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• Design suggestions needed to create a MathBuilder framework

  - by Darf Zon

  Let explain what I'm trying to create. I'm creating a framework, the idea is to provide base classes to generate a math problem. Why do I need this framework? Because at first time, I realized when I create a new math problem I always do the same steps. Configuration settings such range numbers. For example if I'm developing multiplications, in beginner level only generate the first number between 2-5 or in advanced level, the first number will be between 6- 9, for example. Generate problem method. All the time I need to invoke a method like this to generate the problem. This one receives the configuration settings and generate the number according to them. And generate the object with the respective data. Validate the problem. Sometimes the problem generated is not valid. For example, supposed I'm creating fractions in most simplified, if I receive 2/4, the program should detect that this is not valid and must generate another like this one, 1/4. Load the view. All of them, have a custom view (please watch below the images). All of the problems must know how to CHECK if the user result is correct. All of this problems has answers. Some of them just require one answer, anothers may require more than one, so I guess a way to maintain flexibility to the developer has all the answers he wanna used. At the beginning I started using PRISM. Generate modules for each math problem was the idea and load it in the main system. I guess are the most important things of this idea. Let me showing some problems which I create in a WPF standalone program. Here I have a math problem about areas. When I generate the problem a set to the view the object and it draw it. In beginner level, I set in the configuration settings that just load square types. But in advance level, can load triangles and squares randomly. In this another, generate a binary problem like addition, subtraction, multiplication or division. Above just generate a single problem. The idea of this is to show a test o quiz, I mean get a worksheet (this I call as a collection of problems) where the user can answer it. I hope gets the idea with my ugly drawing. How to load this math problems? As I said above, I started using PRISM, and each module contains a math problem kind. This is a snapshot of my first demo. Below show the modules loaded, and center the respective configurations or levels. Until momment, I have no idea to start creating this software. I just know that I need a question | problem class, response class, user class. But I get lost about what properties should have to contain in it. Please give a little hand of this framework. I put much effort on this question, so if any isn't clear, let me know to clarify it.

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• How to deal with static utility classes when designing for testability

  - by Benedikt

  We are trying to design our system to be testable and in most parts developed using TDD. Currently we are trying to solve the following problem: In various places it is necessary for us to use static helper methods like ImageIO and URLEncoder (both standard Java API) and various other libraries that consist mostly of static methods (like the Apache Commons libraries). But it is extremely difficult to test those methods that use such static helper classes. I have several ideas for solving this problem: Use a mock framework that can mock static classes (like PowerMock). This may be the simplest solution but somehow feels like giving up. Create instantiable wrapper classes around all those static utilities so they can be injected into the classes that use them. This sounds like a relatively clean solution but I fear we'll end up creating an awful lot of those wrapper classes. Extract every call to these static helper classes into a function that can be overridden and test a subclass of the class I actually want to test. But I keep thinking that this just has to be a problem that many people have to face when doing TDD - so there must already be solutions for this problem. What is the best strategy to keep classes that use these static helpers testable?

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• Single click handler for all buttons in Javascript? Is it a pattern? Whats the benefit?

  - by Hasan Khan

  I have been told that when there are multiple buttons on the page for same purpose but targeting different item e.g. delete item on a grid of items, they say it is recommended to just register for click handler only on the top most element like 'body' and check what was clicked instead of hooking up click with every delete button. Whats the benefit of this? Creating more handlers causes problems? Is it an optimization of some sort? Is it a pattern? Does it have anything to do with performance? Where can I read more about it?

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• When is type testing OK?

  - by svidgen

  Assuming a language with some inherent type safety (e.g., not JavaScript): Given a method that accepts a SuperType, we know that in most cases wherein we might be tempted to perform type testing to pick an action: public void DoSomethingTo(SuperType o) { if (o isa SubTypeA) { o.doSomethingA() } else { o.doSomethingB(); } } We should usually, if not always, create a single, overridable method on the SuperType and do this: public void DoSomethingTo(SuperType o) { o.doSomething(); } ... wherein each subtype is given its own doSomething() implementation. The rest of our application can then be appropriately ignorant of whether any given SuperType is really a SubTypeA or a SubTypeB. Wonderful. But, we're still given is a-like operations in most, if not all, type-safe languages. And that seems suggests a potential need for explicit type testing. So, in what situations, if any, should we or must we perform explicit type testing? Forgive my absent mindedness or lack of creativity. I know I've done it before; but, it was honestly so long ago I can't remember if what I did was good! And in recent memory, I don't think I've encountered a need to test types outside my cowboy JavaScript.

