = "middle"; } obstaclesToAnimate.push(obstacle); } } }

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Why friend function is preferred to member function for operator<<

- by skydoor

When you are going to print an object, a friend operator<< is used. Can we use member function for operator<< ? class A { public: void operator<<(ostream& i) { i<<"Member function";} friend ostream& operator<<(ostream& i, A& a) { i<<"operator<<"; return i;} }; int main () { A a; A b; A c; cout<<a<<b<<c<<endl; a<<cout; return 0; } One point is that friend function enable us to use it like this cout<<a<<b<<c What other reasons?

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C++ difference between "char " and "char = new char[]"

- by nashmaniac

So, if I want to declare an array of characters I can go this way char a[2]; char * a ; char * a = new char[2]; Ignoring the first declaration, the other two use pointers. As far as I know the third declaration is stored in heap and is freed using the delete operator . does the second declaration also hold the array in heap ? Does it mean that if something is stored in heap and not freed can be used anywhere in a file like a variable with file linkage ? I tried both third and second declaration in one function and then using the variable in another but it didn't work, why ? Are there any other differences between the second and third declarations ?

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Should *'s go next to the type or the variable name? [closed]

- by derekerdmann

Possible Duplicate: int* i; or int *i; or int * i; When working in C or C++, how should pointers be declared? Like this: char* derp; or this: char *derp; I typically use the first method, because the variable is a character pointer, but I know that it can create confusion when declaring multiple variables at once: char* herp, derp; herp becomes a character pointer, while derp is just a character. I know it often comes down to coding style, but which one is "better?" Should I sacrifice clarity to eliminate potential confusion?

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Lvalue required error [migrated]

- by ankur.trapasiya

While working with pointers i wrote the following code, int main() { int a[]={10,20,30,40,50}; int i; for(i=0;i<5;i++) { printf("\n%d",*a); a++; } return 0; } Now as per my understanding array name itself is an address in c and the pointer arithmetic done is here is correct as per my knowledge. But when i try to run the code it is giving me "Lvalue Required" error. So what is the exact reason for occuring Lvalue required error because before this also i have come across situations where this error is there. Secondly why the arithmetic on the pointer is not legal here in this case?

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calling a function from static function

- by iSight

Hi, how can i call a function which computes with input parameters from an another static function. say, class X { static void xyz(); static int pqr(int, int); }; static X::void xyz() { ...pqr(10,20); } int X::pqr(int t1, int t2) { return t1*t2; }

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Error Message 'class::function' : illegal call of non-static member function

- by shak

i was trying to call a static function of class using scope resolution operator, the way to access static function but still generating error. what are the possibilities.

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In javascript, execute a function when the first function is ready

- by Cinaird

Is there any way, in javascript, to call on a other function when the first function is "ready" something like this: ridiculousTimeConsumingFunction().onReady( newFunction() ); To illustrate my example you can take a look her: http://web.cinaird.se/pdf/test.htm

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Add if else function in Ajax Jquery function

- by Naga Botak

Is it possible to add other else function in my JS like this: ? if response == success redirect to home if response == failed redirect to failed $.ajax({ type: "POST", url: action, data: form_data, success: function(response) { if(response == 'success') window.location.replace("home"); else $("#message").html("<div class='error_log'><p class='error'>Invalid username and/or password.</p></div>"); } });

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quick [php function] -> [javascript function] question

- by Haroldo

if anyone fancies doing me a really quick favour, it would be really appreciated: static function make_url_safe($z){ $z = strtolower($z); $z = preg_replace('/[^a-zA-Z0-9\s] /i', '', $z); $z = str_ireplace(' ', '-', $z); return $z; } what js functions should i be looking at to convert this function to javascript?

