.NET (C#) and file handles

[Usenet User]

I have an API DLL with a handful of methods, which I wrapped in
DllImport-attributed methods in C#.

Everything works fine, however, one of the methods takes an open file
handle (as an int) to write its execution log into.

Is there a way in .NET to create such a handle to pass to the method?

TIA!

[Nicholas Paldino [.NET/C# MVP]]

You can create an instance of the FileStream class and use the Handle
property to get the file handle. If you are using .NET 2.0, you should use
the SafeFileHandle property (and then call DangerousGethandle on the
SafeFileHandle returned).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Usenet User" < @ . > wrote in message
news:6g********************************@4ax.com...

I have an API DLL with a handful of methods, which I wrapped in
DllImport-attributed methods in C#.

Everything works fine, however, one of the methods takes an open file
handle (as an int) to write its execution log into.

Is there a way in .NET to create such a handle to pass to the method?

TIA!

[David Browne]

"Usenet User" < @ . > wrote in message
news:6g********************************@4ax.com...

I have an API DLL with a handful of methods, which I wrapped in
DllImport-attributed methods in C#.

Everything works fine, however, one of the methods takes an open file
handle (as an int) to write its execution log into.

Is there a way in .NET to create such a handle to pass to the method?

Check out FileStream.Handle.

You would do something like

using (FileStream fs = new FileStream(...))
{
ExternalMethod( . . ., fs.Handle.ToInt32());

}

David

[Richard]

Opague structures (such as file/window handles) can be passed to/from
PInvoke via the System.IntPtr type. You should be able to do this without
the need for unsafe code blocks...

I assume, but dunno off the top of my head, that there is some way to get a
file handle from a .NET stream - if not then you can PInvoke the CreateFile()
& CloseHandle() APIs... In any event you'll probably want to remember to
implement the IDispose pattern to clean up your file handle...

"Usenet User" wrote:

I have an API DLL with a handful of methods, which I wrapped in
DllImport-attributed methods in C#.

Everything works fine, however, one of the methods takes an open file
handle (as an int) to write its execution log into.

Is there a way in .NET to create such a handle to pass to the method?

TIA!

[Usenet User]

On Tue, 30 Aug 2005 13:17:38 -0400, "Nicholas Paldino [.NET/C# MVP]"
<mv*@spam.guard.caspershouse.com> wrote:

You can create an instance of the FileStream class and use the Handle
property to get the file handle. If you are using .NET 2.0, you should use
the SafeFileHandle property (and then call DangerousGethandle on the
SafeFileHandle returned).

Hope this helps.

Thanks! I was looking exactly for that. Other option I was considering
was to use Win32 API to get such a handle.

[Usenet User]

On Tue, 30 Aug 2005 13:17:38 -0400, "Nicholas Paldino [.NET/C# MVP]"
<mv*@spam.guard.caspershouse.com> wrote:

You can create an instance of the FileStream class and use the Handle
property to get the file handle. If you are using .NET 2.0, you should use
the SafeFileHandle property (and then call DangerousGethandle on the
SafeFileHandle returned).

Hope this helps.

Thanks! I was looking exactly for that. Other option I was considering
was to use Win32 API to get such a handle.