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• how this scaling down for css code is worked?

  - by harris

  this is a code for scaling down for css. i was wondering, how this worked. please someone explain to me part by part. thank you very much. /* ======================================================================== / / Copyright (C) 2000 - 2009 ND-Tech. Co., Ltd. / / All Rights Reserved. / / ======================================================================== / / Project : ScaleDown Created : 31-AUG-2009 / / File : main.c Contact : [email protected] / / ======================================================================== / / You are free to use or modify this code to the following restrictions: / / Acknowledge ND Tech. Co. Ltd. / / Or, put "Parts of code by ND Tech. Co., Ltd." / / Or, leave this header as it is. / / in somewhere in your code. / / ======================================================================== */ include "vm3224k.h" define CE0CTL *(volatile int *)(0x01800008) define CE2CTL *(volatile int *)(0x01800010) define SDCTL *(volatile int *)(0x01800018) define LED *(volatile short *)(0x90080000) // Definitions for async access(change as you wish) define WSU (2<<28) // Write Setup : 0-15 define WST (8<<22) // Write Strobe: 0-63 define WHD (2<<20) // Write Hold : 0-3 define RSU (2<<16) // Read Setup : 0-15 define TA (3<<14) // Turn Around : 0-3 define RST (8<<8) // Read Strobe : 0-63 define RHD (2<<0) // Read Hold : 0-3 define MTYPE (2<<4) /* EDMA Registers */ define PaRAM_OPT 0 // Options define PaRAM_SRC 1 // Source Address define PaRAM_CNT 2 // Frame count, Element count define PaRAM_DST 3 // Destination Address define PaRAM_IDX 4 // Frame index, Element index define PaRAM_RDL 5 // Element count reload, Link address define EDMA_CIPR *(volatile int *)0x01A0FFE4 // EDMA Channel interrupt pending low register define EDMA_CIER *(volatile int *)0x01A0FFE8 // EDMA Channel interrupt enable low register define EDMA_CCER *(volatile int *)0x01A0FFEC // EDMA Channel chain enable register define EDMA_ER *(volatile int *)0x01A0FFF0 // EDMA Event low register define EDMA_EER *(volatile int *)0x01A0FFF4 // EDMA Event enable low register define EDMA_ECR *(volatile int *)0x01A0FFF8 // EDMA Event clear low register define EDMA_ESR *(volatile int *)0x01A0FFFC // EDMA Event set low register define PRI (2<<29) // 1:High priority, 2:Low priority define ESIZE (1<<27) // 0:32bit, 1:16bit, 2:8bit, 3:reserved define DS2 (0<<26) // 1:2-Dimensional define SUM (0<<24) // 0:no update, 1:increment, 2:decrement, 3:by index define DD2 (0<<23) // 1:2-Dimensional define DUM (0<<21) // 0:no update, 1:increment, 2:decrement, 3:by index define TCINT (1<<20) // 0:disable, 1:enable define TCC (8<<16) // 4 bit code define LINK (0<<1) // 0:disable, 1:enable define FS (1<<0) // 0:element, 1:frame define OptionField_0 (PRI|ESIZE|DS2|SUM|DD2|DUM|TCINT|TCC|LINK|FS) define DD2_1 (1<<23) // 1:2-Dimensional define DUM_1 (1<<21) // 0:no update, 1:increment, 2:decrement, 3:by index define TCC_1 (9<<16) // 4 bit code define OptionField_1 (PRI|ESIZE|DS2|SUM|DD2_1|DUM_1|TCINT|TCC_1|LINK|FS) define TCC_2 (10<<16)// 4 bit code define OptionField_2 (PRI|ESIZE|DS2|SUM|DD2|DUM|TCINT|TCC_2|LINK|FS) define DS2_3 (1<<26) // 1:2-Dimensional define SUM_3 (1<<24) // 0:no update, 1:increment, 2:decrement, 3:by index define TCC_3 (11<<16)// 4 bit code define OptionField_3 (PRI|ESIZE|DS2_3|SUM_3|DD2|DUM|TCINT|TCC_3|LINK|FS) pragma DATA_SECTION ( lcd,".sdram" ) pragma DATA_SECTION ( cam,".sdram" ) pragma DATA_SECTION ( rgb,".sdram" ) pragma DATA_SECTION ( u,".sdram" ) extern cregister volatile unsigned int IER; extern cregister volatile unsigned int CSR; short camcode = 0x08000; short lcdcode = 0x00000; short lcd[2][240][320]; short cam[2][240][320]; short rgb[64][32][32]; short bufsel; int *Cevent,*Levent,*CLink,flag=1; unsigned char v[240][160],out_y[120][160]; unsigned char y[240][320],out_u[120][80]; unsigned char u[240][160],out_v[120][80]; void PLL6713() { int i; // CPU Clock Input : 50MHz *(volatile int *)(0x01b7c100) = *(volatile int *)(0x01b7c100) & 0xfffffffe; for(i=0;i<4;i++); *(volatile int *)(0x01b7c100) = *(volatile int *)(0x01b7c100) | 0x08; *(volatile int *)(0x01b7c114) = 0x08001; // 50MHz/2 = 25MHz *(volatile int *)(0x01b7c110) = 0x0c; // 25MHz * 12 = 300MHz *(volatile int *)(0x01b7c118) = 0x08000; // SYSCLK1 = 300MHz/1 = 300MHz *(volatile int *)(0x01b7c11c) = 0x08001; // SYSCLK2 = 300MHz/2 = 150MHz // Peripheral Clock *(volatile int *)(0x01b7c120) = 0x08003; // SYSCLK3 = 300MHz/4 = 75MHz // SDRAM Clock for(i=0;i<4;i++); *(volatile int *)(0x01b7c100) = *(volatile int *)(0x01b7c100) & 0xfffffff7; for(i=0;i<4;i++); *(volatile int *)(0x01b7c100) = *(volatile int *)(0x01b7c100) | 0x01; } unsigned short ybr_565(short y,short u,short v) { int r,g,b; b = y + 1772*(u-128)/1000; if (b<0) b=0; if (b>255) b=255; g = y - (344*(u-128) + 714*(v-128))/1000; if (g<0) g=0; if (g>255) g=255; r = y + 1402*(v-128)/1000; if (r<0) r=0; if (r>255) r=255; return ((r&0x0f8)<<8)|((g&0x0fc)<<3)|((b&0x0f8)>>3); } void yuyv2yuv(char *yuyv,char *y,char *u,char *v) { int i,j,dy,dy1,dy2,s; for (j=s=dy=dy1=dy2=0;j<240;j++) { for (i=0;i<320;i+=2) { u[dy1++] = yuyv[s++]; y[dy++] = yuyv[s++]; v[dy2++] = yuyv[s++]; y[dy++] = yuyv[s++]; } } } interrupt void c_int06(void) { if(EDMA_CIPR&0x800){ EDMA_CIPR = 0xffff; bufsel=(++bufsel&0x01); Cevent[PaRAM_DST] = (int)cam[(bufsel+1)&0x01]; Levent[PaRAM_SRC] = (int)lcd[(bufsel+1)&0x01]; EDMA_ESR = 0x80; flag=1; } } void main() { int i,j,k,y0,y1,v0,u0; bufsel = 0; CSR &= (~0x1); PLL6713(); // Initialize C6713 PLL CE0CTL = 0xffffbf33;// SDRAM Space CE2CTL = (WSU|WST|WHD|RSU|RST|RHD|MTYPE); SDCTL = 0x57115000; vm3224init(); // Initialize vm3224k2 vm3224rate(1); // Set frame rate vm3224bl(15); // Set backlight VM3224CNTL = VM3224CNTL&0xffff | 0x2; // vm3224 interrupt enable for (k=0;k<64;k++) // Create RGB565 lookup table for (i=0;i<32;i++) for (j=0;j<32;j++) rgb[k][i][j] = ybr_565(k<<2,i<<3,j<<3); Cevent = (int *)(0x01a00000 + 24 * 7); Cevent[PaRAM_OPT] = OptionField_0; Cevent[PaRAM_SRC] = (int)&camcode; Cevent[PaRAM_CNT] = 1; Cevent[PaRAM_DST] = (int)&VM3224ADDH; Cevent = (int *)(0x01a00000 + 24 * 8); Cevent[PaRAM_OPT] = OptionField_1; Cevent[PaRAM_SRC] = (int)&VM3224DATA; Cevent[PaRAM_CNT] = (239<<16)|320; Cevent[PaRAM_DST] = (int)cam[bufsel]; Cevent[PaRAM_IDX] = 0; Levent = (int *)(0x01a00000 + 24 * 9); Levent[PaRAM_OPT] = OptionField_2; Levent[PaRAM_SRC] = (int)&lcdcode; Levent[PaRAM_CNT] = 1; Levent[PaRAM_DST] = (int)&VM3224ADDH; Levent = (int *)(0x01a00000 + 24 * 10); Levent[PaRAM_OPT] = OptionField_3; Levent[PaRAM_SRC] = (int)lcd[bufsel]; Levent[PaRAM_CNT] = (239<<16)|320; Levent[PaRAM_DST] = (int)&VM3224DATA; Levent[PaRAM_IDX] = 0; IER = IER | (1<<6)|3; CSR = CSR | 0x1; EDMA_CCER = (1<<8)|(1<<9)|(1<<10); EDMA_CIER = (1<<11); EDMA_CIPR = 0xffff; EDMA_ESR = 0x80; while (1) { if(flag) { // LED = 0; yuyv2yuv((char *)cam[bufsel],(char *)y,(char *)u,(char *)v); for(j=0;j<240;j++) for(i=0;i<320;i++) lcd[bufsel][j][i]=0; for(j=0;j<240;j+=2) for(i=0;i<320;i+=2) out_y[j>>1][i>>1]=(y[j][i]+y[j][i+1]+y[j+1][i]+y[j+1][i+1])>>2; for(j=0;j<240;j+=2) for(i=0;i<160;i+=2) { out_u[j>>1][i>>1]=(u[j][i]+u[j][i+1]+u[j+1][i]+u[j+1][i+1])>>2; out_v[j>>1][i>>1]=(v[j][i]+v[j][i+1]+v[j+1][i]+v[j+1][i+1])>>2; } for (j=0;j<120;j++) for (i=0;i<160;i+=2) { y0 = out_y[j][i]>>2; u0 = out_u[j][i>>1]>>3; v0 = out_v[j][i>>1]>>3; y1 = out_y[j][i+1]>>2; lcd[bufsel][j+60][i+80]=rgb[y0][u0][v0]; lcd[bufsel][j+60][i+81]=rgb[y1][u0][v0]; } flag=0; // LED = 1; } } }

