I'm trying to find the vendor id and the product id of a USB card. For this purpose, I use setupapi.dll. In my code, I use the SetupDiGetDeviceInterfaceDetail call twice and on the second time, the function returns true with no error, but I don't know what I can do after that.
My code:
result = HidD_GetHidGuid(ref HidGuid);
DeviceInfoSet = SetupDiGetClassDevs(ref HidGuid, IntPtr.Zero, IntPtr.Zero, 18);
do
{
SP_DEVICE_INTERFACE_DATA MyDeviceInterfaceData = new SP_DEVICE_INTERFACE_DATA();
MyDeviceInterfaceData.cbSize = 28;
result = SetupDiEnumDeviceInterfaces(DeviceInfoSet, IntPtr.Zero, ref HidGuid,
MemberIndex, ref MyDeviceInterfaceData);
if (result != 0)
{
result = SetupDiGetDeviceInterfaceDetail(DeviceInfoSet, ref MyDeviceInterfaceData,
IntPtr.Zero, 0, out neededSize, IntPtr.Zero);
//int lastError = Marshal.GetLastWin32Error();
int requiredSize = (int)neededSize;
// build a DevInfo Data structure
SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();
da.cbSize = Marshal.SizeOf(da);
SP_DEVICE_INTERFACE_DETAIL_DATA MyDeviceInterfaceDetailData = new
SP_DEVICE_INTERFACE_DETAIL_DATA();
if (IntPtr.Size == 8) // for 64 bit operating systems
MyDeviceInterfaceDetailData.cbSize = 8;
else
MyDeviceInterfaceDetailData.cbSize = 4 + Marshal.SystemDefaultCharSize;
// for 32 bit systems
IntPtr detailDataBuffer = Marshal.AllocHGlobal(requiredSize);
Marshal.StructureToPtr(MyDeviceInterfaceDetailData, detailDataBuffer, false);
result = SetupDiGetDeviceInterfaceDetail(DeviceInfoSet, ref MyDeviceInterfaceData,
detailDataBuffer, requiredSize, out neededSize, IntPtr.Zero);
int lastError = Marshal.GetLastWin32Error();
When I try the following code, the result is "-" :
string instanceID = Marshal.PtrToStringAuto(detailDataBuffer);
How can I get the vendor ID and the product ID?
