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  • VB.NET: short cuts in code

    - by Craig Johnston
    Why is the following VB.NET code setting str to Nothing in my VS2005 IDE: If Trim(str = New StreamReader(OpenFile).ReadToEnd) <> "" Then Button2.Enabled = True TextBox1.Text = fname End If OpenFile is a Function that returns a FileStream

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  • Return caret postion or range of a div in IE8

    - by Robin
    I am wanting to return the start and end range or the caret postion inside a div. The div will have the attribute contentEditable. typically I would use document.selection.createRange(); but the createRange function is broken in IE8 is there a way to get around this?

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  • Compute hash of class code at runtime (C#)?

    - by Breck Fresen
    Is it possible to compute the hash of a class at runtime in C# (presumably through reflection)? To be clear, I don't want to compute the hashcode of an instance of said class, I want to compute the hash of the class code itself (if a function in the class changes, I'd expect a different hash code to be computed). Ideally this would only be sensitive to changes in the object code (and not just a hash of the string representation of the code itself). Thanks in advance for your help, -- Breck

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  • C++ type-checking at compile-time

    - by Masterofpsi
    Hi, all. I'm pretty new to C++, and I'm writing a small library (mostly for my own projects) in C++. In the process of designing a type hierarchy, I've run into the problem of defining the assignment operator. I've taken the basic approach that was eventually reached in this article, which is that for every class MyClass in a hierarchy derived from a class Base you define two assignment operators like so: class MyClass: public Base { public: MyClass& operator =(MyClass const& rhs); virtual MyClass& operator =(Base const& rhs); }; // automatically gets defined, so we make it call the virtual function below MyClass& MyClass::operator =(MyClass const& rhs); { return (*this = static_cast<Base const&>(rhs)); } MyClass& MyClass::operator =(Base const& rhs); { assert(typeid(rhs) == typeid(*this)); // assigning to different types is a logical error MyClass const& casted_rhs = dynamic_cast<MyClass const&>(rhs); try { // allocate new variables Base::operator =(rhs); } catch(...) { // delete the allocated variables throw; } // assign to member variables } The part I'm concerned with is the assertion for type equality. Since I'm writing a library, where assertions will presumably be compiled out of the final result, this has led me to go with a scheme that looks more like this: class MyClass: public Base { public: operator =(MyClass const& rhs); // etc virtual inline MyClass& operator =(Base const& rhs) { assert(typeid(rhs) == typeid(*this)); return this->set(static_cast<Base const&>(rhs)); } private: MyClass& set(Base const& rhs); // same basic thing }; But I've been wondering if I could check the types at compile-time. I looked into Boost.TypeTraits, and I came close by doing BOOST_MPL_ASSERT((boost::is_same<BOOST_TYPEOF(*this), BOOST_TYPEOF(rhs)>));, but since rhs is declared as a reference to the parent class and not the derived class, it choked. Now that I think about it, my reasoning seems silly -- I was hoping that since the function was inline, it would be able to check the actual parameters themselves, but of course the preprocessor always gets run before the compiler. But I was wondering if anyone knew of any other way I could enforce this kind of check at compile-time.

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  • Cross Join 'n' times a table

    - by SDReyes
    It is possible to write a generic function/procedure/select/somethingElse to cross-join a table against himself 'n' times? (yes, 'n' is a given parameter : ) How would you do it? Example Having this table: Value ------- 1 2 3 cross join it 2 times, would return: Value | Value ------------------ 1 1 1 2 1 3 2 1 2 2 2 3 3 1 3 2 3 3

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  • Javascript: getting element in dom tree when mouseover

    - by oimoim
    Hi, When using : document.onmouseover = function(e) {} Is there a property which gives me the element in the dom tree ? For example, I can set a style to e.srcElement But, how can I later access this element to (for example) reset its style ? And how can I know at which place in the dom tree it is ? I want to be able to situate it in the whole page dump. Many thanks.

