Cancel command - Visual Basic Discussion Boards

mikanu22-Jun-06 5:42

22-Jun-06 5:42

As I'm sure you know, there is no such thing as perfect security. In most cases all you need to do is figure out your target audience and what level of security will sufice for your purposes. It usually take to figure out something that will keep *most* hackers out.

This is a first and simple step you could take to further secure your connection strings. Encrypt them and instead of storing the key as a string in your code, obfuscate it a little bit. I'm going to give you a simple example of what that means but you can derive and go nuts with it.

let's say you have the following key "mypass123".

Dim i As Integer          ' A counter
Dim str(9) As Byte        ' This array will store the ASCII codes of the characters in the key

Dim keyLength As Integer  ' This will store the keyLength
Dim keyString As String   ' Variable used to store the key at the end, as a string

str(0) = 109              ' ASCII code for "m"
str(1) = 121              ' ASCII code for "y"
str(2) = 112              ' ASCII code for "p"
str(3) = 97               ' ASCII code for "a"
str(4) = 115              ' ASCII code for "s"
str(5) = 115              ' ASCII code for "s"
str(6) = 49               ' ASCII code for "1"
str(7) = 50               ' ASCII code for "2"
str(8) = 51               ' ASCII code for "3"
keyLength = 9             ' manually specify the length of the key

' Load keyString with the key, by appending the characters of the key
keyString = ""
For i = 0 To keyLength - 1
    keyString = keyString + Chr(str(i))
Next i

' Now you can use keyString as the key to unlock your connection string

obviously you can improve the method of obfuscation even further. Here's an example:

str(0) = 109              ' ASCII code for "m"
str(1) = str(0) + 12      ' ASCII code for "y"
str(2) = str(1) - 9       ' ASCII code for "p"
str(3) = str(2) - 15      ' ASCII code for "a"
str(4) = str(2) + 3       ' ASCII code for "s"
str(5) = str(4)           ' ASCII code for "s"
str(6) = 49               ' ASCII code for "1"
str(7) = str(6) + 1       ' ASCII code for "2"
str(8) = str(7) + 1       ' ASCII code for "3"

----
www.digitalGetto.com

Re: Securing a SQL Connection string

Marcus J. Smith22-Jun-06 7:35

Marcus J. Smith

22-Jun-06 7:35

Wow, sounds pretty reasonable.

Thanks,
Cleako

HTTPPost passing in username and password

J Liang22-Jun-06 3:39

J Liang

22-Jun-06 3:39

Hi guys,

I'm doing a program that able to login to the website without going to the website using HTTPPost. I face this problem when I need to login into PHP sites, Java Script sites are ok.

I use http://www.somesite.com/members/member-menu.php?username=UN&password=PWD but it seems it can't read the username and password that I pass over, I'd tried with another PHP site,also the same.

This is what I did in my VB.NET code
Dim PostData As String = _
"?" & usernameText & "=" & UN & _
"&" & passwordText & "= " & PWD
Data = encoding.GetBytes(PostData)

So the PostData is suppose to be send to the site to get the cookie but it return a result saying my username and password invalid, I'd tried the username and password on the site which work well. I try hashing them then only send them but with the same result, invalid username and password.

Would appreciate if anyone would give me some idea about this

J Liang

Free Refactor! for VB

Kevin McFarlane22-Jun-06 3:16

Kevin McFarlane

22-Jun-06 3:16

Anyone using it? Pretty slick isn't it?
http://msdn.microsoft.com/vbasic/downloads/tools/refactor/refactorwhitepaper/[^]

Kevin

problem playing .wmv files

seva0412197322-Jun-06 1:54

seva04121973

22-Jun-06 1:54

in code

AxMediaPlayer1.FileName="c:\temp\test.avi"

AxMediaPlayer1.Play

working properly, but when I try to play .wmv

files

AxMediaPlayer1.FileName="c:\temp\test.wmv"

AxMediaPlayer1.Play

i got error in line axmediaplayer1.play

files test.avi and test.wmv exist adn they work properly in any player

Why?

I think that this error is same one as if I dont have file or file is wrong.

"An unhandled exeption of type

System.runtime.interoptservices.COMExeption

occured in axiteropt.mediaplayer.dll

Additional information: Unspecified error"

File test.wmv exist and work in Windows media player when i start his directly

Thanks in advance

config File

Piwe22-Jun-06 0:29

Piwe

22-Jun-06 0:29

I'm a new user using VB.NET. I would kike to know how you use config File as a connection string

siwe

Re: config File

Socheat.Net23-Jun-06 17:26

Socheat.Net

23-Jun-06 17:26

Can u express yoru question again I don't understand.
Regard
Socheat

................

Cancel command

angelagke21-Jun-06 23:22

angelagke

21-Jun-06 23:22

In my options page has 2 button, 'Save' and 'Cancel'.
After i doing changes for all particular fields in options page, then i click 'Save' button to save it. It works successfully.
But my problem is if user click button 'Cancel', then my program should rollback all transaction and the data will back to previous data before i click the 'Save' button.
So, has any coding to do rollback transaction in VB6?? Confused | :confused:

Angela

Re: Cancel command

Dave Kreskowiak22-Jun-06 8:17

Dave Kreskowiak

22-Jun-06 8:17

That all depends on what you mean by "transaction".

But normally, you'd let the user pick a bunch of options in the dialog and not apply any of those changes until the user clicks Save or OK. Until then, you can just not do anything if the user clicks Cancel.

