memory mapped file questions

[faustf]

hi guys  i have  in  c#  a code for memory mapped file (without file )

using System;
using System.IO;
using System.IO.MemoryMappedFiles;
using System.Threading;

class Program
{
    // Process B:
    static void Main(string[] args)
    {
        try
        {
            using (MemoryMappedFile mmf = MemoryMappedFile.OpenExisting("Test"))
            {

                Mutex mutex = Mutex.OpenExisting("testmapmutex");
                mutex.WaitOne();

                using (MemoryMappedViewStream stream = mmf.CreateViewStream(1, 0))
                {
                    BinaryWriter writer = new BinaryWriter(stream);
                    writer.Write("0");
                }
                mutex.ReleaseMutex();
            }
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("Memory-mapped file does not exist. Run Process A first.");
        }
    }
}

exist a mode  for read  by Autoit  ??

or  exist some documentation i find only this  but  is  old  and  give me rror in dll

thankz  at all

 

[Nine]

Help file : _WinAPI_CreateFileMapping ()

[faustf]

o thankz  i try to catch  a memory mapped  file  C# , in autoit    build  this  simple  code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO.MemoryMappedFiles;

namespace csharpmapmem1
{
    class Program
    {
        static void Main()
        {
            byte[] Buffer = ASCIIEncoding.ASCII.GetBytes("35;2020.06.26 10.00.01;ASK;1,12445;1");
            MemoryMappedFile mmf = MemoryMappedFile.CreateNew("Test", 1000);
            MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();
            accessor.Write(54, (ushort)Buffer.Length);
            accessor.WriteArray(54 + 2, Buffer, 0, Buffer.Length);
            Console.WriteLine("Memory mapped file created");
            Console.ReadLine();
            accessor.Dispose();
            mmf.Dispose();                
        }
    }
}

for  Autoit

#NoTrayIcon

#include <MsgBoxConstants.au3>
#include <WinAPIFiles.au3>
#include <WinAPIHObj.au3>

Opt('WinWaitDelay', 0)

 _Receiver()


Func _Receiver()
    Local $hMapping = _WinAPI_OpenFileMapping('Test')
    If Not $hMapping Then Return

    Local $pAddress = _WinAPI_MapViewOfFile($hMapping)
    Local $tData = DllStructCreate('USHORT[1000]', $pAddress)
    Local $sText

        Sleep(2000)
        $sText = DllStructGetData($tData, 1)
        DllStructSetData($tData, 1, '')
        If $sText Then MsgBox(BitOR($MB_ICONINFORMATION, $MB_SYSTEMMODAL),   " (receiver)", "                                               " & @CRLF & $sText)

    _WinAPI_UnmapViewOfFile($pAddress)
    _WinAPI_CloseHandle($hMapping)
EndFunc   ;==>_Receiver

i  run   the  first C# code  and  after run a  autoit code  , but  not  appear nothing  and  not return error

whats  wrong ???

thankz at all

[Danyfirex]

Hello. 

Just Make sure to review your code deeply.

 

#NoTrayIcon

#include <MsgBoxConstants.au3>
#include <WinAPIFiles.au3>
#include <WinAPIHObj.au3>

Opt('WinWaitDelay', 0)

_Receiver()


Func _Receiver()
    Local $hMapping = _WinAPI_OpenFileMapping('Test')
    If Not $hMapping Then Return

    Local $pAddress = _WinAPI_MapViewOfFile($hMapping)
    Local $tData = DllStructCreate('byte[1000]', $pAddress)
    Sleep(2000)
    Local $bText = DllStructGetData($tData, 1) ;Get Text in Binary
    Local $tStr = DllStructCreate("char Str[100]", $pAddress + 56) ;Address+Offset where you write from C# //accessor.WriteArray(54 + 2, Buffer, 0, Buffer.Length);
    If $bText Then MsgBox(BitOR($MB_ICONINFORMATION, $MB_SYSTEMMODAL), "Show Binary (receiver)",  $bText)
    If $tStr.Str Then MsgBox(BitOR($MB_ICONINFORMATION, $MB_SYSTEMMODAL), "Show Text (receiver)", $tStr.Str)

