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This chapter describes methods in the plug-in API that are available from the browser. The names of all of these methods begin with NPN_ to indicate that they are implemented by the browser and called by the plug-in. For an overview of how these two sides of the plug-in API interact, see the How Plug-ins Work and Overview of Plug-in Structure sections in the introduction.
本文描述了浏览器可用的插件API方法。所有的方法均已NPN_开头，用以表明它们由浏览器执行且由插件调用。了解更多浏览器和插件交互，查看How Plug-ins Work 和 Overview of Plug-in Structure 。
警告： 你仅能够在主线程中调用这些函数；在其他线程调用不仅不被支持同时还会产生无法预测的结果。
SummaryNetscape插件方法
NPN_DestroyStream- 关闭并删除一个流。
NPN_ForceRedraw- 为一个无窗口插件强制绘制消息。
NPN_GetAuthenticationInfo- 这个函数用于为插件获取浏览器的HTTP authentication 信息。
NPN_GetURL- 请求浏览器为指定的URL创建一个流。
NPN_GetURLNotify- 请求使用特定URL内容创建一个新的流；同时获取创建结果的通知。
NPN_GetValue- 允许插件询问浏览器信息。
NPN_GetValueForURL- 为插件提供URL附带的信息，比如cookies和首选代理。
NPN_InvalidateRect- Invalidates specified drawing area prior to repainting or refreshing a windowless plug-in.
NPN_InvalidateRegion- 在更新或者重绘一个无窗口插件之前使得指定的绘画区域无效。
NPN_MemAlloc- 从浏览器内存区域中分配内存。
NPN_MemFlush- 请求浏览器释放特定的内存区域。
NPN_MemFree- 重新分配已经分派的内存。
NPN_NewStream- Requests the creation of a new data stream produced by the plug-in and consumed by the browser.
NPN_PluginThreadAsyncCall- Thread-safe way to request that the browser calls a plug-in function on the browser or plug-in thread (the thread on which the plug-in was initiated).
NPN_PopPopupsEnabledState- Pops the popups-enabled state.
NPN_PostURL- Posts data to a URL.
NPN_PostURLNotify- Posts data to a URL, and receives notification of the result.
NPN_PushPopupsEnabledState- Pushes the popups-enabled state.
NPN_ReloadPlugins- Reloads all plug-ins in the Plugins directory.
NPN_RequestRead- Requests a range of bytes for a seekable stream.
NPN_SetValue- Sets windowless plug-in as transparent or opaque.
NPN_SetValueForURL- Allows a plug-in to change the stored information associated with a URL, in particular its cookies.
NPN_Status- Displays a message on the status line of the browser window.
NPN_UserAgent- Returns the browser's user agent field.
NPN_Version- Returns version information for the Plug-in API.
NPN_Write- Pushes data into a stream produced by the plug-in and consumed by the browser.