GetAttachmentTable and DLLIMPORT

Hi

i wonder if someone can help me. Im trying to use the GetAttachmentTable
routine in MAPI.

[DllImport("MAPIlib.dll", EntryPoint = "IMessageGetAttachmentTable")]
private static extern HRESULT pIMessageGetAttachmentTable(IntPtr
msg, ref IntPtr AttachTable);

public IMAPITable GetAttachmentTable()
{
// Call the dll function
IntPtr tablePtr = IntPtr.Zero;
HRESULT hr = pIMessageGetAttachmentTable(this.ptr, ref
tablePtr);
if (hr != HRESULT.S_OK)
throw new Exception("GetAttachmentTable failed: " +
hr.ToString());
return new MAPITable(tablePtr);
}

When i try to run this i get
Can't find an Entry Point 'IMessageGetAttachmentTable' in a PInvoke DLL
'MAPIlib.dll'.

Can anyone help?


Thanks
Neil

Sure, I'd expect that from your code. You are trying to use a function
entry point called "IMessageGetAttachmentTable" and there certainly isn't
such a thing. The method is GetAttachmentTable and it's exposed by the
IMessage interface
(http://msdn2.microsoft.com/en-us/library/ms530463(EXCHG.10).aspx). You
can't just slap the interface/class name together with a function name and
expect to call it.

That's not the only issue, though. You can't just change the name and have
it work either. GetAttachmentTable isn't a direct entry point in a DLL,
which is what P/Invoke requires. It's a method *on an interface*. That
means you need an IMessage instance, and you need to call
GetAttachementTable on that. This *cannot* be done in managed code. You'd
need a native C wrapper that could call the method as your proxy.

Where did you get this definition anyway? It looks suspiciously like it was
desined for that kind of a scenario (calling an already created native shim)
as the first parameter according to the docs is a ULONG flags variable, not
a pointer to itself.

-Chris


"Shawrie" <Shawrie@discussions.microsoft.com> wrote in message
news:2F8038E9-0B1A-44D1-BB7A-C2980C8BC61E@microsoft.com...
> Hi
>
> i wonder if someone can help me. Im trying to use the GetAttachmentTable
> routine in MAPI.
>
> [DllImport("MAPIlib.dll", EntryPoint = "IMessageGetAttachmentTable")]
> private static extern HRESULT
> pIMessageGetAttachmentTable(IntPtr
> msg, ref IntPtr AttachTable);
>
> public IMAPITable GetAttachmentTable()
> {
> // Call the dll function
> IntPtr tablePtr = IntPtr.Zero;
> HRESULT hr = pIMessageGetAttachmentTable(this.ptr, ref
> tablePtr);
> if (hr != HRESULT.S_OK)
> throw new Exception("GetAttachmentTable failed: " +
> hr.ToString());
> return new MAPITable(tablePtr);
> }
>
> When i try to run this i get
> Can't find an Entry Point 'IMessageGetAttachmentTable' in a PInvoke DLL
> 'MAPIlib.dll'.
>
> Can anyone help?
>
>
> Thanks
> Neil
>
>
>

Hi

i thought the call was a bit strange. It is within a c++ wrapper. I have
basically based it on some examples i found on the web. I have tried settting
the entry point to GetAttachmentTable but still no luck. Do you know what i
should set the entry point for this method?

thanks for your help

"Chris Tacke, MVP" wrote:

