trouble using unmanaged c++ from c# using dllimport

[alag20]

Hi guys,
i am having trouble importing c++ unmanaged dll into C# [winform]. Can someone help?



Basically i am just trying to create a safearray of strings in c++ and trying to send it to C#.



Here is my c++ code.

extern "C" __declspec(dllexport) BOOL GetStringArr(SAFEARRAY* arr)
{
SAFEARRAY* myArray;
SAFEARRAYBOUND rgsabound[1];

rgsabound[0].lLbound = 0;
rgsabound[0].cElements = 5;

myArray = SafeArrayCreate(VT_BSTR, 1, rgsabound);
VARIANT* pvData = (VARIANT*)(myArray->pvData);

pvData[0].vt = VT_BSTR;
pvData[0].bstrVal = SysAllocString(L"FirstString");
pvData[1].vt = VT_BSTR;
pvData[1].bstrVal = SysAllocString(L"SecondString");
pvData[2].vt = VT_BSTR;
pvData[2].bstrVal = SysAllocString(L"ThirdString");
pvData[3].vt = VT_BSTR;
pvData[3].bstrVal = SysAllocString(L"FourthString");
pvData[4].vt = VT_BSTR;
pvData[4].bstrVal = SysAllocString(L"FifthString");

arr = myArray;
return true;
}



Here is my c# code.

[DllImport("MyData.dll", EntryPoint = "GetStringArr")]
public static extern bool GetStringArr([MarshalAs(UnmanagedType.SafeArray)] out Array strServerList);



i am getting exception when i call GetStringArr from C#. i am sure there is something silly i am doing. Can someone please help?



Thanks in advance.

[Zaccheus]

The first thing you need to do is to declare your C function as __stdcall.