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• Python - Finding unicode/ascii problems

  - by user330739

  Hi all, I am csv.reader to pull in info from a very long sheet. I am doing work on that data set and then I am using the xlwt package to give me a workable excel file. However, I get this error: UnicodeDecodeError: 'ascii' codec can't decode byte 0x92 in position 34: ordinal not in range(128) My question to you all is, how can I find exactly where that error is in my data set? Also, is there some code that I can write which will look through my data set and find out where the issues lie (because some data sets run without the above error and others have problems)?

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• Overriding the default error message for a ModelForm

  - by Jude Osborn

  Is there any way to override a error_message text for all the fields of a ModelForm's, without having to include all the field info in the ModelForm? For example, let's say I have a (very simple) model like this: People(models.Model): name = models.CharField(max_length=128, null=True, blank=True, help_text="Please type your name.") age = models.IntegerField(help_text="Please type your age.") I don't like the cut and dry default messages, such as, "Enter a whole number.", so I'd like to change them to something a bit nicer like "Please type a number." Ideally I'd be able to add an "error_message" property in the model, but the model does not support that property. So does that mean I have to basically duplicate all the model info in my ModelForm, or is there a way around that?

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• What is the most efficient way to encode an arbitrary GUID into readable ASCII (33-127)?

  - by mark

  Dear ladies and sirs. The standard string representation of GUID takes about 36 characters. Which is very nice, but also really wasteful. I am wondering, how to encode it in the shortest possible way using all the ASCII characters in the range 33-127. The naive implementation produces 22 characters, simply because 128 bits / 6 bits yields 22. Huffman encoding is my second best, the only question is how to choose the codes.... Any more ideas? Thanks. P.S. The encoding must be lossless, of course.

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• How to add a layer to a menuitem image

  - by alexander

  I have a menuitem with an image. I want to add half-transparent layer to that image. private void menuItem1_Paint(object sender, PaintEventArgs e) { using (SolidBrush brush = new SolidBrush(Color.FromArgb(128, SystemColors.ActiveCaption))) { e.Graphics.FillRectangle(brush, e.ClipRectangle); } } My problem is = I don't know clientrectangle of that image. e.ClipRectangle - it fills whole menuitem. I want to fill only image. How ? Is there another way, maybe ?

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• help me understand cuda

  - by scatman

  i am having some troubles understanding threads in NVIDIA gpu architecture with cuda. please could anybody clarify these info: an 8800 gpu has 16 SMs with 8 SPs each. so we have 128 SPs. i was viewing stanford's video presentation and it was saying that every SP is capable of running 96 threads cuncurrently. does this mean that it (SP) can run 96/32=3 warps concurrently? moreover, since every SP can run 96 threads and we have 8 SPs in every SM. does this mean that every SM can run 96*8=768 threads concurrently?? but if every SM can run a single Block at a time, and the maximum number of threads in a block is 512, so what is the purpose of running 768 threads concurrently and have a max of 512 threads? a more general question is:how are blocks,threads,and warps distributed to SMs and SPs? i read that every SM gets a single block to execute at a time and threads in a block is divided into warps (32 threads), and SPs execute warps.

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• Link a sequence with to an identity in hsqldb

  - by Candy Chiu

  In PostgreSql, one can define a sequence and use it as the primary key of a table. In HsqlDB, one can still accomplish creating an auto-increment identity column which doesn't link to any user defined sequence. Is it possible to use a user defined sequence as the generator of an auto-increment identity column in HsqlDB? Sample sql in PostgreSql: CREATE SEQUENCE seq_company_id START WITH 1; CREATE TABLE company ( id bigint PRIMARY KEY DEFAULT nextval('seq_company_id'), name varchar(128) NOT NULL CHECK (name < '') ); What's the equivalent in HsqlDB? Thanks.

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• Python: why does str() on some text from a UTF-8 file give a UnicodeDecodeError?

  - by AP257

  I'm processing a UTF-8 file in Python, and have used simplejson to load it into a dictionary. However, I'm getting a UnicodeDecodeError when I try to turn one of the dictionary values into a string: f = open('my_json.json', 'r') master_dictionary = json.load(f) #some json wrangling, then it fails on this line... mysql_string += " ('" + str(v_dict['code']) Traceback (most recent call last): File "my_file.py", line 25, in <module> str(v_dict['code']) + "'), " UnicodeEncodeError: 'ascii' codec can't encode character u'\xf4' in position 35: ordinal not in range(128) Why is Python even using ASCII? I thought it used UTF-8 by default, and this is a UTF-8 file. What is the problem?

