AE安装检测（C++）

在MFC中使用AE(AO)进行二次开发时，当目标机器上若没有安装AE的Runtime，程序会直接挂掉。

对此，通过在CXXApp的InitInstance()的起始处增加环境的检测代码，来友好地提示用户安装AE的Runtime。

代码如下：

BOOL CMap2DApp::InitInstance()
{
    CoInitialize(NULL);

    try
    {
        IAoInitializePtr ipAoInitialize(CLSID_AoInitialize);
        if (ipAoInitialize==NULL)
        {
            MessageBox(NULL,"请先安装ArcGIS Engine Runtime!","Map 2D",MB_OK|MB_ICONEXCLAMATION);
            CoUninitialize();
            return FALSE;
        }
        esriLicenseStatus licenseStatus;
        HRESULT hr = ipAoInitialize->Initialize(esriLicenseProductCodeEngine,&licenseStatus);
        
        if (licenseStatus!=esriLicenseCheckedOut)
        {
            MessageBox(NULL,"请先安装ArcGIS Engine Runtime!","Map 2D",MB_OK|MB_ICONEXCLAMATION);
            CoUninitialize();
            return FALSE;
        }
    }
    catch (...)
    {
        MessageBox(NULL,"请先安装ArcGIS Engine Runtime!","Map 2D",MB_OK|MB_ICONEXCLAMATION);
        CoUninitialize();
        return FALSE;
    }
}