Linux插件框架实验报告(共30页).doc

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1、精选优质文档-倾情为你奉上电 子 科 技 大 学实 验 报 告学生姓名： 学 号： 指导教师：实验地点：A2-412 实验时间：2012.01.04一、实验室名称：Linux环境高级编程实验室二、实验项目名称：插件框架实验三、实验学时：4学时四、实验目的：学习和实践插件框架的开发。理解插件的工作原理，为进一步开发高可用，高复杂度的插件打下基础。五、实验内容：1、使用动态链接库实现打印功能：开发一个程序，向屏幕打印“Hello World”；在不重新编译链接原程序的前提下，将打印的文字改为“Hello China”。2、使用动态链接库实现自定义打印功能：同时要打印“Hello World”，打印

2、“Hello China”，甚至同时打印未来才会增加的其他打印信息，打印信息的链接库放在一个固定目录中，遍历这个目录，获取所有动态链接库。打印未来的这些信息，也不能重新编译链接原程序。3、1）通过命令行方式：./a.out help，输出所有插件实现的功能ID，以及该功能ID对应的功能描述。2）通过命令行方式：./a.out FuncID，调用具体打印功能（每个插件导出GetID接口）。4、将插件导出的Print、GetID、Help三个函数放在一个类中，主程序需要使用多个容器分别保存这些函数地址，让插件外部获取该类的对象。综合练习：实现一个软件系统，该系统可对文件进行统计分析。究竟对文件进行

3、什么样的统计分析，最终用户自己也不是很清楚，目前只知道需要统计文件的行数。也就是说，本软件系统将会随时面临，增加文件统计新功能的难题。请结合本实验内容，设计并实现这样一个面向文件统计功能的插件系统。（需要实现的插件包括：统计某个文件的行数，统计某个文件的字节数）六、实验步骤：程序1：A. h:extern c void f();a2.cpp：#include#includea.husing namespace std;void f() cout hello,China! endl;A1.cpp:#include#includea.husing namespace std;void f() co

4、ut Hello,Word endl;Main.cpp:#includea.h#include#includeusing namespace std;int main() void *handle = dlopen(./libtest.so, RTLD_LAZY); if(0 = handle) cout dlopen error endl;return 0; typedef void (*Fun)(); Fun f1 = (Fun)dlsym(handle, f); if(0 = f1) cout f1 error endl; char *str = dlerror();cout str e

5、ndl; (*f1)(); dlclose(handle); return 0;程序运行结果如图1所示：图1：字符的变换程序2：A1.cpp:#includeusing namespace std;externC void f()cout Hello world endl;A2.cpp:#includeusing namespace std;extern C void f() cout Hello,china! endl;A3.cpp:#includeusing namespace std;extern C void f()cout Hello 333 endl;A4.cpp:#include

6、using namespace std;extern C void f()cout Hello 4444 endl;Test2.cpp:#include#include#include#include#includeusing namespace std;int main()char path260;DIR *dir;struct dirent *ptr; dir=opendir(/root/test/test4/plug2/plugin/);while(ptr=readdir(dir)!=NULL)if (strcmp(ptr-d_name,.)=0)|(strcmp(ptr-d_name,

7、.)=0)continue;sprintf(path,/root/test/test4/plug2/plugin/%s, ptr-d_name); void *handle = dlopen(path, RTLD_LAZY); if(0 = handle) cout dlopen error endl;return 0; typedef void (*Fun)(); Fun pf = (Fun)dlsym(handle, f); if(0 = pf) cout pf error endl; char *str = dlerror();cout str endl;return 0; (*pf)(

8、);dlclose(handle); closedir(dir);程序运行结果如图2所示：图2：插件的遍历程序3：a1.cpp:#include using namespace std;const int FUNC_ID = 1;extern C void f() cout Hello World! endl;extern C void Help() cout Function ID FUNC_ID : This function prints Hello World. endl;a2.cpp:#include using namespace std;const int FUNC_ID = 2

9、;extern C void f() cout Hello China! endl;extern C void Help() cout Function ID FUNC_ID This function prints hello china. endl;CPluginEnumerator.cpp#include CPluginEnumerator.h#include #include #include #include CPluginEnumerator:CPluginEnumerator()CPluginEnumerator:CPluginEnumerator()bool CPluginEn

10、umerator:GetPluginNames(vector& vstrPluginNames) DIR *dir = opendir(/root/test/test4/plug3/plugin); if(dir = 0)return false; for(;) struct dirent *ptr = readdir(dir);if(ptr = 0)break;if(strcmp(ptr-d_name, .) = 0)|(strcmp(ptr-d_name, .) = 0)continue;char path260;sprintf(path, /root/test/test4/plug3/p

