C# Signature:
[DllImport(@"setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern Boolean SetupDiGetDeviceInterfaceDetail(
IntPtr hDevInfo,
ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData,
ref SP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData,
UInt32 deviceInterfaceDetailDataSize,
ref UInt32 requiredSize,
ref SP_DEVINFO_DATA deviceInfoData
);
VB Signature:
Public Declare Auto Function SetupDiGetDeviceInterfaceDetail2 Lib "setupapi.dll" Alias "SetupDiGetDeviceInterfaceDetailW" ( _
ByVal hDevInfo As IntPtr, _
ByRef deviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _
ByRef deviceInterfaceDetailData As SP_DEVICE_INTERFACE_DETAIL_DATA, _
ByVal deviceInterfaceDetailDataSize As Int32, _
ByRef requiredSize As Int32, _
ByRef deviceInfoData As SP_DEVINFO_DATA) As Boolean
VB.net Signature
Public Declare Auto Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll" ( _
ByVal DeviceInfoSet As IntPtr, _
ByRef DeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _
ByRef DeviceInterfaceDetailData As SP_DEVICE_INTERFACE_DETAIL_DATA, _
ByVal DeviceInterfaceDetailDataSize As UInteger, _
ByRef RequiredSize As UInteger, _
ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean '
C# User-Defined Types:
SP_DEVICE_INTERFACE_DETAIL_DATA
VB User-Defined Types:
SP_DEVICE_INTERFACE_DETAIL_DATA
VB.net User-Defined Types:
SP_DEVICE_INTERFACE_DETAIL_DATA
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
SP_DEVICE_INTERFACE_DETAIL_DATA needs a ByVal TCHAR[ANYSIZE_ARRAY] member, which could conceivably be any size. This does not bode well for determining the correct size, however DevicePath should be no longer than MAX_PATH (256).
Tips & Tricks:
On the VB side i could not get a valid result passing nulls to the optional parameters, but passing initialized structures seems to work fine.
Sample Code:
Guid DiskGUID = new Guid(GUID_DEVINTERFACE_DISK);
// We start at the "root" of the device tree and look for all
// devices that match the interface GUID of a disk
IntPtr h = SetupDiGetClassDevs(ref DiskGUID, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (h.ToInt32() != INVALID_HANDLE_VALUE)
{
bool Success = true;
int i = 0;
while (Success)
{
// create a Device Interface Data structure
SP_DEVICE_INTERFACE_DATA dia = new SP_DEVICE_INTERFACE_DATA();
dia.cbSize = Marshal.SizeOf(dia);
// start the enumeration
Success = SetupDiEnumDeviceInterfaces(h, IntPtr.Zero, ref DiskGUID, i, ref dia);
if (Success)
{
// build a DevInfo Data structure
SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();
da.cbSize = Marshal.SizeOf(da);
// build a Device Interface Detail Data structure
SP_DEVICE_INTERFACE_DETAIL_DATA didd = new SP_DEVICE_INTERFACE_DETAIL_DATA();
if (IntPtr.Size == 8) // for 64 bit operating systems
didd.cbSize = 8;
else
didd.cbSize = 4 + Marshal.SystemDefaultCharSize; // for 32 bit systems
// now we can get some more detailed information
uint nRequiredSize = 0;
int nBytes = BUFFER_SIZE;
if (SetupDiGetDeviceInterfaceDetail(h, ref dia, ref didd, nBytes, ref nRequiredSize, ref da))
{
// current InstanceID is at the "USBSTOR" level, so we
// need up "move up" one level to get to the "USB" level
IntPtr ptrPrevious;
CM_Get_Parent(out ptrPrevious, da.DevInst, 0);
// Now we get the InstanceID of the USB level device
IntPtr ptrInstanceBuf = Marshal.AllocHGlobal(nBytes);
CM_Get_Device_ID(ptrPrevious, ptrInstanceBuf, nBytes, 0);
string InstanceID = Marshal.PtrToStringAuto(ptrInstanceBuf);
Marshal.FreeHGlobal(ptrInstanceBuf);
}
}
}
i++;
}
SetupDiDestroyDeviceInfoList(h);