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  • Placing a window near the system tray

    - by user227990
    I am writing a program that needs to set a window just above/below the traybar for gtk. I have tried using the 2 approaches that failed. One was using the gtk_status_icon_position_menu function and placing the window in the point where the user clicks (in the tray bar). The problem is that these solutions work in gnome(Linux) but not in Windows. In Linux they work because the window manager doesn't seem to allow placement of windows in the tray panel, honoring the closest possible. In Windows this doesn't happen and the window can go "out" of the screen which understandably is not desired. With this said i went out for a work around. My idea was to set the window in the location of mouse click and get the x and y coordinates of a normal window placement and with it's size check if it would be within the screen boundaries. If it was not make the correction. I have came up with the functions needed but for some reason the gdk_drawable_get_size(window-window ,&WindowWidth, &WindowHeight) and other similar functions only give the correct size value after the second run of the signal function. The result of the first run is just 1 to both size and width. (I have read the issue of X11 not giving correct results, but i think this is not it) event_button = (GdkEventButton *) event; if (event_button->button == 1) { if (active == 0) { gboolean dummy; gint WindowHeight, WindowWidth, WindowPosition[2]; GdkScreen *screen; gint ScreenHeight, ScreenWidth; dummy = FALSE; gtk_widget_show_all(window); gtk_window_present(GTK_WINDOW(window)); gtk_status_icon_position_menu(menu, &pos[X], &pos[Y], &dummy, statusicon); gtk_window_move(GTK_WINDOW(window), pos[X],pos[Y]); gdk_drawable_get_size(window->window ,&WindowWidth, &WindowHeight); screen = gtk_status_icon_get_screen(statusicon); ScreenWidth = gdk_screen_get_width(screen); ScreenHeight = gdk_screen_get_height(screen); g_print("Screen: %d, %d\nGeometry: %d, %d\n",ScreenWidth, ScreenHeight, WindowWidth, window->allocation.height); gtk_entry_set_text(GTK_ENTRY(entry),""); active = 1; return TRUE; } How can i do what i want in a portable way?

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  • To detect if the user is closing the IE browser apart from onunload event, as it is triggerred when

    - by AndAars
    hi, After being through numerous forums available on the net for last 5 days, I am still not able to completely track down the browser close event. My requirement is to generate a popup message, when user tries to close the browser. I have called my javascript function on body 'onbeforeunload' event. And I have hardcoded the conditions to check the mouse-coordinates for the red 'X' buton of browser, refresh, File-close or Alt-F4. My code works fine when browser window is Maximized, but fails if we shrink it after a limit. Please help me, if some body has already found the solution to a similar problem. Thank you. Aggregated Responses of OP Ok, just tell me if it is possible to detect if a user has clicked on the Refresh button of the browser. Also, Refresh can be triggered by Right-click - Refresh or Ctrl-R. My requirement is to make a variable false on Refresh. I am just able to do it on F5, but all other ways are still out of my reach. The same would be applied to Back buton. Hi ppl, Thanks for all who replied atleast. I have talked to my seniors regarding this and they have now understood and have compromised with the browser menu buttons. So now my task has become easy. Now, I am using a variable and making it true by default. As, I mentioned earlier I just have to catch the onbeforeunload and popup a message when user tries to leave. The message will not popup when user is navigating to other pages, as I have made the variable as false on all the links of my page using following piece of code: document.onclick = function() { //To check if user is navigating from the page by clicking on a hyperlink. if (event.srcElement.tagName == 'A') blnShowMsg = false; //To not popup the warning message else blnShowMsg = true; //To popup the warning message } In my case still the message is shown when user does Refresh, back or goes to any link in Favorites, etc. Thanks buddy, but I have already gone through that and didn't find much help there too. My seniors are not happy with that solution as putting a flag on evry link of my application is a complicated job and they fear of breaking the application. Any other suggestions would be appreciated. Thanks once again. Is there no one who can think of a solution here!!! where are all the experts???

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  • What to Return? Error String, Bool with Error String Out, or Void with Exception

    - by Ranger Pretzel
    I spend most of my time in C# and am trying to figure out which is the best practice for handling an exception and cleanly return an error message from a called method back to the calling method. For example, here is some ActiveDirectory authentication code. Please imagine this Method as part of a Class (and not just a standalone function.) bool IsUserAuthenticated(string domain, string user, string pass, out errStr) { bool authentic = false; try { // Instantiate Directory Entry object DirectoryEntry entry = new DirectoryEntry("LDAP://" + domain, user, pass); // Force connection over network to authenticate object nativeObject = entry.NativeObject; // No exception thrown? We must be good, then. authentic = true; } catch (Exception e) { errStr = e.Message().ToString(); } return authentic; } The advantages of doing it this way are a clear YES or NO that you can embed right in your If-Then-Else statement. The downside is that it also requires the person using the method to supply a string to get the Error back (if any.) I guess I could overload this method with the same parameters minus the "out errStr", but ignoring the error seems like a bad idea since there can be many reasons for such a failure... Alternatively, I could write a method that returns an Error String (instead of using "out errStr") in which a returned empty string means that the user authenticated fine. string AuthenticateUser(string domain, string user, string pass) { string errStr = ""; try { // Instantiate Directory Entry object DirectoryEntry entry = new DirectoryEntry("LDAP://" + domain, user, pass); // Force connection over network to authenticate object nativeObject = entry.NativeObject; } catch (Exception e) { errStr = e.Message().ToString(); } return errStr; } But this seems like a "weak" way of doing things. Or should I just make my method "void" and just not handle the exception so that it gets passed back to the calling function? void AuthenticateUser(string domain, string user, string pass) { // Instantiate Directory Entry object DirectoryEntry entry = new DirectoryEntry("LDAP://" + domain, user, pass); // Force connection over network to authenticate object nativeObject = entry.NativeObject; } This seems the most sane to me (for some reason). Yet at the same time, the only real advantage of wrapping those 2 lines over just typing those 2 lines everywhere I need to authenticate is that I don't need to include the "LDAP://" string. The downside with this way of doing it is that the user has to put this method in a try-catch block. Thoughts? Is there another way of doing this that I'm not thinking of?