11、lugin/%s, ptr-d_name);vstrPluginNames.push_back(path); closedir(dir);return true;Test.cpp:#include #include #include CPluginEnumerator.h#include #include using namespace std;int main(int argc, char *argv)char path 260; if(argc != 2)return 0; if(strcmp(argv1, help) = 0) vector vstrPluginNames; CPlugi

12、nEnumerator enumerator; if(!enumerator.GetPluginNames(vstrPluginNames) cout GetPluginNames error endl;return 0; for(int i = 0; i vstrPluginNames.size(); i+) void *handle = dlopen(vstrPluginNamesi.c_str(), RTLD_LAZY);if(handle = 0)cout dlopen error endl; return 0;typedef void (*FUNC_HELP)();FUNC_HELP

13、 dl_help = (FUNC_HELP)dlsym(handle, Help);if(dl_help = 0)cout dlsym error endl; return 0;(dl_help)();dlclose(handle);else if(strcmp(argv1, 1) = 0)sprintf(path, /root/test/test4/plug3/plugin/%s, a1.so);void *handle = dlopen(path, RTLD_LAZY);if(handle = 0)cout dlopen error endl;return 0;typedef void (

14、*FUNC_PRINT)();FUNC_PRINT dl_print = (FUNC_PRINT)dlsym(handle, f);if(dl_print = 0)cout dlsym error endl;return 0;(dl_print)();dlclose(handle);else if(strcmp(argv1, 2) = 0)/ 得到第二个func的参数sprintf(path, /root/test/test4/plug3/plugin/%s, a2.so);void *handle = dlopen(path, RTLD_LAZY);if(handle = 0)cout dl

15、open error endl;return 0;typedef void (*FUNC_PRINT)();FUNC_PRINT dl_print = (FUNC_PRINT)dlsym(handle, f);if(dl_print = 0)cout dlsym error endl;return 0;(dl_print)();dlclose(handle);return 0;程序运行结果如图3所示：图3：插件输出程序4：CPluginEnumerator.h:#ifndef CPLUGINENUMERATOR_H#define CPLUGINENUMERATOR_H#include #inc

16、lude using namespace std;class CPluginEnumeratorpublic: CPluginEnumerator(); virtual CPluginEnumerator(); bool GetPluginNames(vector& vstrPluginNames);#endifCPluginEnumerator.cpp：#include CPluginEnumerator.h#include #include CPluginEnumerator:CPluginEnumerator()CPluginEnumerator:CPluginEnumerator()b

17、ool CPluginEnumerator:GetPluginNames(vector& vstrPluginNames) DIR *dir = opendir(./plugin); if(dir = 0)return false; for(;) struct dirent *pentry = readdir(dir);if(pentry = 0) break;if(strcmp(pentry-d_name, .) = 0) continue;if(strcmp(pentry-d_name, .) = 0) continue;string str = ./plugin/;str += pent

18、ry-d_name;vstrPluginNames.push_back(str); closedir(dir); return true;CPluginController.h#ifndef CPLUGINCONTROLLER_H#define CPLUGINCONTROLLER_H#include class IPrintPlugin;class CPluginControllerpublic:CPluginController(void);virtual CPluginController(void);bool InitializeController(void);bool Uniniti

19、alizeController(void);bool ProcessHelp(void);bool ProcessRequest(int FunctionID);private:std:vector m_vhForPlugin;std:vector m_vpPlugin;#endifCPluginController.cpp#include CPluginController.h#include CPluginEnumerator.h#include IPrintPlugin.h#include dlfcn.hCPluginController:CPluginController(void)C

20、PluginController:CPluginController(void)bool CPluginController:InitializeController(void)std:vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)return false;for(unsigned int i=0 ; ivstrPluginNames.size(); i+)typedef int (*PLUGIN_CREATE)(IPrintPlugin*);P

21、LUGIN_CREATE CreateProc; IPrintPlugin *pPlugin = NULL;void* hinstLib = dlopen(vstrPluginNamesi.c_str(), RTLD_LAZY); if(hinstLib != NULL) m_vhForPlugin.push_back(hinstLib);CreateProc = (PLUGIN_CREATE)dlsym(hinstLib, CreateObj); if(NULL != CreateProc) (CreateProc)(&pPlugin);if(pPlugin != NULL)m_vpPlug

22、in.push_back(pPlugin);return true;bool CPluginController:ProcessRequest(int FunctionID)for(unsigned int i = 0; i GetID() = FunctionID)m_vpPlugini-Print();break;return true;bool CPluginController:ProcessHelp(void)std:vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vs

