Re: Creating a function using Dictionary and Datetime help?? - C# Discussion Boards

Creating a function using Dictionary and Datetime help??

19-Jul-10 12:40

I don't know the full answer, here are some bits and pieces though:

	string[] sa=assembly.GetManifestResourceNames();
	foreach (string s in sa) log(s);
...
	Bitmap bitmap=new Bitmap(type, resourceName);
...
	Icon icon=new Icon(type, resourceName);
...
	public static void PlaySound(Type type, string resourceName) {
		try {
			// inspired by http://www.bobpowell.net/playsnd.htm
			resourceName=type.Namespace+".resources."+resourceName;
			Stream stream=type.Assembly.GetManifestResourceStream(resourceName);
			int len=(int)stream.Length;
			byte[] buf=new byte[len];
			stream.Read(buf, 0, len);
			GCHandle handle=GCHandle.Alloc(buf);
			IntPtr ptr=Marshal.UnsafeAddrOfPinnedArrayElement(buf, 0);
			int res=sndPlaySound(ptr, 4);	// SND_MEMORY
			handle.Free();
			env.log(env.TRACE, "Played sound "+resourceName);
		} catch (Exception e) {
			env.error(resourceName+" failed: "+e.Message);
		}
	}

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roman_s19-Jul-10 9:25

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 9:25

I am first getting a list of strings from files that have dates in them ex. fileabc_20100612_1020.txt in a certain directory(expression S.ImportFolder)

my objective is to get a list of these dates in from a folder. My problem is that there will be some files with same dates in this case I want to select the newest one for that date like closest to 23:59 of that Date.

for example in c:\Temp there is

fileabc_20100612_1020.txt
fileabc_20100613_1020.txt
fileabc_20100614_1020.txt
fileabc_20100614_2320.txt

I would want to only import

fileabc_20100612_1020.txt
fileabc_20100613_1020.txt
fileabc_20100614_2320.txt

or exclude
fileabc_20100614_1020.txt

            string[] fileEntries = Directory.GetFiles(S.ImportFolder);
            foreach (string fileNameWithRoot in fileEntries)
            {
                string fileName = System.IO.Path.GetFileName(fileNameWithRoot);
....String manipulation.....
                DateTime dtFileName = new DateTime();
            try
                {
                    DateTime dtFileName = Convert.ToDateTime(fileName); 
                }
                catch (Exception e)
                {
                }

                dicFiles.Add(dtFileName, fileName);

Luc Pattyn19-Jul-10 9:36

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 9:36

I don't see a problem, except for choosing one of many possible ways to get there. Here are some ideas:

1.
your filename convention is such that sorting them alphabetically also sorts them chronologically, that makes things easy. Start by sorting them alphabetically; if you think they already are, that is only true sometimes, it depends on the file system (NTFS versus FAT).

2.
you can convert a datetime string to a DateTime using DateTime.ParseExact() or DateTime.TryParseExact(). Works much better than any Convert method. But you don't have to. See below.

3.
when scanning the files chronologically, you're only interested in the last one of each date, so compare the date (or the first 16 characters, or all but the last 8 characters) of two consecutive names, when equal do nothing, when different, keep the oldest one. Make sure to also keep the very last file.

Smile | :)

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roman_s19-Jul-10 9:47

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 9:47

I am importing another system's files therefor I do cannot change the file naming convention

so Im thinking of parsing the file into: datetime, full name

How can I compare the each record against each other with the first 8 digits for example 20100719 and if it finds another string node with 20100719 to then look at the substring/node which would be the next 6 digits after the date.
then delete the record that is not the most current for that date.

Thanks in advance

Luc Pattyn19-Jul-10 9:58

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 9:58

o0romeo0o wrote:
I do cannot change the file naming convention

I never suggested you change it; I said to take advantage of it.

I suggest you reread by earlier reply. it is all in there.

o0romeo0o wrote:
How can I compare the each record against each other

There is no need to do that; just sort the array as I said before.

Smile | :)

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roman_s19-Jul-10 10:52

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 10:52

Thank you for your reply

I don't need the for example the last 4 latest records in the array... as I can have several days and the oldest date has 3 times it was altered creating 3 different files for that day... I would need the newest one.

Luc Pattyn19-Jul-10 11:22

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 11:22

I did read and understand your original post.
I'm not so sure you did read and understand any of my replies so far.
Anyway I have added yet another reply with the full code, albeit untested.
For me the subject is closed.

Hmmm | :|

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DaveyM6919-Jul-10 10:02

DaveyM69

19-Jul-10 10:02

If the filename will always be in the format

name_yyyyMMdd_HHmm.extension

then you could use something like this (needs some [alot of] optimization but works). You can now implement a custom comparer to compare by name and if eqaul, compare by date.

