Passing a string from C# to Matlab

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Paul Martin
Paul Martin 2011-10-28
I'm calling a Matlab mcc-compiled DLL from C# and am attempting to marshall a string as an input parameter. I am using .Net PInvoke to load and call the DLL and have declared the method as follows:
public static extern void func([In]Int32 nargout, ref IntPtr h, [In][MarshalAs(UnmanagedType.LPStr)]string path);
and the call as:
string dataPath = "c:\\path\\data";
int nargout = 1;
IntPtr h = IntPtr.Zero;
func(nargout, ref h, dataPath);
This results in an exception "Attempt to read or write protected memory".
I have also tried passing a char array:
char[] tmpStr = dataPath.ToCharArray();
func(nargout, ref h, tmpStr);
And have tried using the runtime mxCreateString function: [DllImport("mclmcrrt72.dll", EntryPoint = "mxCreateString", CharSet = CharSet.Ansi)] static extern IntPtr CreateString([In][MarshalAs(UnmanagedType.LPArray)] char[] myString);
with call:
IntPtr strPtr = CreateString(myStr);
func(nargout, ref h, tmpStr);
However, the same exception is encountered.
Without the string parameter, the call succeeds.
Has anyone succeeded in doing this?
Thanks in advance.

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