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• what is a normal developer to pageview ratio?

  - by Anthony Shull

  I work for an e-commerce site that has lately been shedding its workforce. I was hired ten months ago as a UI Developer. At that time we had three other developers. One was the technical lead who had been with the company for 10 years. The other two were server-side developers who had been there for 10 and 3.5 years respectively. In ten months, the technical lead left for a better position, one developer was laid off, and the other very recently left. So, I am now the only developer on staff. We have one DBA and one network administrator. They are currently looking to hire another developer but are not willing to pay enough to hire a senior person. I consider myself a junior developer with two years of experience. I have argued that we need to hire at least one senior developer and another junior developer if we're going to keep our current site operational (not to mention develop new features)...even if that means laying off staff in other departments. Right now we get 6.5 million pageviews per month, and I feel like 3.2 million pageviews per developer must be incredibly abnormal. My question is then: what is a normal developer to pageview ratio? Are there any industry standards or literature on the subject that I can use to argue for more staff?

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• What is the best strategy for transforming unicode strings into filenames?

  - by David Cowden

  I have a bunch (thousands) of resources in an RDF/XML file. I am writing a certain subset of the resources to files -- one file for each, and I'm using the resource's title property as the file name. However, the titles are every day article, website, and blog post titles, so they contain characters unsafe for a URI (the necessary step for constructing a valid file path). I know of the Jersey UriBuilder but I can't quite get it to work for my needs as I detailed in a different question on SO. Some possibilities I have considered are: Since each resource should also have an associated URL, I could try to use the name of the file on the server. The down side of this is sometimes people don't name their content logically and I think the title of an article better reflects the content that will be in each text file. Construct a white list of valid characters and parse the string myself defining substitutions for unsafe characters. The downside of this is the result could be just as unreadable as the former solution because presumably the content creators went through a similar process when placing the files on their server. Choose a more generic naming scheme, place the title in the text file along with the other attributes, and tell my boss to live with it. So my question here is, what methods work well for dealing with a scenario where you need to construct file names out of strings with potentially unsafe characters? Is there a solution that better fills out my constraints?

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• Version Control without CVS

  - by Lo Wai Lun

  My partners and I have been building an application that requires users to authenticate with password and user ID for member registration and transaction. Very often, tasks for designing UI, Datagrid view event trigger and data access using SQL are allocated to different person. Sometimes, there are different versions to be updated but the database structure used are different If everybody finishes their own part and submit the project on their own onto the shared cloud rivers, there must be a huge cost for software maintenance and re-engineering. How should the task to be submitted so as to minimize the cost for re-engineering without the software like winCVS and Tortoise HG?

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• What format have project managers used for defining features/requirements? [on hold]

  - by Jon

  At the company that I currently work at, Word documents are passed around which contain the features/requirements for the software we write, and those Word docs contain mock-ups (there aren't any use cases that I've seen). I'm just curious what project managers use at other companies. Do some skip making the requirements documents altogether and go straight for a ticket-tracker such as JIRA? What seems to work the best? Thanks, -Jon

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• What do you do to get your software design robust, flexible and clear?

  - by Oscar

  I am still getting mature as a software engineering/designer/architect, as you may want to call. At this point in time, I am getting small projects, private projects and so on. What I noticed is that even though I think about the SW structure, design some diagrams, have they really clear in my mind when I start coding, at the end, my software is not flexible and clear as I would like to. I would like to ask you what kind of approaches, mechanisms or even tricks do you use, to get your software (and SW design) flexible, robust and clear (easy to understand and use). So.... Any ideas to give to a beginner?

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• Zend Framwork scaffolding capabilities

  - by rockstarz

  Are there any open source projects any of you would recommend to follow or contribute toward, including those already documented among the zf contributors, to add zend framework scaffolding of crud functionality for rapid development as found in many competitors frameworks (Yii, Symfony, Rails, Django, etc.)? As a user of zf on a daily basis on enterprise implementations, I know this is a topic of interest and I feel professional developers like you would find here would have something to contribute toward my question and finding a library that is underway that can be contributed to.

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• How should I manage "reverting" a branch done with bookmarks in mercurial?

  - by Earlz

  I have an open source project on bitbucket. Recently, I've been working on an experimental branch which I (for whatever reason) didn't make an actual branch for. Instead what I did was use bookmarks. So I made two bookmarks at the same revision test --the new code I worked on that should now be abandoned(due to an experiment failure) main -- the stable old code that works I worked in test. I also pushed from test to my server, which ended up switching the tip tag to the new unstable code, when I really would've rather it stayed at main. I "switched" back to the main bookmark by doing a hg update main and then committing an insignificant change. So, I pushed this with hg push -f and now my source control is "correct" on the server. I know that there should be a cleaner way to "switch" branches. What should I do in the future for this kind of operation?

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• storing map template in database

  - by Timigen

  I am working on an application that displays choropleth maps. These maps are of all different types, some display state by county, country by state/province, or world by country. How should I handle storing the map information in the database? My Thoughts: I won't need to do queries to find POI inside a region, so I don't think there is a need to use spatial datatypes. I am considering storing a map as a geoJSON object (I am using JS mapping library that accepts geoJSON). The only issue is what if I want a map of the US northeast. Then I would have geoJSON for the US and a separate one for the US northeast, which would be redundant. Would it make sense to have a shape database where I had each state then when I needed a map of the US I could query for each state, and when I needed a map of the US Northeast I could again query for what I need? Note: I am not concerned with storing the data for each region, just the region itself. I will query for the data on the fly for the specific region.

