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  • Simple number-to-number (or number-to-hex) encryption algorithm that minimizes # of characters

    - by Clay Nichols
    I need to encrypt a number and I and this encrypted value will be given to a customer ask a key so I want to minimize the number of digits and make them all printable. So I'd like the result to be either all number or all Hex characters. The current encryption method I'm using (for non numbers) converts the characters to hex (2 hex digits each). That doubles the number of characters. I also considered just treating the input as hex (so each pair of numbers is treated as a Hex pair, but then you have ambiguity between an input of 0123 and 123 (when decrypting that leading '0' is lost. Any suggestions?

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  • BuiltIn Function to Convert from Hex String to Byte

    - by Ngu Soon Hui
    This question is similar to the one here. One can easily convert from hex string to byte via the following formula: public static byte[] HexStringToBytes(string hex) { byte[] data = new byte[hex.Length /2]; int j = 0; for (int i = 0; i < hex.Length; i+=2) { data[ j ] = Convert.ToByte(hex.Substring(i, 2), 16); ++j; } return data; } But is there a built-in function ( inside .net framework) for this?

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  • Strange hex formatting in NSString

    - by pseudopeach
    Try this: unsigned long long int N; = 23229877463LL; NSString* s = [NSString stringWithFormat:@"dec:%qi, hex:%qX",N,N]; NSLog(@"output: %@",s); output: dec:23229877460, hex:689BCCD400000005 What's up with the 00000005??? In mySQL, hex(23229877460) = 5689BCCD4. Also, every other language seems to do this correctly. A 16 digit long hex is like 4 gazillion (16^16), right? How can I get objective-c to format hex numbers that other languages can understand?

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  • How to get the MD5 hex hash for a file using VBA?

    - by aF
    How can I get the MD5 hex hash for a file using VBA? I need a version that works for a file. Something as simple as this Python code: import hashlib def md5_for_file(fileLocation, block_size=2**20): f = open(fileLocation) md5 = hashlib.md5() while True: data = f.read(block_size) if not data: break md5.update(data) f.close() return md5.hexdigest() But in VBA.

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  • How to convert an ASCII HEX character to it's value (0-15)?

    - by philcolbourn
    I am writing a string parser and the thought occurred to me that there might be some really interesting ways to convert an ASCII hexadecimal character [0-9A-Fa-f] to it's numeric value. What are the quickest, shortest, most elegant or most obscure ways to convert [0-9A-Fa-f] to it's value between 0 and 15? Assume, if you like, that the character is a valid hex character. I have no chance so I'll have a go at the most boring. ( c <= '9' ) ? ( c - '0' ) : ( (c | '\x60') - 'a' + 10 )

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  • Hex characters in varchar() is actually ascii. Need to decode it.

    - by csauve
    This is such an edge-case of a question, I'd be surprised if there is an easy way to do this. I have a MS SQL DB with a field of type varchar(255). It contains a hex string which is actually a Guid when you decode it using an ascii decoder. I know that sounds REALLY weird but here's an example: The contents of the field: "38353334373838622D393030302D343732392D383436622D383161336634396339663931" What it actually represents: "8534788b-9000-4729-846b-81a3f49c9f91" I need a way to decode this, and just change the contents of the field to the actual guid it represents. I need to do this in T-SQL, I cannot use .Net (which if I could, that is remarkably simple).

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  • Getting value of LSB from Hex (C code)

    - by Rjff
    Hi - first post here :) I've got a code like this in C: unsigned char const data[ ] = {0x0a, 0x1d, 0xf0, 0x07}; I need to extract it such that the final value is: 0xa1df7 I have only been able to extract and get it working if the hex values that have at least 1 zero: unsigned char const data[ ] = {0x0a, 0xd0, 0xf0, 0x07}; using the code below: for(int i = 0; i < SIZE; ++i) { tmp = data[i]; if ( (data[i] <= 0x0F) && (((data[i] & 0x0F) == 0) || (data[i] & 0xF0) == 0)) // one of the hex is zero { tmp = ((tmp << 4) >> 4) << N[i]; std::cout << "foo: " << std::hex << tmp << ":" << std::endl; } else if ((data[i] >= 0x0F) && (((data[i] & 0x0F) == 0) || (data[i] & 0xF0) == 0) ) { tmp = (tmp >> 4) << N[i]; std::cout << "bar: " << std::hex << tmp << ":" << std::endl; } else { std::cout << "result: " << std::hex << result << ":" << std::endl; std::cout << "tmp << 8: " << std::hex << (tmp << 8)<< ":" << std::endl; result = result | (tmp << 8); std::cout << "result |= (tmp << 8): " << std::hex << result << ":" << std::endl; } result |= tmp; std::cout << "boo: " << std::hex << result << ":" << std::endl; } It seems the last else {...} block is troublesome for me. Any ideas? Thanks!

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  • URL hex characters in .htaccess

    - by Steve
    There is an old page with a space in the filename, and this is no longer found on the website. So I need to redirect this page to another page using a 301 redirect in .htaccess. If I place the filename directly into .htaccess (Bouquets%20%26%20Loose.html), the redirect does not work. If I escape the % sign like this (Bouquets\%20\%26\%20Loose.html), the redirect still does not work. How do I get this redirect to work in .htaccess? Thanks.

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  • convert float numbers to hex

    - by jordan2010
    I am quite new in Python and I am looking for converting numbers from decimal to hex How to convert float numbers to hex or char in Python 2.4.3? how can I keep it to write it as ("\xa5\x (here the new hex number)") any help Thanks,

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  • invalid scalar hex value 0x8000000 and over

    - by kioto
    Hi. I found a problem getting hex value from yaml file. It couldn't get hex value 0x80000000 and over. Following is a sample C++ program. // ymlparser.cpp #include <iostream> #include <fstream> #include "yaml-cpp/yaml.h" int main(void) { try { std::ifstream fin("hex.yaml"); YAML::Parser parser(fin); YAML::Node doc; parser.GetNextDocument(doc); int num1; doc["hex1"] >> num1; printf("num1 = 0x%x\n", num1); int num2; doc["hex2"] >> num2; printf("num2 = 0x%x\n", num2); return 0; } catch(YAML::ParserException& e) { std::cout << e.what() << "\n"; } } hex.yaml hex1: 0x7FFFFFFF hex2: 0x80000000 Error message is here. $ ./ymlparser num1 = 0x7fffffff terminate called after throwing an instance of 'YAML::InvalidScalar' what(): yaml-cpp: error at line 2, column 7: invalid scalar Aborted Environment yaml-cpp : getting from svn, March.22.2010 or v0.2.5 OS : Ubuntu 9.10 i386 I need to get hex the value on yaml-cpp now, but I have no idea. Please tell me how to get it another way. Thanks,

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  • Compute hex color code for an arbitrary string

    - by user222164
    Heading Is there a way to map an arbitrary string to a HEX COLOR code. I tried to compute the HEX number for string using string hashcode. Now I need to convert this hex number to six digits which are in HEX color code range. Any suggestions ? String [] programs = {"XYZ", "TEST1", "TEST2", "TEST3", "SDFSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS"}; for(int i = 0; i < programs.length; i++) { System.out.println( programs[i] + " -- " + Integer.toHexString(programs[i].hashCode())); }

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  • Does my use of the strategy pattern violate the fundamental MVC pattern in iOS?

