how to get a pointer to a Stream?

[=?Utf-8?B?QXNzaWRv?=]

Hello @all,

can someone tell me how to get a pointer to a stream?
I need to pass the pointer to an API-Functioncall.

Thanks for any help!

[Armin Zingler]

"Assido" <As****@discussions.microsoft.comschrieb

Hello @all,

can someone tell me how to get a pointer to a stream? I need to pass
the pointer to an API-Functioncall.

Does the API function know what a .Net IO.Stream is? Haven't had it at
all yet. Declaring the argument "byval bla as io.stream" and passing "x"
(x being declared As IO.Stream) would do the job. But I have doubts that
a stream is a stream.
Armin

[Herfried K. Wagner [MVP]]

"Assido" <As****@discussions.microsoft.comschrieb:

can someone tell me how to get a pointer to a stream?
I need to pass the pointer to an API-Functioncall.

Could you post the API function's prototype?

If you are referring to the file's handle, take a look at the 'FileStream'
object's 'Handle' property.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

[=?Utf-8?B?QXNzaWRv?=]

Hello Herfried,

here is the API-Function:

Declare Function WrapCompressedRTFStream Lib "mapi32.dll" (ByRef
lpCompressedRTFStream As Long, ByVal ulFlags As Long, ByRef
lpUncompressedRTFStream As Long) As Long
"Herfried K. Wagner [MVP]" wrote:

"Assido" <As****@discussions.microsoft.comschrieb:

can someone tell me how to get a pointer to a stream?
I need to pass the pointer to an API-Functioncall.

Could you post the API function's prototype?

If you are referring to the file's handle, take a look at the 'FileStream'
object's 'Handle' property.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

[Herfried K. Wagner [MVP]]

"Assido" <As****@discussions.microsoft.comschrieb:

here is the API-Function:

Declare Function WrapCompressedRTFStream Lib "mapi32.dll" (ByRef
lpCompressedRTFStream As Long, ByVal ulFlags As Long, ByRef
lpUncompressedRTFStream As Long) As Long

You may want to wrap the stream into a
'System.Runtime.InteropServices.ComTypes.IStream' and declare the parameter
as 'ByVal ... As IStream'. However, note that your declaration is not valid
for VB.NET.

Untested:

\\\
Imports System.Runtime.InteropServices
Imports System.Runtime.InteropServices.ComTypes
....
Public Declare Function WrapCompressedRTFStream Lib "mapi32.dll" ( _
ByVal lpCompressedRTFStream As IStream, _
ByVal ulflags As UInt32, _
<Out()ByVal lpUncompressedRTFStream As IStream _
) As IntPtr
///

Maybe you have to specify additional marshalling attributes.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>