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• Is it bad to join open-source projects as an amateur?

  - by esqew

  I've thought for about six months now that I should join an open-source iPhone or iPad project to hone my skills in Objective-C, but every time I go to do it I see thousands of lines of code on huge projects that I end up convincing myself I would never understand. I always think that my commits would just end up being a hassle for project admins and more senior contributors, so I always back out at the last second. My question essentially is, is it a hassle when an intermediately-experienced programmer joins an open-source project?

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• What are the pros (and cons) of using “Sign in with Twitter/Facebook” for a new website?

  - by Paul D. Waite

  Myself and a friend are looking to launch a little forum site. I’m considering using the “Sign in with Facebook/Twitter” APIs, possibly exclusively (a la e.g. Lanyrd), for user login. I haven’t used either of these before, nor run a site with user logins at all. What are the pros (and cons) of these APIs? Specifically: What benefits do I get as a developer from using them? What drawbacks are there? Do end users actually like/dislike them? Have you experienced any technical/logistical issues with these APIs specifically? Here are the pros and cons I’ve got so far: Pros More convenient for the user (“register” with two clicks, sign in with one) Possibly no need to maintain our own login system  Cons No control over our login process Exclude Facebook/Twitter users who are worried about us having some sort of access to their accounts Users’ accounts on our site are compromised if their Facebook/Twitter accounts are compromised. And if we don’t maintain our own alternative login system: Dependency on Facebook/Twitter for our login system Exclude non-Facebook/non-Twitter users from our site

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• Why is HTML/Javascript minification beneficial

  - by Channel72

  Why is HTML/Javascript minification beneficial when the HTTP protocol already supports gzip data compression? I realize that Javascript/HTML minification has the potential to significantly reduce the size of Javascript/HTML files by removing unnecessary whitespace, and perhaps renaming variables to a few letters each, but doesn't the LZW algorithm do especially well when there are many repeated characters (e.g. lots of whitespace?) I realize that some Javascript minification tools do more than just reduce size. Google's closure compiler, for example, also tries to improve code performance by inlining functions and doing other analyses. But the primary purpose of Javascript minification is usually to reduce file size. I also realize there are other reasons you might want to minify aside from performace, such as code obfuscation. But again, that reason is not usually emphasized as much as performance gain and file size reduction. For example, Closure Compiler is not advertised as an obfuscation tool, but as a code size reducer and download-speed enhancer. So, how much performance do you really gain from Javascript/HTML minification when you're already significantly reducing file size with gzip compression?

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• EnOcean -> USB Serial Communication (C++)

