Visual Basic

Application Shutdown Event]

31-May-07 2:19

Using Web Browser Control

v1i9n6o7d31-May-07 0:33

v1i9n6o7d

31-May-07 0:33

Hi,

I am a newbie to .NET. I have just begun working on .NET 1.1. I want to build a Windows Application (thru VB.NET) that would get connected to a Web site. The Web site creates certain text files at regular intervals which need to be downloaded.

How will my application come to know whether a new text file has been created. Will the Web browser control help me in this context?

The only place where SUCCESS comes before WORK is in a dictionary.

Re: Using Web Browser Control

Dave Kreskowiak31-May-07 3:46

Re: Using Web Browser Control

31-May-07 3:46

If the webstie only supplies a single link, and no data on the file creation or update time, then no. There's no way to tell if the file has been updated without downloading it and comparing it to the last version that was downloaded.

If so, then you'll just have to parse out and store this data somewhere so you can use it in the next iteration to determine if the file has changed or not. How you get the information out of the page depends on how it's exposed by the site in question. But, if this data changes you can proceed to download the file.

Is the WebBrowser class useful in this situation?? Probably not, for two reasons. One, it doesn't exist in the .NET Framework 1.1, only 2.0 and above. And second, it's main use is for a user-inteeractive web session, not automation. HttpWebRequest[^] would be a better choice for getting web pages and parsing them.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

v1i9n6o7d31-May-07 20:07

v1i9n6o7d

31-May-07 20:07

Thank you Dave.

VBA Concurrent File operations

DanB198331-May-07 0:05

DanB1983

31-May-07 0:05

Hey

If a file on a network drive is already opened by another user is there a way in VBA to determine the name of the user and report this back?

If so any help would be much appreciated.

Thanks

Dan

Re: VBA Concurrent File operations

Dave Kreskowiak31-May-07 3:39

31-May-07 3:39

Using purely VBA, no, it's not. You'd have to convert the C++ code in this[^] article to get this kind of functionality.

Standard Question #1 when confronted with a situation like this: Is this "feature" worth the cost in development? I doubt it.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

windows vb.net

Sonia Gupta30-May-07 21:52

30-May-07 21:52

is there any event that gets raised when i right click any item in the window explorer?

Christian Graus30-May-07 22:10

30-May-07 22:10

No events get fired in your program when something happens outside your program, unless you have some sort of windows hook running.

You can most certainly write a program that causes some files and folders to be inaccessible, but it's not remotely secure, people will just find your program and turn it off. It would have to be a windows service.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Sonia Gupta30-May-07 22:13

30-May-07 22:13

U mean with the help of windows services i can do this task?????

Christian Graus31-May-07 0:17

31-May-07 0:17

I honestly think you need to refer to some beginner material for a while, you're obviously being provided with information that's beyond you.

Yes, a service could concievably hijack the way people interact with windows explorer with regard to opening files. I'd imagine it would be hard to make it foolproof ( for example, if you typed a path to a file or folder into the command window, I'm not sure how you'd stop that ), and it would be easily defeated. I still think you're wasting your time.

Having said that, there seem to be a number of commercial products that do exactly this, so I have no idea how comprehensive they are, but I'd guess that they do what this[^] talks about, and what I said to you earlier today - you can password protect files and folders by keeping them in a password protected zip.

Dave Kreskowiak31-May-07 3:32

How to deal with callback function in VB 6.0 [modified]

31-May-07 3:32

No, you can't. As Christian said, to get around your "security server", it's simply a matter of disabling it in the Services manager.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

AR Reddy30-May-07 21:04

AR Reddy

30-May-07 21:04

Hi,

How to use callbacks in VB 6.0. In other words, how to use pointer to functions in VB 6. My requirement is as follows

I am importing a function from a dll as follows..
Public Declare Function MyFun Lib "MyDLL.dll" Alias "_MyFun" (...
This is will take 2 arguments. first argument should be a pointer to another method which I have declared in my application.

for this, can anybody please give me the signature of the declarations and calling.

Please give me the sample code if anybody have.

Thanks in Advance,

-- modified at 5:36 Thursday 31st May, 2007

AR Reddy

rowindex problem

vbbeg30-May-07 20:56

vbbeg

30-May-07 20:56

hi guys

The problem im having is datagridview rowindex matches the binding dataset.table index, as long as I don't click on one of the column headers to change the datagridview sort order. can anyone help me getting rowindex to be the same no matter if i sort the DGV or not.

Thanks in advance

Robbo

-- modified at 3:31 Friday 1st June, 2007

Application Hang Problem

virendra_00730-May-07 19:48

virendra_007

30-May-07 19:48

Hi! All,
My Vb application is downloading files from a ftp site and while dowloading it hangs apparantly but it is dowloading the file in background. When I see in task manager it shows application 'not responding'. Please help me to come over this problem of application hang and tell me how to display status message (Which my application shows in normal status) in this condition when application is hang.

Looking forward for your co.operation.

Thanks and Regards,
Virendra

Re: Application Hang Problem

Christian Graus30-May-07 20:05

30-May-07 20:05

You need to download in another thread, so your UI remains responsive.

Windows

Sonia Gupta30-May-07 19:07

30-May-07 19:07

Hi Dave Kreskowiak,
i was trying to get the information to secure my file/folder by applying password .i was trying to get the links.But not found.if there exist no link then can u suggest me the books that i should read.
Thank you

Christian Graus30-May-07 19:28

30-May-07 19:28

I don't know of any way of applying a password to a file or folder. I know you can password protect a zip.

Sonia Gupta30-May-07 19:54

30-May-07 19:54

Hello Christian Sir,
can i do this thing programatically.
Actually i need a start.Perhaps this may guide me to little proportion to reach the destination.

Christian Graus30-May-07 20:09

30-May-07 20:09

I am pretty sure you've not understood me. A zip file is a specific file format, and the zip format requires a program to open it. This file format supports passwords, so you can create a file which is password protected. Actually, I suspect some Office files may support this also. But, you can't create a .txt file and put a password on it, or put a password on the folder where you keep your porno. The file system does not support it.

As Windows doesn't support creating password protected zips, I am certain you need a third party library to do it in code.

Sonia Gupta30-May-07 20:18

30-May-07 20:18

Sir i wanted to know one thing.
What happens when i right click or double click(opens the file/folder) the file/folder , i get the options like open , delete ,
If i click the open option.
What is the background operation ?
I know it will then open the file .But What is the background operation ?
Can u explain?

Christian Graus30-May-07 20:22

30-May-07 20:22

It's going to look up the file association in the registry to figure out what program to open it with, and then pass the path to the file as an argument to that executable.

Sonia Gupta30-May-07 20:28

30-May-07 20:28

Sir, I need that registry path from where all these processings begin.
can u please provide?

Christian Graus30-May-07 20:58

30-May-07 20:58

Does google not work where you live ?

The file extensions are under HKEY_CLASSES_ROOT, look at it in regedit. Not surprisingly, it's a whole hive, not just a couple of keys, given that they handle every file extension that you can double click on, on your whole computer.

Dave Kreskowiak31-May-07 3:29