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POWhat is the correct way to import IWinInetHttpInfo (COM) in .NET?
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  1. POWhat is the correct way to import IWinInetHttpInfo (COM) in .NET?
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    copied!<p>I am having great difficultly importing and using <code>IWinInetHttpInfo</code> (<a href="http://msdn.microsoft.com/en-us/library/ms774972(v=vs.85).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms774972(v=vs.85).aspx</a>), a COM interface in .NET.</p> <p>I am in the process of writing an implementation of <code>IDownloadManager</code>, which eventually led me to implement this interface to get some raw headers.</p> <p>This interface has just one method, QueryInfo (see link above). Writing the signature in .NET seems wrong, since I always get the HRESULT 0x80070057 (The Parameter is Incorrect) when I call it.</p> <p>Here's what I have so far:</p> <pre><code>[ComImport, ComVisible(true)] [Guid("79eac9d8-bafa-11ce-8c82-00aa004ba90b")] [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] [CLSCompliant(false)] public interface IWinInetHttpInfo { [return: MarshalAs(UnmanagedType.I4)] [PreserveSig] int QueryInfo( [In, MarshalAs(UnmanagedType.U4)] UInt32 dwOption, IntPtr pBuffer, [In, Out, MarshalAs(UnmanagedType.U4)] ref UInt32 pcbBuf, [In, Out, MarshalAs(UnmanagedType.U4)] ref UInt32 pdwFlags, [In, Out, MarshalAs(UnmanagedType.U4)] ref UInt32 pdwReserved); } </code></pre> <p>I have a feeling that the signature I have above is wrong, but I've no clue on how to resolve it. Any guidance would be greatly appreciated.</p> <p>EDIT: Here's sample usage:</p> <pre><code>IWinInetHttpInfo spWinInetHttpInfo = (IWinInetHttpInfo)m_pBinding; //this cast causes queryinterface to be called if (spWinInetHttpInfo != null) { uint size = 0; //sizeof(DWORD) uint flags = 0; //Get all headers uint ignore = 0; int hrTemp = spWinInetHttpInfo.QueryInfo(Constants.HTTP_QUERY_RAW_HEADERS_CRLF, IntPtr.Zero, ref size, ref flags, ref ignore); //we get here, but hrTemp == 0x80070057 } </code></pre> <p>Add'l info:</p> <p>I'm trying to port the OnProgress method writting in C++ here: <a href="http://code.google.com/p/webknowledge/source/browse/trunk/csExWB/ComUtilities/ComUtilities/UtilMan.cpp?r=7" rel="nofollow">http://code.google.com/p/webknowledge/source/browse/trunk/csExWB/ComUtilities/ComUtilities/UtilMan.cpp?r=7</a></p>
 

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