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  • PHP script loading took over 10 seconds

    - by Misiur
    My again. I've promised to not come back today, but I've got another trouble. http://www.misiur.com/me/ - it took over 10 seconds to load. Whole site code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="pl" lang="pl"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>{site('title')}</title> <link rel="stylesheet" type="text/css" href="{site('themeDir')}/global.css" /> </head> <body> <div id="site"> <div id="footer"> <p>Site Managment System {site('version')} by <a href="http://www.misiur.com">Misiur</a>. Copyright &copy; 2010-{$currYear}.</p> </div> </div> </body> I think the trouble is in this piece of code: private function replaceFunc($subject) { foreach($this->func as $t) { preg_match_all('/\{'.$t.'\([a-zA-Z,\']+\)\}/i', $subject, $res); for($j = 0; $j < sizeof($res[0]); $j++) { preg_match('/\([a-zA-Z,\']+\)/i', $res[0][$j], $match); if($match > 0) { $prep = explode(", ", substr($match[0], 1, -1)); $args = array(); for($i = 0; $i < sizeof($prep); $i++) { $args[] = substr($prep[$i], 1, -1); } } else { $args = array(); } $subject = preg_replace('/\{'.$t.preg_quote($match[0]).'\}/i', call_user_func_array($t, $args), $subject); } } return $subject; } It has to find functions from array ($this-func), cut out arguments, and call function with them. I think that I've messed up. Help.

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  • Comparing file contents in F#

    - by Bartosz Milewski
    I wrote a quick and dirty function to compare file contents (BTW, I have already tested that they are of equal size): let eqFiles f1 f2 = let bytes1 = Seq.ofArray (File.ReadAllBytes f1) let bytes2 = Seq.ofArray (File.ReadAllBytes f2) let res = Seq.compareWith (fun x y -> (int x) - (int y)) bytes1 bytes2 res = 0 I'm not happy with reading the whole contents into an array. I'd rather have a lazy sequence of bytes, but I can't find the right API in F#.

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  • How to disable jQuery.jplayer autoplay?

    - by Mr_Nizzle
    when i initialize the player like this: $("#jquery_jplayer").jPlayer({ ready: function () { this.element.jPlayer("setFile", "/previews/cancion.mp3", "/previews/horse.ogg").jPlayer("play"); }, volume: 50, oggSupport: true }) is there any way to disable the autoplay?

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  • OnChange not firing in IE11

