昨天白天用官方示例在主机安装了FF插件，然而晚上回寝室用VS2013并没有成功，不禁想起了那句话“程序员都是好男人，他们每天都会反省自己，我又错在哪了”。
言归正传，今天的目标是阅读理解FF插件官方文档，我这菜鸡一般的英语水平勉强能应付。
一、Initialization 当一个插件加载了，在创建第一个实例之前就会调用NPError NP_Initialize(void) {};分配内存资源给所有实例使用。 对应的NP_Shutdown函数是在最后一个实例销毁糊调用，用来释放NP_Initialize分配的内存资源
/* Define global variable to hold the user agent string. */ static char* userAgent = NULL; /* Initialize function. */ NPError NP_Initialize(void) { /* Get the user agent from the browser. */ char* result = NPN_UserAgent(); if (result == NULL) return NPERR_OUT_OF_MEMORY_ERROR; /* Allocate some memory so that you can keep a copy of it. */ userAgent = (char*) NPN_MemAlloc(strlen(result) + 1); if (userAgent == NULL) return NPERR_OUT_OF_MEMORY_ERROR; /* Copy the string to your memory. */ strcpy(userAgent, result); return NPERR_NO_ERROR; } /* Shutdown function */ NPError NP_Shutdown(void) { /* Delete the memory you allocated. */ if (userAgent != NULL) NPN_MemFree(userAgent); return NPERR_NO_ERROR; }userAgent 是什么，“用户代理”？算了暂时不管了，反正它是个全局静态指针变量。指的是NPN_UserAgent（）得到的资源。
二、MIMEType 在初始化的时候，浏览器会去数MIMEType类型的已被注册的插件。接着看看怎么注册插件吧。 “A MIME type is made up of a major type (such as application or image) and a minor type, for example, image/jpeg.If you define a new MIME type for a plug-in, you must register it with IETF (Internet Engineering Task Force). Until your new MIME type is registered, preface its name with “x-“, for example, image/x-nwim.” IETF看不懂。我的FF浏览器application已经存在，所以我昨天修改的MIMEType没有加“x-”。
紧接着往后看我就炸了！ When a Gecko-based browser starts up, it checks certain directories for plug-ins, in this order:
Windows 1、Directory pointed to by MOZ_PLUGIN_PATH environment variable. 2、%APPDATA%\Mozilla\plugins, where %APPDATA% denotes per-user Application Data directory. 3、Plug-ins within toolkit bundles. 4、Profile directory\plugins, where Profile directory is a user profile directory. 5、Directories pointed to by HKEY_CURRENT_USER\Software\MozillaPlugins*\Path registry value, where * can be replaced by any name. 6、Directories pointed to by HKEY_LOCAL_MACHINE\Software\MozillaPlugins*\Path registry value, where * can be replaced by any name.
奇怪啊，最开始我在 HKEY_LOCAL_MACHINE\Software\MozillaPlugins\添加@mozilla.com.cn/test可是浏览器并没有检测到我的插件啊，反而在HKEY_CURRENT_USER\Software\MozillaPlugins\添加时才有效果。现在再试一次，还是如此！ 算了不较真了，除了最后一条，其他的在我电脑上都好用。
Mac OS X 1、~/Library/Internet Plug-Ins. 2、/Library/Internet Plug-Ins. 3、/System/Library/Frameworks/JavaVM.framework/Versions/Current/Resources. 4、Plug-ins within toolkit bundles. 5、Profile directory/plugins, where Profile directory is a user profile directory.
Linux 1、 Directory pointed to by MOZ_PLUGIN_PATH environment variable. For example:
#!/bin/bash export MOZ_PLUGIN_PATH=/usr/lib64/mozilla/plugins exec /usr/lib64/firefox/firefox Which /usr/lib64/mozilla/plugins this is path for folder with plugins, /usr/lib64/firefox/firefox this is path for firefox (binary file).2、 ~/.mozilla/plugins. 3、 /usr/lib/mozilla/plugins (on 64-bit systems, /usr/lib64/mozilla/plugins is used instead).
