Re: Character case assistance needed - C# Discussion Boards

Re: Character case assistance needed

venomation23-Feb-10 7:29

venomation

23-Feb-10 7:29

Ok I will use that, beats the casting anyway :P

Re: Character case assistance needed

harold aptroot23-Feb-10 7:33

harold aptroot

23-Feb-10 7:33

thebuzzwright wrote:
Someone suggested a "lookup table" but I do not know what it is , possibly a Dictionary type?

An array of chars, indexed by the char you want to uppercase
Also, I thought that comparisons on chars were perfectly valid?
The cast for letter shouldn't matter that much. But why are "ascii" and "letter" not the same variable?

Re: Character case assistance needed

venomation23-Feb-10 8:19

venomation

23-Feb-10 8:19

Ah thanks for the description of a lookup table Big Grin | :-D

I have changed the code to:

if (_letter < 65 || _letter > 122) continue;
                    if (_letter >= 97 && _letter <= 122)//char is lower case
                    {
                      
                        _letter = char.ToUpper(_letter);

                    }

Performance wise its slightly better as expected, I didn't know char had a "ToUpper()"

Thanks for the help Big Grin | :-D

Re: Character case assistance needed

PIEBALDconsult23-Feb-10 8:46

PIEBALDconsult

23-Feb-10 8:46

You don't need the ifs at all; ToUpper performs them itself so you're performing them twice -- and thereby hurting performance.

"The uppercase equivalent of c, or the unchanged value of c, if c is already uppercase or not alphabetic."

Re: Character case assistance needed

OriginalGriff23-Feb-10 8:47

OriginalGriff

23-Feb-10 8:47

Snap!

You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace

C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy

Re: Character case assistance needed

OriginalGriff23-Feb-10 8:46

OriginalGriff

23-Feb-10 8:46

Performance wise, it may be worth taking out the tests to see if you need to do the conversion - it may well be that the .NET ToUpper is more efficient than yours, and since it will be done anyway whenever ToUpper is executed, you may find it quicker without testing - particularly if you are looking at normal text where nearly all characters are lower case to start with.

Re: Character case assistance needed

Luc Pattyn23-Feb-10 12:04

Luc Pattyn

23-Feb-10 12:04

The code shown translates to a few instructions only, so it takes a fraction of a microsecond to execute; if your text handling seems slow, look at the larger picture (and explain and show us more). Unless you need complex calculations and decisions, file input/output is likely to dominate the performance.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that.
All Toronto weekends should be extremely wet until we get it automated in regular forums, not just QA.

Re: Character case assistance needed

venomation23-Feb-10 22:16

venomation

23-Feb-10 22:16

I have decided to post the full source of the code so far, the code is a bit messy but I felt I had to break some coding standards to achieve higher performance so here it goes:

using System;
using System.Text;
using System.IO;

namespace CharacterReader
{
    unsafe class Program
    {
        static readonly char[] Letter = new char[26];//stores each letter in the alphabet
    
        static string _fileName = "lol.txt";//filename to search for


        [STAThread]//allows a windos form controll to be called on an single thread
        static void Main()
        {
            using (System.Windows.Forms.OpenFileDialog open = new System.Windows.Forms.OpenFileDialog())
            {
                if (open.ShowDialog().Equals(System.Windows.Forms.DialogResult.OK))
                {

                    _fileName = open.FileName;

                }
            }
           uint *value = stackalloc uint[26];
            Load();//loads the alphabet
            Console.WriteLine("Reading File...");
            ReadFile(_fileName);
            Console.WriteLine("Analysing file...");
            AnalyseFile(value);
            Console.WriteLine("Done!");
            GetTotal(value);
            Console.ReadKey();

        }
        static int _index;//used for various things throughout
        static int _i;//used for loops
        static void Load()
        {

            for (_i = 65; _i < 91; _i++)
            {
                Letter[_index] = (char)_i;
                _index++;
            }
            _index = 0;
        }

        const int BufferSize = 512;//buffersize to store the files contents while reading
        static readonly StringBuilder Contents = new StringBuilder(99999);//stores the text read
        static private void ReadFile(string filename)
        {

