Chris,
Thanks for the help - works on a simple sample.
NOW I need to get oit more complicated. I need to register the
callbackthrough a com object.
Can you help there, too?
DECLARE_INTERFACE_(umIDataSink, IUnknown)
{
STDMETHOD(SetCallback) (THIS ??? Callback) PURE;
};
I basically need to get this line there completed and then need to make
a ismilar declaration for the marshaller in the managed interface.
Regards
Thomas Tomiczek
THONA Consulting Ltd.
(Microsoft MVP C#/.NET)
-----Original Message-----
From: Chris M. Szurgot [mailto:[EMAIL PROTECTED]]
Sent: Dienstag, 23. April 2002 15:06
To: [EMAIL PROTECTED]
Subject: Re: [DOTNET] Callback? Possibble from C#?
Yes, it is possible (and quite easy too...)
Create the delegate callback to be as close to the expected function,
and then put that delegate into the [DllImport] for the unmanaged code.
Then, when you call it, it should work fine. Below is the pertinent code
for using CopyFileEx, since that's the one I have handy.
Chris
--------------------------------------------------------------------
public delegate int ProgressCallback(
long totalSize, long totalTransfered, long streamSize,
long streamTransfered, int streamNumber, int callbackReason,
IntPtr hSourceFile, IntPtr hDestFile, IntPtr data);
[DllImport("Kernel32.dll")]
public static extern bool CopyFileEx(String existingFileName, String
newFileName, ProgressCallback callback, IntPtr callbackData,
bool cancel, int copyFlags);
CopyFileEx(fromFile, toFile, new ProgressCallback(Progress),
IntPtr.Zero, false, COPY_FILE_RESTARTABLE);
--------------------------------------------------------------------
-----Original Message-----
From: Thomas Tomiczek [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 23, 2002 8:37 AM
To: [EMAIL PROTECTED]
Subject: [DOTNET] Callback? Possibble from C#?
Hello,
I have an API (C style, DLL based) that requires me to register a
callback. The DLL has a function where as one parameter it either gets
a pointer to the function to call or NULL.
Can I somehow pass a delegate in there? Any samples around?
Regards
Thomas Tomiczek
THONA Consulting Ltd.
(Microsoft MVP C#/.NET)
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