How Dropbox Synchronization (Algorithm) Works
Aug 15, 2011
I want to know how dropBox is able to synchronize the large data files without replacing or re-uploading the files again to the dropbox server
Example: an encrypted zip archive
Suppose I've a 1GB encrypted zip archive file Fully synchronized on my computer and on the dropbox servers. On my computer I added to that zip archive file a file of size about 5MB then saved the file on my computer. Dropbox is able to synchronize zip archive file without re-uploading the whole file again instead it just update it with the small change I've done. Also TrueCrypt containers works in that manner.
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Sep 10, 2011
How can i create a file onto dropbox.My goal is to create a Chatting Form where the user types in his/her name or types in the name of another person. If he types in the name of another person, it will see if the file exists in dropbox. If the user types in his/her name, then it will create a txt file in dropbox named after the user's name.then my application will update the file every 5 seconds. that way the chat can commence.or is there another way. My goal is to create a chat between computers on different networks, without using Any TCP/IP (not very familiar with it, and could give me errors).Dustin_K "There are 10 types of people in the world: those who understand binary and those who don't."
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Mar 26, 2012
I am attempting to use the Sharpbox API to upload a file to my dropbox account. However, when I attempt to upload a file to the "Public" folder, I get an error stating: "Couldn't retrieve child elements from the server".I have followed the steps on page 10-11 of the documentation pdf and here is the code I am currently using (as a test I am trying to upload the token.txt file):
[Code]...
EDIT: However, I just realised that you cannot share files within the apps folder (that GetRoot points to), so therefore the problem is still occurring for me.
EDIT 2: I think the problem is due to permissions when creating your app on dropbox. When you first create the app, there is the option to grant access to either the "Apps" folder, or the entire users' dropbox. I was getting the error then I created a new app that requested access to the entire users' dropbox and was then able to get at the public folder.
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Oct 1, 2009
I have a small program I am building for my boss to keep track of workers at certain job sites. With the way the economy is going my boss wants to track who is showing up at specific sites (jobs) and try to even it out among all the employees - some are not working full time... Anyway, I have two Access tables linked together with the main table being Employee Data. The second Table is Employee Jobs. Basically I have three forms. The main form on startup will show all of the employees in the company - this is basically a list of all added employees into the database (the second form comes up when you click on "ADD" - adding employee info).
My third form will be a form that basically pulls in the database info for the employee and drops all the employee names into a list box. I see in the tools section you can have a list box with check boxes next to the listed items. The form will basically be a form where job info will be saved to the database - like which job number, location etc. Instead of having to click on each employee that was at the same job and enter the information individually I would like a pull down box (with the check boxes next to each name) and then click on the employees that were at the job. Then hit save and basically all of the same job info will get saved to only the employees whose names were checked.
I am not sure how to go about doing this. some code snippets? Or explain how checking all the different names will cause the same work info to be saved to each each employees profile in the Access database?
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Jun 8, 2009
I am trying to implement an Algorithm called "Diamond-Square Algorithm" I am having trouble ending it so that it retiurns the required result. So far I have the folloiwng.
[Code]...
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Jan 7, 2012
I am a complete Newbie, but have been struggling on reading one forum after the other.I have now come across a new challenge and every bit I have tried I have failed miserably.I have a Table I placed in Gridview on a Form and it shows me:
AssetNo
ReportGroup
Denomination
RecordDate
[code]....
To just test with the combobox and one Date Picker.As Mentioned Above this returns a Blank in my combobox and Gridview and there is no AssetNo to pick from in the ComboBox anymore.
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Jun 10, 2011
I want to populate a text box from a stored table I have this for the data
With DropDownList1
.DataSource = ds.Tables("property")
.DisplayMember = "propRef"
[Code].....
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Dec 15, 2010
I want to carry out bidirectional synchronization.I have implemented the code and procedures in the walkthrough however i have nearly a hundred forms and more than 50 tables how do i go about that
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Sep 10, 2010
I have a question regarding the synchronization in multi threading.
I have a function called send which i am calling in a for loop for every data row.
This function creates threads to send emails to different people.