23、trPluginNames)return false;for(unsigned int i=0 ; iHelp();dlclose(hinstLib);return true;bool CPluginController:UninitializeController()for(unsigned int i = 0; i m_vhForPlugin.size(); i+)dlclose(m_vhForPlugini);return true;IPrintPlugin.h#pragma onceclass IPrintPluginpublic:IPrintPlugin();virtual IPri

24、ntPlugin();virtual void Help() = 0;virtual void Print() = 0;virtual int GetID() = 0;IPrintPlugin.cpp#include IPrintPlugin.hIPrintPlugin:IPrintPlugin()IPrintPlugin:IPrintPlugin()Function.cpp#include #include IPrintPlugin.husing namespace std;const int FUNC_ID = 1;class CPrintPlugin : public IPrintPlu

25、ginpublic:CPrintPlugin()virtual CPrintPlugin()virtual void Print()cout Hello World! endl;virtual void Help()cout Function ID FUNC_ID : This function will print hello world. endl;virtual int GetID(void)return FUNC_ID;extern C void CreateObj(IPrintPlugin *ppPlugin)static CPrintPlugin plugin;*ppPlugin

26、= &plugin;function1.cpp#include #include IPrintPlugin.husing namespace std;const int FUNC_ID = 2;class CPrintPlugin : public IPrintPluginpublic:CPrintPlugin()virtual CPrintPlugin()virtual void Print()cout Hello China! endl;virtual void Help()cout Function ID FUNC_ID : This function will print hello

27、china. endl;virtual int GetID(void)return FUNC_ID;extern C void CreateObj(IPrintPlugin *ppPlugin)static CPrintPlugin plugin;*ppPlugin = &plugin;Main.cpp#include #include CPluginController.h#include #include using namespace std;int main(int argc, char *argv)if(argc != 2)cout Parameters error endl;ret

28、urn 0;if(strcmp(argv1, help) = 0)CPluginController pc;pc.ProcessHelp();return 0;int FunctionID = atoi(argv1);CPluginController pc;pc.InitializeController();pc.ProcessRequest(FunctionID);pc.UninitializeController();return 0;程序运行结果如图4所示：图4：插件获取类对象综合练习：CPluginController.cpp#include CPluginController.h#

29、include CPluginEnumerator.h#include IPrintPlugin.h#include dlfcn.h#include CPluginController:CPluginController(void)CPluginController:CPluginController(void)bool CPluginController:InitializeController(void)std:vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPlug

30、inNames)return false;for(unsigned int i=0 ; ivstrPluginNames.size(); i+)typedef int (*PLUGIN_CREATE)(IPrintPlugin*);PLUGIN_CREATE CreateProc; IPrintPlugin *pPlugin = NULL;void* hinstLib = dlopen(vstrPluginNamesi.c_str(), RTLD_LAZY); if(hinstLib != NULL) m_vhForPlugin.push_back(hinstLib);CreateProc =

31、 (PLUGIN_CREATE)dlsym(hinstLib, CreateObj); if(NULL != CreateProc) (CreateProc)(&pPlugin);if(pPlugin != NULL)m_vpPlugin.push_back(pPlugin);return true;bool CPluginController:ProcessRequest(int FunctionID)for(unsigned int i = 0; i GetID() = FunctionID)m_vpPlugini-Print();break;return true;bool CPlugi

32、nController:ProcessHelp(void)std:vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)return false;for(unsigned int i=0 ; iHelp();dlclose(hinstLib);return true;bool CPluginController:IfProcess(char *Function)/判断插件是否存在unsigned int i;for(i = 0; i GetName()

33、= 0)break;if(i m_vpPlugin.size()/插件存在return true;elsereturn false;bool CPluginController:ProcessFunction(char *Function,char*Document)/执行插件功能for(unsigned int i = 0; i GetName() = 0)m_vpPlugini-Fun(Document);/插件功能break;return true;bool CPluginController:UninitializeController()for(unsigned int i = 0;

34、 i m_vhForPlugin.size(); i+)dlclose(m_vhForPlugini);return true;CPluginController.h#ifndef CPLUGINCONTROLLER_H#define CPLUGINCONTROLLER_H#include class IPrintPlugin;class CPluginControllerpublic:CPluginController(void);virtual CPluginController(void);bool InitializeController(void);bool UninitializeController(void);bool ProcessHelp(void);bool ProcessRequest(int FunctionID);bool IfProcess(char *Function);bool ProcessFunction(char