最新Linux插件框架实验报告.doc

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1、精品资料精品资料.LinuxLinux 插件框架实验插件框架实验报告报告精品资料精品资料.电电 子子 科科 技技 大大 学学实实验验报报告告学生姓名：学生姓名：学学 号：号：指导指导教师：教师：实验地点：实验地点：A2-412A2-412实验时间：实验时间：2012.01.042012.01.04一、实验室名称：一、实验室名称：Linux 环境高级编程实验室二、实验项目名称：二、实验项目名称：插件框架实验三、实验学时：三、实验学时：4 学时四、实验目的：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：五、实验内容：精品资料精

2、品资料.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“HelloChina”，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

3、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，增加文精品资料精品资料.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：六、实验步骤：程序 1：A.h:ext

4、ern 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()cout Hello,Word endl;Main.cpp:精品资料精品资料.#includea.h#include#includeusing namespace std;int main()void *handle = dlopen(./libtest.so, RTLD_LAZY);if(0 = hand

5、le)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 endl;(*f1)();dlclose(handle);return 0;程序运行结果如图 1 所示：图 1：字符的变换精品资料精品资料.程序 2：A1.cpp:#includeusing namespace std;externC void f()cout Hello world endl;A2.c

6、pp:#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:#includeusing namespace std;extern C void f()cout Hello 4444 endl;Test2.cpp:#include#include#include#include#includeusing namespace std;精品资料精品资料.int m

7、ain()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,.)=0)continue;sprintf(path,/root/test/test4/plug2/plugin/%s, ptr-d_name);void *handle = dlopen(path, RTLD_LAZY);if(0 = handle)cout dlo

8、pen 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)();dlclose(handle);closedir(dir);程序运行结果如图 2 所示：精品资料精品资料.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(

9、)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;extern C void f()cout Hello China! endl;extern C void Help()cout Function ID FUNC_ID This function prints hello china. endl;CPluginE

10、numerator.cpp#include CPluginEnumerator.h#include #include 精品资料精品资料.#include #include CPluginEnumerator:CPluginEnumerator()CPluginEnumerator:CPluginEnumerator()bool CPluginEnumerator:GetPluginNames(vector& vstrPluginNames)DIR *dir = opendir(/root/test/test4/plug3/plugin);if(dir = 0)return false;for(

11、;)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/plugin/%s, ptr-d_name);vstrPluginNames.push_back(path);closedir(dir);return true;Test.cpp:#include #include #include CPluginEnumera

12、tor.h#include #include using namespace std;int main(int argc, char *argv)精品资料精品资料.char path 260;if(argc != 2)return 0;if(strcmp(argv1, help) = 0)vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)cout GetPluginNames error endl;return 0;for(int i = 0; i

13、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 dl_help = (FUNC_HELP)dlsym(handle, Help);if(dl_help = 0)cout dlsym error endl;return 0;(dl_help)();dlclose(handle);else if(strcmp(a

14、rgv1, 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;精品资料精品资料.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)(

15、);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 dlopen error endl;return 0;typedef void (*FUNC_PRINT)();FUNC_PRINT dl_print = (FUNC_PRINT)dlsym(handle, f);if(dl_print = 0)c

16、out dlsym error endl;return 0;(dl_print)();dlclose(handle);return 0;程序运行结果如图 3 所示：精品资料精品资料.图 3：插件输出程序 4：CPluginEnumerator.h:#ifndef CPLUGINENUMERATOR_H#define CPLUGINENUMERATOR_H#include #include using namespace std;class CPluginEnumeratorpublic:CPluginEnumerator();virtual CPluginEnumerator();bool G

17、etPluginNames(vector& vstrPluginNames);#endifCPluginEnumerator.cpp：#include CPluginEnumerator.h#include #include CPluginEnumerator:CPluginEnumerator()CPluginEnumerator:CPluginEnumerator()精品资料精品资料.bool CPluginEnumerator:GetPluginNames(vector& vstrPluginNames)DIR *dir = opendir(./plugin);if(dir = 0)re

18、turn 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 += pentry-d_name;vstrPluginNames.push_back(str);closedir(dir);return true;CPluginController.h#ifndef CPLUGINCONTROLLE

19、R_H#define CPLUGINCONTROLLER_H#include class IPrintPlugin;class CPluginControllerpublic:CPluginController(void);virtual CPluginController(void);bool InitializeController(void);精品资料精品资料.bool UninitializeController(void);bool ProcessHelp(void);bool ProcessRequest(int FunctionID);private:std:vector m_v

20、hForPlugin;std:vector m_vpPlugin;#endifCPluginController.cpp#include CPluginController.h#include CPluginEnumerator.h#include IPrintPlugin.h#include dlfcn.hCPluginController:CPluginController(void)CPluginController:CPluginController(void)bool CPluginController:InitializeController(void)std:vector vst

21、rPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)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(),

22、RTLD_LAZY);if(hinstLib != NULL)精品资料精品资料.m_vhForPlugin.push_back(hinstLib);CreateProc = (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

23、int i = 0; i GetID() = FunctionID)m_vpPlugini-Print();break;return true;bool CPluginController:ProcessHelp(void)std:vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)return false;for(unsigned int i=0 ; iHelp();dlclose(hinstLib);return true;bool CPlugin

24、Controller:UninitializeController()for(unsigned int i = 0; i m_vhForPlugin.size(); i+)dlclose(m_vhForPlugini);return true;IPrintPlugin.h#pragma onceclass IPrintPlugin精品资料精品资料.public:IPrintPlugin();virtual IPrintPlugin();virtual void Help() = 0;virtual void Print() = 0;virtual int GetID() = 0;IPrintP

25、lugin.cpp#include IPrintPlugin.hIPrintPlugin:IPrintPlugin()IPrintPlugin:IPrintPlugin()Function.cpp#include #include IPrintPlugin.husing namespace std;const int FUNC_ID = 1;class CPrintPlugin : public IPrintPluginpublic:CPrintPlugin()virtual CPrintPlugin()virtual void Print()cout Hello World! endl;精品

26、资料精品资料.virtual void Help()cout Function ID FUNC_ID : This function will printhello world. endl;virtual int GetID(void)return FUNC_ID;extern C void CreateObj(IPrintPlugin *ppPlugin)static CPrintPlugin plugin;*ppPlugin = &plugin;function1.cpp#include #include IPrintPlugin.husing namespace std;const in

27、t FUNC_ID = 2;class CPrintPlugin : public IPrintPluginpublic:CPrintPlugin()virtual CPrintPlugin()virtual void Print()cout Hello China! endl;virtual void Help()精品资料精品资料.cout Function ID FUNC_ID : This function will printhello china. endl;virtual int GetID(void)return FUNC_ID;extern C void CreateObj(I

28、PrintPlugin *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;return 0;if(strcmp(argv1, help) = 0)CPluginController pc;pc.ProcessHelp();retu

29、rn 0;int FunctionID = atoi(argv1);CPluginController pc;精品资料精品资料.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#include CPluginEnumerator.h#include IPrintPlugin.h#include dlfc

30、n.h#include CPluginController:CPluginController(void)CPluginController:CPluginController(void)bool CPluginController:InitializeController(void)精品资料精品资料.std:vector vstrPluginNames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)return false;for(unsigned int i=0 ; ivstrPlugi

31、nNames.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 = (PLUGIN_CREATE)dlsym(hinstLib,CreateObj);if(NULL != Crea

32、teProc)(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)精品资料精品资料.m_vpPlugini-Print();break;return true;bool CPluginController:ProcessHelp(void)std:vector vstrPluginN

33、ames;CPluginEnumerator enumerator;if(!enumerator.GetPluginNames(vstrPluginNames)return false;for(unsigned int i=0 ; iHelp();dlclose(hinstLib);精品资料精品资料.return true;bool CPluginController:IfProcess(char *Function)/判断插件是否存在unsigned int i;for(i = 0; i GetName() = 0)break;if(i m_vpPlugin.size()/插件存在retur

34、n 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; i m_vhForPlugin.size(); i+)dlclose(m_vhFo

35、rPlugini);精品资料精品资料.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

36、(void);bool ProcessRequest(int FunctionID);bool IfProcess(char *Function);bool ProcessFunction(char *Function,char *Document);private:std:vector m_vhForPlugin;std:vector m_vpPlugin;#endifCPluginEnumerator.h#ifndef CPLUGINENUMERATOR_H#define CPLUGINENUMERATOR_H#include #include using namespace std;cl

37、ass CPluginEnumerator精品资料精品资料.public:CPluginEnumerator();virtual CPluginEnumerator();bool GetPluginNames(vector& vstrPluginNames);#endifCPluginEnumerator.cpp#include CPluginEnumerator.h#include #include CPluginEnumerator:CPluginEnumerator()CPluginEnumerator:CPluginEnumerator()bool CPluginEnumerator:

38、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 += pentry-d_name;vstrPluginNames.pus

39、h_back(str);精品资料精品资料.closedir(dir);return true;Main.cpp#include #include CPluginController.h#include #include using namespace std;int main(int argc, char *argv)if(argc = 2)if(strcmp(argv1, help) = 0)/帮助功能CPluginController pc;pc.ProcessHelp();return 0;elseint FunctionID = atoi(argv1);CPluginControlle

40、r pc;pc.InitializeController();pc.ProcessRequest(FunctionID);pc.UninitializeController();return 0;else if(argc = 3)CPluginController pc;char *Function = argv1;/Function+=.so;char *Document = argv2;/操作的文件名精品资料精品资料.pc.InitializeController();if(pc.IfProcess(Function)=false)/判断插件是否存在cout No this plugin!

41、 endl;else/pc.ProcessFunction(Function,Document);pc.UninitializeController();return 0;elsecout Parameters error endl;return 0;插件：插件：IPrintPlugin.cpp#include IPrintPlugin.hIPrintPlugin:IPrintPlugin()IPrintPlugin:IPrintPlugin()IPrintPlugin.h#pragma onceclass IPrintPluginpublic:IPrintPlugin();virtual I

42、PrintPlugin();virtual void Help() = 0;virtual void Print() = 0;精品资料精品资料.virtual int GetID() = 0;virtual char * GetName() = 0;/添加部分virtual void Fun(char*) = 0;Line.cpp#include #include IPrintPlugin.h#include /read(file)#include #include using namespace std;const int FUNC_ID = 3;char FUNC_NAME=sl;/sta

43、tistics line!class CPrintPlugin : public IPrintPluginpublic:CPrintPlugin()virtual CPrintPlugin()virtual void Print()cout Statistics the document line! endl;virtual void Help()cout Function ID FUNC_ID : This function willstatistics the document line. endl;virtual int GetID(void)return FUNC_ID;精品资料精品资

44、料.virtual char *GetName()return FUNC_NAME;virtual void Fun(char *Document)int fp;char temp;long num=0;/统计/open fileif(fp=open(Document,O_RDONLY)=-1)coutCan not open: Documentendl;return ;while(read(fp,&temp,1)if(temp=n)num+;close(fp);coutDocument lines is :numendl;extern C void CreateObj(IPrintPlugi

45、n *ppPlugin)static CPrintPlugin plugin;*ppPlugin = &plugin;Words.cpp#include #include IPrintPlugin.h#include /read(file)#include using namespace std;const int FUNC_ID = 4;精品资料精品资料.char FUNC_NAME=sw;/statistics wordsclass CPrintPlugin : public IPrintPluginpublic:CPrintPlugin()virtual CPrintPlugin()vi

46、rtual void Print()cout statistics the document words! endl;virtual void Help()cout Function ID FUNC_ID : This function willstatistics the document words. endl;virtual int GetID(void)return FUNC_ID;virtual char *GetName()return FUNC_NAME;virtual void Fun(char *Document)int fp;char temp;long num=0;/统计

47、/open fileif(fp=open(Document,O_RDONLY)=-1)coutCan not open: Documentendl;return ;精品资料精品资料.;while(read(fp,&temp,1)num+;close(fp);if(num=0)coutEmpty file: Documentendl;return ;coutDocumentwords is :numendl;extern C void CreateObj(IPrintPlugin *ppPlugin)static CPrintPlugin plugin;*ppPlugin = &plugin;程序运行结果如图 5 所示：图 5：插件获取类对象精品资料精品资料.七、总结及心得体会：七、总结及心得体会：本次试验了解并大致掌握了 linux下插件开发的多种方法，尤其是综合试验中，对于插件的安装。这将很好的为以后的编程学习提供帮助。此外本次试验让我懂得了：耐心就会有结果！八、对本实验过程及方法、手段的改进建议：八、对本实验过程及方法、手段的改进建议：本次综合实验已经能够动态装、卸插件基本符合实际应用。以后的开发中应能用插件获取主体程序中的功能并修改。报告评分：报告评分：指导教师签字：指导教师签字：