    _WinAPI_UnmapViewOfFile($pAddress)
    _WinAPI_CloseHandle($hMapping)
EndFunc   ;==>_Receiver

 

Saludos

[Nine]

Couple of small issues  I  foresee:

1-  Sender needs to close handle when file map is not required anymore 

2-  Receiver should erase content of the file map after reading so sender knows that content has been well received

[faustf]

2 hours ago, Danyfirex said:

Local $tData = DllStructCreate('byte[1000]', $pAddress)

why you use here  byte ?

and why you use ?

2 hours ago, Danyfirex said:

"char Str[100]

 

43 minutes ago, Nine said:

Couple of small issues  I  foresee:

1-  Sender needs to close handle when file map is not required anymore 

2-  Receiver should erase content of the file map after reading so sender knows that content has been well received

yes  of course  , but  first  i must  understund  how work memory mapp.

the  finel plan is  program A  in c#  put out  a tream of data continuosly , and  my program in Autoit  read them  in realtime and  do somthing

but a  step at time :) thankz at all

 

[Nine]

3 minutes ago, faustf said:

why you use here  byte ?

and why you use ?

Because if you do not use byte or char or wchar, you will get only the first element of the array structure and not all the content of the array.

[faustf]

questions  i try to understund i   insert a  mem file in this scritp in c#

expandcollapse popup

#region Using declarations
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Xml.Serialization;
using NinjaTrader.Cbi;
using NinjaTrader.Gui;
using NinjaTrader.Gui.Chart;
using NinjaTrader.Gui.SuperDom;
using NinjaTrader.Gui.Tools;
using NinjaTrader.Data;
using NinjaTrader.NinjaScript;
using NinjaTrader.Core.FloatingPoint;
using NinjaTrader.NinjaScript.DrawingTools;
using System.IO;
using System.IO.MemoryMappedFiles;
#endregion

//This namespace holds Indicators in this folder and is required. Do not change it. 
namespace NinjaTrader.NinjaScript.Indicators
{
    public class Aziocane : Indicator
    {
        MemoryMappedFile    file;
        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                                 = @"Enter the description for your new custom Indicator here.";
                Name                                        = "Aziocane";
                Calculate                                   = Calculate.OnBarClose;
                IsOverlay                                   = false;
                DisplayInDataBox                            = true;
                DrawOnPricePanel                            = true;
                DrawHorizontalGridLines                     = true;
                DrawVerticalGridLines                       = true;
                PaintPriceMarkers                           = true;
                ScaleJustification                          = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                //Disable this property if your indicator requires custom values that cumulate with each new market data event. 
                //See Help Guide for additional information.
                IsSuspendedWhileInactive                    = true;
            }
            else if (State == State.Configure)
            {
                    file    = MemoryMappedFile.CreateOrOpen("Test", 1000,  MemoryMappedFileAccess.ReadWrite);
            }
            else if (State == State.Terminated)
            {
                file.Dispose();
            }
        }

        protected override void OnBarUpdate()
        {
            //Add your custom indicator logic here.
            byte[] data = Encoding.UTF8.GetBytes ("This is a test vvvvvvvvvvvvv");
             
            
                using (MemoryMappedViewAccessor accessor = file.CreateViewAccessor())
                {
                    accessor.Write(0,data.Length);
             
                }
        }
    }
}

and try to catch with this script in autoit but  return me all zero Show Binary (receiver) 0x1c000.... and not return text

#NoTrayIcon

#include <MsgBoxConstants.au3>
#include <WinAPIFiles.au3>
#include <WinAPIHObj.au3>
#include <WinAPIError.au3>


