ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH C++ AND CONTROL WIDGETS
hr = ipPict->get_Handle(&hBitmap);
if (SUCCEEDED(hr))
m_hBitmap = hBitmap;
}
}
c. In the destructor, you will clean up all the interface member variables.
AddDateTool::AddDateTool()
{
…
}
AddDateTool::~AddDateTool()
{
m_ipHookHelper = 0;
m_hBitmap = 0;
m_hCursor = 0;
}
d. You now need to stub out all the functions from ICommand in
AddDate.cpp, even if you are not going to use some of these. Add the
following code to the ICommand properties and methods:
AddDateTool::~AddDateTool()
{
…
}
HRESULT AddDateTool::get_Enabled(VARIANT_BOOL* Enabled)
{
if (!Enabled)
return E_POINTER;
*Enabled = VARIANT_TRUE;
return S_OK;
}
HRESULT AddDateTool::get_Checked(VARIANT_BOOL* Checked)
{
if (!Checked)
return E_POINTER;
return S_OK;
}
HRESULT AddDateTool::get_Name(BSTR* Name)
{
if (!Name)
return E_POINTER;
*Name = ::AoAllocBSTR(L"CustomCommands_AddDate");
return S_OK;
Chapter 6 • Developer scenarios • 395