• AJA Video Systems

  Error during marshaling in C# project to access KONA card SDK

  Posted by Uday Mahajan on December 16, 2015 at 12:15 pm

  Hi,

  We are using marshaling to call AJA Kona card’s SDK C++ functions to C#.Net

  For marshaling we used the code to call functions are as below,

  const string _dllLocation = @”E:\UdayWork\WpfTestCPPDLL\WpfTestCPPDLL\bin\Debug\classesDLL_64d.dll”;

  [DllImport(_dllLocation, EntryPoint = “?GetDisplayName@CNTV2Card@@UEAA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ”, SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]

  public static extern string GetDisplayName();

  From main app, we are accessing as,

  string str = GetDisplayName();

  getting error as
  An exception of type ‘System.AccessViolationException’ occurred in WpfTestCPPDLL.exe and wasn’t handled before a managed/native boundary

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

  Please let us know, how to call functions from DllImport?

  Regards

  Uday

  Uday Mahajan replied 10 years, 6 months ago 1 Member · 0 Replies
• 0 Replies

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