> Sure, I'd expect that from your code. You are trying to use a function
> entry point called "IMessageGetAttachmentTable" and there certainly isn't
> such a thing. The method is GetAttachmentTable and it's exposed by the
> IMessage interface
> (http://msdn2.microsoft.com/en-us/library/ms530463(EXCHG.10).aspx). You
> can't just slap the interface/class name together with a function name and
> expect to call it.
>
> That's not the only issue, though. You can't just change the name and have
> it work either. GetAttachmentTable isn't a direct entry point in a DLL,
> which is what P/Invoke requires. It's a method *on an interface*. That
> means you need an IMessage instance, and you need to call
> GetAttachementTable on that. This *cannot* be done in managed code. You'd
> need a native C wrapper that could call the method as your proxy.
>
> Where did you get this definition anyway? It looks suspiciously like it was
> desined for that kind of a scenario (calling an already created native shim)
> as the first parameter according to the docs is a ULONG flags variable, not
> a pointer to itself.
>
> -Chris
>
>
> "Shawrie" <Shawrie@discussions.microsoft.com> wrote in message
> news:2F8038E9-0B1A-44D1-BB7A-C2980C8BC61E@microsoft.com...
> > Hi
> >
> > i wonder if someone can help me. Im trying to use the GetAttachmentTable
> > routine in MAPI.
> >
> > [DllImport("MAPIlib.dll", EntryPoint = "IMessageGetAttachmentTable")]
> > private static extern HRESULT
> > pIMessageGetAttachmentTable(IntPtr
> > msg, ref IntPtr AttachTable);
> >
> > public IMAPITable GetAttachmentTable()
> > {
> > // Call the dll function
> > IntPtr tablePtr = IntPtr.Zero;
> > HRESULT hr = pIMessageGetAttachmentTable(this.ptr, ref
> > tablePtr);
> > if (hr != HRESULT.S_OK)
> > throw new Exception("GetAttachmentTable failed: " +
> > hr.ToString());
> > return new MAPITable(tablePtr);
> > }
> >
> > When i try to run this i get
> > Can't find an Entry Point 'IMessageGetAttachmentTable' in a PInvoke DLL
> > 'MAPIlib.dll'.
> >
> > Can anyone help?
> >
> >
> > Thanks
> > Neil
> >
> >
> >
>
>

Hi

My apologies i got totally wrong end of the stick. I hadnt doen the wrapper
correctly

thanks

"Chris Tacke, MVP" wrote:

> Sure, I'd expect that from your code. You are trying to use a function
> entry point called "IMessageGetAttachmentTable" and there certainly isn't
> such a thing. The method is GetAttachmentTable and it's exposed by the
> IMessage interface
> (http://msdn2.microsoft.com/en-us/library/ms530463(EXCHG.10).aspx). You
> can't just slap the interface/class name together with a function name and
> expect to call it.
>
> That's not the only issue, though. You can't just change the name and have
> it work either. GetAttachmentTable isn't a direct entry point in a DLL,
> which is what P/Invoke requires. It's a method *on an interface*. That
> means you need an IMessage instance, and you need to call
> GetAttachementTable on that. This *cannot* be done in managed code. You'd
> need a native C wrapper that could call the method as your proxy.
>
> Where did you get this definition anyway? It looks suspiciously like it was
> desined for that kind of a scenario (calling an already created native shim)
> as the first parameter according to the docs is a ULONG flags variable, not
> a pointer to itself.
>
> -Chris
>
>
> "Shawrie" <Shawrie@discussions.microsoft.com> wrote in message
> news:2F8038E9-0B1A-44D1-BB7A-C2980C8BC61E@microsoft.com...
> > Hi
> >
> > i wonder if someone can help me. Im trying to use the GetAttachmentTable
> > routine in MAPI.
> >
> > [DllImport("MAPIlib.dll", EntryPoint = "IMessageGetAttachmentTable")]
> > private static extern HRESULT
> > pIMessageGetAttachmentTable(IntPtr
> > msg, ref IntPtr AttachTable);
> >
> > public IMAPITable GetAttachmentTable()
> > {
> > // Call the dll function
> > IntPtr tablePtr = IntPtr.Zero;
> > HRESULT hr = pIMessageGetAttachmentTable(this.ptr, ref
> > tablePtr);
> > if (hr != HRESULT.S_OK)
> > throw new Exception("GetAttachmentTable failed: " +
> > hr.ToString());
> > return new MAPITable(tablePtr);
> > }
> >
> > When i try to run this i get
> > Can't find an Entry Point 'IMessageGetAttachmentTable' in a PInvoke DLL
> > 'MAPIlib.dll'.
> >
> > Can anyone help?
> >
> >
> > Thanks
> > Neil
> >
> >
> >
>
>