[C to C#] Send Structur with byte array from C# to C

[C to C#] Send Structur with byte array from C# to C

• Ben Weber

  thank you for you answer but i find an other solution that works.

  the struct :

  --------------------------------------------------------------------

  [StructLayout(LayoutKind.Sequential)]

  public struct DRVBINFO

  {

  public UInt16 wCardsNumber;

  public UInt16 wChannelsNumber;

  public IntPtr DRVBCardsAdresses;

  }

  ----------------------------------------------------------------------------------

  [DllImport("LightMng.dll", SetLastError = true)]

  static extern uint LightMngInit (DRVBINFO DRVBinfo);

  -----------------------------------------------------------------------------------

  public uint OpenDevice()

  {

  DRVBINFO DRVBinfo;

  DRVBinfo = new DRVBINFO();

  DRVBinfo.wCardsNumber = 3;

  DRVBinfo.wChannelsNumber = 12;

  DRVBinfo.DRVBCardsAdresses = Marshal.AllocCoTaskMem(3);

  Marshal.WriteByte(DRVBinfo.DRVBCardsAdresses, 0,0x00);

  Marshal.WriteByte(DRVBinfo.DRVBCardsAdresses, 1, 0x51);

  Marshal.WriteByte(DRVBinfo.DRVBCardsAdresses, 2, 0x00);

  uint Return;

  Return = LightMngInit(DRVBinfo);

  if (Return == 0) return 0;

  return 1;

  }

  --------------------------------------------------------------------------------------------------------------------

  
  

• foxman_

  HtH,

  i was trying your solution and i cannot get it to work i get this error:

  "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

  how do you actualy use the array

  [StructLayout(LayoutKind.Sequential)]
  public struct DRVBINFO
  {
  public UInt16 wCardsNumber;
  public UInt16 wChannelsNumber;
  [MarshalAs(UnmanagedType.ByValArray, SizeConst=3)]
  public byte[] myIntArray;
  }

  do you do this

  DRVBINFO tst = new DRVBINFO();

  tst.myIntArray = new byte[3] // beacuse this kind of use gives me that error or is there another way

  
  

• brian_tsim

  Hello All.

  Julien:

  Well, alrighty then. Good luck with that memory leak.

  HTH.

  
  
  

• Hans1982

  Hello All.

  Julien:

  Try this instead:

  [StructLayout(LayoutKind.Sequential)]
  public struct DRVBINFO
  {
  public UInt16 wCardsNumber;
  public UInt16 wChannelsNumber;
  [MarshalAs(UnmanagedType.ByValArray, SizeConst=3)]
  public byte[] myIntArray;
  }

  HTH.

  
  
  
• [C to C#] Send Structur with byte array from C# to C