/// <inheritdoc />
public ErrorCode SCardListReaders(IntPtr context, string groups, ref IntPtr readers, ref uint size)
{
ErrorCode err;
unsafe
{
// PC/SC lite does not support unicode, only utf8
// Ensure that encoding of groups if utf8
var def = Encoding.Default.GetBytes(groups);
var utf8Groups = Encoding.Convert(Encoding.Default, Encoding.UTF8, def);
fixed(uint *psize = &size)
{
fixed(byte *pgroups = utf8Groups)
{
if (size == AutoAllocate)
{
err = UnsafePrimitives.SCardListReaders(
(void *)context,
(char *)pgroups,
(char *)readers,
psize
);
if (err == ErrorCode.Success)
{
var creaders = new char[*psize];
fixed(char *pcreaders = creaders)
{
err = UnsafePrimitives.SCardListReaders(
(void *)context,
(char *)pgroups,
pcreaders,
psize
);
readers = (IntPtr)pcreaders;
}
}
}
else
{
err = UnsafePrimitives.SCardListReaders(
(void *)context,
(char *)pgroups,
(char *)readers,
psize
);
}
size = *psize;
}
}
}
return(err);
}