Opt('WinWaitDelay', 0)

_Receiver()


Func _Receiver()
    Local $hMapping = _WinAPI_OpenFileMapping('Test')
    If $hMapping = 0 Then
        MsgBox(0, '', _WinAPI_GetLastErrorMessage())
    EndIf
    If Not $hMapping Then Return

    Local $pAddress = _WinAPI_MapViewOfFile($hMapping)
    ;ConsoleWrite("Demade " & $pAddress & @CRLF)
    Local $tData = DllStructCreate('byte[1000]', $pAddress)
    Sleep(2000)
    Local $bText = DllStructGetData($tData, 1) ;Get Text in Binary
    Local $tStr = DllStructCreate("char Str[100]", $pAddress + 56) ;Address+Offset where you write from C# //accessor.WriteArray(54 + 2, Buffer, 0, Buffer.Length);
    If $bText Then MsgBox(BitOR($MB_ICONINFORMATION, $MB_SYSTEMMODAL), "Show Binary (receiver)", $bText)
    If $tStr.Str Then MsgBox(BitOR($MB_ICONINFORMATION, $MB_SYSTEMMODAL), "Show Text (receiver)", $tStr.Str)

    _WinAPI_UnmapViewOfFile($pAddress)
    _WinAPI_CloseHandle($hMapping)
EndFunc   ;==>_Receiver

whats wrong ?

[KaFu]

Is there a loop in you c# code? Afaik the memory mapped files only lives as long as a process has an open handle on it.

[faustf]

  protected override void OnBarUpdate()
        {

when the  bar is  update  do it

  byte[] data = Encoding.UTF8.GetBytes ("This is a test vvvvvvvvvvvvv");
             
            
                using (MemoryMappedViewAccessor accessor = file.CreateViewAccessor())
                {
                    accessor.Write(0,data.Length);
             
                }

 

when  attach the indicator  over the chart ( only one time )

else if (State == State.Configure)
            {
                    file    = MemoryMappedFile.CreateOrOpen("Test", 1000,  MemoryMappedFileAccess.ReadWrite);
            }
         

when  remove  the indicator over chart (only one time )

  else if (State == State.Terminated)
            {
                file.Dispose();
            }

therfore  i  suppose  when barupdate rewrite  the file  like a stream , i suppose , but problably not understund  good

 

[KaFu]

$pAddress is a pointer in receiver (= file mapping successful)?

Try StringToBinary($bText) instead of the new structure. > Edit: BinaryToString($bText) of course 🤐

Edited June 29, 2020 by KaFu

[faustf]

8 minutes ago, KaFu said:

Try StringToBinary($bText) instead of the new structure.

but  with this

Local $bText = DllStructGetData($tData, 1) ;Get Text in Binary

convert  text in binary  why i must convert again ??

or  you intend somthing like this ?

    Local $bText = StringToBinary($tData) ;Get Text in Binary

 

[KaFu]

$sText = BinaryToString($bText)

[faustf]

i just tryed also in this mode  but nothing

[faustf]

this is a only msgbox recive

https://ibb.co/sFGKbZh

[faustf]

i tryed also in this mode  but nothing

expandcollapse popup

namespace NinjaTrader.NinjaScript.Indicators
{
    public class Aziocane : Indicator
    {
        MemoryMappedFile    file;
        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                                 = @"Enter the description for your new custom Indicator here.";
                Name                                        = "Aziocane";
                Calculate                                   = Calculate.OnBarClose;
                IsOverlay                                   = false;
                DisplayInDataBox                            = true;
                DrawOnPricePanel                            = true;
                DrawHorizontalGridLines                     = true;
                DrawVerticalGridLines                       = true;
                PaintPriceMarkers                           = true;
                ScaleJustification                          = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                //Disable this property if your indicator requires custom values that cumulate with each new market data event. 
                //See Help Guide for additional information.
                IsSuspendedWhileInactive                    = true;
            }
            else if (State == State.Configure)
            {
                MemoryMappedFile    file    = MemoryMappedFile.CreateNew("Test", 1000);
                
