[DllImport("winscard.dll", EntryPoint="SCardListReadersA", CharSet=CharSet.Ansi)]
public static extern int SCardListReaders(
int hContext,
byte[] mszGroups,
byte[] mszReaders,
ref UInt32 pcchReaders
);
<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
None.
None.
if you invoke SCardListReaders with the hContext parameter set to null, you'll get the list of the installed readers (not the plugged ones !)
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);
TODO