Sample Code:
'goes through all devices matching the HID guid and finds one with a registry entry string matching the name of the desired HID device, in this case a Midi device
Public Enum Reg_Types
REG_SZ = 1
REG_BINARY = 3
REG_DWORD = 4
REG_MULTI_SZ = 7
End Enum
Function findMIDIKeyAndDescriptor() As Boolean
Dim devEnumInterfaceResult, devDetailResult, devEnumResult, destructionResult, registryPropertyResult As Boolean
Dim reqedBuffer As UInteger
Dim foundIt As Boolean
Dim startRow, searchStringPos As Integer
Dim loopSafety As Integer
Dim myGuid As Guid
Dim strTemp, errorString, ControllerDeviceDesc, ControllerDriverKey As String
Dim h, midih As IntPtr
Dim da, da2 As SP_DEVINFO_DATA
Dim dia As SP_DEVICE_INTERFACE_DATA
Dim didd As SP_DEVICE_INTERFACE_DETAIL_DATA = Nothing
Dim dwChars, errorCode As Long
Dim bufptr As IntPtr = IntPtr.Zero
Dim count, i, j As Integer
Dim MidiDevName As String
MidiDevName = "inputwave"
loopSafety = 2000
Call HidD_GetHidGuid(myGuid)
h = SetupDiGetClassDevs(myGuid, 0, IntPtr.Zero, DIGCF_PRESENT + DIGCF_DEVICEINTERFACE) '
da.cbSize = SizeOf(da)
dia.cbSize = SizeOf(dia)
didd.cbSize = 6 '+' Marshal.SystemDefaultCharSize + Sizeof(intptr.zero)
devEnumResult = True
devEnumInterfaceResult = True
reqedBuffer = 0
i = -1
foundIt = False
Do While devEnumResult And i < loopSafety And devEnumInterfaceResult And Not foundIt
i = i + 1
devEnumResult = SetupDiEnumDeviceInfo(h, i, da)
errorCode = Err.LastDllError
devEnumInterfaceResult = SetupDiEnumDeviceInterfaces(h, IntPtr.Zero, myGuid, i, dia)
If errorCode Then
errorString = ErrorDescriptionDLL(errorCode)
errorCode = 0
End If
If devEnumInterfaceResult And devEnumResult Then
devDetailResult = SetupDiGetDeviceInterfaceDetail(h, dia, didd, 1000, reqedBuffer, da)
'reqedBuffer turns out as 170, this will be diffent on different machines/OS,
'1000 is used as an arbitrarly large number, i found that if this was too small then I would get an error
errorCode = Err.LastDllError
devDetailResult = SetupDiGetDeviceInterfaceDetail(h, dia, didd, reqedBuffer, reqedBuffer, da)
If devDetailResult Then
Dim RegType As UInt32 = Reg_Types.REG_SZ
Dim RequiredSize As UInt32
Dim KeyName As String = ""
Dim ptrButter As IntPtr
ptrButter = Marshal.AllocHGlobal(40)
'get the right buffer size for the device description
registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DEVICEDESC, RegType, ptrButter, 0, RequiredSize)
ptrButter = Marshal.AllocHGlobal(CInt(RequiredSize))
registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DEVICEDESC, RegType, ptrButter, RequiredSize, RequiredSize)
If registryPropertyResult Then
ControllerDeviceDesc = Marshal.PtrToStringAuto(ptrButter, RequiredSize)
End If
'get the right buffer size for returning the driver key
registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DRIVER, RegType, ptrButter, RequiredSize, RequiredSize)
ptrButter = Marshal.AllocHGlobal(CInt(RequiredSize))
registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DRIVER, RegType, ptrButter, RequiredSize, RequiredSize)
If registryPropertyResult Then
ControllerDriverKey = Marshal.PtrToStringAuto(ptrButter, RequiredSize)
searchStringPos = InStr(didd.DevicePath, MidiDevName)
If searchStringPos > 0 Then
foundIt = True
End If
End If
errorCode = Err.LastDllError
Else
errorCode = Err.LastDllError
End If
End If
errorCode = Err.LastDllError
Loop
destructionResult = SetupDiDestroyDeviceInfoList(h)
If foundIt Then
findMIDIKeyAndDescriptor = True
Else
findMIDIKeyAndDescriptor = False
End If
End Function