    - by Goodsquirrel
    I'm about to use the 'strategy' pattern in my iOS app, but feel like my approach violates the somehow fundamental MVC pattern. My app is displaying visual "stories", and a Story consists (i.e. has @properties) of one Photo and one or more VisualEvent objects to represent e.g. animated circles or moving arrows on the photo. Each VisualEvent object therefore has a eventType @property, that might be e.g. kEventTypeCircle or kEventTypeArrow. All events have things in common, like a startTime @property, but differ in the way they are being drawn on the StoryPlayerView. Currently I'm trying to follow the MVC pattern and have a StoryPlayer object (my controller) that knows about both the model objects (like Story and all kinds of visual events) and the view object StoryPlayerView. To chose the right drawing code for each of the different visual event types, my StoryPlayer is using a switch statement. @implementation StoryPlayer // (...) - (void)showVisualEvent:(VisualEvent *)event onStoryPlayerView:storyPlayerView { switch (event.eventType) { case kEventTypeCircle: [self showCircleEvent:event onStoryPlayerView:storyPlayerView]; break; case kEventTypeArrow: [self showArrowDrawingEvent:event onStoryPlayerView:storyPlayerView]; break; // (...) } But switch statements for type checking are bad design, aren't they? According to Uncle Bob they lead to tight coupling and can and should almost always be replaced by polymorphism. Having read about the "Strategy"-Pattern in Head First Design Patterns, I felt this was a great way to get rid of my switch statement. So I changed the design like this: All specialized visual event types are now subclasses of an abstract VisualEvent class that has a showOnStoryPlayerView: method. @interface VisualEvent : NSObject - (void)showOnStoryPlayerView:(StoryPlayerView *)storyPlayerView; // abstract Each and every concrete subclass implements a concrete specialized version of this drawing behavior method. @implementation CircleVisualEvent - (void)showOnStoryPlayerView:(StoryPlayerView *)storyPlayerView { [storyPlayerView drawCircleAtPoint:self.position color:self.color lineWidth:self.lineWidth radius:self.radius]; } The StoryPlayer now simply calls the same method on all types of events. @implementation StoryPlayer - (void)showVisualEvent:(VisualEvent *)event onStoryPlayerView:storyPlayerView { [event showOnStoryPlayerView:storyPlayerView]; } The result seems to be great: I got rid of the switch statement, and if I ever have to add new types of VisualEvents in the future, I simply create new subclasses of VisualEvent. And I won't have to change anything in StoryPlayer. But of cause this approach violates the MVC pattern since now my model has to know about and depend on my view! Now my controller talks to my model and my model talks to the view calling methods on StoryPlayerView like drawCircleAtPoint:color:lineWidth:radius:. But this kind of calls should be controller code not model code, right?? Seems to me like I made things worse. I'm confused! Am I completely missing the point of the strategy pattern? Is there a better way to get rid of the switch statement without breaking model-view separation?

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  • Can I do filename pattern matching in a bash script?

    - by Bob Bowden
    Can I do filename pattern matching in a bash script? "test" is a directory with the following files ... bob@bob-laptop:~/test$ ls exclude exclude1 exclude2 include1 include2 from the command line, if I want to exclude some of the files, I can do ... bob@bob-laptop:~/test$ echo !(exclude*) include1 include2 but, if I put that command in a script (named exclude) ... bob@bob-laptop:~/test$ cat exclude echo !(exclude*) when I execute it, I get an error ... bob@bob-laptop:~/test$ ./exclude ./exclude: line 1: syntax error near unexpected token (' ./exclude: line 1:echo !(exclude*)' I've tried every (I think) variation of escaping some, all or none of the special characters and I still get an error. What am I missing here? If I can't do this, would someone please be so kind as to explain why?

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  • Hex colors: Numeric representation for "transparent"?

    - by Pekka
    I am building a web CMS in which the user can choose colours for certain site elements. I would like to convert all colour values to hex to avoid any further formatting hassle ("rgb(x,y,z)" or named colours). I have found a good JS library for that. The only thing that I can't get into hex is "transparent". I need this when explicitly declaring an element as transparent, which in my experience can be different from not defining any value at all. Does anybody know whether this can be turned into some numeric form? Will I have to set up all processing instances to accept hex values or "transparent"? I can't think of any other way.

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  • Plot hex tiles with different length sides?

