problem save and reading from the registry

[Aussie Rules]

Hi,

I want to store some data in the registry, however I have not been able to
do this, and think my logic maybe flawed.

Firstly I try to open the registry and read in any existing values.
Dim aKey As RegistryKey
aKey = Registry.Curren tUser.OpenSubKe y("software\myA pplication")

I then attempt to read in any existing values
strServerName = aKey.GetValue(" ServerName")
strLoginName = aKey.GetValue(" LoginName")

When the first getValue is executed, i get an error 'object reference not
set to an instance of an object', which I guess is fine as this registry
entry doesn't exist yet.

If the registry entry doesn't exist (say first time the application is run),
then I capture the error on the above code and create the registry subkey=
Registry.Curren tConfig.CreateS ubKey("software \myApplication" ) ' No error on
this line

After the user has logged in, i want to save the user id and server name to
the registry, so that next time they use the program, step 1 will populate
the login form with the last login details used.

aKey.SetValue(" ServerName", frmSPlash.txtSe rver.Text)
aKey.SetValue(" LoginName", frmSPlash.txtUs erID.Text)

When the first setvalue is execute i get an error 'object reference not set
to an instance of an object'. which i would not expect as it should be just
creating the entry.

What have I done wrong here......

THanks

[Izzy]

Re: problem save and reading from the registry

Have you looked at the app.config file? This replaces storing settings
in the registry for .NET apps. If you using VS 2005 it's very simple:

'Get Value
Value = My.Settings.[SettingsName]

'Set Value
My.Settings.[SettingsName] = Value


Aussie Rules wrote:

Hi,
>
I want to store some data in the registry, however I have not been able to
do this, and think my logic maybe flawed.
>
Firstly I try to open the registry and read in any existing values.
Dim aKey As RegistryKey
aKey = Registry.Curren tUser.OpenSubKe y("software\myA pplication")
>
I then attempt to read in any existing values
strServerName = aKey.GetValue(" ServerName")
strLoginName = aKey.GetValue(" LoginName")
>
When the first getValue is executed, i get an error 'object reference not
set to an instance of an object', which I guess is fine as this registry
entry doesn't exist yet.
>
If the registry entry doesn't exist (say first time the application is run),
then I capture the error on the above code and create the registry subkey=
Registry.Curren tConfig.CreateS ubKey("software \myApplication" ) ' No error on
this line
>
After the user has logged in, i want to save the user id and server name to
the registry, so that next time they use the program, step 1 will populate
the login form with the last login details used.
>
aKey.SetValue(" ServerName", frmSPlash.txtSe rver.Text)
aKey.SetValue(" LoginName", frmSPlash.txtUs erID.Text)
>
When the first setvalue is execute i get an error 'object reference not set
to an instance of an object'. which i would not expect as it should be just
creating the entry.
>
What have I done wrong here......
>
THanks

[Peter Proost]

Re: problem save and reading from the registry

I think the problem is that you read from a different location then you
write to:

Registry.Curren tUser.OpenSubKe y("software\myA pplication")
Registry.Curren tConfig.CreateS ubKey("software \myApplication" )

Below is a working sample, hope this helps:

Greetz Peter

Dim myKey As RegistryKey
myKey = Registry.Curren tUser.OpenSubKe y("Software\tes tNG")
If myKey Is Nothing Then
myKey = Registry.Curren tUser.OpenSubKe y("Software", True)
myKey.CreateSub Key("testNG")
myKey = Registry.Curren tUser.OpenSubKe y("Software\tes tNG", True)
myKey.SetValue( "testNG", "Peter Proost")
Else
MsgBox(myKey.Ge tValue("testNG" ))
End If

--
Programming today is a race between software engineers striving to build
bigger and better idiot-proof programs, and the Universe trying to produce
bigger and better idiots. So far, the Universe is winning. (Rich Cook)

"Aussie Rules" <AussieRules@no spam.nospamschr eef in bericht
news:#tLdo66xGH A.3552@TK2MSFTN GP02.phx.gbl...

Hi,
>
I want to store some data in the registry, however I have not been able to
do this, and think my logic maybe flawed.
>
Firstly I try to open the registry and read in any existing values.
Dim aKey As RegistryKey
aKey = Registry.Curren tUser.OpenSubKe y("software\myA pplication")
>
I then attempt to read in any existing values
strServerName = aKey.GetValue(" ServerName")
strLoginName = aKey.GetValue(" LoginName")
>
When the first getValue is executed, i get an error 'object reference not
set to an instance of an object', which I guess is fine as this registry
entry doesn't exist yet.
>
If the registry entry doesn't exist (say first time the application is

run),

then I capture the error on the above code and create the registry subkey=
Registry.Curren tConfig.CreateS ubKey("software \myApplication" ) ' No error

on

this line
>
After the user has logged in, i want to save the user id and server name

to

the registry, so that next time they use the program, step 1 will populate
the login form with the last login details used.
>
aKey.SetValue(" ServerName", frmSPlash.txtSe rver.Text)
aKey.SetValue(" LoginName", frmSPlash.txtUs erID.Text)
>
When the first setvalue is execute i get an error 'object reference not

set

to an instance of an object'. which i would not expect as it should be

just

creating the entry.
>
What have I done wrong here......
>
THanks
>
>
>

[Jeffrey Tan[MSFT]]

RE: problem save and reading from the registry

Hi Aussie,

Additional to Peter's reply:

What you got is the NullReferenceEx ception, which normally means that aKey
is a null reference. The simplest way is set a breakpoint in aKey.SetValue
line, and view aKey variable in Watch Window in VS.net IDE debugger.

If once you find the null reference, you should check why aKey is not
assigned a real object instance.

Thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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