            }
            else if (State == State.Terminated)
            {
                file.Dispose();
            }
        }

        protected override void OnBarUpdate()
        {
            //Add your custom indicator logic here.
            byte[] data = Encoding.UTF8.GetBytes ("This is a test vvvvvvvvvvvvv");
              MemoryMappedViewAccessor accessor = file.CreateViewAccessor();
              accessor.Write(54, (ushort)data.Length);
              accessor.WriteArray(54 + 2, data, 0, data.Length);
        }
    }
}

 

[faustf]

in this mode  work (for the moment ) , thankz at all

expandcollapse popup

namespace NinjaTrader.NinjaScript.Indicators
{
    public class Aziocane : Indicator
    {
        MemoryMappedFile    file;
        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                                 = @"Enter the description for your new custom Indicator here.";
                Name                                        = "Aziocane";
                Calculate                                   = Calculate.OnBarClose;
                IsOverlay                                   = false;
                DisplayInDataBox                            = true;
                DrawOnPricePanel                            = true;
                DrawHorizontalGridLines                     = true;
                DrawVerticalGridLines                       = true;
                PaintPriceMarkers                           = true;
                ScaleJustification                          = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                //Disable this property if your indicator requires custom values that cumulate with each new market data event. 
                //See Help Guide for additional information.
                IsSuspendedWhileInactive                    = true;
            }
            else if (State == State.Configure)
            {
         file   = MemoryMappedFile.CreateOrOpen("Test", 1000,  MemoryMappedFileAccess.ReadWrite);

            }
            else if (State == State.Terminated)
            {
                file.Dispose();
            }
        }

        protected override void OnBarUpdate()
        {
            //Add your custom indicator logic here.
              byte[] data = ASCIIEncoding.ASCII.GetBytes("35;2020.06.26 10.00.01;ASK;1,12445;1");
              MemoryMappedViewAccessor accessor = file.CreateViewAccessor();
              accessor.Write(54, (ushort)data.Length);
              accessor.WriteArray(54 + 2, data, 0, data.Length);
            
        }
    }
}

 

[faustf]

hi guys  if  someone  can help me  , my script not  work in windows 10 , but  work in win 7 , so the  script  not return error but  retun i think only offset , but not a ascii text

0_o

my code

#NoTrayIcon

#include <MsgBoxConstants.au3>
#include <WinAPIFiles.au3>
#include <WinAPIHObj.au3>
#include <WinAPIError.au3>


Opt('WinWaitDelay', 0)
 while 1
_Receiver()

WEnd

Func _Receiver()
    Local $hMapping = _WinAPI_OpenFileMapping('Test')
    If $hMapping = 0 Then
        MsgBox(0, '', _WinAPI_GetLastErrorMessage())
    EndIf
    If Not $hMapping Then Return
    Local $pAddress = _WinAPI_MapViewOfFile($hMapping)
    ;ConsoleWrite("Demade " & $pAddress & @CRLF)
    Local $tData = DllStructCreate('byte[1000]', $pAddress)
    ;Sleep(2000)
    Local $bText = DllStructGetData($tData, 1) ;Get Text in Binary
    Local $tStr = DllStructCreate("char Str[100]", $pAddress + 56) ;Address+Offset where you write from C# //accessor.WriteArray(54 + 2, Buffer, 0, Buffer.Length);
    ;If $bText Then MsgBox(BitOR($MB_ICONINFORMATION, $MB_SYSTEMMODAL), "Show Binary (receiver)", $bText)
    If $tStr.Str Then ConsoleWrite ( $tStr.Str & @CRLF)

    _WinAPI_UnmapViewOfFile($pAddress)
    _WinAPI_CloseHandle($hMapping)
EndFunc   ;==>_Receiver