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Articles indexed Friday June 11 2010

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  • How to receive packets on the MCU's serial port?

    - by itisravi
    Hello, Consider this code running on my microcontroller unit(MCU): while(1){ do_stuff; if(packet_from_PC) send_data_via_gpio(new_packet); //send via general purpose i/o pins else send_data_via_gpio(default_packet); do_other_stuff; } The MCU is also interfaced to a PC via a UART.Whenever the PC sends data to the MCU, the *new_packet* is sent, otherwise the *default_packet* is sent.Each packet can be 5 or more bytes with a pre defined packet structure. My question is: 1.Should i receive the entire packet from PC using inside the UART interrut service routine (ISR)? In this case, i have to implement a state machine inside the ISR to assemble the packet (which can be lengthy with if-else or switch-case blocks). 2.Detect a REQUEST command (one byte)from the PC in my ISR set a flag, diable UART interrupt alone and form the packet in my while(1) loop by polling the UART?

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  • Struts or Spring MVC or Struts & Spring?

    - by Shaw
    I need some information to understand design decision: Is Struts a better choice than Spring MVC? I hear about Strus-Spring-Hibernae combo - Is struts used at MVC layer because its a matured framework than when compared to Spring MVC? Any one used this combination for projects or aware of issues?

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  • Object in Array is not recognised as having "methods"

    - by kevin Mendoza
    I got my application working Awhile back, but after completely and accidentally deleting it, I have tried to create it from square one. unfortunately my rewritten program is a bit cranky; does anyone see or know the possible sources of error? Also, my if statements are acting up. -(void)loadAnnotations { CLLocationCoordinate2D workingCoordinate; iProspectLiteAppDelegate *appDelegate = (iProspectLiteAppDelegate *)[[UIApplication sharedApplication] delegate]; NSMutableArray *mines =[[NSMutableArray alloc] initWithArray:(NSMutableArray *) appDelegate.mines]; BOOL gold = [[NSUserDefaults standardUserDefaults] boolForKey:@"goldControl"]; BOOL silver = [[NSUserDefaults standardUserDefaults] boolForKey:@"silverControl"]; BOOL copper = [[NSUserDefaults standardUserDefaults] boolForKey:@"copperControl"]; for(id mine in mines) { NSLog(@"in the loop"); workingCoordinate.latitude = [[mine latitudeInitial] doubleValue]; workingCoordinate.longitude = [[mine longitudeInitial] doubleValue]; iProspectLiteAnnotation *tempMine = [[iProspectLiteAnnotation alloc] initWithCoordinate:workingCoordinate]; [tempMine setTite:[mine mineName]]; if ([[mine commodity] isEqualToString:@"Gold"] && [gold == YES]) { [tempMine setAnnotationType:iProspectLiteAnnotationTypeGold]; [mapView addAnnotation:tempMine]; } if([[mine commodity] isEqualToString:@"Silver"] && [silver == YES]) { [tempMine setAnnotationType:iProspectLiteAnnotationTypeSilver]; } if([[mine commodity] isEqualToString:@"Copper"] && [copper == YES]) { [tempMine setAnnotationType:iProspectLiteAnnotationTypeCopper]; } } [mines dealloc]; } where the workingCoordinate.latitude = [[mine latitudeInitial] doubleValue], as well as the longitude, and [mine mineName],it says " No '-latitudeInitiallongitudeInitial' method found" or the mineName/LongitudeInitial. also, it complains about : before ] at all the if statement lines. I don't see any errors, do you?

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  • why use the "!!!"?

    - by lazyanno
    as follow codes: var a = {}; if(!!!a[tabType]){ a[tabType] = []; a[tabType].push([self,boxObj]); }else{ a[tabType].push([self,boxObj]); } i think !!!a[tabType] equals !a[tabType] why use the "!!!" not "!" ? thank you!

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  • How to force Json.Net to put an integer value into a string field?

    - by Earlz
    Hello, in using Json.Net I have a class like this class Foo{ public string name; public string value; } and I have a JSON string that looks like this: [{"name": "some name","value": "1"}] The problem with this is that Json.Net detects "1" as being an integer(due to ambiguities with JSON) and will refuse to put it into the string value of Foo How can I override this behavior so that it will put the string "1" into value?

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  • asp.net mvc making delete usercontrol information passing on and off

    - by mazhar kaunain baig
    i am creating a generalize deleteusercontrol , my aim is that on the listing page where all the records are listed when the delete is pressed i want to display the acknowledgment on the same page up the list. I had little idea to do that q1) first of all where will i place my deleteusercontrol(in the shared folder?). q2) on and off the deleteusercontrol as the acknowledgment will not be there all the time how would i be doing that on delete press. i don't want to pass any data in the querystring. q3)how would i be passing the records list id and listname to the general deleteusercontrol as it would be same for all the listing

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  • Can pdflatex (or any tex package) automatically rescale included images which have been reduced in s

    - by drfrogsplat
    I'm writing my thesis in LaTeX, generating it with pdflatex. I have a large number of figures, many of which are bitmaps (as opposed to SVG) in PNG/JPEG format. I've generally created them to be fairly high resolution (say 1600x1200-ish) to ensure that whatever size they end up in the document, they'll be at least 300dpi when printed. As I'm writing/laying out the document, I'm including graphics (using \includegraphics from the graphicx package) and setting widths/heights as appropriate (e.g. subfigures are quite small). I don't need the images to be any more than about 300 dpi at best, so where I have shrunk a 1600x1200 image down to say 5cm, the image is now at 800 dpi. So despite including some very small (on the page) images, the PDF is becoming quite large. Is there a way to tell pdflatex or graphicx (or something else involved?) to convert all images to a maximum of 300 dpi, based on the dimensions I'm setting with say \includegraphics[width=2in]{filename}? i.e. so it scales the image to a max of 600x600 pixels as it includes it in the PDF (leaving the original file untouched). I know I can resize the original images with various command line applications, and include the pre-resized versions, but given the images vary in size considerably, it wouldn't be as simple as making sure they're all 300dpi for a constant printed size. It'd also be nice to be able to easily create different versions of PDFs (web vs final print) without resizing images manually, so that the 'web' PDF capped images at say 72-100 dpi while the final print one could cap at 600 (if at all).

