Example Code for Creating a Bindable String Representation of a GUID

The following C++ code fragment shows a function that returns a string representation of a GUID that can be used to bind to the object:

HRESULT GUIDtoBindableString (LPGUID pGUID, LPOLESTR *ppGUIDString)
{
HRESULT hr = E_FAIL;
if (!pGUID)
  return E_INVALIDARG;
//Build bindable GUID string
LPOLESTR szDSGUID = new WCHAR [128];
DWORD dwLen =  sizeof(*pGUID);
LPBYTE lpByte = (LPBYTE) pGUID;
//Copy a blank string to make it a zero length string.
wcscpy( szDSGUID, L"" );
//Loop through to add each byte to the string.
for( DWORD dwItem = 0L; dwItem < dwLen ; dwItem++ )
{
  //Append to szDSGUID, double-byte, byte at dwItem index.
  swprintf(szDSGUID + wcslen(szDSGUID), L"%02x", lpByte[dwItem]);
  if( wcslen( szDSGUID ) > 128 )
    break;
}
//Allocate memory for string
*ppGUIDString = (OLECHAR *)CoTaskMemAlloc (sizeof(OLECHAR)*(wcslen(szDSGUID)+1));
if (*ppGUIDString)
  wcscpy(*ppGUIDString, szDSGUID);
else
  hr=E_FAIL;
//Caller must free ppGUIDString using CoTaskMemFree.
return hr;
}