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• Sun webstack vs Installing PHP, MySQL, Apache individually

  - by Vincent

  Is it possible to install PHP, MySQL, Apache individually on Solaris instead of installing them through a webstack? What are the advantages and disadvantages? I seem to frequently get a CURL error on Solaris when dealing with HTTPS sites. (error:81072080:lib(129):func(114):reason(128). I have no clue why that error is occuring and thought it might solve it, if I upgrade to latest PHP,MySQL,Apache versions. At this point I am not even sure if it's a Solaris issue. Any advice? Thanks

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• Has anyone ever had OpenCV work with Python 2.7 on MacOS 10.6?

  - by ?????

  I've been trying on and off for the past 6 months to get OpenCV to work with Python on MacOS. Every time there's a new release, I try again and fail. I've tried both 64-bit and 32-bit, and both the xcode gcc and gcc installed via macports. I just spend the past two days on it, hopeful that the latest OpenCV release, that appears to include Python support directly would work. It doesn't. I've also tried and failed to use this: http://code.google.com/p/pyopencv/ I've been using OpenCV with C++ or Microsoft C++/CLI for the past few years, but I'd love to use it with Python on a Mac because that is my primary development environment. I'd love to hear from anyone who's actually been able to get the opencv python examples to run under Mac OS 10.6, either 32 or 64-bit. My last attempt was to follow the instructions on this page http://recursive-design.com/blog/2010/12/14/face-detection-with-osx-and-python/ with a clean, fresh install of 10.6 on a 64-bit capable Mac. My PYTHONPATH is set, and I can see the cv library in it. But an "import cv" from python fails. Previously, the closest I've ever gotten (again, staring on a clean, fresh 10.6 install) was this: Python 2.7.1 (r271:86882M, Nov 30 2010, 10:35:34) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import cv Fatal Python error: Interpreter not initialized (version mismatch?) Abort trap thrilllap-2:~ swirsky$ I've seen a lot of folks answering similar questions here, but have never seen an definitive answer for it.

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• How to use a TFileStream to read 2D matrices into dynamic array?

  - by Robert Frank

  I need to read a large (2000x2000) matrix of binary data from a file into a dynamic array with Delphi 2010. I don't know the dimensions until run-time. I've never read raw data like this, and don't know IEEE so I'm posting this to see if I'm on track. I plan to use a TFileStream to read one row at a time. I need to be able to read as many of these formats as possible: 16-bit two's complement binary integer 32-bit two's complement binary integer 64-bit two's complement binary integer IEEE single precision floating-point For 32-bit two's complement, I'm thinking something like the code below. Changing to Int64 and Int16 should be straight forward. How can I read the IEEE? Am I on the right track? Any suggestions on this code, or how to elegantly extend it for all 4 data types above? Since my post-processing will be the same after reading this data, I guess I'll have to copy the matrix into a common format when done. I have no problem just having four procedures (one for each data type) like the one below, but perhaps there's an elegant way to use RTTI or buffers and then move()'s so that the same code works for all 4 datatypes? Thanks! type TRowData = array of Int32; procedure ReadMatrix; var Matrix: array of TRowData; NumberOfRows: Cardinal; NumberOfCols: Cardinal; CurRow: Integer; begin NumberOfRows := 20; // not known until run time NumberOfCols := 100; // not known until run time SetLength(Matrix, NumberOfRows); for CurRow := 0 to NumberOfRows do begin SetLength(Matrix[CurRow], NumberOfCols); FileStream.ReadBuffer(Matrix[CurRow], NumberOfCols * SizeOf(Int32)) ); end; end;

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• Socket receive buffer size

  - by Kanishka

  Is there a way to determine the receive buffer size of a TCPIP socket in c#. I am sending a message to a server and expecting a response where I am not sure of the receive buffer size. IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.125.125.226"),20060); Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); server.Connect(ipep); String OutStr= "49|50|48|48|224|48|129|1|0|0|128|0|0|0|0|0|4|0|0|32|49|50"; byte[] temp = OutStr.Split('|').Select(s => byte.Parse(s)).ToArray(); int byteCount = server.Send(temp); byte[] bytes = new byte[255]; int res=0; res = server.Receive(bytes); return Encoding.UTF8.GetString(bytes);

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• How i can do image CROP in OpenCV

  - by Nolik

  How i can do image crop such in PIL in OpenCV. Working example on PIL im = Image.open('0.png').convert('L') im = im.crop((1, 1, 98, 33)) im.save('_0.png') But how i can do it on OpenCV? I wanted to do so im = cv.imread('0.png', cv.CV_LOAD_IMAGE_GRAYSCALE) (thresh, im_bw) = cv.threshold(im, 128, 255, cv.THRESH_OTSU) im = cv.getRectSubPix(im_bw, (98, 33), (1, 1)) cv.imshow('Img', im) cv.waitKey(0) But it doesnt work. I think, i wrong use getRectSubPix. If it true, please explain how i can correctly use this function. Thanks.

