private string GetPropertString(UInt32 deviceInstance, ConfigManagerAPI.DeviceInfo devPropInfo)
{
string property = "";
UInt32 propertyType = 0;
IntPtr buf = new IntPtr();
UInt32 bufSize = 0;
uint result = ConfigManagerAPI.CM_Get_DevNode_PropertyW(deviceInstance, ref devPropInfo, ref propertyType, buf, ref bufSize, 0);
if (result == SMALL_BAFFER && propertyType == STRING_TYPE)
{
buf = Marshal.AllocHGlobal((int)bufSize * 2);
result = ConfigManagerAPI.CM_Get_DevNode_PropertyW(deviceInstance, ref devPropInfo, ref propertyType, buf, ref bufSize, 0);
if (result == 0)
{
property = ReadNullTerminatedStringFromBuffer(buf, bufSize);
}
Marshal.FreeHGlobal(buf);
}
return(property);
}
public List <WindowsDevice> EnumerateDevices()
{
List <WindowsDevice> devices = new List <WindowsDevice>();
uint result = 0;
UInt32 size = 0; //size iz number of characters
string filter = "";
result = ConfigManagerAPI.CM_Get_Device_ID_List_SizeW(ref size, ref filter, 0);
if (result == 0)
{
IntPtr buffer = Marshal.AllocHGlobal((int)size * 2); //width of wchar is 2
UInt32 flags = 256;
result = ConfigManagerAPI.CM_Get_Device_ID_ListW(ref filter, buffer, size, flags);
if (result == 0)
{
List <Tuple <string, int> > devicesList = ParseBuffer(buffer, size);
foreach (var device in devicesList)
{
UInt32 deviceInstance = 0;
IntPtr ptrToDeviceId = IntPtr.Add(buffer, device.Item2);
result = ConfigManagerAPI.CM_Locate_DevNodeW(ref deviceInstance, ptrToDeviceId, 0);
if (result == 0)
{
string id = device.Item1;
string deviceClass = GetPropertString(deviceInstance, new ConfigManagerAPI.DeviceInfo(new Guid(DEV_INFO_DEVICE_CLASS_GUID), DEV_INFO_DEVICE_CLASS_PID));
string parent = GetPropertString(deviceInstance, new ConfigManagerAPI.DeviceInfo(new Guid(DEV_INFO_PARENT_ID_GUID), DEV_INFO_PARENT_ID_PID));
string driverVersion = GetPropertString(deviceInstance, new ConfigManagerAPI.DeviceInfo(new Guid(DEV_INFO_DRIVER_VERSION_GUID), DEV_INFO_DRIVER_VERSION_PID));
List <string> children = GetPropertStringList(deviceInstance, new ConfigManagerAPI.DeviceInfo(new Guid(DEV_INFO_CHILDREN_ID_GUID), DEV_INFO_CHILDREN_ID_PID));
WindowsDevice windowsDevice = new WindowsDevice(id, id, deviceClass, children, parent, driverVersion);
devices.Add(windowsDevice);
}
}
}
Marshal.FreeHGlobal(buffer);
}
InitializeDeviceSiblings(devices);
return(devices);
}
private List <string> GetPropertStringList(UInt32 deviceInstance, ConfigManagerAPI.DeviceInfo devPropInfo)
{
List <string> property = new List <string>();
UInt32 propertyType = 0;
IntPtr buf = new IntPtr();
UInt32 bufSize = 0;
uint result = ConfigManagerAPI.CM_Get_DevNode_PropertyW(deviceInstance, ref devPropInfo, ref propertyType, buf, ref bufSize, 0);
if (result == SMALL_BAFFER && propertyType == (STRING_TYPE + LIST_TYPE))
{
buf = Marshal.AllocHGlobal((int)bufSize * 2);
result = ConfigManagerAPI.CM_Get_DevNode_PropertyW(deviceInstance, ref devPropInfo, ref propertyType, buf, ref bufSize, 0);
if (result == 0)
{
IntPtr pointer = buf;
while (bufSize > 0)
{
string element = ReadNullTerminatedStringFromBuffer(pointer, bufSize);
if (String.IsNullOrEmpty(element))
{
break;
}
int offset = element.Length + 1;
offset *= 2;
property.Add(element);
pointer = IntPtr.Add(pointer, offset);
}
}
Marshal.FreeHGlobal(buf);
}
return(property);
}