            FileStream fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);

            StreamReader streamReader = new StreamReader(fileStream);

            char[] fileContents = new char[BufferSize];
          
  
            int* ptr = stackalloc int[1];
            *ptr = streamReader.Read(fileContents, 0, BufferSize);
            while (*ptr > 0)
            {
                Contents.Append(fileContents);
                *ptr = streamReader.Read(fileContents, 0, BufferSize);
            }
            streamReader.Close();
            fileStream.Close();


        }


        static void AnalyseFile(uint* value)
        {


            char* charPtr = stackalloc char[1];
            for (_i = 0; _i < Contents.Length; _i++)
            {
                for (int k = 0; k < Letter.Length; k++)
                {

                    *charPtr = Contents[_i];

                    if (*charPtr < 65 ) continue;
                    if (*charPtr >= 97 && *charPtr <= 122)//char is lower case
                    {
                        *charPtr = char.ToUpper(*charPtr);
                    }

                    if (!(*charPtr).Equals(Letter[k])) continue;
                    (value[k]) += 1;
                    break;
                }
            }
        }


        static void GetTotal(uint* value)
        {

            uint* biggestValue = stackalloc uint[1];
           

            for (_i = 0; _i < 26; _i++)
            {
                if (*biggestValue >= value[_i]) continue;
                *biggestValue = value[_i];
            }

            for (_i = 0; _i < 26; _i++)
            {
                if (!(*biggestValue).Equals(value[_i])) continue;
                _index = _i;
                break;
            }

            Console.WriteLine("The most common char is {0} with {1} hits", Letter[_index], *biggestValue);
        }


    }
}

Has anyone got some tips to make it run faster, it seems the "AnalyseFile" method seems to be slower than the file input OMG | :OMG:

Re: Character case assistance needed

Luc Pattyn24-Feb-10 1:11

Luc Pattyn

24-Feb-10 1:11

That looks horribly inefficient. Please replace CODE tags by PRE tags (so it gets formatted properly), then I will look into it.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Re: Character case assistance needed

venomation24-Feb-10 4:29

venomation

24-Feb-10 4:29

Thanks :P

Here is an updated version of the code, it runs very fast which is suprising, the small project was actually quite a good learning experiance for me (being a student), one of the things I learnt was that higher performance in code seems to be achieved by decrementing coding standards Laugh | :laugh:

using System;
using System.Text;
using System.IO;
using System.Diagnostics;

namespace CharacterReader
{
    unsafe class Program
    {
        static readonly char[] Letter = new char[26];//stores each letter in the alphabet

        static string _fileName = "lol.txt";//filename to search for

        //static uint[] value = new uint[26];
        [STAThread]//allows a windos form controll to be called on an single thread
        static void Main()
        {
            using (System.Windows.Forms.OpenFileDialog open = new System.Windows.Forms.OpenFileDialog())
            {
                if (open.ShowDialog().Equals(System.Windows.Forms.DialogResult.OK))
                {

                    _fileName = open.FileName;

                }
            }
            Stopwatch stopWatch = new Stopwatch();

            uint* value = stackalloc uint[26];
            Load();//loads the alphabet into Letters
            Console.WriteLine("Reading File...");
            stopWatch.Start();
            ReadFile(_fileName);
            Console.WriteLine("Analysing file...");
            AnalyseFile(value);
            Console.WriteLine("Done!");
            GetTotal(value);
            stopWatch.Stop();
            Console.WriteLine(stopWatch.Elapsed.TotalMilliseconds);
            Console.ReadKey();

        }
        static int _index;//used for various things throughout
        static int _i;//used for loops
        static void Load()
        {

            for (_i = 97; _i < 123; _i++)
            {
                Letter[_index] = (char)_i;
                _index++;
            }
            _index = 0;
        }

        const int BufferSize = 512;//buffersize to store the files contents while reading
        static readonly StringBuilder Contents = new StringBuilder(99999);//stores the text read
        static private void ReadFile(string filename)
        {

