Sammy Yu wrote:
Hi guys,
I'm trying to port an application onto Windows that was originally
developed for UNIX using rpc, pthreads, and AF_UNIX sockets. I have
used cygwin to compile this application successfully. One of the
components built is a DLL which I want to invoke from a C Sharp
application. However, the application crashes whenever I call this
DLL via pinvoke in C Sharp.
************** Exception Text **************
System.DllNotFoundException: Unable to load DLL 'perm.dll': Invalid
access to memory location. (Exception from HRESULT: 0x800703E6)
at WinPcapRedirectorUI.Perm.meme ()
at WinPcapRedirectorUI.MainForm.statisticsButton_Click(Object
sender, EventArgs e) in
C:\eclipse\workspace\winperm\WinPcapRedirectorUI\MainForm.cs:line 74
at System.Windows.Forms.Control.OnClick (EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons
button, Int32 clicks)
I verified that the cygwin*.dll are in the path. I made a strip down
version of a dll, it exhibited the same behavior. Next, I compiled
the
library with -mno-cygwin flag which surprisingly worked. I suspect
that cygwin1.dll does not work with pinvoke. Can anybody confirm this
is true? I prefer not to have to port the native application to
Visual C or mingw32 as there are a lot of rpc and AF_UNIX sockets.
Are there any other alternatives? Thanks in advance for your help!
You need to initialize the DLL. Loading the Cygwin DLL from a non-Cygwin
app doesn't initialize it automatically. Only Cygwin apps do that. Off
the top of my head, I don't recall the details but this has been discussed
before in the email archives, if you want to poke around a bit for the
procedure.
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Larry Hall http://www.rfk.com
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