private unsafe static int TryExcelImpl12(int xlFunction, out object result, params object[] parameters)
{
int xlReturn;
// Set up the memory to hold the result from the call
XlOper12 resultOper = new XlOper12();
resultOper.xlType = XlType12.XlTypeEmpty;
XlOper12 *pResultOper = &resultOper; // No need to pin for local struct
// Special kind of ObjectArrayMarshaler for the parameters (rank 1)
using (XlMarshalXlOperArrayContext paramMarshaler
= new XlMarshalXlOperArrayContext(1, true))
{
XlOper12 **ppOperParameters = (XlOper12 **)paramMarshaler.ObjectArrayReturn(parameters);
xlReturn = Excel12v(xlFunction, parameters.Length, ppOperParameters, pResultOper);
}
// pResultOper now holds the result of the evaluated function
// Get ObjectMarshaler for the return value
result = XlMarshalContext.ObjectParam((IntPtr)pResultOper);
// And free any memory allocated by Excel
Excel12v(xlFree, 1, &pResultOper, (XlOper12 *)IntPtr.Zero);
return(xlReturn);
}
internal static IntPtr RegistrationInfo(IntPtr pParam)
{
if (!_initialized)
{
return(IntPtr.Zero);
}
object param = XlMarshalContext.ObjectParam(pParam);
object regInfo = XlRegistration.GetRegistrationInfo(param);
if (regInfo == null)
{
return(IntPtr.Zero); // Converted to #NUM
}
var ctx = XlDirectMarshal.GetMarshalContext();
return(ctx.ObjectReturn(regInfo));
}