            FileStream fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);

            StreamReader streamReader = new StreamReader(fileStream);

            char[] fileContents = new char[BufferSize];


            int* ptr = stackalloc int[1];
            *ptr = streamReader.Read(fileContents, 0, BufferSize);
            while (*ptr > 0)
            {
                Contents.Append(fileContents);
                *ptr = streamReader.Read(fileContents, 0, BufferSize);
            }
            streamReader.Close();
            fileStream.Close();


        }


        static void AnalyseFile(uint* value)
        {

            char* charPtr = stackalloc char[1];
            for (_i = 0; _i < Contents.Length; _i++)
            {
                *charPtr = Contents[_i];//gets a character from stream
                if ((*charPtr < 65) || (*charPtr > 90 && *charPtr < 97) || (*charPtr > 122)) continue;//ignoring less than A

                *charPtr = char.ToLower(*charPtr);//makes sure the char is lower case
                value[*charPtr - 97] +=1;
            }
        }


        static void GetTotal(uint* value)
        {

            uint* biggestValue = stackalloc uint[1];


            for (_i = 0; _i < 26; _i++)
            {
                if (*biggestValue >= value[_i]) continue;
                *biggestValue = value[_i];
            }

            for (_i = 0; _i < 26; _i++)
            {
                if (!(*biggestValue).Equals(value[_i])) continue;
                _index = _i;
                break;
            }

            Console.WriteLine("The most common char is {0} with {1} hits", Letter[_index], *biggestValue);
        }


    }
}

Thanks for your help :P

Re: Character case assistance needed

Luc Pattyn24-Feb-10 5:17

Luc Pattyn

24-Feb-10 5:17

OK, PRE tags have turned that into a readable code snippet.
I see you got rid of the nested for loops; there was indeed no reason to have two nested loops.
Why are you still using that char pointer?

I would give the technique below a try:

// uses an array of 256 integers, assumed to be initialized to zero
static void AnalyseFile(uint* value) {
    // histogram
    foreach(char c in Contents) value[(int)c]++;
    // now add upper-case count to lower-case count, result in positions 97-122
    foreach(char uc in "ABCDEFGHIJKLMNOPQRSTUVWXYZ") {
        value[(int)uc.ToLower()]+=value[(int)uc];
}

comments:
1. performance optimization like these may be relevant only for large amounts of data
2. it has a different use of the value array
3. it will fail for non-ANSI text (when character values exceed 255).

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Re: Character case assistance needed

venomation24-Feb-10 7:26

venomation

24-Feb-10 7:26

Ok everyone thanks for your help it was very helpful Big Grin | :-D

Here is the final version of the code and I feel I have beaten it to death:

using System;
using System.Text;
using System.IO;
//using System.Diagnostics;

namespace CharacterReader
{
    unsafe class Program
    {
        static readonly byte[] Letter = new byte[26];//stores each letter in the alphabet
       // static Stopwatch stopWatch = new Stopwatch();
        static string _fileName;//filename to search for

        //static uint[] value = new uint[26];
        [STAThread]//allows a windos form controll to be called on an single thread
        static void Main()
        {
            using (System.Windows.Forms.OpenFileDialog open = new System.Windows.Forms.OpenFileDialog())
            {
                if (open.ShowDialog().Equals(System.Windows.Forms.DialogResult.OK))
                {

                    _fileName = open.FileName;

                }
            }


            uint* value = stackalloc uint[26];
            Load();//loads the alphabet into Letters
            Console.WriteLine("Reading File...");
           // stopWatch.Start();
            ReadFile( _fileName);
            Console.WriteLine("Analysing file...");
            AnalyseFile(ref value);
            Console.WriteLine("Done!");
            GetTotal(ref value);
            //stopWatch.Stop();
           // Console.WriteLine(stopWatch.Elapsed.TotalMilliseconds);
            Console.ReadKey();

