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  • Printing values of all fields in C++ structure

    - by Zhinkaas
    Say a simple structure struct abc { int a; char b; } I got some value in a variable defined as its structure and now I want to print below a = [some value] b = [some character] What is the best way to achieve this for an arbitrary structure without having to write a dump...(...) function for each of the structure I encounter?

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  • Exercise 7.9 in "How to Think Like a Computer Scientist (python)" measuring occurrences of a character in a string

    - by Abie
    The question is how to write a program that measures how many times a character appears in a string in a generalizable way in python. The code that I wrote: def countLetters(str, ch): count=0 index=0 for ch in str: if ch==str[index]: count=count+1 index=index+1 print count when I use this function, it measures the length of the string instead of how many times the character occurs in the string. What did I do wrong? What is the right way to write this code?

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  • PHP: How to know when exec() function is finish?

    - by skiria
    I have an exec function in php file that execs a bash script. It script calls fmpeg to transcode a video file. How can I know when transcoding is finish?? $script = "/opt/lamp../name.sh" exec("$script $videoIn $id") I will try using next code but it doesn't workd. if (exec("$script $videoIn $id")) { //print on screen that the video has been transcoded }

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  • Where does getopt_long store an unrecognized option?

    - by Rob Kennedy
    When getopt or getopt_long encounters an illegal option, it stores the offending option character in optopt. When the illegal option is a long option, where can I find out what the option was? And does anything meaningful get stored in optopt then? I've set opterr = 0 to suppress the automatically printed error message. I want to create my own message that I can print or log where I'd like, but I want to include the name of the unrecognized option.

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  • Dump methods and attributes of object

    - by user246114
    Hi, I am using a third party library that provide some callbacks for a widget, but I'm not sure what the callback parameter objects are (no docs on them). Is there a way to just dump all the attributes of an object in javascript, then print them using alert(), maybe? I just want to see what methods and attributes they contain, Thanks

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  • What should I learn & use to become a pro in PHP & Python Web development?

    - by pecker
    Hello, I'll just show some code to show how I do web development in PHP. <html> <head> <title>Example #3 TDavid's Very First PHP Script ever!</title> </head> <? print(Date("m/j/y")); require_once("somefile.php"); $mysql_db = "DATABASE NAME"; $mysql_user = "YOUR MYSQL USERNAME"; $mysql_pass = "YOUR MYSQL PASSWORD"; $mysql_link = mysql_connect("localhost", $mysql_user, $mysql_pass); mysql_select_db($mysql_db, $mysql_link); $result = mysql_query("SELECT impressions from tds_counter where COUNT_ID='$cid'", $mysql_link); if(mysql_num_rows($result)) { mysql_query("UPDATE tds_counter set impressions=impressions+1 where COUNT_ID='$cid'", $mysql_link); $row = mysql_fetch_row($result); if(!$inv) { print("$row[0]"); } } ?> <body> </body> </html> Thats it. I write every file like this. Recently, I learnt OOP and started using classes & objects in PHP. I hear that there are many frameworks there for PHP. They say that one must use these libraries. But I feel they are just making things complicated. Anyway, this is how I've been doing my web development. Now, I want to improve this. and make it professional. Also I want to move to Python. I searched SO archives and found everyone suggesting Django. But, can any one give me some idea about how web development in Python works? user (client) request for page --- webserver(-embedded PHP interpreter) ---- Server side(PHP) Script --- MySQL Server. Now, is it that instead of PHP interpreter there is python interpreter & instead of php script there is python script, which contains both HTML & python (embedded in some kind of python tags). Python script connects to database server and fetches some data which will be printed as HTML. or is it different in python world? Is this Django thing like frameworks for PHP? Can't one code in python without using Django. Because, I never encountered any post without django Please give me some kick start.

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  • Converting Numpy Lstsq residual value to R^2

    - by whatnick
    I am performing a least squares regression as below (univariate). I would like to express the significance of the result in terms of R^2. Numpy returns a value of unscaled residual, what would be a sensible way of normalizing this. field_clean,back_clean = rid_zeros(backscatter,field_data) num_vals = len(field_clean) x = field_clean[:,row:row+1] y = 10*log10(back_clean) A = hstack([x, ones((num_vals,1))]) soln = lstsq(A, y ) m, c = soln [0] residues = soln [1] print residues

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  • Processing large (over 1 Gig) files in PHP using stream_filter_*

    - by mike
    $fp_src=fopen('file','r'); $filter = stream_filter_prepend($fp_src, 'convert.iconv.ISO-8859-1/UTF-8'); while(fread($fp_src,4096)){ ++$count; if($count%1000==0) print ftell($fp_src)."\n"; } When I run this the script ends up consuming ~ 200 MB of RAM after going through just 35MB of the file. Running it without the stream_filter zips right through with a constant memory footprint of ~10 MB. What gives?

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  • Problem when trying to disappear a column

    - by eddy
    I need to hide a column as well as other elements when my page is printed , and in order to do that I have a print style sheet, everything works fine, except for the column I want to make disappear, the strange thing is that my stylesheet works in IE , but it didn't in Mozilla and chrome, why's that? Html code <col width="10%" class="art-editcolumn"/> and here's the CSS class: .art-editcolumn { display: none; } Hope you can help me out with this.

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  • Missing $ on loop variable

    - by k0re
    Hi, 1 #!/usr/bin/perl 2 use strict; 3 use warnings; 4 5 my @array = qw[a b c]; 6 foreach my($a,$b,$c) (@array) { 7 print "$a , $b , $c\n"; 8 } I receive following error: Missing $ on loop variable What is wrong? I am using: perl v5.10.1 (*) built for x86_64-linux-thread-multi

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  • Is there any way to do this without using '__init__'?

    - by zjm1126
    class a(object): c=b()# how to call the b method d=4 def __init__(self): print self.c def b(self): return self.d+1 a() how to call the 'b' method not in the __init__ thanks the error is : Traceback (most recent call last): File "D:\zjm_code\a.py", line 12, in <module> class a(object): File "D:\zjm_code\a.py", line 13, in a c=b()# how to call the b method NameError: name 'b' is not defined

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  • Printing prn file in window service.

    - by Asad
    I am unable to print prn file on network printer from .Net window Service. I use File.Copy method but it does not work. I use cmd.exe through Process.Start method but it does not work. But If I copy the same code in windows form application then it works fine. Can anybody help me.

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  • logarithms in python

    - by Srikanth
    write a program to find the sum of the logarithms of all the primes from 2 to some number n, and print out the sum of the logs of the primes, the number n, and the ratio of these two quantities in python

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  • objective C string Confusion

    - by mac
    I am having code NSString *cellValue1 = [products1 objectAtIndex:indexPath.row]; when i try to print NSLog(@"cell value is %@",cellValue1); in log i am not getting anything, if i use %s, i am getting some symbols, not the string located in cellValue1. Please help me. Thanks in advance.

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