    - by Phil
    I'm trying to create a basic grid of hex tiles. I found some code... s=h/Math.cos(30*Math.PI/180)/2; tile._x=x*s*1.5; tile._y=y*h+(x%2)*h/2; That does just that, but I think it's setup for hex's that have same length sides. However my hex has different length sides. It's width is 140 and it's height is 80. I could completely change the code to work with my side lengths, but I was wondering if there's a better way of doing it with the code above.

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  • View numeric columns in hex - SQL Server Management Studio

    - by Jonathan
    In SQL Server Management Studio, when I run a query which outputs a numeric column (int or similar types), they are displayed in decimal (example: 193). I want them to display in hex (example: 0xC1). How do I do that? I found many answers on how to write converter functions, but I don't want that - only change the display in SSMS. I only found this unanswered question. I use SQL2010, though may move to SQL2012 soon.

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  • Details in hex of the certificate in .pem openssl

    - by allenzzzxd
    Hi, I have generated using openssl mycert.pem which contents the certificate. And I converted the base64 text into hex. I wonder if it's possible to extract the informations from the hex string in c (without using the openssl library). For example, the public key, the issuer, the subject, the validity information, etc. Thanks.

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  • Deploy binary hex registry via GPO or PowerShell

    - by Prashanth Sundaram
    I am trying to deploy a custom registry entry which I exported from a test machine. It looks like below. I came across THIS similar request on another site, but I couldn't make it to work. "TextFontSimple"=hex:3c,00,00,00,1f,00,00,f8,00,00,00,40,dc,00,00,00,00,00,00,\ 00,00,00,00,ff,00,31,43,6f,75,72,69,65,72,20,4e,65,77,00,00,00,00,00,00,00,\ 00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00 As per the other solution, my PS command below, throws error."A parameter cannot be found that matches parameter name" Set-ItemProperty -Path "HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\MailSettings" -Name "TextFontSimple" -PropertyType Binary -Value ([byte[]] (0x3c,0x00,0x00,0x00,0x1f....0x00)) Any ideas? ====EDIT===== The key & value already exists. When I use Get-ItemProperty PSPath : Microsoft.PowerShell.Core\Registry::HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\MailSettings PSParentPath : Microsoft.PowerShell.Core\Registry::HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common PSChildName : MailSettings PSProvider : Microsoft.PowerShell.Core\Registry TextFontSimple : {60, 0, 0, 0...}

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  • How to input 64-bit hex values in octave

    - by Chris Ashton
    I'm trying to use Octave as a programmer's calculator. I want to input a 64-bit pointer, but when I do apparently the 64-bit value gets silently truncated to 32-bit: octave:44> base_ptr=0x1010101020202020 base_ptr = 538976288 octave:45> uint64(base_ptr) ans = 538976288 octave:46> printf("%lx\n", base_ptr) 20202020 So it seems like it's truncated the input value to the low 32-bits. I would use scanf, but the docs say it should only be used internally. How can I input the full 64-bit value? Alternately, is there some awesome free programmer's calculator out there for Windows? (I know Windows calculator has a programmer's mode but I would like arbitrary variable support). I tried using my ti-89 but it also doesn't support 64-bit hex.

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  • iptables drop packet by hex string match

    - by Flint
    I got this packet captured with tcpdump but I'm not sure how to use the --hex-string param to match the packet. Can someone show me how to do it? 11:18:26.614537 IP (tos 0x0, ttl 17, id 19245, offset 0, flags [DF], proto UDP (17), length 37) x.x.187.207.1234 > x.x.152.202.6543: [no cksum] UDP, length 9 0x0000: f46d 0425 b202 000a b853 22cc 0800 4500 .m.%.....S"...E. 0x0010: 0025 4b2d 4000 1111 0442 5ebe bbcf 6701 .%[email protected]^...g. 0x0020: 98ca 697d 6989 0011 0000 ffff ffff 5630 ..i}i.........V0 0x0030: 3230 3300 0000 0000 0000 0000 203.........

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