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README
Apache-2.0

打印框架

简介

打印框架支持三方应用创建打印任务,拉起后台打印任务管理,管理打印扩展和打印任务。 提供打印扩展框架,实现三方打印扩展的接入,管理打印任务与打印机之间的关系,启动、取消打印任务,查询打印进度等。

逻辑流程如下:

首先,打印请求到打印框架,再从打印系统框架发送到打印预览界面(PrintSpooler),拉起打印预览界面到应用层。由PrintSpooler向打印服务(PrintSA)发送开启发现能力指令,再由PrintSA向打印扩展接口(PrintExtension)发送开启发现能力指令,然后PrintExtension向第三方打印扩展接口(CustomPrintExtension)发送开启发现能力发现打印机。CustomPrintExtension向打印服务(PrintServiceAbility)上报发现打印机信息并返回到PrintSpooler。由打印预览界面(PrintSpooler)发送打印任务到打印服务(PrintServiceAbility),再发送到打印扩展(PrintExtension),之后发送给第三方打印扩展(CustomPrintExtension),再发送给打印机。

图 1 部件架构图

目录

foundation/print_print_fwk        #打印框架
├── frameworks       
│   └── innerkitsimpl             # Native接口
    └── kits\extension            # 打印扩展管理
├── interfaces\kits               # 接口层代码
│   └── jsnapi                     
        └── extension             # 管理扩展生命周期接口 
        └── extensionctx          # 管理扩展上下文
│   └── napi                      # JavaScript接口
├── services                      # 服务层代码
└── test                          # 测试用例资源

约束

  • 如需使用打印框架完整功能,需要申请code ohos.permission.PRINT、ohos.permission.MANAGE_PRINT_JOB权限。

说明

部件内子模块职责说明:

  • 打印管理(Print NAPI)

    对接打印应用的JS API,负责创建打印任务,监听打印任务状态变化等接口的实现

  • 打印管理(InnerPrint NAPI)

    对接打印后台管理应用、三方打印扩展的内部JS API,负责打印机发现、预览、启动打印、监听打印机、打印任务状态变化等接口的实现

  • 打印管理客户端(Print Manager Client)

    负责打印服务在客户端的接口实现,对外(JS应用或者Native应用)提供统一的打印服务能力

  • 打印管理服务端(Print Manager Server)

    对接打印管理,接受应用的打印任务相关请求,执行权限校验,并拉起后台打印任务管理;管理系统中打印扩展。包括打印扩展的新增、移除、修改属性(已安装的、默认的、当前使用的)、查询状态、监听变化等;管理打印任务队列。包括:打印格式化数据的传递、打印任务的数据缓存等;对接使用中的打印扩展,分发和管理打印任务

  • 打印拓展(Print Extension)

    打印扩展部分需要三方厂商定制

  • 三方打印扩展(Custom Print Extension)

    打印机厂商实现具体打印功能提供

  • 打印后台管理应用(Printspooler)

    系统打印管理应用

相关仓

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