  - by regorianer

  I guess it is not the right place to ask here for enocean specific details, but maybe I am doing something wrong by using serial connections and you can help me no matter if there is knowledge about this technology or not. I have a problem to communicate with the RCM152 Module. I have written a C++ program to communicate with the RCM152 by emulating packets of the PTM 200. I teach the RCM152 to listen to the following packets: [06/19/12 04:21:44.546] INFO: SENDING BYTE : 55 <-- start byte [06/19/12 04:21:44.546] INFO: SENDING BYTE : 00 <-- head begin [06/19/12 04:21:44.546] INFO: SENDING BYTE : 07 [06/19/12 04:21:44.546] INFO: SENDING BYTE : 07 [06/19/12 04:21:44.546] INFO: SENDING BYTE : 01 <-- head end [06/19/12 04:21:44.546] INFO: SENDING BYTE : 7a <-- CRC Check [06/19/12 04:21:44.546] INFO: SENDING BYTE : f6 <-- packet type [06/19/12 04:21:44.546] INFO: SENDING BYTE : 20 <-- My action (00 and 10 -> OFF, 20 and 30 -> ON) [06/19/12 04:21:44.546] INFO: SENDING BYTE : 00 <-- serial.byte 3 [06/19/12 04:21:44.546] INFO: SENDING BYTE : 24 <-- serial.byte 2 [06/19/12 04:21:44.546] INFO: SENDING BYTE : 21 <-- serial.byte 1 [06/19/12 04:21:44.546] INFO: SENDING BYTE : 87 <-- serial.byte 0 [06/19/12 04:21:44.546] INFO: SENDING BYTE : 30 <-- status [06/19/12 04:21:44.546] INFO: SENDING BYTE : 03 <-- 03 for send, 01 for receiver [06/19/12 04:21:44.546] INFO: SENDING BYTE : ff <-- begin destination [06/19/12 04:21:44.546] INFO: SENDING BYTE : ff [06/19/12 04:21:44.546] INFO: SENDING BYTE : ff [06/19/12 04:21:44.546] INFO: SENDING BYTE : ff <-- end destination [06/19/12 04:21:44.546] INFO: SENDING BYTE : ff <-- Transmission quality (sender ff) [06/19/12 04:21:44.546] INFO: SENDING BYTE : 00 [06/19/12 04:21:44.547] INFO: SENDING BYTE : 10 <-- CRC Check A PTM200 Device or a SG-FUS-24-230 Device are sending equivalent packets like: [06/19/12 04:30:31.106] INFO: Received Byte: 55 [06/19/12 04:30:31.106] INFO: Received Byte: 00 [06/19/12 04:30:31.106] INFO: Received Byte: 07 [06/19/12 04:30:31.106] INFO: Received Byte: 07 [06/19/12 04:30:31.106] INFO: Received Byte: 01 [06/19/12 04:30:31.106] INFO: Received Byte: 7a [06/19/12 04:30:31.106] INFO: Received Byte: f6 [06/19/12 04:30:31.106] INFO: Received Byte: 40 [06/19/12 04:30:31.106] INFO: Received Byte: 00 [06/19/12 04:30:31.106] INFO: Received Byte: 24 [06/19/12 04:30:31.106] INFO: Received Byte: 6c [06/19/12 04:30:31.106] INFO: Received Byte: 2f [06/19/12 04:30:31.106] INFO: Received Byte: 30 [06/19/12 04:30:31.106] INFO: Received Byte: 01 [06/19/12 04:30:31.106] INFO: Received Byte: ff [06/19/12 04:30:31.106] INFO: Received Byte: ff [06/19/12 04:30:31.108] INFO: Received Byte: ff [06/19/12 04:30:31.108] INFO: Received Byte: ff [06/19/12 04:30:31.108] INFO: Received Byte: 37 [06/19/12 04:30:31.108] INFO: Received Byte: 00 [06/19/12 04:30:31.108] INFO: Received Byte: d1 I can control the device connected to the RCM152 like I want to with my sending packets (thats a good fact and means that the RCM152 has learned my packets and can use them. Also the actions (0x10 - ON, 0x30 - OFF) are working fine), but the problem is, that no matter which serial I choose, the RCM152 reacts to these packets. I only want to have actions if the teached-in serial is send and all other packets with different serials to be ignored. The RCM152 is not reacting to the packets sent by the PTM200 nor by the SG-FUS-24-230 because these are not teached-in. Thats exactly what I want to have with the packets created myself. What am I doing wrong? The libraries I am using are these for C++ http://pvbrowser.de/pvbrowser/sf/manual/rllib/html/ The enocean EEP says: For this purpose of a determined relationship between transmitter and receiver each transmitting device has a unique Sender-ID which is part of each radio telegram. The receiving device detects from the Sender-ID whether the device is known, i.e., was already learned, or unknown. A telegram with unknown Sender-ID is disregarded.

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• How does a website latency simulator work

  - by nighthawk457

  Sites like webpagetest allow users to enter a website url and a test location, to run a speed test on the site from multiple locations using real browsers. Can anyone give me a basic idea of how sites like this work? You also have plugin's like Aptimize latency simulator or charles web debugging proxy app, that simulate the delay while accessing a site from different locations. I am assuming since these are plugin's these function in a different way. How do these plugin's work ?

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• What are the most important OO skills to show off in the job hunt?

  - by Kat

  I am in the market for new employment, and found a position were they asked me to create a programming sample based off an assignment. I blew the sample trying to get it done quickly one night, and got declined - only to be given a second chance recently. The concern was that I didn't really demonstrate object oriented knowledge. I've rethought my approach but I figure it's worth asking: if you were hiring someone for an OO position, what skills would you most want to see them demonstrate they had a firm grasp on? I want to be sure that I'm missing anything important this time around.

