Passing multi-dimensional array from C# to Win32 C++ dll?

[THY02K]

hello

I'm trying to pass multi-dimensional arrays from C# to un-managed WIN32 C++ dll - second parameter of each of the two functions exported below are meant to be OUTPUT parameter (memory allocated in C# however)

MATLABGENERICDLL_API void GetCurves(char* strParam, double * myCurve)
{
for(int i=0; i<10; i++)
{
if(i>0) {
myCurve[i] = 1.01 * Curve[i-1];
} else {
myCurve[i] = 0.5;
}
}
return;
}

MATLABGENERICDLL_API void GetMatrix(char* strParam, double ** myMatrix)
{
try {
for(int i=0; i<10; i++)
{
for(int j=0; j<10; j++)
{
myMatrix[i][j] = 0.25;
}
}
} catch( ...)
{
throw;
}

return;
}

GetCurves executed successfully, but not GetMatrix.

class Program
{
[DllImport(@"C:\MatlabGenericDll.dll")]
private static extern string ToUpper2(string Src);

[DllImport(@"C:\MatlabGenericDll.dll")]
private static extern void GetCurves(string strParam, [In, Out] double[] myCurves);

[DllImport(@"C:\MatlabGenericDll.dll")]
private static extern void GetMatrix(string strParam, [In, Out] double[,] myMatrix);

static void Main(string[] args)
{
string strTest = "abc";
string strResult = null;

double[] myCurve = null;
double[,] myMatrix = null;

try
{
strResult = ToUpper2(strTest);

myCurve= new double[100];
GetYieldCurves("AAA", myCurve); << For some reason, executed succssfully (Although I checked &myCurve - address seems to be different in C#/C++ layer so I really don't understand why it worked)

myMatrix= new double[10, 10];
GetMatrix("BBB", myMatrix); << System.AccessViolationException, complained saying memory probably corrupted.
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}

return;
}
}

I'm not sure if I am doing right thing ... allocating memory from C# layer and if C# exe and C++ dll share same address space at all.


My end goal is: I actually also need to pass, from c# exe to unmanaged C++ dll, a two-dimensional array of undetermined size of different column types (string, doubles, int, DateTime)

Thanks!



http://msdn.microsoft.com/en-us/libr...53(VS.71).aspx