Managed C++/CLI

<br />
[DllImport("kernel32.dll", SetLastError = true)]<br />
extern bool DeviceIoControl(IntPtr hDevice, int dwIoControlCode, IntPtr lpInBuffer, int nInBufferSize, IntPtr lpOutBuffer, int nOutBufferSize, int %lpBytesReturned, IntPtr lpOverlapped);<br />
<br />
[StructLayout(LayoutKind::Sequential)]<br />
public ref struct OPEN_FILE_INFORMATION<br />
{<br />
	UInt64 FileSize;<br />
	bool ReadOnly;<br />
    UInt16 FileNameLength;<br />
	[MarshalAs(UnmanagedType::ByValArray, SizeConst=1)]<br />
    String ^FileName;<br />
};<br />
<br />
public: void Mount(void)<br />
{<br />
<br />
...........<br />
<br />
OPEN_FILE_INFORMATION ^OpenFileInformation = gcnew OPEN_FILE_INFORMATION();<br />
		<br />
String ^ImagePath = this->AppPath + "\\VirtualDisk.disk";<br />
int structSize = Marshal::SizeOf(OPEN_FILE_INFORMATION::typeid);<br />
int totalStructSize = structSize + ImagePath->Length;<br />
<br />
OpenFileInformation->FileSize = 8388608; // 8 MB<br />
OpenFileInformation->ReadOnly = false;<br />
OpenFileInformation->FileNameLength = ImagePath->Length;<br />
OpenFileInformation->FileName = ImagePath;<br />
<br />
IntPtr ofiPtr = Marshal::AllocHGlobal(totalStructSize);<br />
Marshal::StructureToPtr(OpenFileInformation, ofiPtr, true);<br />
<br />
cli::array<unsigned char, 1> ^tokens = Text::Encoding::Unicode->GetBytes(ImagePath);<br />
<br />
int offset = 11;<br />
<br />
for each (unsigned char c in tokens)<br />
{<br />
    Marshal::WriteByte(ofiPtr, offset, c);<br />
    offset++;<br />
}<br />
<br />
if (!DeviceIoControl(Device, IOCTL_FILE_DISK_OPEN_FILE, ofiPtr, totalStructSize - 1, IntPtr::Zero, 0, BytesReturned, IntPtr::Zero))<br />
{<br />
	DefineDosDevice(DDD_REMOVE_DEFINITION, DriveLetter + ":", nullptr);<br />
}<br />
<br />
Marshal::FreeHGlobal(ofiPtr);<br />
}<br />

private: System::Void FrmMain_HelpRequested(System::Object^  sender, System::Windows::Forms::HelpEventArgs^  hlpevent) 
{
  Point pt = this->PointToClient(hlpevent->MousePos);
  Control^ requestingControl = dynamic_cast<control^>(sender);
  Control ^ctrl = this->GetChildAtPoint(pt);
  Control ^ctrl2 = this->ActiveControl;  
  if( File::Exists(this->helpProvider->HelpNamespace ) == true)
  {
    Help::ShowHelp(this, this->helpProvider->HelpNamespace);
  }
}</control^>