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• what are the benefits of closure, primarily for PHP?

  - by Patrick

  I am beginning the process of moving code over to PHP 5.3 and one of the most highly touted features of PHP 5.3 is the ability to use closures. My understanding of closures is that they allow anonymous functions, can be assigned to variable names, and have interesting scoping abilities. From my point of view the only seeming benefits in real world applications is the reduction of clutter in the namespace because closures are anonymous. Am I wrong in this? Should I be trying to put closures wherever I code? EDIT: I have already read this post on Javascript closures.

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• What should you leave behind for your successors?

  - by SnOrfus

  Assume that you're a sole developer leaving a job. What kind of information/material, outside of the code itself, should you create and leave behind for your replacement? An obvious answer is "whatever you would want at a new job" for sure, but it's been a while since I started a new job, and I forget what the most important things that I needed were back then. I'm thinking: accounts/passwords location of equpiment What else?

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• Django as Python extension?

  - by NoobDev4iPhone

  I come from php community and just started learning Python. I have to create server-side scripts that manipulate databases, files, and send emails. Some of it I found hard to do in python, comparing to php, like sending emails and querying databases. Where in php you have functions like mysql_query(), or email(), in python you have to write whole bunch of code. Recently I found Django, and my question is: is it a good framework for network-oriented scripts, instead of using it as a web-framework?

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• What do you think are the biggest software development issues, in small to medium businesses?

  - by Ron-Damon

  Hi, I own a small software development company that developes Web software to other small and medium companies in Chile. The business process is very complex and it is hard to stablish where to put the efforts to make our company better, more efficient, and give better solutions. I'm also a TI master's degree student and i'm making a paper about this subject, so any help would be great to help my company and my paper. I have considered 3 areas for the problems: 1) Software development problems 2) Web development problems 3) Small and Medium companies problems I don't know about you, but at least this "business formula" in Chile has not received very much support but it is getting better, but today my company is far from being self-sufficient. UPDATE: Thanks guys for your support so far, i'm updating because i have somewhat enough information so i decided to go deeper within the subjects, wish i would like you to consider for your next answers/commentaries on the subject: 1) Software development problems (3) 1.1 Incomplete problem picture 1.2 Useless delivered software 1.3 Unrealistic or inadequate schedule 2) Web development problems (3) 2.1 Apparently non-viable implementation 2.2 Unefficient module construction design 2.3 Reduced result system inter-operability 3) Small and Medium companies problems (3) 3.1 Very specific, but narrowed requerired system characteristics 3.2 Developed system is not used 3.3 Positivist demand for activities in project execution There are only 3 problems for category, to deliberately keep a thiner scope. Also, i have considered that it would have been apropiated to separate the third clasification on two, but won't be doing it just now: 3) Small and Medium software developement providers problems 4) Small and Medium software developement clients problems In that case, i think i would have made the scope of the problem wider and it is not what i want to do now, until at least i'm very trough with the other two clasifications. What you think?

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• How does whitespace affect Python code?

  - by Codereview

  I've started programming about a year ago, I've learned the C and C++ languages and bits of Java. Recently I've started to learn the Python language (Notable: I'm using the Eclipse IDE). I'm used to formatting my code with whitespace, placing statements a bit to the right of my code for easier readability. Since I started working with Python it seems whitespace is a problem, I get some unnecessary whitespace warnings, and my code gets underlined (In eclipse). After a while I figured Python is very restrictive about whitespace for some reason, so I've been looking for the effects of whitespace on Python code. How does it affect the code? Does the code work different with unnecessary whitespace?

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• Programmer performance

  - by RSK

  I am a PHP programmer with 1 year of experience. As I am just starting my career, I am learning a lot of things now. I can say I am a little bit of a perfectionist. When I am assigned a problem I start off by Googling. Then, even when I find a solution, I keep trying for a better one until I find 2-3 options. Then I start learning it and choose the best performing solution. Even though I am learning a lot, this process gets me labeled as a low performer. My questions: As a novice, should I continue to use this learning process and not worry about my performance? Should I focus more on my performance and less on how the code performs?

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