Can anyone help me with this? When I run this function, on the first recursive call, WNetOpenEnum returns error 1204: "The specified network provider name is invalid."
The first call to Search is Search(null);
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Code:
public struct NetResource
{
public int dwScope;
public int dwType;
public int dwDisplayType;
public int dwUsage;
[MarshalAs(UnmanagedType.LPTStr)] public string lpLocalName;
[MarshalAs(UnmanagedType.LPTStr)] public string lpRemoteName;
[MarshalAs(UnmanagedType.LPTStr)] public string lpComment;
[MarshalAs(UnmanagedType.LPTStr)] public string lpProvider;
} // end public struct NetResource
const int NO_ERROR = 0;
const int ERROR_NOT_CONTAINER = 1207;
const int ERROR_INVALID_PARAMETER = 87;
const int ERROR_NO_NETWORK = 1222;
const int ERROR_EXTENDED_ERROR = 1208;
const int ERROR_MORE_DATA = 234;
const int ERROR_NO_MORE_ITEMS = 259;
const int ERROR_INVALID_HANDLE = 6;
const int ERROR_INVALID_ADDRESS = 487;
const int RESOURCE_CONNECTED = 0x00000001;
const int RESOURCE_GLOBALNET = 0x00000002;
const int RESOURCETYPE_ANY = 0x00000000;
const int RESOURCEUSAGE_ALL = 0X00000000;
const int RESOURCEUSAGE_CONNECTABLE = 0x00000001;
const int RESOURCEUSAGE_CONTAINER = 0x00000002;
const int RESOURCEDISPLAYTYPE_DOMAIN = 0x00000001;
[DllImport("mpr.dll")]
static extern int WNetOpenEnum(
int dwScope,
int dwType,
int dwUsage,
[MarshalAs(UnmanagedType.AsAny)][In] Object lpNetResource,
//ref NetResource lpNetResource,
out IntPtr lphEnum
);
[DllImport("mpr.dll")]
static extern int WNetEnumResource(
IntPtr hEnum,
ref int lpcCount,
//ref NetResource[] lpBuffer,
IntPtr lpBuffer,
ref int lpBufferSize
);
int errCode = 0;
string errMsg = "";
void Search(object nr)
{
//TODO: Search for domains
int rv; // Return value
IntPtr lphEnum = new IntPtr();
rv = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY, RESOURCEUSAGE_ALL, nr, out lphEnum);
if (rv == NO_ERROR)
{
IntPtr hEnum = lphEnum;
int lpcCount = 1;
NetResource lpBuffer = new NetResource();
int szNR = Marshal.SizeOf(lpBuffer);
IntPtr ptr_lpBuffer = Marshal.AllocHGlobal(szNR);
DoublyLinkedList domainList = new DoublyLinkedList();
do
{
szNR = Marshal.SizeOf(lpBuffer);
rv = WNetEnumResource(hEnum, ref lpcCount, ptr_lpBuffer, ref szNR);
lpBuffer = (NetResource)Marshal.PtrToStructure(ptr_lpBuffer, typeof(NetResource));
if (RESOURCEUSAGE_CONTAINER == (lpBuffer.dwDisplayType & RESOURCEUSAGE_CONTAINER))
{
Search(lpBuffer);
if (errCode != 0)
break;
}
else if ((rv == ERROR_MORE_DATA || rv == NO_ERROR))
domainList.Append(lpBuffer);
} while (rv == ERROR_MORE_DATA);
Marshal.FreeHGlobal(ptr_lpBuffer);
if (rv == NO_ERROR)
{
// Continue
} // end if (rv == NO_ERROR)
else if (errCode == 0)
{
errCode = 2;
errMsg = processError(rv);
}
} // end if (rv == NO_ERROR)
else if (errCode == 0)
{
errCode = 1;
errMsg = processError(rv);
}
if (nr == null)
{
searching = false;
OnSearchComplete();
}
} // end void SearchThread()
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