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function not working R

- by user3722828

I've never programmed before and am trying to learn. I'm following that "coursera" course that I've seen other people post about — a course offered by Johns Hopkins on R programming. Anyway, this was supposed to be my first function. Yet, it doesn't work! But when I type out all the steps individually, it runs just fine... Can anyone tell me why? > pollutantmean <- function(directory, pollutant, id = 1:332){ + x<- list.files("/Users/mike******/Desktop/directory", full.names=TRUE) + y<- lapply(x, read.csv) + z<- do.call(rbind.data.frame, y[id]) + + mean(z$pollutant, na.rm=TRUE) + } > pollutantmean(specdata,nitrate,1:10) [1] NA Warning message: In mean.default(z$pollutant, na.rm = TRUE) : argument is not numeric or logical: returning NA #### > x<- list.files("/Users/mike******/Desktop/specdata",full.names=TRUE) > y<- lapply(x,read.csv) > z<- do.call(rbind.data.frame,y[1:10]) > mean(z$nitrate,na.rm=TRUE) [1] 0.7976266

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Does this mimic perfectly a function template specialization?

- by zeroes00

Since the function template in the following code is a member of a class template, it can't be specialized without specializing the enclosing class. But if the compiler's full optimizations are on (assume Visual Studio 2010), will the if-else-statement in the following code get optimized out? And if it does, wouldn't it mean that for all practical purposes this IS a function template specialization without any performance cost? template<typename T> struct Holder { T data; template<int Number> void saveReciprocalOf(); }; template<typename T> template<int Number> void Holder<T>::saveReciprocalOf() { //Will this if-else-statement get completely optimized out if(Number == 0) data = (T)0; else data = (T)1 / Number; } //----------------------------------- void main() { Holder<float> holder; holder.saveReciprocalOf<2>(); cout << holder.data << endl; }

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Problem with function calls [javascript]

- by Samuel

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Undeclared - 'first use in function'

- by Ragunath Jawahar

I'm new to Objective-C, though I have a very good hand in Android. I'm trying to make a call to a method but it gives me 'first use in function'. I know I'm making a silly mistake but experts could figure it out easily. RootViewController.h #import <UIKit/UIKit.h> #import "ContentViewController.h" @interface RootViewController : UITableViewController { ContentViewController *contentViewController; } @property (nonatomic, retain) ContentViewController *contentViewController; - (NSString*)getContentFileName:(NSString*)title; //<--- This function declartion @end RootViewController.m #import "RootViewController.h" #import "HAWATAppDelegate.h" #import "ContentViewController.h" @implementation RootViewController @synthesize contentViewController; ... more methods ... #pragma mark - #pragma mark Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { HAWATAppDelegate *appDelegate = (HAWATAppDelegate *)[[UIApplication sharedApplication] delegate]; NSString *title = (NSString *) [appDelegate.titles objectAtIndex:indexPath.row]; NSString *fileName = getContentFileName:title; //<--- Here is the error ... } - (NSString*) getContentFileName:(NSString*)title { return [title lowercaseString]; } @end There must be a simple thing I'm missing. Please let me know. Thanks in advance.

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C vs C++ function questions

- by james

I am learning C, and after starting out learning C++ as my first compiled language, I decided to "go back to basics" and learn C. There are two questions that I have concerning the ways each language deals with functions. Firstly, why does C "not care" about the scope that functions are defined in, whereas C++ does? For example, int main() { donothing(); return 0; } void donothing() { } the above will not compile in a C++ compiler, whereas it will compile in a C compiler. Why is this? Isn't C++ mostly just an extension on C, and should be mostly "backward compatible"? Secondly, the book that I found (Link to pdf) does not seem to state a return type for the main function. I check around and found other books and websites and these also commonly do not specify return types for the main function. If I try to compile a program that does not specify a return type for main, it compiles fine (although with some warnings) in a C compiler, but it doesn't compile in a C++ compiler. Again, why is that? Is it better style to always specify the return type as an integer rather than leaving it out? Thanks for any help, and just as a side note, if anyone can suggest a better book that I should buy that would be great!