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• Where can I find "reference barcodes" to verify barcode library output?

  - by mjustin

  This question is not about 'best' barcode library recommendation, we use various products on different platforms, and need a simple way to verify if a given barcode is correct (according to its specification). There are some free online bar code generators in the Internet, and I found many differences between their output and our library output regarding graphics and text field below the code. Now I am not sure which one is wrong, and before filing bug report I want to make sure how the correct barcode should look like. We mainly need Code128 and UCC/EAN-128 with A/B/C subcodes. Which resource would you suggest?

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• How to search for a string including spaces in Objective C?

  - by AlexCu

  I have a real basic command-line program, in Objective-C, that searches for user inputed information. Unfourtunately, the code will only read the first word in series of words that the user enters. For example, if the user enters in "Apples are great", only "Apples" is kept (and hence searched later on), excluding the "are great" part of the sentence. Here's what I have so far: char enteredQuery [128]; // array 'name' to hold the scanf string NSString *searchQuery; // ending NSString to hold and compare the user inputed data NSLog(@"Enter search query:"); scanf("%s", enteredQuery); //will read the next line searchQuery = [NSString stringWithCString: enteredQuery encoding: NSASCIIStringEncoding]; //converts scanf data into a NSString type I know it's got to do with me using scanf or the character-encoder conversion, but I can't seem to figure it out. Any help in solving the problem is very appreciated! Thanks.

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• mysql update too slow when joining multiple tables

  - by user293487

  Hi, I have two tables. they looks like as follows: Id (int) Tags char(128). the column Tags in table A does not have value. It is empty. The column Tags in table B has value. What I want to copy the Tags in table B to corresponding place of table A. the mapping is based on Id. My sql query is: update A INNER JOIN B set A.Tags = B.Tags where A.Id = B.Id There are about 2,000,000 rows in table A, and 50,000 rows in table B. The update seems very slow.... Could anyone tell me how to make it run faster?

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• Barcode field length

  - by bestattendance

  I'm writing some attendance software. Each member will have an ID card with a barcode which they will use to sign in to events. How long should the barcode field be in my database? I'd like to accept Code 39 and Code 128 barcodes. I know these are variable length codes, so what should I set the max length to? Thanks! EDIT: My clients will be using a variety of third-party barcode printing tools.

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• UUIDs in CouchDB

  - by PartlyCloudy

  I am wondering about the format UUIDs are by default represented in CouchDB. While the RFC 4122 describes UUIDs like 550e8400-e29b-11d4-a716-446655440000, CouchDB uses continuously chars like 3069197232055d39bc5bc39348a36417. I've searched some time in both their wiki and their documentation what this actually is, however without any result. Do you know whether this is either a non RFC-conform format omitting all - or is this a completely different representation of the 128 bits. The background is that I'm using Java UUIDs which are formatted as noted in the RFC. I see the advantage that the CouchDB-style is probably more handy for building internal trees, but I want to be sure to use a consistent implementation.

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• How to insert complex strings into Actionscript?

  - by Ole Jak

  How to insert complex strings into Actionscript? So I have a string -vvv -I rc w:// v dv s="60x40" --ut="#scode{vcode=FV1,acode=p3,ab=128,ch=2,rate=4400}:dup{dt=st{ac=http{mime=v/x-flv},mux=mpeg{v},dt=:80/sm.fv}}" How to insert it into code like public var SuperPuperComplexString:String = new String(); SuperPuperComplexString = TO_THAT_COMPLEX_STRING; That string has so many problems like some cart of it can happen to be like regexp BUTI DO NOT want it to be parsed as any kind of reg exp - I need It AS IT IS!) How to put that strange string into variable (put it not inputing it thru UI - hardcode it into AS code)?