// string wrapper for filename format 'name_yyyyMMdd_HHmm.ext'
public class MyFileData
{
    private string fullname;

    public MyFileData(string fullname)
    {
        this.fullname = fullname;
    }

    public string Fullname
    {
        get { return fullname; }
    }
    public string Name
    {
        get { return fullname.Substring(0, fullname.IndexOf('_')); }
    }
    public DateTime DateTime
    {
        get { return DateTime.ParseExact(fullname.Substring(fullname.IndexOf('_') + 1, 13), "yyyyMMdd_HHmm", CultureInfo.InvariantCulture); }
    }
    public string Extension
    {
        get { return fullname.Substring(fullname.IndexOf(".") + 1); }
    }
}

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: Creating a function using Dictionary and Datetime help??

roman_s19-Jul-10 10:46

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 10:46

So I created a dictionary DICTIONARY1

dicFilesDT.Add(dateParts[1], (dateParts[1] + dateParts[2] ));

so that I would have just the:

KEY as the Date and
VALUE as the Date+Time

I need help in making another dictionary (DICTIONARY2) that would

1. If there are no Duplicates from checking DICTIONARY2 using foreach keyvaluepair in DICTIONARY1 add Key Pair to DICTIONARY2

2. Check for duplicates of the Key (Date) (thinking ex. dictionary.ContainsKey)

if the dictionary has the KEY then
Compare the KEY VALUE from DICTIONARY 1 to DICTIONARY 2 to see which one is larger

ex. 230132 compared to 100425

if DICTIONARY1 KEY VALUE is larger Delete KeyValuePair from DICTIONARY 2 and add DICTIONARY 1 KEY VALUE

else do nothing and continue the loop

Thank you folks for helping me wiht this.

Luc Pattyn19-Jul-10 11:15

Re: Creating a function using Dictionary and Datetime help??

19-Jul-10 11:15

You're making it all way too complex. Here is what I would do (untested!):

string[] files = Directory.GetFiles(S.ImportFolder);
Array.Sort(files);
int count=files.Length;
for(int i=1; i<=count; i++) {
    string curr=files[i-1];
    string next="_the_end_";
    if (i<count) next=files[i];
    if (strcmp(curr.Substring(0,curr.LastIndexOf('_')), next.Substring(0,next.LastIndexOf('_'))!=0) {
        // process or store curr as it is the last one of this date
    }
}

Some nasty trick was used to make sure the last file is also included.

Smile | :)

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roman_s20-Jul-10 3:35

Re: Creating a function using Dictionary and Datetime help??

20-Jul-10 3:35

Hi Luc,

I tried the above code, just trying to debug the last line
if (strcmp(curr.Substring(0,curr.LastIndexOf('_')), next.Substring(0,next.LastIndexOf('_'))!=0) {

strcmp is a c++ concept, is that similiar to StringComparer?

also my ide complains !=0 that it cannot be applied to an int and a string. Tried playing around with the brackets and to no function.

let me know what I can do.

Luc Pattyn20-Jul-10 4:22

generic List - Remove Duplicates

20-Jul-10 4:22

Sorry, my mistake, should not be strcmp, should be string.Compare

Smile | :)

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Kevin Marois19-Jul-10 7:15

Kevin Marois

19-Jul-10 7:15

I have a list with 22 instances of this class in it:

public class aspnetRole
{
    public Guid? RoleId { get; set; }
    public Guid? ApplicationId { get; set; }
    public string RoleName { get; set; }
    public string Description { get; set; }
    public bool IsGlobal { get; set; }
}

There are duplicate entries that I want to remove. I tried this:

List<aspnetRole> RolesNoDups = Roles.Distinct().ToList();

where Roles is the list and RolesNoDups would be the result.

When I run it there are still 22 items in RolesNoDups.

How do I do this?

Everything makes sense in someone's mind

Ennis Ray Lynch, Jr.19-Jul-10 7:20

Ennis Ray Lynch, Jr.

19-Jul-10 7:20

I don't have Distint on my generate methods.

However, you will most likely need to write a comparer or override the equals method if your class if you want to get the results expected. After all aspnetRole is a class so two instances with the same values are not the same.

Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting. I also do Android Programming as I find it a refreshing break from the MS.

"And they, since they Were not the one dead, turned to their affairs" -- Robert Frost

Kevin Marois19-Jul-10 7:22

Kevin Marois

19-Jul-10 7:22

That's what I figured, but I was hoping for a simpler way.

Thanks

Everything makes sense in someone's mind

DaveyM6919-Jul-10 7:56

DaveyM69

19-Jul-10 7:56

This MSDN page[^] says:
Returns distinct elements from a sequence by using the default equality comparer to compare values.
If you want to return distinct elements from sequences of objects of some custom data type, you have to implement the IEqualityComparer<T>[^] generic interface in the class.

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Luc Pattyn19-Jul-10 10:36