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September OTN Member Offers

- by Cassandra Clark - OTN

Oracle OpenWolrd and JavaOne are coming....so the OTN team is knee deep in planning the OTN Lounges that will be at each event this year (more info in another post soon), but we managed to work with our partners to offer a nice BIG list of NEW offers for September. Visit Oracle Technology Network Member Discount page for codes and links to these great offers! Oracle Press Oracle Technology Network members get 40% off the newest Oracle Press title, Oracle Exalogic Elastic Cloud Handbook by Tom Plunkett! Mike Murach & Associates, Inc. Get 30% off and sample chapter of Murach’s SQL Server 2012 for Developers by Bryan Syverson and Joel Murach Manning - 41% off titles below and sample chapter of each. Making Java Groovy OCA Java SE 7 Programmer I Certification Guide Apress - Get 30% off on apress.com on Java 7 Recipes A Problem-Solution Approach Safari Books Online - OTN members get 30 days of free access + 20% off unlimited access to Safari Books Online for 6 months. Safari Books Online offers subscription access to more than 24,000 books and training videos about technology, digital media, business management and professional development from leading publishers such as Oracle Press, O'Reilly Media, Que, Addison-Wesley, Wrox, Cisco Press, Microsoft Press, McGraw Hill, Wiley, Apress, Adobe Press and many others. Already a customer? Come see us at Oracle OpenWorld (booth 537) or JavaOne (5110) and mention this to get a shirt!

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November New Member Offers

- by Cassandra Clark - OTN

Happy November! OTN has worked with its partners to bring you more new offers or extend their existing ones.Oracle Press New Offer-Oracle Technology Network members get 40% off the newest Oracle Press titles by Oracle ACE Mark Rittman, Oracle Business Intelligence 11g Developers Guide and Oracle Exalytics Revealed (ebook format only).Extended Offers - Oracle Store - Save 10% on Your Next Software Purchase from the Oracle StorePearson Publistiong - 35% off Hacker’s Delight Manning Publishing - 41% off the MEAP, eBook and print format of the following books: Making Java Groovy OCA Java SE 7 Programmer I Certification Guide Safari Books Online - OTN members get 30 days of free access + 20% off unlimited access to Safari Books Online for 6 months. Packt Publishing - 25% off the print books and 35% off the eBooks listed below: Getting Started with Oracle Data Integrator 11g: A Hands-On Tutorial Oracle Business Intelligence Enterprise Edition 11g: A Hands-On Tutorial Oracle Certified Associate, Java SE 7 Programmer Study Guides. Murach Publishing - Get 30% off for OTN members - Murach’s SQL Server 2012 for Developers by Bryan Syverson and Joel Murach. Get all of this From the OTN Member Discount Page!

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Potential issues using member's "from" address and the "sender" header

- by Paul Burney

Hi all, A major component of our application sends email to members on behalf of other members. Currently we set the "From" address to our system address and use a "Reply-to" header with the member's address. The issue is that replies from some email clients (and auto-replies/bounces) don't respect the "Reply-to" header so get sent to our system address, effectively sending them to a black hole. We're considering setting the "From" address to our member's address, and the "Sender" address to our system address. It appears this way would pass SPF and Sender-ID checks. Are there any reasons not to switch to this method? Are there any other potential issues? Thanks in advance, -Paul Here are way more details than you probably need: When the application was first developed, we just changed the "from" address to be that of the sending member as that was the common practice at the time (this was many years ago). We later changed that to have the "from" address be the member's name and our address, i.e., From: "Mary Smith" <[email protected]> With a "reply-to" header set to the member's address: Reply-To: "Mary Smith" <[email protected]> This helped with messages being mis-categorized as spam. As SPF became more popular, we added an additional header that would work in conjunction with our SPF records: Sender: <[email protected]> Things work OK, but it turns out that, in practice, some email clients and most MTA's don't respect the "Reply-To" header. Because of this, many members send messages to [email protected] instead of the desired member. So, I started envisioning various schemes to add data about the sender to the email headers or encode it in the "from" email address so that we could process the response and redirect appropriately. For example, From: "Mary Smith" <[email protected]> where the string after "messages" is a hash representing Mary Smith's member in our system. Of course, that path could lead to a lot of pain as we need to develop MTA functionality for our system address. I was looking again at the SPF documentation and found this page interesting: http://www.openspf.org/Best_Practices/Webgenerated They show two examples, that of evite.com and that of egreetings.com. Basically, evite.com is doing it the way we're doing it. The egreetings.com example uses the member's from address with an added "Sender" header. So the question is, are there any potential issues with using the egreetings method of the member's from address with a sender header? That would eliminate the replies that bad clients send to the system address. I don't believe that it solves the bounce/vacation/whitelist issue since those often send to the MAIL FROM even if Return Path is specified.

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