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• UnicodeDecodeError from a GET-parameter in webapp2

  - by Aneon

  I'm getting a UnicodeDecodeError when recieving a GET-parameter from webapp2 that contains unicode characters, and then using it to do a NDB query. I get the same error message when manually running a unicode() on the parameter in the handler, so there either seems to be a problem in webapp2's URL routing or I've missed something. Preferably, all GET-parameters should be converted to unicode before getting passed into the handler so I don't need to do manual conversions in all of my handlers. I actually think it's worked before in an earlier version. The full error message read: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128) The GET-parameter contains the following string: göteborg. It looks fine when I raise an Exception on it, but gives me an error when I (or NDB) use unicode() on it. EDIT: In NDB, it fails on the following code: File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\datastore_types.py", line 1562, in PackString pbvalue.set_stringvalue(unicode(value).encode('utf-8')) Thanks.

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• Decoding international chars in AppEngine

  - by Irro

  I'm making a small project in Google AppEngine but I'm having problems with international chars. My program takes data from the user through the url "page.html?data1&data2..." and stores it for displaying later. But when the user are using some international characters like åäö it gets coded as %F4, %F5 and %F6. I assume it is because only the first 128(?) chars in ASCII table are allowed in http-requests. Is there anyone who has a good solution for this? Any simple way to decode the text? And is it better to decode it before I store the data or should I decode it when displaying it to the user.

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• How to get the string value of a UItextView?

  - by cocos2dbeginner

  Hi, I have a UITextView and a NString; I made this: myS = [myInfoTextView text]; but i get this in the console and not the string which is in the uitextview ( "<UIToolbarTextButton: 0x4d200c0; frame = (6 0; 112 44); opaque = NO; layer = <CALayer: 0x4da5540>>", "<UIToolbarTextButton: 0x4da5bb0; frame = (128 0; 106 44); opaque = NO; layer = <CALayer: 0x4d9e640>>" ) PS: I'm using the iphone sdk 4.2.

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• How to compile using gcc but without using _alloca ?

  - by shkim

  For some reason, I should use gcc to compile a C file, then link against Visual C++ 2008 project. (I used the current latest gcc version: cygwin gcc 4.3.4 20090804.) But there is one problem: gcc always allocate a big array with _alloca, and VC linker can't resolve the symbol __alloca. for example, int func() { int big[10240]; .... } this code makes the _alloca dependency although I didn't call the _alloca function explicitly. (array size matters. if i change 10240 - 128, everything ok) I tried gcc option -fno-builtin-alloca or -fno-builtin, but no luck. Is it possible to make gcc not to use _alloca ? (or adjust the threshold?)

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• How do I read UTF-8 characters via a pointer?

  - by Jen

  Suppose I have UTF-8 content stored in memory, how do I read the characters using a pointer? I presume I need to watch for the 8th bit indicating a multi-byte character, but how exactly do I turn the sequence into a valid Unicode character? Also, is wchar_t the proper type to store a single Unicode character? This is what I have in mind: wchar_t readNextChar (char** p) { char ch = *p++; if (ch & 128) { // This is a multi-byte character, what do I do now? // char chNext = *p++; // ... but how do I assemble the Unicode character? ... } ... }

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• Do I need to using locking against integers in c++ threads

  - by Shane MacLaughlin

  The title says it all really. If I am accessing a single integer type (e.g. long, int, bool, etc...) in multiple threads, do I need to use a synchronisation mechanism such as a mutex to lock them. My understanding is that as atomic types, I don't need to lock access to a single thread, but I see a lot of code out there that does use locking. Profiling such code shows that there is a significant performance hit for using locks, so I'd rather not. So if the item I'm accessing corresponds to a bus width integer (e.g. 4 bytes on a 32 bit processor) do I need to lock access to it when it is being used across multiple threads? Put another way, if thread A is writing to integer variable X at the same time as thread B is reading from the same variable, is it possible that thread B could end up a few bytes of the previous value mixed in with a few bytes of the value being written? Is this architecture dependent, e.g. ok for 4 byte integers on 32 bit systems but unsafe on 8 byte integers on 64 bit systems? Edit: Just saw this related post which helps a fair bit.

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• Replace special characters in python

  - by Marcos Placona

  Hi, I have some text coming from the web as such: £6.49 Obviously I would like this to be displayed as: £6.49 I have tried the following so far: s = url['title'] s = s.encode('utf8') s = s.replace(u'Â','') And a few variants on this (after finding it on this very same forum) But still no luck as I keep getting: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 100: ordinal not in range(128) Could anyone help me getting this right? UPDATE: Adding the reppr examples and content type u'Star Trek XI &#xA3;3.99' u'Oscar Winners Best Pictures Box Set \xc2\xa36.49' Content-Type: text/html; charset=utf-8 Thanks in advance

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