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  • How change column names randomly in gridview?

    - by James123
    I am struggling to show different views of gridview with database values. Here is my requirement. Database Table: I need to show one drop downlist with three values 1,2,3. If user selects 3 i Need to show a grid like below Age,AnnualSales and Assortment are names which are coming dynamically from database. High,Medium and Core all are values Here my question is I need to show same attribute names. Like If the name changes from "Assortment" to "Location" I need to show it in different page index . In page index 2 i need to show like below. Please help with solution

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  • debugging connection to mysql from python script using MySQLdb

    - by timpone
    I am a python newbie and have a python 2.5 script that is using MySQLdb to connect on OS X 10.5.8. I haven't been able to succesfully connect to the database of interest with this. However, I am able to connect using php's mysqli and also via the mysql cli interface. I get the error: File "build/bdist.macosx-10.5-i386/egg/MySQLdb/connections.py", line 188, in __init__ _mysql_exceptions.OperationalError: (1045, "Access denied for user 'arc_development'@'localhost' (using password: YES)") On my linux box which has the same mysql perms, the script works fine logging in. On my OS X laptop, I am able to create a database named test_python which bypasses mysql authentication scheme. This makes me think that issues like 32bit / 64bit incompatabilities aren't occuring. If I turn on the query log, I get access denied: 100610 20:56:55 4 Connect Access denied for user 'arc_development'@'localhost' (using password: YES) I'm a little bit at a loss to what to do next. Is there any way I can specify in the general log or binary log to get the actual password set on the connection string? How about writing out from connections.py file the value (although not sure how I'd do that)? thanks

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  • Should I use MEF or Prism for my Silverlight project?

    - by Daniel
    Hi! My team(3 developers) will be building a Silverlight LOB application. This is the first Silverlight project for us. We've been doing mostly Winforms. We'll be using Silverlight4 / VS2010 / possibly WCF RIA Services, and ASP.NET Web application to handle authentication and host the silverlight pages. We need a way to.. Modularize the silverlight project so we can work in different parts of the application, then integrate them. Dynamically load different parts of the application, so the initial download size of the xap file wouldn't be too large. After some research, I found out that Prism and MEF are possible solutions to these goals. Can you give me advice on which framework to use? or possibly another solution? We don't have much experience on Silverlight and the project needs to be finished in 3 months, so the learning curves for frameworks should be considered. Thank you for reading! Any inputs will be much appreciated.

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  • Adding keys to superglobals in php

    - by gautam kumar
    Is there any way by which I can add keys to superglobals in php without defining the corresponding values to those key? For example: $_SESSION['key']='set';//key` automatically gets defined. But I want to do something like this add_key($_SESSION,'key')//key is added to $_SESSION array. Is it possible?

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  • Moving 2d objects on a 3d plane - AS3

    - by Borkz
    I have a 2d plane rotated on its x axis, with 2d display objects I want to move around on the plane. Its pretty similar to a chess board: http://static.open.salon.com/files/chess011237853612.jpg The board is a rotated rectangle, and the pieces are just 2d display objects. Whats the easiest way to manipulate those objects so they appear to be moving on the board?

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  • Obtaining photo 'stars' rating using PHP

    - by DarwinIcesurfer
    I am trying to extract the photo 'stars' rating from .jpg files using php code. My intent is to show the highest rated images as part of a slideshow. I found that using the PHP_JPEG_Metadata_Toolkit_1.11 I am able to get the rating of the file if the rating is set from within Vista (Right click - Properties - Details - Set rating by clicking on stars) by reading the array returned by the Metadata_Toolkit $exif = get_EXIF_JPEG( $photodir . "/" . $filename ); $rating = $exif[0][18246]['Data'][0]; However if I set the rating using Adobe Bridge, I can see the 'stars' in Vista, but the $exif[0][18246]['Data'][0] returns a null value. Is PHP code available to read the ratings applied by both Windows Vista AND Adobe Bridge?

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  • installation of mac 10.6.2

    - by mahesh
    hi i installed vmware workstation 7.0 in windows,and it working well.i installed mac os 10.4.8 in it as a guest it is alo working well,but while installin mac os 10.6.2 it dont installed and shows an error as "invalid front-side bus freqency 66000000 hz. disablin the cpu." please help me how to solve this and please suggest any link to easyly understand installation if mac os 10.6.2

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  • Foreign Keys in SQLITE in the Google Gears framework

    - by Maxim Gershkovich
    Hi all, Could someone please tell me why the following foreign key constraint (although executes fine) is not enforced by SQLITE? Could someone pleasse provide an example of how I can go about enforcing the relationship? CREATE TABLE User (UserID TEXT Unique NOT NULL PRIMARY KEY, FirstName TEXT NOT NULL, LastName TEXT NOT NULL, Username TEXT NOT NULL, Password TEXT NOT NULL, Email TEXT NOT NULL, SignupDate TEXT NOT NULL) CREATE TABLE Category (CategoryID TEXT Unique NOT NULL PRIMARY KEY, UserID TEXT, FOREIGN KEY(UserID) REFERENCES User(UserID))

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