Public Sub send(ByVal Conn As Data.DataRow, ByVal job As Data.DataRow)
MyThread = New Thread(AddressOf Me.start)
MyThread.Start()
End Sub
But every thread created is writing to a log file at different points of time. So, there are very high chances that 2 threads write to the same file at the same time. So, do i need to use any kind of synchronization mechanisms here ? or is it fine without them ?
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Nov 2, 2011
I'm a Visual Basic beginner. I want to replicate an existing Mac application that I have with Visual Studio 2010. As you see below, this application (Mac version)'s form has a folder picture at the center. That's a drop box onto which the user can drag and drop a folder, and the application will get its path and write it to a database when the user clicks on Add. Now, according to Microsoft's web site, the PictureBox control has a property called AllowDrop, which is what I need, except that I don't see it as you see below. If PictureBox doesn't have AllowDrop, then what will be my next best alternative to accept a file/folder while displaying a picture?
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Jun 18, 2010
MainForm having a few buttons, VolForm is inheriting MainForm. I can see this perfectly in the designer.VolForm itself contains a trackbar. Now have 2 forms. Form1 and Form2 both inherit VolForm. If I change the trackbar from Form1, and then show Form2, the trackbar is not having the same value. Is there any way to keep this trackbar the same in every form that inherits VolForm?
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Mar 11, 2010
Beginning development with SQL Server 2008, VB - Visual Studio 2008 on an application that will deploy laptops remotely for 6 months or more. The laptops will have no network or internet connection. There is a requirement to sync DB changes via shipment of USB flash drives.
The remote app will have a subset of the home database data. Some tables need to be synced bi-directionally, some uni-directionally. When the laptop comes home, it will do one last sync, the local DB will be wiped, and it will connect to the home DB.
Being that there are some identity key columns and the remote is only a subset of the the home, I am not sure that SQL Server replication or synchronization functions can be utilized.
Should I Create SQL Server Compact DB's on the remote system when it is deployed and do a table by table compare (in code) to another compact DB created on the flash drive when a sync is needed?
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Apr 21, 2011
I was trying to work out the best method of synchronising an update of files via vb.net. I want to automatically update some files in a few folders from an FTP site to a local drive. This would ideally be the same folder structure, but on a specified local folder. I have looked at the FTP methods in .net and am able to transfer individual files successfully, but wondered if there was an elegant method to collecting the entire folder from the FTP and it's contents to be re-created locally. I have established the reading of an XML via linq from the ftp to establish an update single and decide whether the local machine is up-to-date or not, it's just the transfer of the folders that I'm stuck on as it's different to using a IO method.
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Jul 28, 2011
I need to develop a synchronization mechanism for 2 or more containers tha contains objects (generic classes) In each container the origin of the object can be:
1) Created New
2) Imported
3) Recovered from the bin (they have been previously deleted)
The main problem that I am facing is this one If One object has been deleted in Container A it should be Deleted in Container B as well during synchronization If one object has been DELETED in Container A (1 hour ago ) and teh same object has been DELETED and RECOVERED in Container B ( 1 hour and 1 second ago) what should i do? keeping in consideration that between the 2 computer the time is surely not identical?
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Aug 20, 2009
I am trying to test if my synchronization mechanism is set well and so for debug purposes, inserting a deliberate deadlock as under
mtx.waitone(-1)
mtx.waitone(-1)
but when i step through the code in the debugger, it runs fine without getting stuck here. I am sure there is no other thread doing a release on the mutex mtx
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Apr 27, 2011
I don't know if my question is sql server related or vb.net or both. so I will ask it here. Let say I have 3 sql servers with replication among them connected together by vpn. let say i have a customer C1 exist on first server S1 and his account is 1000$ which is the same on second server S2 on S1 they enter a new receipt, so the customer C1 on S1 balance became 1100$ while it still 1000$ on S2, and it need 1-2 min for the replication to finished if during this 1-2 min, S2 is entering invoice, C1 balance will show 1000$ while it is actually 1100$ (because the replication did not finished yet) My first idea is to make sql query getting the customer balance from 3 servers and compare them. How I can tell that the customer account are not the same on both servers or check if the replication is finished for that table holding the customer balance?
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Jan 5, 2012
I have a spreadsheet with this code:
'insert link
sheet1.Hyperlinks.Add(sheet1.Range("P1"), "http://http://www.vbforums.com", "")
the code of the button (ribbon)
[CODE]...
