DISCDLGSTRUCT Structure

typedef struct _DISCDLGSTRUCT{
    DWORD cbStructure;
    HWND hwndOwner;
    LPSTR lpLocalName;
    LPSTR lpRemoteName;
    DWORD dwFlags;
} DISCDLGSTRUCT, *LPDISCDLGSTRUCT;

cbStructure

The size of the DISCDLGSTRUCT structure in bytes. This is filled in by the caller to indicate the size of the structure passed in.

hwndOwner	This specifies the HWND of the owning window.
lpRemoteName	Specifies the network resource to disconnect. This field may be set to NULL is lpLocalName is specified in which case the connection to the resource redirected from lpLocalName is disconnected.
lpLocalName	The local device name that is redirected to the network resource, such as "F:" or "LPT1".

dwFlags

Any combination of the following values:

DISC_UPDATE_PROFILE	If set, the connection will no longer be persistent (automatically restored every time the user logs on to the network). This flag is only valid if lpLocalName specifies a local device.
DISC_NO_FORCE	If not set, force will be applied when attempting the disconnect if this is required (typically because the user has open files). The user will be informed if there are open files to the connection and asked if he still wants to disconnect. If so, the disconnect will be reattempted with additional force.

WN_SUCCESS if the connection is successfully disconnected. Other error codes include the following.

WN_CANCEL	the user was asked if he really wanted to disconnect and elected not to disconnect.
WN_OPEN_FILES	unable to disconnect because the user is actively using the connection.
WN_FUNCTION_BUSY	The MPR or NP is busy (possibly initializing). The caller should retry.
WN_NO_NETWORK	network is not present.
WN_OUT_OF_MEMORY	insufficient memory to bring up the dialog.
WN_EXTENDED_ERROR	a network specific error occurred. WNetGetLastError should be called to obtain a description of the error.