OK, I found out how to get the disconnected drives on Vista. Not easy, but it is doable:
First, you'll need the pInvoke definition of the following WinAPI functions:
- WNetOpenEnum
- WNetEnumResource
- WNetCloseEnum
and those need a struct and some enums as well.
Then you need to call those multiple times, and at the end, you get the list.
Here is the code, beware, it is long:
[DllImport("MPR.dll", CharSet = CharSet.Auto)]
static extern int WNetEnumResource(IntPtr hEnum, ref int lpcCount, IntPtr lpBuffer, ref int lpBufferSize);
[DllImport("MPR.dll", CharSet = CharSet.Auto)]
static extern int WNetOpenEnum(RESOURCE_SCOPE dwScope, RESOURCE_TYPE dwType, RESOURCE_USAGE dwUsage,
[MarshalAs(UnmanagedType.AsAny)][In] object lpNetResource, out IntPtr lphEnum);
[DllImport("MPR.dll", CharSet = CharSet.Auto)]
static extern int WNetCloseEnum(IntPtr hEnum);
public enum RESOURCE_SCOPE : uint
{
RESOURCE_CONNECTED = 0x00000001,
RESOURCE_GLOBALNET = 0x00000002,
RESOURCE_REMEMBERED = 0x00000003,
RESOURCE_RECENT = 0x00000004,
RESOURCE_CONTEXT = 0x00000005
}
public enum RESOURCE_TYPE : uint
{
RESOURCETYPE_ANY = 0x00000000,
RESOURCETYPE_DISK = 0x00000001,
RESOURCETYPE_PRINT = 0x00000002,
RESOURCETYPE_RESERVED = 0x00000008,
}
public enum RESOURCE_USAGE : uint
{
RESOURCEUSAGE_CONNECTABLE = 0x00000001,
RESOURCEUSAGE_CONTAINER = 0x00000002,
RESOURCEUSAGE_NOLOCALDEVICE = 0x00000004,
RESOURCEUSAGE_SIBLING = 0x00000008,
RESOURCEUSAGE_ATTACHED = 0x00000010,
RESOURCEUSAGE_ALL = (RESOURCEUSAGE_CONNECTABLE | RESOURCEUSAGE_CONTAINER | RESOURCEUSAGE_ATTACHED),
}
public enum RESOURCE_DISPLAYTYPE : uint
{
RESOURCEDISPLAYTYPE_GENERIC = 0x00000000,
RESOURCEDISPLAYTYPE_DOMAIN = 0x00000001,
RESOURCEDISPLAYTYPE_SERVER = 0x00000002,
RESOURCEDISPLAYTYPE_SHARE = 0x00000003,
RESOURCEDISPLAYTYPE_FILE = 0x00000004,
RESOURCEDISPLAYTYPE_GROUP = 0x00000005,
RESOURCEDISPLAYTYPE_NETWORK = 0x00000006,
RESOURCEDISPLAYTYPE_ROOT = 0x00000007,
RESOURCEDISPLAYTYPE_SHAREADMIN = 0x00000008,
RESOURCEDISPLAYTYPE_DIRECTORY = 0x00000009,
RESOURCEDISPLAYTYPE_TREE = 0x0000000A,
RESOURCEDISPLAYTYPE_NDSCONTAINER = 0x0000000B
}
[StructLayout(LayoutKind.Sequential)]
public struct NetResource
{
public RESOURCE_SCOPE dwScope;
public RESOURCE_TYPE dwType;
public RESOURCE_DISPLAYTYPE dwDisplayType;
public RESOURCE_USAGE dwUsage;
[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
public string lpLocalName;
[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
public string lpRemoteName;
[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
public string lpComment;
[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
public string lpProvider;
}
static System.Collections.Generic.Dictionary<string, NetResource> WNetResource(object resource)
{
System.Collections.Generic.Dictionary<string, NetResource> result = new System.Collections.Generic.Dictionary<string, NetResource>();
int iRet;
IntPtr ptrHandle = new IntPtr();
try
{
iRet = WNetOpenEnum(
RESOURCE_SCOPE.RESOURCE_REMEMBERED, RESOURCE_TYPE.RESOURCETYPE_DISK, RESOURCE_USAGE.RESOURCEUSAGE_ALL,
resource, out ptrHandle);
if (iRet != 0)
return null;
int entries = -1;
int buffer = 16384;
IntPtr ptrBuffer = Marshal.AllocHGlobal(buffer);
NetResource nr;
iRet = WNetEnumResource(ptrHandle, ref entries, ptrBuffer, ref buffer);
while ((iRet == 0) || (entries > 0))
{
Int32 ptr = ptrBuffer.ToInt32();
for (int i = 0; i < entries; i++)
{
nr = (NetResource)Marshal.PtrToStructure(new IntPtr(ptr), typeof(NetResource));
if (RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER == (nr.dwUsage
& RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER))
{
//call recursively to get all entries in a container
WNetResource(nr);
}
ptr += Marshal.SizeOf(nr);
result.Add(nr.lpLocalName, nr);
}
entries = -1;
buffer = 16384;
iRet = WNetEnumResource(ptrHandle, ref entries, ptrBuffer, ref buffer);
}
Marshal.FreeHGlobal(ptrBuffer);
iRet = WNetCloseEnum(ptrHandle);
}
catch (Exception)
{
}
return result;
}
public static System.Collections.Generic.Dictionary<string, NetResource> WNetResource()
{
return WNetResource(null);
}
You've got to call the WNetResource(), and you will get back the list of drives. (and cake :-))
