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
I have a class in vb.net like
Public Class Customer
Private _Name As String
Public Overridable Property Name() As String
Get
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the propINfo.canRead property is always false, shouldn't this be true since base class implements the getter of the property ?
What is the VB2010 mechanism for obtaining a form's handle?
View 1 RepliesI 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
View 1 RepliesI 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 ?
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.
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?
View 2 RepliesBeginning 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?
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.
View 1 RepliesI 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?
I would like to make mechanism to prevent a logfile to grow bigger than 4 Mb. Therefore I compare the filesize, get with
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With a string value saved in the registry. Now the thing is, that sometimes a backup of the logfile is made, while the actual size is 6 Kb, and the limit as saved in the registry is 4194304. ??
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?
View 2 RepliesI don't understand the error, Argument not specified for parameter 'test' of 'Public Shared Function TestThis(test As String)'.
Partial Public Class Form1
Shared Sub ReceiveCallback(ByVal ar As IAsyncResult)
Form1.Invoke(TestThis, New Object(){"test"}) 'error
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Dim hashfromMd5 As MD5 = MD5.Create()data = hashfromMd5.ComputeHash(input)How can I get the percent of progress, progress related to "reading" the (input) -- using "data"? -- to be displayed live
View 1 Repliesi have created some shareware applications. I implemented the following mechanism for piracy protection. Before Windows Vista and Windows 7 i did write a dll file to the System32 folder with an encrypted license key. Also in the Registry under HKEY_LOCAL_MACHINE i inserted a registry key.
The problem is that with Windows Vista and Windows 7 due to the User Account Control (UAC) this is denied.
I want to ask : what other mechanism can be implemented ? Where should i store the encrypted key file and the registry key.
I want that the application can be installed for all users of a computer only once.
If i stored the key in the user's application data directory then another user could easily just install it under another user account. Also i do not want to put the key file in the application directory because that would be too obvious.
note that i create the registry key with my application and not with the installer.
how to set My.settings.test to 00.00 value every 24 hours?
View 25 Repliesexample 1:First....hen...(Because 4 is less than 70)Example 2:irst...Then...(Because 70 has a number which is 4 it will no longer be tested so we will test the second number which is 5)
View 8 Replieshow can i test if datable exists?
View 1 Repliesif I could make a tcp server and client so he can restart a game server from a LAN connection. The game server is a test server for online playing games it allows users to test there created maps but after so many errors the program is told to close out the running server cause of errors. The problems are fixed just by restarting the server. I have the client working as far as i know (cant do a full test without a server). During the creation of the TCP client built within the server (to receive commands and send reply) ive used
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I am accessing an sqlite database file from my VB.NET application.Currently, I use Try... Catch when opening the connection to the database, however if the database is locked by another application, it will take 5-10 seconds to throw the exception which says that the database is locked.
So I want to know if there is a way to test if the database is locked before I try to open the connection... because the long 5-10 second pause is annoying.
I fill a datatable using the dataadapter. and i set the adapter.missingschemaaction = missingschemaaction.AddwithKey. i set the insertcommand,updatecommand and deletecommand for the adapter as well.however, when i click on the datagridview to add new rows a new temporary primary key is not generated in my datatable.I've done this with access and sql server 2005 with no problems. im using MySQL.Net connector 6.1.2
View 4 RepliesI need test data for a IP Subnet calculator I have developed. I have tested some obvious scenarios, and all seems good, but the person developing can often be the wrong person to test.
The calculator can do one of two things:
1 - given an existing network and CIDR(mask), and a new CIDR it will create a number of networks with the appropriate number of hosts.
2 - given an existing network and CIDR(mask), and a list of c,h, (c = count, h=number of hosts) it will create the networks.
I need to make a condition such that my program waits until the webpage is completely loaded before executing my provided commands.
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and from VB6 project I reference to Test.dll but an error messege was appear A reference to Test.dll file could not be added (If I create VB NET project and reference to file Test.dll it OK )
I am trying to create a unit test similar to how I would have done one in C# but am struggling with the lambdas in vb. Bascially I am trying to mock a class and then create a stub and return. In C# I would have done something like;
MockedPersonRepository
.Stub(x => x.Find(id))
.Return(person)
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I recently upgraded to Vista Business from XP Home. I found that my Visual Basic 2008 graphics applications is running much much slower in Vista than it was in XP. I took a small piece of my application and created a test program. I've set my computer up for dual boot so I now have XP Home and Vista Business on it. I've run my test program from both OSs and the results are tremendously different.
I have a custom built computer that has a Microstar Int. KT6 - V mother board. It has an AMD Athlon XP 3200 + 2.2 GHz with 2 GB RAM. It's a 32 bit processor. I do have the 32 bit version of Vista installed. I have only PCI slots and one AGP slot on my mainboard. I'm using a NVIDIA GeForce2 Graphics card that I bought back in 2005 with 32 MB RAM. My Vista Experience Index subscores are as follows:[code...]
I'm going to attach the program I created and someone can let me know if they were able to install it and run it from the attachment. If you run it let me know your results if you run it from Vista and let me know your computer set up. What's all the goods on your computer. What kind of graphics card do you have. Is it PCIexpress, PCI or AGP.
I have to write a program for a user to take a 20 question test (A, B, C, D). The users answers will be stored in an array and compared with a 2nd array that has the correct answers. Its then supposed to go to a 2nd form when you click show score, grade it, and display whether each answer was right or wrong. I'm missing something easy probably.
CODE:
Probably a dumb question, but can you write a unit test project in one language to test against another project in a different language?I'd like to translate one of our VB assemblies into C#, but want to build unit tests to verify the results. I've tried to set a unit test project up to do this, but I can't seem to access the VB code within a unit test... I can't figure out if I'm just missing/doing something stupid, or it really isn't allowed.
View 2 RepliesI have read about Network.Downloadfile and I think I understand it! I want to know if there is an easy way to test a files date modified before downloading it. I have a lot of files in the folder. I really want to "sync" the folder. I don't want to copy every file every time I want to only download the file if I don't have the file in the destination location or if I have an Old copy.
View 4 RepliesI am new to working with SQL databases (and databases in general) so I do not have a lot of experience with how queries work and how I can practice them. When I was first learning xml and XPath, I found XPath Visualizer incredibly helpful after someone on stack overflow mentioned it to me.Due to this, I am wondering if a similar tool exists for SQL databases?Basically a tool that will allow me to connect to a database,enter queries and see somehow what the results would be like.
I have looked online a bit, however I have found relatively few options in terms of any utility that would do what I want, and that looks reliable.I will ultimately be writing an application to interact with an SQL 2008 server in vb.net, however for now I am just experimenting so I will know what I am doing when I actually want to create my application.So far I have managed to connect to the database using an OLE DB connection, but I am now looking for a way to experiement with queries without just querying and figuring out a way to interpret the results in my program. Basically I want to be able to remove the programming aspect of things so I can experiment with queries without needing to question anything in my code that is unrelated to the specific query.