ArcGIS Engine产品开发中的许可文件初始化

       ArcGIS Engine产品以及相应的产品许可正常安装以后，为什么还要在程序中做许可文件的初始化的工作？具体怎么实现。

       解答

       ArcGIS Engine developer kit产品以及相应的产品许可安装以后，只是为你的应用程序实现许可允许的功能提供了可能性，要想真的使得你的应用程序拥有这些功能，你还需要做一个许可文件的初始化工作。

       注意：如果不做这个初始化工作，你有可能会在实现某些功能时碰到你没有相应的许可的提示。

       这个许可文件的初试化工作需要在你的应用程序的入口处实现。下面是c#的初始化的代码示例

using ESRI.ArcGIS.esriSystem;

namespace LicenseInitializer

{

public class LicenseInitializer

{

private IAoInitialize m_AoInitialize = new AoInitializeClass();

public bool InitializeApplication()

{

bool bInitialized = true;

if (m_AoInitialize == null)

{

System.Windows.Forms.MessageBox.Show("Unable to initialize. This application cannot run!";

bInitialized = false;

}

//初始化应用程序

esriLicenseStatus licenseStatus = esriLicenseStatus.esriLicenseUnavailable;

licenseStatus = CheckOutLicenses(esriLicenseProductCode.esriLicenseProductCodeEngine);

if (licenseStatus != esriLicenseStatus.esriLicenseCheckedOut)

{

licenseStatus = CheckOutLicenses(esriLicenseProductCode.esriLicenseProductCodeArcView);

if (licenseStatus != esriLicenseStatus.esriLicenseCheckedOut)

{

licenseStatus = CheckOutLicenses(esriLicenseProductCode.esriLicenseProductCodeArcEditor);

if (licenseStatus != esriLicenseStatus.esriLicenseCheckedOut)

{

licenseStatus = CheckOutLicenses(esriLicenseProductCode.esriLicenseProductCodeArcInfo);

if (licenseStatus != esriLicenseStatus.esriLicenseCheckedOut)

{

System.Windows.Forms.MessageBox.Show(LicenseMessage(licenseStatus));

bInitialized = false;

}

}

}

}

return bInitialized;

}

public void ShutdownApplication()

{

if (m_AoInitialize == null) return;

//关闭 AoInitilaize对象

m_AoInitialize.Shutdown();

m_AoInitialize = null;

}

private esriLicenseStatus CheckOutLicenses(esriLicenseProductCode productCode)

{

esriLicenseStatus licenseStatus;

//是否产品是可能的

licenseStatus = m_AoInitialize.IsProductCodeAvailable(productCode);

if (licenseStatus == esriLicenseStatus.esriLicenseAvailable)

{

//用相应的许可文件进行初始化

licenseStatus = m_AoInitialize.Initialize(productCode);

}

return licenseStatus;

}

private string LicenseMessage(esriLicenseStatus licenseStatus)

{

string message = "";

//没有许可

if (licenseStatus == esriLicenseStatus.esriLicenseNotInitialized)

{

message = "You are not licensed to run this product!";

}

//许可正在使用

else if (licenseStatus == esriLicenseStatus.esriLicenseUnavailable)

{

message = "There are insuffient licenses to run!";

}

//未知错误

else if (licenseStatus == esriLicenseStatus.esriLicenseFailure)

{

message = "Unexpected license failure! Please contact your administrator.";

}

//已经初始化

else if (licenseStatus == esriLicenseStatus.esriLicenseAlreadyInitialized)

{

message = "The license has already been initialized! Please check your implementation.";

}

return message;

}

}

}