    - by bulletproof
    The date picker we use is created in a javascript library. It has a dropdown for the month and year and when these change it fires an onChange event to run a function that refreshes the dates displayed. Below is the function that creates the calendar. function makeCalendar(intWhatMonth,intWhatYear,bViewOnly) { if (bViewOnly) {intWhatMonth-=1;} var strOutput = ''; var intStartMonth=intWhatMonth; var intStartYear=intWhatYear; var intLoop; var strTemp=''; var strDateColWidth; dteCur.setMonth(intWhatMonth); dteCur.setFullYear(intWhatYear); dteCur.setDate(dteToday.getDate()); dteCur.setHours(0);dteCur.setMinutes(0);dteCur.setSeconds(0);dteCur.setMilliseconds(0); if (!(bViewOnly)) { strTemp='<form name="spiffyCal">'; } // special case for form not to be inside table in Netscape 6 if (scNN6) { strOutput += strTemp +'<table width="210" border="3" class="cal-Table" cellspacing="0" cellpadding="0"><tr>'; } else { strOutput += '<table width="210" border="3" class="cal-Table" cellspacing="0" cellpadding="0">'+strTemp+'<tr>'; } if (!(bViewOnly)) { strOutput += '<td class="cal-HeadCell" align="center" width="100%"><a href="javascript:'+this.varName+'.clearDay();"><img name="calbtn1" src="'+strDefBtnImgPath+'btn_del_small.gif" border="0" width="12" height="10"></a>&nbsp;&nbsp;<a href="javascript:'+this.varName+'.scrollMonth(-1);" class="cal-DayLink">&lt;</a>&nbsp;<SELECT class="cal-ComboBox" id="cboMonth" NAME="cboMonth" onChange="'+this.varName+'.changeMonth();">'; for (intLoop=0; intLoop<12; intLoop++) { if (intLoop == intWhatMonth) strOutput += '<OPTION VALUE="' + intLoop + '" SELECTED>' + msNames[intLoop] + '<\/OPTION>'; else strOutput += '<OPTION VALUE="' + intLoop + '">' + msNames[intLoop] + '<\/OPTION>'; } strOutput += '<\/SELECT><SELECT class="cal-ComboBox" id="cboYear" NAME="cboYear" onChange="'+this.varName+'.changeYear();">'; for (intLoop=this.minYearChoice; intLoop<this.maxYearChoice; intLoop++) { if (intLoop == intWhatYear) strOutput += '<OPTION VALUE="' + intLoop + '" SELECTED>' + intLoop + '<\/OPTION>'; else strOutput += '<OPTION VALUE="' + intLoop + '">' + intLoop + '<\/OPTION>'; } strOutput += '<\/SELECT>&nbsp;<a href="javascript:'+this.varName+'.scrollMonth(1);" class="cal-DayLink">&gt;</a>&nbsp;&nbsp;<a href="javascript:'+this.varName+'.hide();"><img name="calbtn2" src="'+strDefBtnImgPath+'btn_close_small.gif" border="0" width="12" height="10"></a><\/td><\/tr><tr><td width="100%" align="center">'; } else { strOutput += '<td class="cal-HeadCell" align="center" width="100%">'+msNames[intWhatMonth]+'-'+intWhatYear+'<\/td><\/tr><tr><td width="100%" align="center">'; } firstDay = new Date(intWhatYear,intWhatMonth,1); startDay = firstDay.getDay(); if (((intWhatYear % 4 == 0) && (intWhatYear % 100 != 0)) || (intWhatYear % 400 == 0)) msDays[1] = 29; else msDays[1] = 28; strOutput += '<table width="210" cellspacing="1" cellpadding="2" border="1"><tr>'; for (intLoop=0; intLoop<7; intLoop++) { if (intLoop==0 || intLoop==6) { strDateColWidth="15%" } else { strDateColWidth="14%" } strOutput += '<td class="cal-HeadCell" width="' + strDateColWidth + '" align="center" valign="middle">'+ msDOW[intLoop] +'<\/td>'; } strOutput += '<\/tr><tr>'; var intColumn = 0; var intLastMonth = intWhatMonth - 1; var intLastYear = intWhatYear; if (intLastMonth == -1) { intLastMonth = 11; intLastYear=intLastYear-1;} for (intLoop=0; intLoop<startDay; intLoop++, intColumn++) { strOutput += this.getDayLink(true,(msDays[intLastMonth]-startDay+intLoop+1),intLastMonth,intLastYear,bViewOnly); } for (intLoop=1; intLoop<=msDays[intWhatMonth]; intLoop++, intColumn++) { strOutput += this.getDayLink(false,intLoop,intWhatMonth,intWhatYear,bViewOnly); if (intColumn == 6) { strOutput += '<\/tr><tr>'; intColumn = -1; } } var intNextMonth = intWhatMonth+1; var intNextYear = intWhatYear; if (intNextMonth==12) { intNextMonth=0; intNextYear=intNextYear+1;} if (intColumn > 0) { for (intLoop=1; intColumn<7; intLoop++, intColumn++) { strOutput += this.getDayLink(true,intLoop,intNextMonth,intNextYear,bViewOnly); } strOutput += '<\/tr><\/table><\/td><\/tr>'; } else { strOutput = strOutput.substr(0,strOutput.length-4); // remove the <tr> from the end if there's no last row strOutput += '<\/table><\/td><\/tr>'; } if (scNN6) { strOutput += '<\/table><\/form>'; } else { strOutput += '<\/form><\/table>'; } dteCur.setDate(1); dteCur.setHours(0);dteCur.setMinutes(0);dteCur.setSeconds(0);dteCur.setMilliseconds(0); dteCur.setMonth(intStartMonth); dteCur.setFullYear(intStartYear); return strOutput; } this.makeCalendar=makeCalendar; We have recently upgraded to IE11 and it is not firing this event anymore. I've tested this in an earlier version of IE and also in Chrome and it works as expected. The functions called from the anchor tags are working as expected. Creating a dropdown with an onChange event in html works in IE11. Has anyone come across anything like this in IE11? I have checked the console and it is showing no errors.

