Tivoli C library and unsafe C# (a void** problem)

[Francois Vanderseypen]

Concerning marshalling of unmanaged data types from and to a
C-library, what does this error mean?
"An unhandled exception of type
'System.Runtime.InteropServices.MarshalDirectiveEx ception' occurred in
TivoliUML.exe

Additional information: Can not marshal parameter #1: Invalid
managed/unmanaged type combination (Int/UInt must be paired with I or
U)."

Thank you for any help!

[Greg Ewing [MVP]]

Francois, what does your p/invoke statement look like? That exception
usually means you are trying to use an unsupported MarshalAs attribute.

--
Greg Ewing [MVP]
http://www.citidc.com

"Francois Vanderseypen" <ne***********@hotmail.com> wrote in message
news:40*************************@posting.google.co m...

Concerning marshalling of unmanaged data types from and to a
C-library, what does this error mean?
"An unhandled exception of type
'System.Runtime.InteropServices.MarshalDirectiveEx ception' occurred in
TivoliUML.exe

Additional information: Can not marshal parameter #1: Invalid
managed/unmanaged type combination (Int/UInt must be paired with I or
U)."

Thank you for any help!

[Francois Vanderseypen]

Hi Greg,

I posted a more detailed message earlier but basically I have the following:

The C-lib signature is:

int SIT_Registry_Initialise( void ** _LdapSession ,
char* _szHost_Port,
char* _szAdmin_DN,
char* _szAdmin_Pwd);

I understand that the void** is a "byref" argument. The _LdapSession
is passed (as a connection object) to other calls thereafter. I guess
the _LdapSession is a C-structure.

How should I wrap this dll function?

At this moment it looks like:

[DllImport("SIT_UML.dll", EntryPoint="SIT_Registry_Initialise")]public
static extern int InitializeRegistry([MarshalAs(UnmanagedType.AsAny)]UIntPtr
LDAPSession,[MarshalAs(UnmanagedType.LPStr)]string
HostPort,[MarshalAs(UnmanagedType.LPStr)]string
AdminUserID,[MarshalAs(UnmanagedType.LPStr)]string AdminPassword);

and the actual call is:

UIntPtr LDAPSession=UIntPtr.Zero;
int ret=UML.InitializeRegistry(LDAPSession,"blabla","b labla","blabla");
Thanks for your help!