Library crashes on native methods call

[pingvincible]

Hi, I have Windows 8.1 professional OS. I've downloaded UsbEject library and created simple winforms project. And I have lots of errors with native method calls. One of error is "The supplied user buffer is not valid for the requested operation" when calling

Native.SetupDiGetDeviceInterfaceDetail(_deviceInfoSet, interfaceData, buffer ,size, ref size, devData)
in DeviceClass.

I tried x86, x64, AnyCPU configurations and I got different errors on different native function calls.

Can you help me with this?

[aliaga-d]

See:
https://stackoverflow.com/a/30981402/4451521 (copy this address to your browser, I don't know why it does not jump to stackoverflow)
What I basically did was this (before the call to SetupDiGetDeviceInterfaceDetail

IntPtr buffer = Marshal.AllocHGlobal(size);  //allocates memory
                        //  Native.SP_DEVICE_INTERFACE_DETAIL_DATA detailData = new Native.SP_DEVICE_INTERFACE_DETAIL_DATA();  //This NEEDS to be replaced
                        //  detailData.cbSize = Marshal.SizeOf(detailData);  //this NEEDS to be replaced

                        //  Marshal.WriteInt32(buffer, IntPtr.Size);  //<-- this ALSO NEEDS to be replaced
                        //Marshal.StructureToPtr(detailData, buffer, false);  // Marshals data from a managed object to an unmanaged block of memory
                                                                      //false does not erase the data and can lead to a memory leak

                        Marshal.WriteInt32(buffer,(IntPtr.Size==4)?(4+Marshal.SystemDefaultCharSize):8);  //writes a 32 bit signed integer value into an unmanaged memory  
                        //You don't want to write the returned size. Per MSDN: The cbSize member always contains the size of the
                        //fixed part of the data structure, not a size reflecting the variable-length string at the end. That line should 
                        //https://stackoverflow.com/questions/30981181/c-sharp-usb-driver-from-c-setupdigetdeviceinterfacedetail

hope it helps