The C++ project must somewhere include the following line, in order to pull in the CoClass and Interface definitions for the wrapper object:

#import "IDLexFoo.tlb" no_namespace no_implementation raw_interfaces_only named_guids

For details about the object parameters, see Sample IDL Object.

Initiation Without Parameters in C++

Use the following code to initialize the object with no parameters.

CComPtr<IIDLexFoo> spFoo;
 
if ( FAILED(spFoo.CoCreateInstance(  uuidof(IDLexFoo)) || !spFoo)) return E_FAIL;
 
CComVariant vtNULL(0);
HRESULT hr = spFoo->CreateObject(0,vtNULL,vtNULL);
if ( FAILED(hr) )
{
  CComBSTR bstrErr;
  spFoo->GetLastError(&bstrErr);
  return E_FAIL;
}

Initiation with Parameters in C++

Use the following code to initialize the object with its three parameters (a string, a 32-bit long value, and an array that has two rows and three columns, containing 32- bit long values).

CComPtr<IIDLexFoo> spFoo;
 
if ( FAILED(spFoo.CoCreateInstance(  uuidof(IDLexFoo)) || !spFoo)) return E_FAIL;
 
CComSafeArrayBound bound[2];
bound[0].SetLowerBound(0);
bound[0].SetCount(2); // two rows
bound[1].SetLowerBound(0);
bound[1].SetCount(3); // three cols
 
CComSafeArray<VARIANT> parmArr(bound,2);
 
long	ndx[2];
long lData[2][3] = { {10, 11, 12}, {20, 21, 22} };
for ( int i = 0; i < 2; i++ ) // row
{
  for ( int j = 0; j < 3; j++ )  // col
  {
  ndx[0] = i; ndx[1] = j;
  parmArr.MultiDimSetAt(ndx, CComVariant(lData[i][j]));
  }
}
CComBSTR	parmStr = "I am a string parameter";
CComVariant parmVal = (long)24;
 
CComSafeArray<VARIANT> argval(3);
CComSafeArray<long>	argpal(3);
 
argval[0] = parmStr;
 argpal[0] = IDLBML_PARMFLAG_CONST;
argval[1] = parmVal;
 argpal[1] = IDLBML_PARMFLAG_CONST;
argval[2] = parmArr;
 argpal[2] = IDLBML_PARMFLAG_CONST | IDLBML_PARMFLAG_CONVMAJORITY;
 
long argc = 3;
CComVariant vargval = argval;
CComVariant vargpal = argpal;
 
HRESULT hr = spFoo->CreateObject(argc,vargval,vargpal);
if ( FAILED(hr) )
{
  CComBSTR bstrErr;
  spFoo->GetLastError(&bstrErr);
  return E_FAIL;
}