        }
        static int _index;//used for various things throughout
        static int _i;//used for loops
        static void Load()
        {

            for (byte i = 97; i < 123; i++)
            {
                Letter[_index] = i;
                _index++;
            }
            _index = 0;
        }

        const int BufferSize = 512;//buffersize to store the files contents while reading
        static readonly StringBuilder Contents = new StringBuilder(99999);//stores the text read
        static private void ReadFile(string filename)
        {

            FileStream fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);

            StreamReader streamReader = new StreamReader(fileStream);

            char[] fileContents = new char[BufferSize];


            int* ptr = stackalloc int[1];
            *ptr = streamReader.Read(fileContents, 0, BufferSize);
            while (*ptr > 0)
            {
                Contents.Append(fileContents);
                *ptr = streamReader.Read(fileContents, 0, BufferSize);
            }
            streamReader.Close();
            fileStream.Close();


        }


        static void AnalyseFile(ref uint* value)
        {
            byte charPtr;
            for (_i = 0; _i < Contents.Length; _i++)
            {
                charPtr = (byte)Contents[_i];//gets a character from stream

                if (charPtr < 65) continue;//ignoring less than A
              
                if (charPtr > 122) continue;//ignoring less than A
                if (charPtr > 90 && charPtr < 97) continue;//ignoring less than A

                if (charPtr < 97)//if upper, shift it to 0-25
                {
                    value[charPtr - 65] += 1;
                }
                else
                {
                    value[charPtr - 97] += 1;
                }

            }
        }


        static void GetTotal(ref uint* value)
        {

            uint* biggestValue = stackalloc uint[1];


            for (_i = 0; _i < 26; _i++)
            {
                if (*biggestValue >= value[_i]) continue;
                *biggestValue = value[_i];
            }

            for (_i = 0; _i < 26; _i++)
            {
                if (!(*biggestValue).Equals(value[_i])) continue;
                _index = _i;
                break;
            }

            Console.WriteLine("The most common char is {0} with {1} hits", (char)Letter[_index], *biggestValue);
        }


    }
}

I read the entire English bible in under 6ms !

run PHP code on remote machine, from C#

andyxfun23-Feb-10 4:31

andyxfun

23-Feb-10 4:31

how to run a php code from your program?
like just execute an already existing php code from a remote server just like being a normal internet user requesting that the php is executed but without the need of any php-generated interface,just taking advantage of the server-side characteristics of php.
i wonder,can c# take some details that could be returned by php,maybe picking up info from cookies left on the host machine? or maybe some session details?

and another thing: can c# force a server to run a code generated right from the c# interface,maybe transferred through ftp?

thanks alot in advance!
Sniff | :^)

Re: run PHP code on remote machine, from C#

Dave Kreskowiak23-Feb-10 5:09

Dave Kreskowiak

23-Feb-10 5:09

Don't ask the same question twice. Continue this on the previous thread.

But, since you added some other questions:

andyxfun wrote:
just like being a normal internet user requesting that the php is executed but without the need of any php-generated interface

You don't need a php-generated interface. The php script can be executed from a web page.

andyxfun wrote:
,just taking advantage of the server-side characteristics of php.

php doesn't know about, nor care about, if it's running on a server or a workstation. The machine it's running on looks the same as any other.

andyxfun wrote:
i wonder,can c# take some details that could be returned by php,maybe picking up info from cookies left on the host machine?

Without a web server, there are no cookies.

andyxfun wrote:
or maybe some session details?

No web server = no session.

andyxfun wrote:
can c# force a server to run a code generated right from the c# interface,maybe transferred through ftp?

No. As I said in your previous thread, running code on a remote box is a VERY HIGH SECURITY RISK. This is not something you normally would do.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: run PHP code on remote machine, from C#

andyxfun23-Feb-10 5:40

andyxfun

23-Feb-10 5:40

ok,yeah,altmost the same question but the details make the difference: in this one i take the idea of any general php script,with the possibility of adding some new scripts using your application.
the cookies and sessions thing i asked there was referring to the fact that when you visit a webpage, this can put some cookies and some session info on your computer's temp folder and i know for a fact that both php and javascript are able to read/write these cookies and i was curious if c# may be capable of the same thing,giving me a good medium for transferring data between the php files present on the server and my project from my local computer.
as you advised me in your other comment, i will try google-ing it and see what comes!

thanks a lot, you even raised my moral!
Roll eyes | :rolleyes:

Getting Domain UserNames?

