C# Signature:
[DllImport("setupapi.dll", CharSet = CharSet.Auto)]
static extern int CM_Request_Device_Eject(UInt32 devinst, out PNP_VETO_TYPE pVetoType, System.Text.StringBuilder pszVetoName, int ulNameLength, int ulFlags);
VB Signature:
Declare Function CM_Request_Device_Eject Lib "setupapi.dll" (TODO) As TODO
User-Defined Types:
enum PNP_VETO_TYPE : int
{
PNP_VetoTypeUnknown = 0,
PNP_VetoLegacyDevice = 1,
PNP_VetoPendingClose = 2,
PNP_VetoWindowsApp = 3,
PNP_VetoWindowsService = 4,
PNP_VetoOutstandingOpen = 5,
PNP_VetoDevice = 6,
PNP_VetoDriver = 7,
PNP_VetoIllegalDeviceRequest = 8,
PNP_VetoInsufficientPower = 9,
PNP_VetoNonDisableable = 10,
PNP_VetoLegacyDriver = 11,
PNP_VetoInsufficientRights = 12
}
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
CM_Query_And_Remove_SubTree has the same signature.
CM_Request_Device_Eject_NoUi also can be used to eject a device. It has the same signature too.
This is not the correct signature for 64-bit Windows...
Tips & Tricks:
Please add some!
Sample Code:
// Assuming have IntPtr devinst already
//
// static readonly int CR_SUCCESS = 0x00000000; // cfgmgr32.h
// static readonly int DN_REMOVABLE = 0x00004000; // cfg.h
if (CR_SUCCESS == CM_Get_DevNode_Status(ref status, ref problem, devinst, 0) && (DN_REMOVABLE & status) > 0)
{
PNP_VETO_TYPE pnp_veto_type;
System.Text.StringBuilder sb = new System.Text.StringBuilder(255);
bool success = (CR_SUCCESS == CM_Request_Device_Eject(devinst, out pnp_veto_type, sb, sb.Capacity, 0));
}
Sample Code:
public string Eject(bool allowUI)
{
if (!allowUI)
{
CM_Request_Device_Eject_NoUi((int)USBData.DevInst, IntPtr.Zero, null, 0, 0); // USBData, a SP_DEVINFO_DATA structure.
}
else
{
StringBuilder sb = new StringBuilder(1024);
PNP_VETO_TYPE veto; // PNP_VETO_TYPE enumeration is used to identify the reason for rejection
int hr = CM_Request_Device_Eject((int)USBData.DevInst, out veto, sb, sb.Capacity, 0);
if (hr != 0)
throw new Win32Exception(hr);
if (veto != PNP_VETO_TYPE.Ok)
return veto.ToString();
}
return null;
}