When I press the button, it connects to the web site. when the sheet1 is selected, it works, but when the sheet2 is selected, not works, why? the path is sheet1,What's wrong?
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Jun 26, 2010
this is my code:
Dim WB As WebBrowser
WB = GetPage("http://speed.travian.ir/a2b.php?z=" + VillageID.ToString + "&c=" + Type.ToString + "&" + AttackParams)
[code].....
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Apr 14, 2010
I'll do my best to explain what the algorithm is supposed to do:There's a class 'Recipe'.ach Recipe can include other Recipes but cannot include itself or any other Recipe that includes it. So, a simple example is we have just two Recipes A & B.A,B,C(1) Recipe C Adds B(2) Recipe B Adds A(3) Recipe attempts to add C, but can't because of the relationship. C- B - A.
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Sep 8, 2010
I'm Micah. Electrical/Electronic engineering 500 level student. I'm working on my final year project. please i need a code for the implementation of RSA algorithm in VB.NET. your assistance will be appreciated.
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Dec 26, 2009
is the algorithm for VB editor released anywhere? because i'm trying to create my own editor that gives various options like Linking and self defined array functions (see below) such that one edit can update several others in various places, but i do still wish to have the auto formatting VB editor provides us with.an example of a self defined array function (count):we can transform this:
Public Class test
Private Shared number_of_methods As Integer = 2
Public Function get_number_of_methods_juz_an_example() As Integer
Return number_of_methods
[code]....
well of course instead of the code it would be just click and select (i wrote out the code in <> just to show what's happening)
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Mar 15, 2012
i need some tutorial to implement BLS (Boneh-Lynn-Shacham) signature algorithm to create private key and public key to encrypt a message.I need tutorial to implement this in VB.NET.
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Oct 21, 2005
I found an algorithm in C# that I need to convert to C. Problem is, I have never used C# so the syntax is really strange to me.
Implementation of Berlekamp-Massey algorithm for calculating linear complexity of binary sequence
s = byte array with binary sequence
returns Length of LFSR with smallest length which generates s
[Code].....
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Dec 14, 2010
I want create my own algorithm
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Aug 21, 2009
How would I be able to use my own Encryption Algorithm in my program such as encrypting text. I havn't been able to figure this out.
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Aug 25, 2007
can you write an algorithm which can calculate 500 factorial.scientific symbol(mode) is unauthorized.Answer should be in String mode.
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Apr 29, 2009
I am using VB.NET and I am trying to come up with some algorithm or some pseudo-code, or some VB.NET code that will let me do the following (hopefully I can explain this well):I have 2 collection objects, Cob1 and Cob2. These collection objects store objects that implement an interface called ICob. ICob has 3 properties. A boolean IsSelected property, a property called Length, which returns a TimeSpan, and a Rating property, which is a short integer.
OK, now Cob1 has about 100 objects stored in the collection and Cob2 is an empty collection. What I want to do is select objects from Cob1 and copy them over to Cob2. I want the following rules obeyed when selecting the objects though:
[Code]...
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Nov 20, 2009
[code...]
So far, my friend has this, and we're trying to figure out how to get the code to tell convert F to C, and back. All we can use for input is (example:) 10,f and it will change it to 40,C.
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Apr 29, 2011
Forgive me if this is a silly question....but I think back to my Comp. Sci. classes and I distinctly remember learning/being quizzed on several sorting algorithms and the corresponding 'Big O' notation.
Outside of the classroom though, I've never actually written code to sort. When I get results from a database, I use 'Order By'. Otherwise, I use a collection class that implements a sort. I have implemented IComparable to allow sorting; but I've never gone beyond that.Was sorting always just an academic pursuit for those of us who don't implement languages/frameworks? Or is it just that modern languages running on modern hardware make it a trivial detail to worry about?
Finally, when I call .Sort on a List(Of String), for example, what sort algorithm is being used under the hood?
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May 30, 2011
I'm trying to convert the following algorithm from C# to VB.NET and the VB.NET I have is not producing the same results as my C# algorithm, can someone tell me where I've gone wrong in my conversion?
public static IEnumerable<T[]> Combinations<T>(this IEnumerable<T> elements, int k)
{
List<T[]> result = new List<T[]>();
[code]....
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