I had the idea of making a program that would take a list of URLs, display each one, and then let me save the web pages as they came up. So I wrote the following few lines of code. The interesting thing is that they don't work: (vb express 2010)
Imports
System.IO
Public
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In vb.net, it is possible to design a function which can operate on generic parameters which meet multiple constraints. For example, it is possible to have a function accept as a parameter a class which inherits from Control and implements IList. This function could use "Control" or "IList" methods on such an object, and also pass the object to anything that expected a Control or an IList [note that this particular combination was chosen to facilitate a brief example, not to be a particularly useful combination].
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This approach provides compile-time type-safety; there's no need for a cast that could fail at runtime. An alternative approach would be to pass the argument as either a Control or an IList, and have the function cast to the other. That would, however, fail at runtime if the object that was passed didn't in fact meet both constraints.
Under what circumstances is it good to use a generic function like the above, in what cases would it be better to have objects which are going to meet both constraints have a new interface like IListableControl(Of T) which would include a TheControl property that would return itself (cast as a control), and in what cases would it be better to have a generic ISelf(of T) interface, any implementor of which would be expected to provide a "Self" property that would return itself as a T?
Using multi-constrained generics, it's possible to do a lot of things without requiring any run-time typecasts, but I don't know what the performance costs are likely to be. I tried writing a short program to generate 65,536 different generic types at run-time, e.g. Foo(of Bar(Of Foo(Of Foo(Of Bar(Of Foo(...(Of Blah)) and it got pretty slow, so I can tell that the time required to handle generics isn't fixed, but I don't know what factors affect it.
I have problem setting up the mock to fail if the user has attempted to log in three time with failure. My code looks like this[code]...
View 2 RepliesThe scenario is that an ASP.NET webforms page will call a web service in an async manner to make about 8 web service calls to various providers for data. I would like to run them in parallel to speed things up. I also need to wait for them all to come back before moving on.
View 1 Repliesafter finally fixing many problems with my program, and finally fixing it so it could run in a backgroundworker... I started to learn INVOKE but a small problem with this. Im not sure.. do I have to INVOKE for EVERY component of a FORM I want to modify? or is there a way to group all the invokes into a single big one?or a groupbox could work?
If progreso1.InvokeRequired Then
progreso1.Invoke(New updateprogressbardelegate(AddressOf updateprogressbar), New Object() {Me.ProgressBar1, valorprogreso})
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I have a VB2008 music-player program with a listview that acts as a playlist. I created Windows Shell Context Menu entries in the registry for MP3 etc files, so if I right-click such a file in Windows Explorer it gives the option: Play in MyProg. If multiple files are selected in Windows Explorer and sent to be played in MyProg, the first one must be sent to the music player (part of same prog) and the others must be added to the playlist (listview). For this reason I must know whether a commandline call is just a single one or whether other context menu calls will follow.
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2. FunctionLayer -deals with Common Operations which get results from DataLayer and return results to Forms.3. User - deals with User. (For Reusing the User Class in other projects, i have separated this class)Here in Class2 - I have an instance of Class1( ie., DataLayer) for DB Operations.imilarly in Class3- I have an instance of Class1( ie., DataLayer) for DB Operations.Now in my form, If i create Instance of Class2. But When I need user functionality in this form, I have to create an instance of Class3 to this form.
View 6 RepliesI am venturing into WPF - first time in (VB).NET - and trying to re-create a project I started in MS Access VBA. It basically scrapes a series of pages within a web application. As you may have surmised I am having trouble with the LoadCompleted event.I have searched and found some information on it, but the "flow" of the code only lends itself to waiting for one page to load.url...All of the code execution is run in the DocumentLoaded event which works fine when you just need to navigate to one page and execute code. But I need to perform a series of these cycles for my application. How can I reliably wait for the document to fully load while still keeping the code execution in the same Sub AND not locking the UI thread? [code]That's it. Repeat for n times. my interactions with each DOM are significantly different.
View 2 RepliesI know how to call a simple old fashion asmx webservice webthod that returns a single value as a function return result. But what if I want to return multiple output params? My current approach is to separate the params by a dividing character and parse them on teh client. Is there a better way.
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I found that when group by multiple values does not work well with VB.NET, but it works well with C# ,here are my code, is there something wrong with my VB.NET Code? Here is my VB.NET code:
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What the Win32 API is? I have looked around but no where really outlines what it is. Is it basically a set of procedures, outlined by Microsoft for programmers in order to get services from the operating system? In essence is it the equivalent to making system calls abd and library calls in UNIX? And yes I now Windows makes library calls too.
View 2 RepliesI have been using DBTransaction for my current projects that access a single database. However, I read some documentation on TransactionScope and was wondering in which scenario would using TransactionScope be better? Or should I be replacing DbTransaction calls with calls to TransactionScope?
View 2 RepliesMy help files have a lot of image maps which link to popups, which I implemented as described in the Help for HHW. They work fine in the context of the help system, but if I open the html file in a browser (Firefox or IE), they don't work - nothing happens at all when I click on the hot spots.
View 2 RepliesProblem: i made a basic web-browser and i got it all to work except the URL bar... if i type something in and hit GO it works... but i want it to automatically tell me the URL of the website i'm on... the code i have tried was...
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I've created a Delegate that I intend to call Async.
