Old Basic commands.

13 Jul 2006 11:03 PM

Joe

Hi all...
In the old Quick Basic days there used to be 3 commands that seem to have
disappeared from the new visual basic. I was wondering if there are
equivalent commands to the VarPtr, Peek, and Poke commands of the old basic
in the new .net visual basic.

What I am trying to do here is lets say I have a constant variable

Dim A as string = "Panama" or Const A as String = "Panama"

At run time, I would like to change the A variable to let's say Canada, so
after the application is closed and then run again, the A variable will be
equal to Canada.

If so, can someone show me some examples of how to do this please and thank
you.

Joe

13 Jul 2006 11:08 PM

Herfried K. Wagner [MVP]

"Joe" <fire***@telus.net> schrieb:
> In the old Quick Basic days there used to be 3 commands that seem to have
> disappeared from the new visual basic. I was wondering if there are
> equivalent commands to the VarPtr, Peek, and Poke commands of the old
> basic in the new .net visual basic.
>
> What I am trying to do here is lets say I have a constant variable
>
> Dim A as string = "Panama" or Const A as String = "Panama"
>
> At run time, I would like to change the A variable to let's say Canada, so
> after the application is closed and then run again, the A variable will be
> equal to Canada.

This even could not be archieved using 'VarPtr', 'Peek' and 'Poke'! You may
want to use 'My.Settings' (VB 2005), 'Microsoft.Win32.Registry',
'GetSetting' and 'SaveSetting', one of the methods described in the article
mentioned below to persist the changes and reload them when the application
gets started again.

Storing and loading user preferences
<URL:http://dotnet.mvps.org/dotnet/faqs/?id=userpreferences&lang=en>

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

14 Jul 2006 8:53 AM

Michel Posseth [MCP]

'VarPtr', 'Peek' and 'Poke' are used to manipulate memory

so it would be possible to change the value on a certain location

however restarting the prog / computer would give you the start values of
the variabels

only way you can achieve what you want is using disk based IO routines
you can do this in several ways

Database , registry , flatfile , XML , serialization of objects etc etc

regards

Michel Posseth [MCP]

Show quoteHide quote

"Herfried K. Wagner [MVP]" wrote:

> "Joe" <fire***@telus.net> schrieb:
> > In the old Quick Basic days there used to be 3 commands that seem to have
> > disappeared from the new visual basic. I was wondering if there are
> > equivalent commands to the VarPtr, Peek, and Poke commands of the old
> > basic in the new .net visual basic.
> >
> > What I am trying to do here is lets say I have a constant variable
> >
> > Dim A as string = "Panama" or Const A as String = "Panama"
> >
> > At run time, I would like to change the A variable to let's say Canada, so
> > after the application is closed and then run again, the A variable will be
> > equal to Canada.
>
> This even could not be archieved using 'VarPtr', 'Peek' and 'Poke'! You may
> want to use 'My.Settings' (VB 2005), 'Microsoft.Win32.Registry',
> 'GetSetting' and 'SaveSetting', one of the methods described in the article
> mentioned below to persist the changes and reload them when the application
> gets started again.
>
> Storing and loading user preferences
> <URL:http://dotnet.mvps.org/dotnet/faqs/?id=userpreferences&lang=en>
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>
>
>

14 Jul 2006 5:38 PM

Joe

Hello Herfried and Michel,
Thank you for your response to my question about Peek, Poke and Varptr.
I was hoping that there would be a way to find the address of a variable and
then change it by poking other characters into it just like the old Quick
basic. Right now I am already using the IO file system to do this.
I wonder why Microsoft decided to exclude these commands out of the new
Visual Basic versions....

Thanks again
Joe

14 Jul 2006 6:34 PM

Herfried K. Wagner [MVP]

"Joe" <fire***@telus.net> schrieb:
> Thank you for your response to my question about Peek, Poke and Varptr.
> I was hoping that there would be a way to find the address of a variable
> and then change it by poking other characters into it just like the old
> Quick basic.

I am wondering why you'd want to do that. It's absolutely not necessary!

> Right now I am already using the IO file system to do this.
> I wonder why Microsoft decided to exclude these commands out of the new
> Visual Basic versions....

These commands simply do not make much sense any more and pose a security
risk.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>