@msdn=http://search.microsoft.com/search/results.aspx?qu=SCardListReaders @pinvoke=http://pinvoke.net/SCardListReaders.htm Summary: The SCardListReaders function provides the list of readers within a set of named reader groups, eliminating duplicates. !!!!C# Signature: [DllImport("winscard.dll", EntryPoint="SCardListReadersA", CharSet=CharSet.Ansi)] public static extern int SCardListReaders( int hContext, byte[] mszGroups, byte[] mszReaders, ref UInt32 pcchReaders ); !!!!VB.NET Signature: <DllImport("WinScard.dll", EntryPoint:="SCardListReadersA", CharSet:=CharSet.Ansi)> Public Shared Function SCardListReaders( hContext As IntPtr, mszGroups As Byte(), mszReaders As Byte(), ByRef pcchReaders As UInt32 ) As Integer End Function !!!!User-Defined Types: None. !!!!Notes: None. !!!!Tips & Tricks: if you invoke SCardListReaders with the hContext parameter set to null, you'll get the list of the installed readers (not the plugged ones !) !!!!Sample Code: long ret = 0; int hContext; Int32 pcchReaders = 0; int nullindex = -1; char nullchar = (char) 0; ArrayList readersList = new ArrayList(); //establish context ret = SCardEstablishContext(SCARD_SCOPE_USER,IntPtr.Zero,IntPtr.Zero,out hContext); //get readers buffer len ret = SCardListReaders(hContext,IntPtr.Zero,null,ref pcchReaders); byte[] mszReaders = new byte[pcchReaders]; // fill readers' buffer ret = SCardListReaders(hContext,IntPtr.Zero ,mszReaders, ref pcchReaders); //fill readersList //remember that readers is a multistring with a double trailing \0 // This is much easier and faster to do the allocation like this than the looping way //ASCIIEncoding asc = new ASCIIEncoding(); //String[] Readers = asc.GetString( mszReaders ).Split( '\0' ); ASCIIEncoding ascii = new ASCIIEncoding(); string currbuff = ascii.GetString(mszReaders); int len = pcchReaders; while (currbuff[0]!=nullchar) { nullindex = currbuff.IndexOf(nullchar); //get null end character string reader = currbuff.Substring(0, nullindex); readersList.Add(reader); len = len-(reader.Length+1); currbuff = currbuff.Substring(nullindex+1,len); } ret = SCardReleaseContext(hContext); !!!!Alternative Managed API: TODO Documentation: SCardListReaders@msdn on MSDN
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