COM problem

M

Martinez

Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load(Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()


Why i can't execute metod open on object db??

Marcin
 
C

Cor Ligthert [MVP]

Hi Marcin,

Probably in par1, par2, par3 has an object to be instanced what is not done.

However for not AdoNet databases the newsgroup

micorosoft.public.ado.data is probably much better,

Cor


Martinez said:
Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load(Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()


Why i can't execute metod open on object db??

Marcin
Click to expand...
 
M

Martinez

Hi Marcin,

Probably in par1, par2, par3 has an object to be instanced what is not done.

However for not AdoNet databases the newsgroup

micorosoft.public.ado.data is probably much better,

Cor

"Martinez" <[email protected]> schreef in bericht

Hello
I try declare
Click to expand...
Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)
Click to expand...
but i get error :
Click to expand...
System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load(Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun­()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApp­licationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(S­tring[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContex­t
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContex­t
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone(­)
at System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
Click to expand...
Why i can't execute metod open on object db??
Click to expand...
Marcin- Ukryj cytowany tekst -
Click to expand...

- Poka¿ cytowany tekst -
Click to expand...

Ok, but par1,par2,par3 is string.
par1="Driver=...;Server=...;Database=...;"
par2="user"
par3="password"

I add db to watch and od i
 
C

Cor Ligthert [MVP]

Martinez,

I have the idea that the problem as nothing to do with the commands

Dim db as New BtDatabase()
db.open(par1,par2,par3)

Can you outcomment them and run again?

Cor


"Martinez" <[email protected]> schreef in bericht
Hi Marcin,

Probably in par1, par2, par3 has an object to be instanced what is not
done.

However for not AdoNet databases the newsgroup

micorosoft.public.ado.data is probably much better,

Cor

"Martinez" <[email protected]> schreef in
bericht

Hello
I try declare
Click to expand...
Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)
Click to expand...
but i get error :
Click to expand...
System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load(Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun­()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApp­licationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(S­tring[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContex­t
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContex­t
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone(­)
at System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
Click to expand...
Why i can't execute metod open on object db??
Click to expand...
Marcin- Ukryj cytowany tekst -
Click to expand...

- Poka¿ cytowany tekst -
Click to expand...

Ok, but par1,par2,par3 is string.
par1="Driver=...;Server=...;Database=...;"
par2="user"
par3="password"

I add db to watch and od i
 
M

Martinez

Martinez,

I have the idea that the problem as nothing to do with the commands

Dim db as New BtDatabase()
db.open(par1,par2,par3)

Can you outcomment them and run again?

Cor
Click to expand...
I don't understand, can you explain me that ??

Marcin
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Similar Threads

Too many items in listbox? 3
System.TypeInitializationException was unhandled 0
Problem OledbDataAdapter 1
binding error 1
Printing second time fails 8
BUG in toolstrip controls that use generics 1
Does anyone uses the winforms DataRepeater???? 3
export datagridview to text file and import text file to sql servertable on the fly 2

Top