C# Signature:

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType, [Out]byte[] propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x02, out sbyte propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x03, out byte propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x04, out short propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x05, out ushort propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x06, out int propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x07, out uint propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x08, out long propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x09, out ulong propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x0A, out float propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x0B, out double propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x0C, out decimal propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x0D, out Guid propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x11, [MarshalAs(UnmanagedType.I1)] out bool propertyBuffer,
    ref uint propertyBufferSize, uint zeroFlags);

[DllImport("CfgMgr32.dll", CharSet = CharSet.Unicode)]
private static extern ConfigManagerResult CM_Get_DevNode_Property(uint devInst, ref DEVPROPKEY propertyKey,
    out uint propertyType_0x12, StringBuilder propertyBuffer, ref uint propertyBufferSize, uint zeroFlags);

User-Defined Types:

struct DEVPROPKEY {
     public DEVPROPKEY(Guid guid, uint pid) {
     _guid = guid;
     _pid = pid;
     }
     public Guid _guid;
     public uint _pid;
}

enum ConfigManagerResult : uint {
     Success = 0x00000000,
     Default = 0x00000001,
     OutOfMemory = 0x00000002,
     InvalidPointer = 0x00000003,
     InvalidFlag = 0x00000004,
     InvalidDevnode = 0x00000005,
     InvalidDevinst = InvalidDevnode,
     InvalidResDes = 0x00000006,
     InvalidLogConf = 0x00000007,
     InvalidArbitrator = 0x00000008,
     InvalidNodelist = 0x00000009,
     DevnodeHasReqs = 0x0000000A,
     DevinstHasReqs = DevnodeHasReqs,
     InvalidResourceid = 0x0000000B,
     NoSuchDevnode = 0x0000000D,
     NoSuchDevinst = NoSuchDevnode,
     NoMoreLogConf = 0x0000000E,
     NoMoreResDes = 0x0000000F,
     AlreadySuchDevnode = 0x00000010,
     AlreadySuchDevinst = AlreadySuchDevnode,
     InvalidRangeList = 0x00000011,
     InvalidRange = 0x00000012,
     Failure = 0x00000013,
     NoSuchLogicalDev = 0x00000014,
     CreateBlocked = 0x00000015,
     RemoveVetoed = 0x00000017,
     ApmVetoed = 0x00000018,
     InvalidLoadType = 0x00000019,
     BufferSmall = 0x0000001A,
     NoArbitrator = 0x0000001B,
     NoRegistryHandle = 0x0000001C,
     RegistryError = 0x0000001D,
     InvalidDeviceId = 0x0000001E,
     InvalidData = 0x0000001F,
     InvalidApi = 0x00000020,
     DevloaderNotReady = 0x00000021,
     NeedRestart = 0x00000022,
     NoMoreHwProfiles = 0x00000023,
     DeviceNotThere = 0x00000024,
     NoSuchValue = 0x00000025,
     WrongType = 0x00000026,
     InvalidPriority = 0x00000027,
     NotDisableable = 0x00000028,
     FreeResources = 0x00000029,
     QueryVetoed = 0x0000002A,
     CantShareIrq = 0x0000002B,
     NoDependent = 0x0000002C,
     SameResources = 0x0000002D,
     NoSuchRegistryKey = 0x0000002E,
     InvalidMachinename = 0x0000002F,   // NT ONLY
     RemoteCommFailure = 0x00000030,   // NT ONLY
     MachineUnavailable = 0x00000031,   // NT ONLY
     NoCmServices = 0x00000032,   // NT ONLY
     AccessDenied = 0x00000033,   // NT ONLY
     CallNotImplemented = 0x00000034,
     InvalidProperty = 0x00000035,
     DeviceInterfaceActive = 0x00000036,
     NoSuchDeviceInterface = 0x00000037,
     InvalidReferenceString = 0x00000038,
     InvalidConflictList = 0x00000039,
     InvalidIndex = 0x0000003A,
     InvalidStructureSize = 0x0000003B
}

Sample Code:

DEVPROPKEY key = ...;
uint propertyType;
uint propBufSize = 0;
byte[] buffer = null;
result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, buffer, ref propBufSize, 0);
if (result != ConfigManagerResult.BufferSmall) {
     throw new Exception(string.Format("Failed to retrieve property size for property {0} {1}: {2}.",
     key._guid, key._pid, result));
}
object value;
switch (propertyType) {
     case 0x02:
     sbyte v;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out v, ref propBufSize, 0);
     value = v;
     break;

     case 0x03:
     byte b;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out b, ref propBufSize, 0);
     value = b;
     break;

     case 0x04:
     short s;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out s, ref propBufSize, 0);
     value = s;
     break;

     case 0x05:
     ushort us;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out us, ref propBufSize, 0);
     value = us;
     break;

     case 0x06:
     int i;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out i, ref propBufSize, 0);
     value = i;
     break;

     case 0x07:
     uint ui;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out ui, ref propBufSize, 0);
     value = ui;
     break;

     case 0x08:
     long l;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out l, ref propBufSize, 0);
     value = l;
     break;

     case 0x09:
     ulong ul;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out ul, ref propBufSize, 0);
     value = ul;
     break;

     case 0x0A:
     float f;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out f, ref propBufSize, 0);
     value = f;
     break;

     case 0x0B:
     double d;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out d, ref propBufSize, 0);
     value = d;
     break;

     case 0x0C:
     decimal dec;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out dec, ref propBufSize, 0);
     value = dec;
     break;

     case 0x0D:
     Guid guid;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out guid, ref propBufSize, 0);
     value = guid;
     break;

     case 0x11:
     bool bo;
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, out bo, ref propBufSize, 0);
     value = bo;
     break;

     case 0x12:
     var builder = new StringBuilder((int)propBufSize);
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, builder, ref propBufSize, 0);
     value = builder;
     break;

     default:
     buffer = new byte[propBufSize];
     result = CM_Get_DevNode_Property(devInst, ref key, out propertyType, buffer, ref propBufSize, 0);
     value = "a buffer";
     break;
}
if (result != ConfigManagerResult.Success) {
     throw new Exception("Failed to retrieve property: " + result + ".");
}

Console.Out.WriteLine("Property {0} {1:x} type {2:x} = {3}.", key._guid, key._pid, propertyType, value);

Documentation:

https://msdn.microsoft.com/en-us/library/windows/hardware/hh780220.aspx

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).