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I would like for my program to navigate via textbox1.text with multiple lines and multiple url links inside of it. I know how to make the webbrowser1.navigate via textbox1.text with multiple lines, however I want my webbrowser to navigate to each url every 1-1.5 seconds once button1 is clicked. Yes, my webbrowser1 will navigate to the specified urls via the textbox1.text (multilines) with a button click, but I need the webbrowser1 to navigate in a order sequence from top to bottom of Textbox1.text (multiplelines) every 1 second. Here is the current code that I have to navigate via multilined textbox1.text control in order sequence:
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If MouseButtons.XButton2 Then CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoForward()End If I've tried this code under Form1_load, but it's not working. I didn't make my browser using the webbrowser control, for the record.
View 2 RepliesI am a newbie trying to make a application but i am having difficulties. No matter what i do i cannot get the open file dialog and the one fo saving to work. I just want them to open and save ones a web browser usually can do. I have tried so much but can't figure out what to change when i look at other people's stuff on this and other sites.
View 1 RepliesI am looking for the code to consolidate multiple .xls sheets from within multiple work books in a file all containing the same format of information. Each sheet needs to be coppied to a new sheet within a single work book.
Once in a single sheet I need to then copy data from a range of fields into one consolidated sheet.
I have a ASP.Net VB.Net application, which I developed an deployed in about 2004. I have just upgraded it to a new server and IIS 6.0. The application requires users to login from IE it and maintains their State using sessions on the server. I would like the users to be able to have multiple browsers open, each running with unique data on their client system. Is this possible, if so, what do I need to do?
View 4 Repliesi have a program and i want it to visit a pre-set list of websites which will be in a richtextbox and i want it to visit all the sites in order BUT heres my problem that idk how to fix it will only load the last page of the list it will not load any other ones. Heres my code for it to visit the websites
For i = 0 To RichTextBox1.Lines.Count - 1
WebBrowser1.Navigate(RichTextBox1.Lines(i))
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i have posted here a few times on various issues and found all the help given was substantial to get the problem resolved, im working on a tabbed webbrowser and im currently adding a bookmarks feature, i am verry new to coding and require some simple i have a menu item "bookmark" and the options of that item are dropdown items "bookmark this page" "Edit bookmarks" "add custom bookmark"Codes for them are below:
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the problem is when i click "bookmark this page" or any of the options within that bookmark menu it navigates the page to a search page and searches for "bookmark this page" then adds that search page as the bookmark :-S so really the bookmark thing is working but its bookmarking the wrong thing.but i cant find anywhere to fix this, im wondering if someone was willing to help me, im thinking the easyest way is to give someone my whole solution and files ect and that way evrything is there and can be looked in to
i also have some other problems that dont really bother me at the moment like history not showing unless u type something into the address bar but as a i said thats small and i havent even attempted a fix on it, so if i cant work it out ill come back .
I just completed building an application that reads and writes to a MS Access database located on a network drive. It works great on the computer that I created it on, but when I try to run it on another computer it fails to initialize. I'm not sure if there's a setting in the database I need to change,
View 4 RepliesI've read a lot of different questions on SO about multithreaded applications and how to split work up between them, but none really seem to fit what I need for this. Here's how my program currently basically works:
Module Module1
'string X declared out here
Sub Main()
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This is only a rough outline of what actually happens in my code by the way.
My problem being that if multiple threads start running Main2(), they're dealing with the same X value as in the other threads. The loop inside of main2 executes multiple times per millisecond, so I can't just stagger the loops. There is often duplication of work done.
How can I properly divide up the work so that the two threads running simultaneously never have the same work to run?
it is possible to do a multiple records editing by linqtosql method in one click event?What I've been trying to do is to edit all the names in the table which are having the same account number.
Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
Dim db As New memrecDataContext()
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Why is it these codes could only edit records in one datarow?Can you debug the codes to edit all records which are having the same account number after it is being query?
I am trying to use VB 2005 SendKeys.send to fill in fields in a pdf form in a browser (at an online website).The code below works correctly sending keys to Notepad or WordPad, but when I use it to send keysto pages in IE7 or Firefox or even ActiveState Komodo editor I get more than one character and the numberof repeats is variable. For example, if I send "ABC" to a Google page I get AAAAAABBBBC.I have the same problem if I send "^v" to paste from the clipboard - I get multiple pastes.I set my keyboard repeat function to a long delay which did not affect the results.
View 1 RepliesI have a class that is a downloader (I didnt make it). You create an instance of it like so:
Dim _Down As New WebFileDownloader_Down.DownloadFileWithProgress(URL, Location)URL and Location are replaced by strings. This all works fine. But when I try to download multiple files, it doesn't work, I just add this bit for another file to be downloaded:
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So I pulled out my SQL book and I think I am doing this right but VS don't seem to like it. Here is what I got:
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I would like to ask if it is possible to do a multiple records editing by linqtosql method in one click event? What I've been trying to do is to edit all the names in the table which are having the same account number. I was able to edit but only one name has been edited and the rest are not
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Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
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Why is it these codes could only edit records in one datarow? Can you debug the codes to edit all records which are having the same account number after it is being query?if that is possible for you.
I'd like to integrate Webkit.NET into a VB project, but I'm not having any luck so far. The Webkit.NET tutorial page gives a demonstration in C#, so I assume that it's possible to use this in VB.NET as well? [URL]
I added the control to the project successfully, but since I'm not familiar with C#, I haven't been able to convert the code successfully (even after running the code through a few different online C# to VB.NET converters). So... has anyone gotten Webkit.NET (or any Webkit-based browser) to work in VB.NET? Or am I just dreaming? I would love to be able to use the default .NET WebBrowser control for this project, but this project requires doing a few things that the IE browser is not capable of (but Webkit can do it easily).