Named Pipes OVERLAPPED structure - possible?

terminalstat 2018.11.17 21:57

Hi, all.

I want my named pipes to be asynchronous. So I need to use _OVERLAPPED structure as a buffer.

here is MSDN description of process: https://msdn.microsoft.com/en-us/50f6680f-900e-4411-a849-ec9a911c9e32

My current implementation does not even compile:

//-MS Types:
#define  PVOID int
#define HANDLE int
#define ULONG_PTR long
#define DWORD int

class STRUCT_OVERLAPPED {
  ULONG_PTR Internal;
  ULONG_PTR InternalHigh;
  union DUMMYUNIONNAME{
    struct DUMMYSTRUCTNAME{
      DWORD Offset;
      DWORD OffsetHigh;
    } ;
    PVOID _Pointer;
  } ;
  HANDLE    hEvent;
};

#import "kernel32.dll"
int ConnectNamedPipe(int hNamedPipe,STRUCT_OVERLAPPED* &lpOverlapped);
#import

with error:

'lpOverlapped' - invalid parameter for import function  NamedPipes_DLLWrapper_Async.mqh 98      56

I know that according to MQL4 Reference:

The following can't be used for parameters in imported functions:

    pointers (*);
    links to objects that contain dynamic arrays and/or pointers.

Classes, string arrays or complex objects that contain strings and/or dynamic arrays of any types cannot be passed as a parameter to functions imported from DLL.

But may be there is some kind of workaround to get it work?

PS: I know Memory mapped files, mail slots, sockets aso, but want to study exactly current implementation in academic interest, thanks