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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| mpr.lib
| Header File
| winnetwk.h
| Unicode
| WinNT
| Platform Notes
| None
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WNetOpenEnum
The WNetOpenEnum function starts an enumeration of network resources or existing connections.
DWORD WNetOpenEnum(
DWORD dwScope,
| // scope of enumeration
| DWORD dwType,
| // resource types to list
| DWORD dwUsage,
| // resource usage to list
| LPNETRESOURCE lpNetResource,
| // pointer to resource structure
| LPHANDLE lphEnum
| // pointer to enumeration handle buffer
| );
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Parameters
dwScope
Specifies the scope of the enumeration. This parameter can be one of the
following values:
Value
| Meaning
| RESOURCE_CONNECTED
| All currently connected resources (the dwUsage parameter is ignored).
| RESOURCE_GLOBALNET
| All resources on the network.
| RESOURCE_REMEMBERED
| All remembered (persistent) connections (dwUsage is ignored).
|
dwType
Specifies the resource types to enumerate. This parameter can be a combination
of the following values:
Value
| Meaning
| RESOURCETYPE_ANY
| All resources (this value cannot be combined with RESOURCETYPE_DISK or
RESOURCETYPE_PRINT).
| RESOURCETYPE_DISK
| All disk resources.
| RESOURCETYPE_PRINT
| All print resources.
|
If a network provider cannot distinguish between print and disk resources, it
may enumerate all resources.
dwUsage
Specifies the resource usage to be enumerated. This parameter can be a
combination of the following values:
Value
| Meaning
| 0
| All resources
| RESOURCEUSAGE_CONNECTABLE
| All connectable resources
| RESOURCEUSAGE_CONTAINER
| All container resources
|
This parameter is ignored if the dwScope parameter is not RESOURCE_GLOBALNET.
lpNetResource
Points to a NETRESOURCE structure specifying the container to enumerate.
If this parameter is NULL, the root of the network is assumed. Windows
organizes a network as a hierarchy; the root is the topmost container in the network.
If this parameter is not NULL, it must point to a NETRESOURCE structure. This structure can be filled in by the application or be returned
by a call to the WNetEnumResource function. The NETRESOURCE structure must specify a container resource; that is, the
RESOURCEUSAGE_CONTAINER value must be specified in the dwUsage member.
To enumerate all network resources, an application can begin the enumeration
by calling WNetOpenEnum with lpNetResource set to NULL and then use the returned handle with WNetEnumResource to enumerate resources. If one of the resources in the NETRESOURCE array returned by the WNetEnumResource function is a container resource, WNetOpenEnum can be used to open the resource for further enumeration.
If the dwScope parameter is not RESOURCE_GLOBALNET, this parameter must be NULL.
lphEnum
Points to a variable filled with an enumeration handle that can be used in a
subsequent call to WNetEnumResource.
Return Values
If the function succeeds, the return value is NO_ERROR.
If the function fails, the return value is an error code. To get extended
error information, call GetLastError. GetLastError may return one of the following error codes:
Value
| Meaning
| ERROR_NOT_CONTAINER
| The lpNetResource parameter does not point to a container.
| ERROR_INVALID_PARAMETER
| Either the dwScope or dwType parameter is invalid, or there is a bad combination of parameters.
| ERROR_NO_NETWORK
| No network is present.
| ERROR_EXTENDED_ERROR
| A network-specific error occurred. To get a description of the error, use the WNetGetLastError function.
|
The function returns error codes for compatibility with Windows version 3.1.
For compatibility with Windows NT, the function also sets the error code value
returned by GetLastError.
Remarks
The WNetOpenEnum function is used to begin enumeration of the resources in a single container.
The following examples show the hierarchical structure of a Microsoft LAN
Manager network and a Novell Netware network:
LanMan (container, in this case the provider)
ACCOUNTING (container, in this case the domain)
\\ACCTSPAY (container, in this case the server)
PAYFILES (disk)
LASERJET (print)
Netware (container, in this case the provider)
MARKETING (container, in this case the server)
SYS (disk, first one on any Netware server)
ANOTHERVOLUME (disk)
LASERJET (print)
See Also
NETRESOURCE, WNetCloseEnum, WNetEnumResource, WNetGetLastError
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