GetInstallDir　メソッド

// C++ sample
// 間取りアプリケーションへ接続
CMadoriApp * m_MadoriApp= new CMadoriApp();
CLSIDFromProgID (L"MyHomeDesignerMadori.MadoriApp", &clsid);
GetActiveObject (clsid, NULL, &pUnk);
pUnk->QueryInterface (IID_IDispatch, (void**)(&pDisp));
m_MadoriApp->AttachDispatch (pDisp);

// ディレクトリパス取得
CString strDir = m_MadoriApp->GetInstallDir();

// JavaScript sample
var app = new CMadoriApp();
var path = app.GetInstallDir();
alert(path);