Pawan Kiran23-Feb-10 3:55

Pawan Kiran

23-Feb-10 3:55

Hi
I want to know all Operating System's usernames who are working under a particular domain.

I need to bind it to Dropdown..

Thanks in Advance..

Re: Getting Domain UserNames?

Dave Kreskowiak23-Feb-10 4:01

Dave Kreskowiak

23-Feb-10 4:01

And?? I assuming this is Active Directory, correct? You have to provide a bit more detail than what you already have. What code have you tried? Where did you run into a problem? Any error messages?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

requesting the run of a .php file?

andyxfun23-Feb-10 3:35

andyxfun

23-Feb-10 3:35

hi!

please tell me, can i request the running of a .php file located on a server via a C# program and maybe return some info some way?

i am really good at php but still suck at c# and need to finish a project for school and this would save alot of time...

thanks a lot in advance!!!
Thumbs Up | :thumbsup:

Re: requesting the run of a .php file?

Dave Kreskowiak23-Feb-10 4:00

Dave Kreskowiak

23-Feb-10 4:00

It's possible, so long as the .php code you're running does not put up a user interface or require user interaction at all. Look into the WMI Win32_Process class and you'll find that you can launch remote processes, with some restrictions. Running code on a remote box is a HUGE security risk, so it's not going to be a simple little process to do.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: requesting the run of a .php file?

andyxfun23-Feb-10 4:15

andyxfun

23-Feb-10 4:15

it is all for a school project so security is not one of my problems...

anyway,i only need php to do some basic operations on serverside like connecting to databases, adding-retrieving information and so on,and i understand that i cannot use any user interface.
thanx for the info, awaiting some more exact instructions.

i am grateful,though!
Smile | :)

Re: requesting the run of a .php file?

Dave Kreskowiak23-Feb-10 5:03

Dave Kreskowiak

23-Feb-10 5:03

andyxfun wrote:
awaiting some more exact instructions

I gave you everything you needed to do your own research and have a working concept in one or two hours (assuming you know nothing of WMI).

All you need are the classes in the System.Management namespace (covered in the MSDN documentation), the WMI Win32_Process class (a little Google goes a long way here), and some curiosity, imagination, and time. Anything beyond that is spoon feeding you the answers, and I'm not going to do you that injustice.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: requesting the run of a .php file?

andyxfun23-Feb-10 5:32

andyxfun

23-Feb-10 5:32

ok thanks a lot for your answer
right now i have a little more time to do this so i can start the search.
and yes,you are right, i know nothing of wmi...
ill get documented and try to solve all this.
thanks a lot again! Smile | :)

Re: requesting the run of a .php file?

Luc Pattyn23-Feb-10 4:30

Luc Pattyn

23-Feb-10 4:30

FYI: you can run PHP code on your local Windows machine, all it takes is a package such as XAMPP[^]. That is what I use to develop and test my web site.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Re: requesting the run of a .php file?

andyxfun23-Feb-10 4:35

andyxfun

23-Feb-10 4:35

thanks but...unfortunately, this is not the case...
i am a web developer and have a lot more experience than i have in C#...
i already have an apache server with a mysql database and php installed on my local machine, along with other tools but this project is meant to be run from any machine like a normal program, without the need of additional software installed,other than .net framework...
i have the possibility to use the advantage of server-side scripting,as this does not need the actual host of the program to own any other software packages.

thanks for trying though! Smile | :)

Re: requesting the run of a .php file?

Eddy Vluggen23-Feb-10 6:37

Eddy Vluggen

23-Feb-10 6:37

andyxfun wrote:
i am really good at php but still suck at c# and need to finish a project for school and this would save alot of time...

Would it help if you could run PHP on .NET[^]? The website has some very cool examples Smile | :)

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