Jaco Van Deventer Jaco Van Deventer -3 years ago 290
C# Question

Delphi dll importing to C# - System.AccessViolationException DllImport

Good day. I am struggling to get the function call to my Delphi to return data. I know the dll is working because if I use a show msg inside the dll it returns the right information.

I am thinking its to do with memory sizes that aren't the same. I also read a lot about prebuffering the memory, unfortunately, I don't have the know-who to implement it into my project

Exception details:
{"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."}

Delphi function:

function doStuff({var} c:string): pchar; stdcall;


CallingConvention = CallingConvention.StdCall,
CharSet = CharSet.Unicode)]
public static extern string doStuff(string a);

static void Main(string[] args)
string q = "1234567890123456";
string a = doStuff(q);
catch (Exception)



Answer Source

Got the supplier to fix their code.

If you have the Delphi code look into CoTaskMemAlloc

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