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  • jQuery; combine user click and :checked

    - by user275074
    I have two blocks of code which basically check for 1) a click event on a radio button e.g. $("input[id='frmSkill']").click(function(){ //do something }); And 2) a block of code to check if a radio button is :checked, if so, then perform some actions e.g. if($("input[id='frmSkill']:checked").val()){ //do something }); What I'd like to do is combine the two in order to reduce the code as the actions performed under each are the same.

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  • What does this construct mean?

    - by ArneRie
    Iam debugging some javascript, and cant explain what this "||" does? loadingError: function(title, msg){ var title = title || 'Error'; var msg = msg || 'Error on Request'; new my.widget.InformationBox({ title: title, message: msg, type: 'error' }).show(); } Can someone give me an hint, why this guy is using var title = title || 'ERROR' ??

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  • Can parser combination be made efficient?

    - by Jon Harrop
    Around 6 years ago, I benchmarked my own parser combinators in OCaml and found that they were ~5× slower than the parser generators on offer at the time. I recently revisited this subject and benchmarked Haskell's Parsec vs a simple hand-rolled precedence climbing parser written in F# and was surprised to find the F# to be 25× faster than the Haskell. Here's the Haskell code I used to read a large mathematical expression from file, parse and evaluate it: import Control.Applicative import Text.Parsec hiding ((<|>)) expr = chainl1 term ((+) <$ char '+' <|> (-) <$ char '-') term = chainl1 fact ((*) <$ char '*' <|> div <$ char '/') fact = read <$> many1 digit <|> char '(' *> expr <* char ')' eval :: String -> Int eval = either (error . show) id . parse expr "" . filter (/= ' ') main :: IO () main = do file <- readFile "expr" putStr $ show $ eval file putStr "\n" and here's my self-contained precedence climbing parser in F#: let rec (|Expr|) (P(f, xs)) = Expr(loop (' ', f, xs)) and shift oop f op (P(g, xs)) = let h, xs = loop (op, g, xs) loop (oop, f h, xs) and loop = function | ' ' as oop, f, ('+' | '-' as op)::P(g, xs) | (' ' | '+' | '-' as oop), f, ('*' | '/' as op)::P(g, xs) | oop, f, ('^' as op)::P(g, xs) -> let h, xs = loop (op, g, xs) let op = match op with | '+' -> (+) | '-' -> (-) | '*' -> (*) | '/' -> (/) | '^' -> pown loop (oop, op f h, xs) | _, f, xs -> f, xs and (|P|) = function | '-'::P(f, xs) -> let f, xs = loop ('~', f, xs) P(-f, xs) | '('::Expr(f, ')'::xs) -> P(f, xs) | c::xs when '0' <= c && c <= '9' -> P(int(string c), xs) My impression is that even state-of-the-art parser combinators waste a lot of time back tracking. Is that correct? If so, is it possible to write parser combinators that generate state machines to obtain competitive performance or is it necessary to use code generation?

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  • ASP.NET MVC form GET passing array

    - by creativeincode
    I have a form with a collection of checkbox's for a refine search function on my website. I am trying to pass an array in a form GET but the URL looks like: /search?filter=foo&filter=bar&filter=green Is there a better way to pass this in MVC? Possible like /search?filter=foo,bar,green Thanks in advance.

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  • Error while compiling the Xcode project (IPhone)

    - by Sridhar
    Hello, I added ffmpeg iphone port into my library and I can able to use a few of its functions like avcodec_init(),.. without any errors. But when I include this function call "avcodec_register_all" Xcode is giving error after compilation The error message is : *--------------- ld: ldr 12-bit displacement out of range (4276 max +/-4096) in _CFRelease$stub in _CFRelease$stub from /Users/foxit/Documents/CameraTest/build/CameraTest.build/Debug-iphoneos/CameraTest.build/Objects-normal/armv6/CameraTest Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1 *------------- Does anyone know whats wrong with this ? Regards, Raghu

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  • JavaScript: using constructor without operator 'new'

    - by GetFree
    Please help me to understand why the following code works: <script> var re = RegExp('\\ba\\b') ; alert(re.test('a')) ; alert(re.test('ab')) ; </script> In the first line there is no new operator. As far as I know, a contructor in JavaScript is a function that initialize objects created by the operator new and they are not meant to return anything.

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