C3830 error appeared for no apparent reason?

[Mark]

I have a form defined that when compiling has started giving me an error
message I can't make any sense of...

FormFind.h(24): error C3830: 'System::IntPtr': value types can only inherit
from a __gc interface

The error occurs on the line following the definition of the Form class...

public __gc class FormFind : public System::Windows::Forms::Form
{ // <-- error is marked as here
public: // <-- line 24 is here!
FormFind(SqlConnection* conn) : Conn(conn)
{
InitializeComponent();
}
I haven't modified this code, in fact it's code that is generated by the
editor. I have commented out all the code that wasn't generated by the
editor but still get the error!

Any help much appreciated.

--
Best regards
Mark

[Tomas Restrepo \(MVP\)]

Mark,

I have a form defined that when compiling has started giving me an error
message I can't make any sense of...

FormFind.h(24): error C3830: 'System::IntPtr': value types can only inherit from a __gc interface

The error occurs on the line following the definition of the Form class...

public __gc class FormFind : public System::Windows::Forms::Form
{ // <-- error is marked as here
public: // <-- line 24 is here!
FormFind(SqlConnection* conn) : Conn(conn)
{
InitializeComponent();
}
I haven't modified this code, in fact it's code that is generated by the
editor. I have commented out all the code that wasn't generated by the
editor but still get the error!

Any help much appreciated.

Have you tried cleaning and rebuilding the solution? Does that help?

--
Tomas Restrepo
to****@mvps.org

[Mark]

Yes, thanks Tomas, that fixes it. Do you happen to know why this happens? I
had a similiar problem a while ago and just restarted the project! It seems
to be a common thing while working in Visual Studio.

--
Best regards
Mark Baldwin
Software Developer

CAM Systems (Dursley) Ltd.
Draycott Business Park, Cam, Dursley, Glos. GL11 5DQ
Tel: [phone] Fax: [phone]

Calls to Cam Systems may be recorded for training and quality control
purposes.

"Tomas Restrepo (MVP)" <to****@mvps.org> wrote in message
news:%2****************@tk2msftngp13.phx.gbl...

Mark,

I have a form defined that when compiling has started giving me an error
message I can't make any sense of...

FormFind.h(24): error C3830: 'System::IntPtr': value types can only

inherit

from a __gc interface

The error occurs on the line following the definition of the Form
class...

public __gc class FormFind : public System::Windows::Forms::Form
{ // <-- error is marked as here
public: // <-- line 24 is here!
FormFind(SqlConnection* conn) : Conn(conn)
{
InitializeComponent();
}
I haven't modified this code, in fact it's code that is generated by the
editor. I have commented out all the code that wasn't generated by the
editor but still get the error!

Any help much appreciated.

Have you tried cleaning and rebuilding the solution? Does that help?

--
Tomas Restrepo
to****@mvps.org

[Tomas Restrepo \(MVP\)]

Hi Mark,

Yes, thanks Tomas, that fixes it. Do you happen to know why this happens? I had a similiar problem a while ago and just restarted the project! It seems to be a common thing while working in Visual Studio.

Honestly? no idea... best guess is one of the compiler switches causes the
problems after a number of modifications...

Maybe someone from the VC team knows the answer? Ronald?
--
Tomas Restrepo
to****@mvps.org

[Ronald Laeremans [MSFT]]

Can be anything including a memory or disk corruption error. Mark, if you
can find a consistent repro for this, please enter an issue on the MSDN
feedback center.

Thanks.

Ronald Laeremans
Visual C++ team

"Tomas Restrepo (MVP)" <to****@mvps.org> wrote in message
news:ee**************@tk2msftngp13.phx.gbl...

Hi Mark,

Yes, thanks Tomas, that fixes it. Do you happen to know why this happens?

I

had a similiar problem a while ago and just restarted the project! It

seems

to be a common thing while working in Visual Studio.

Honestly? no idea... best guess is one of the compiler switches causes the
problems after a number of modifications...

Maybe someone from the VC team knows the answer? Ronald?
--
Tomas Restrepo
to****@mvps.org