Question

运行“更新当前安装”选项，如何从以前的安装中获取版本信息？我一直在使用API，我见过的最接近的是public static interface ApplicationRegistry.ApplicationInfo。

修改
这就是我目前的情况。它有效但不确定这是否是最可行的方法。

import com.install4j.api.ApplicationRegistry;

ApplicationRegistry.ApplicationInfo[] AppInfo = ApplicationRegistry.getApplicationInfoById(context.getApplicationId());

return AppInfo[0].getVersion();

Answer 1

您可以使用

static ApplicationRegistry.ApplicationInfo getApplicationInfoByDir(java.io.File dir)

检查指定的目录是否包含install4j安装的应用程序并检索有关它的信息。

这将返回ApplicationInfo而不是ApplicationInfo []。

Answer 2

例如，以下脚本检查是否已安装相同的版本：

// The value returned by context.getInstallationDirectory() will be
// the last installation directory if the user has already installed the application
ApplicationRegistry.ApplicationInfo applicationInfo =
    ApplicationRegistry.getApplicationInfoByDir(context.getInstallationDirectory());

if (applicationInfo == null) {
  // The application has never been installed before
    return true;
}

// The version of this installer is contained in a system installer variable
String myVersion = (String)context.getVariable("sys.version");
if (applicationInfo.getVersion().equals(myVersion)) {
    // In that case the current version is already installed.
    Util.showErrorMessage("The current version is already installed in this directory");
    // By returning "false", the action will fail and the installer will quit.
    // Note that you have to set the "Failure strategy" property of your 
    // "Run script" action to "Quit on error", otherwise the installer will continue.
    return false;
} else {
    return true;
}

例如，这可以用于＆＃34;运行脚本＆＃34; ＆＃34; Startup＆＃34;安装程序的节点。

从以前的安装中获取版本信息

2 个答案: