以recursion方式recursion地怎么做呢？

我需要在具有多个子文件夹的文件夹上打印事件。如何做到recursion？请打印一个c ++代码。我被困住了！每当evet被强行打开，我需要打开子文件夹，把文件，并将其复制到另一个目录。我不想列出所有的子文件夹在每2秒钟，并find文件，如果有的话。效率不高。我需要使用一个监视器文件夹。请帮忙

我想监视的导演有多个子文件夹。每个子文件夹有另一个子文件夹，可以在一段时间内包含一个文件。 MainFolder->子文件夹 – >每个子文件夹 – >子文件夹 – >文件。

这是我为他片刻的代码：

/* */ #include <pthread.h> #include <unistd.h> #include <iostream> #include <sys/inotify.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <sys/types.h> #include <sys/inotify.h> #include <vector> #include <string> #include <stdio.h> #include <stdlib.h> #include <pthread.h> using namespace std; vector<string> SS; void *print_message_function( void *ptr ); int main(int argc, char **argv ){ pthread_t t1; int fd,fd1,wd,wd1,i=0,i1=0,len=0,len1=0; int length; char pathname[100],buf[1024],buf1[1024]; int data; struct inotify_event *event; char *message1 = "Thread 1"; FILE *fr; // fd=inotify_init1(IN_NONBLOCK);//--rewrite fd = inotify_init(); /* watch /test directory for any activity and report it back to me */ wd=inotify_add_watch(fd,"/home/MainFoder/",IN_ALL_EVENTS); // int flag=0; // char*ev=""; //wd=inotifytools_watch_recursively_with_exclude("/home/MainFolder/",IN_ALL_EVENTS); while(1) { //sleep(30); //read 1024 bytes of events from fd into buf i=0; len=read(fd,buf,1024); while(i<len){ event=(struct inotify_event *) &buf[i]; /* watch /test directory for any activity and report it back to me */ /* check for changes */ { if((event->mask & IN_OPEN) ||(event->mask & IN_CREATE)) { printf("\n %s :was opened\n",event->name); SS.push_back(event->name); } } /* update index to start of next event */ i+=sizeof(struct inotify_event)+event->len; } vector<string>::const_iterator cii; for(cii=SS.begin(); cii!=SS.end(); cii++) { wd1 = watch_from_filename(*ci); } /* vector<string>::const_iterator cii; for(cii=SS.begin(); cii!=SS.end(); cii++) { cout <<"HERE:"<< *cii << endl; } */ int iret1, iret2; /* Create independent threads each of which will execute function */ iret1 = pthread_create( &t1, NULL, print_message_function, (void*) message1); } } void *print_message_function( void *ptr ) { vector<string>::const_iterator cii; for(cii=SS.begin(); cii!=SS.end(); cii++) { cout <<"HERE:"<< *cii << endl; std::string path=exec } }

您可以分两步进行：

检测您对根目录感兴趣的所有更改，以及（如果尚未包含的话）创建（ IN_CREATE ）。
如果创建是一个目录，则对其执行整个算法。

Github上的这个工作示例可以完成要查找的内容： inotify-example.cpp

在CREATE事件上，当前wd（监视描述符）以及inotify_event wd和name组件被添加到Watch对象中（请参阅示例）。这个类包括以几种方式查找wd和名字的方法。

这段代码展示了如何处理CREATE / DELETE事件：

  if ( event->mask & IN_CREATE ) { current_dir = watch.get(event->wd); if ( event->mask & IN_ISDIR ) { new_dir = current_dir + "/" + event->name; wd = inotify_add_watch( fd, new_dir.c_str(), WATCH_FLAGS ); watch.insert( event->wd, event->name, wd ); total_dir_events++; printf( "New directory %s created.\n", new_dir.c_str() ); } else { total_file_events++; printf( "New file %s/%s created.\n", current_dir.c_str(), event->name ); } } else if ( event->mask & IN_DELETE ) { if ( event->mask & IN_ISDIR ) { new_dir = watch.erase( event->wd, event->name, &wd ); inotify_rm_watch( fd, wd ); total_dir_events--; printf( "Directory %s deleted.\n", new_dir.c_str() ); } else { current_dir = watch.get(event->wd); total_file_events--; printf( "File %s/%s deleted.\n", current_dir.c_str(), event->name ); } }

我已经为你写了代码。现在，你必须在这个代码中只做一个改变。只需在主函数中给出你的目录路径。

 #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <sys/types.h> #include <sys/inotify.h> #include <limits.h> #include<sys/stat.h> #include<dirent.h> #include<time.h> #include<string.h> #include<unistd.h> #define MAX_EVENTS 1024 /*Max. number of events to process at one go*/ #define LEN_NAME 16 /*Assuming that the length of the filename won't exceed 16 bytes*/ #define EVENT_SIZE ( sizeof (struct inotify_event) ) /*size of one event*/ #define BUF_LEN ( MAX_EVENTS * ( EVENT_SIZE + LEN_NAME )) /*buffer to store the data of events*/ void monitor(char *); int evnt_mon(char *); void main() { if(fork()==0) evnt_mon("./usssb");// give path of your directory which you want to monitor monitor("./usssb");// give path of your directory which you want to monitor while(1); } void monitor(char * rt_dir) { struct stat st; DIR *dirp; struct dirent *dp; char str[100][100]={ }; char temp[100]; char str1[500]=" "; int i=0,j=0,src_ret=9,src_ret1=9; strcpy(str1,rt_dir); dirp=opendir(str1); if(dirp==NULL) { perror("opendir"); return; } while(1) { dp=readdir(dirp); if(dp==NULL) break; if((strcmp(dp->d_name,".\0")==0) || (strcmp(dp->d_name,"..")==0)) continue; if((dp->d_type==DT_DIR)&&((strcmp(dp->d_name,".")!=0)&&(strcmp(dp->d_name,"..")!=0))) { strcat(str[i],str1); strcat(str[i],"/"); strcat(str[i],dp->d_name); if(fork()==0) { evnt_mon(str[i]); } i++; } } closedir(dirp); if(i>0) { for(j=0;j<i;j++) { monitor(str[j]); } } } int evnt_mon(char *argv) { int length, i = 0, wd; int fd; char buffer[BUF_LEN]; /* Initialize Inotify*/ fd = inotify_init(); if ( fd < 0 ) { perror( "Couldn't initialize inotify"); } /* add watch to starting directory */ wd = inotify_add_watch(fd, argv, IN_CREATE | IN_MODIFY | IN_DELETE); if (wd == -1) { printf("Couldn't add watch to %s\n",argv); } else { printf("Watching:: %s\n",argv); } /* do it forever*/ while(1) { i = 0; length = read( fd, buffer, BUF_LEN ); if ( length < 0 ) { perror( "read" ); } while ( i < length ) { struct inotify_event *event = ( struct inotify_event * ) &buffer[ i ]; if ( event->len ) { if ( event->mask & IN_CREATE) { if (event->mask & IN_ISDIR) { printf( "The directory %s was Created in %s.\n", event->name,argv ); if(fork()==0) { char p[100]=" "; strcpy(p,argv); strcat(p,"/"); strcat(p,event->name); evnt_mon(p); } } else printf( "The file %s was Created with WD %d\n", event->name, event->wd ); } if ( event->mask & IN_MODIFY) { if (event->mask & IN_ISDIR) printf( "The directory %s was modified.\n", event->name ); else printf( "The file %s was modified with WD %d\n", event->name, event->wd ); } if ( event->mask & IN_DELETE) { if (event->mask & IN_ISDIR) printf( "The directory %s was deleted from %s.\n", event->name,argv ); else printf( "The file %s was deleted with WD %d\n", event->name, event->wd ); } i += EVENT_SIZE + event->len; } } } /* Clean up*/ inotify_rm_watch( fd, wd ); close( fd ); return 0; }

为了解决由肋骨（“洞”:)所述的问题。一个可能的解决方案，我能想到的是，我们可以做一个“轮询目录”和“使用inotify”的组合…即每次检测到一个目录（目录只，不要做文件）：

为新检测的目录添加一个观察点以便进行检测
'poll'（或'scan'）新检测到的目录（man readdir（））来查看是否已经创建了项目（文件，目录）。那些可能是缺少的。

请注意，要建立一个“气密”的情况下，上述步骤的顺序是重要的。您需要首先添加观察点，而不是扫描…这将保证通过“扫描”或inotify或两者同时拾取项目。在这种情况下，你可能还需要知道这个dups。即相同的项目可以由扫描和inotify产生