Dave Kreskowiak
Microsoft MVP - Visual Basic

How to know if the image is valid

mysterious3rd21-Jun-06 22:22

mysterious3rd

21-Jun-06 22:22

Hello everybody

I'm workin' on a project in which i have to load an image in an image box every period of time so i'm using a timer to do that, this image comes from another PC using the MScomm.
The problem is that if the image didn't comletely and correctly arrive the computer stuck, even if i put "on error resume next" at the top of the timer.
So is there any way i can check if the image is valid before loading it in the image box.

I appreciate your cooperation and thank you very much.

Re: How to know if the image is valid

mikanu22-Jun-06 5:48

mikanu

22-Jun-06 5:48

What kind of image are you using (what format). Also, did you write the other application that sits on the other computer and sends the images over MSComm?! If so, I would add a checksum to every transmission and check that first, before displaying the image. This would tell you if something got corrupted on the way..

----
www.digitalGetto.com

MAPI

eKuzu21-Jun-06 21:58

eKuzu

21-Jun-06 21:58

How can i read my mails from Exchange Server with MAPI ASP Application Sigh | :sigh:

i need some MAPI Codes...

read a wav file and write buffer into anothet wav file

sihotamarpal21-Jun-06 20:54

sihotamarpal

21-Jun-06 20:54

hi i have made two function readwav() and writewav()

----------------------
algo for readwav func
----------------------
reading the wav file in following sequence
1.check the 'WAVE' chunk
2.check the 'fmt ' chunk
3.read the wavformat info of that wav file and store in type
4.check the 'data' chunk
5.read the no of bytes in file

-------------------------
algo for writewav func
-------------------------
writing the wav file in following sequence
1.write the 'WAVE' chunk
2.write the 'fmt ' chunk
3.write the wavformat info that i store in type while reading
4.write the 'data' chunk

my ques is who i read a wav buffer from a open wav file and
how i write a wav buffer in wav file
means how i write another readbuffer() and writebuffer() func's
plz help me

Running VB Application from CD

abhaysurve21-Jun-06 20:36

abhaysurve

21-Jun-06 20:36

I would like to run the VB Application having MS Access Database as the back-end. Condition is the application is in .exe format & there is no setup. The VB Application is not to be installed on the Computer but must be run from the CD.

Re: Running VB Application from CD

Dave Kreskowiak22-Jun-06 1:23

Dave Kreskowiak

22-Jun-06 1:23

Unfortunately, if you're going to use an Access database as the back end, you can't do this. Any access to that database requires read and write access to the database file, which you will not get on a CD.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Windows service

Rsekaran21-Jun-06 19:08

Rsekaran

21-Jun-06 19:08

I have one vb.net windows application with one form; this is a small utility program. This Zip the content of the specific folder in a certain interval and copy the content in to some other place & keep the folder empty always. While running the application this sits in System tray as icon. This runs in the server always (24 X 7). This application I want to run as a windows service, because when ever server gets restarted, I have to run this application manually.

I tried to put this in windows service, it's running, but my problem is, I don't know how to launch the system try icon while running the service. I want once the service starts; my utility exe icon should come in system tray. Any body has solution for my problem.

Rajasekarn.

oop

md_refay21-Jun-06 12:06

md_refay

21-Jun-06 12:06

what is the mean of oop

ma_refay

Re: oop

mr_1234521-Jun-06 12:14

mr_12345

21-Jun-06 12:14

object oriented programming

Re: oop

md_refay21-Jun-06 12:27

md_refay

21-Jun-06 12:27

i know that oop is object oriented programming
i need what it's mean ? the description of oop?

ma_refay

Re: oop

Steve Pullan21-Jun-06 12:47

Steve Pullan

21-Jun-06 12:47

ma_refay wrote:
i know that oop is object oriented programming
i need what it's mean ? the description of oop?

Then you very badly phrased the question in the first place!

Instead of wasting our time - and yours asking stupid questions - find the answer by searching for it on Google or this great site.

...Steve

1. quod erat demonstrandum
2. "Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." I read that somewhere once Smile | :)

Re: oop

Mekong River21-Jun-06 14:19

Mekong River

21-Jun-06 14:19

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2005-49,GGLD:en&q=OOP[^]

Using data from form1 on form2

Larry White21-Jun-06 11:16

Larry White

21-Jun-06 11:16

I know this is probably a basic question, but here goes. I am building a Windows form based application. I have a form1 that opens up, users enter information, then I would like to e-mail the selected information from some selected textbox's using another form2. Or is it easier to email the data from the textboxs without a form?

A second minor problem is how do you eliminate the Microsoft Outlook message that pops up when activating the Outlook application from within VB.NET?

Thank you, Confused | :confused:

LWhite

Re: Using data from form1 on form2

mr_1234521-Jun-06 12:17

mr_12345

21-Jun-06 12:17

why not just email from form1?

I don't think you can eliminate the Outlook Message using VB.Net. You will have to use Extended MAPI. There is an article on code project that is done in C++. Search for Extended Mapi and you will find it.

Mike Lasseter

Re: Using data from form1 on form2

Larry White22-Jun-06 5:45

Larry White

22-Jun-06 5:45

I thought about just emailing form1, but it has a lot more detail than I need to mail. The second form is streamlined down to only a few data elements. I may have to simplify it even more.

Thank you,

LWhite

Re: Using data from form1 on form2

Edbert P21-Jun-06 14:43

Edbert P

21-Jun-06 14:43

The only other way you can eliminate the Outlook security message is by using Outlook Redemption[^] instead of creating standard Outlook classes.

"Democracy is two wolves and a sheep voting on what to have for dinner" - Ross

Edbert
Sydney, Australia

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