1.首先要打開目錄文件

DIR *opendir( const char *name);

DIR *fdopendir( int fd);

2.讀取目錄文件信息的函數 ? ?

注意：這是個庫函數

struct dirent *readdir( DIR *dirp);

int readdir_r( ?? DIR *dirp, ? ? struct dirent *entry, ?? struct dirent **result);

文件目錄結構體：

struct dirent {ino_t d_ino; /* inode number 索引節點號*/off_t d_off; /* not an offset; see NOTES 在目錄文件中的偏移*/unsigned short d_reclen; /* length of this record 文件名長*/unsigned char d_type; /*type of file; not supported by all filesystem types 文件類型*/ char d_name[256]; /* filename 文件名，最長255字符*/ };

d_type的值為：

• DT_BLK This is a block device.
• DT_CHR This is a character device.
• DT_DIR This is a directory.
• DT_FIFO This is a named pipe (FIFO).
• DT_LNK This is a symbolic link.
• DT_REG This is a regular file.
• DT_SOCK This is a UNIX domain socket.
• DT_UNKNOWN The file type is unknown.

readdir（）函數實例：

注意：

每次使用readdir后，readdir會讀到下一個文件，readdir是依次讀出目錄中的所有文件，每次只能讀一個

這個特性和readdir_r()一樣

#include <stdio.h> #include <sys/types.h> #include <dirent.h> int main(int argc, char **argv){DIR *pDir = NULL;struct dirent * pEnt = NULL;unsigned int cnt = 0; if (argc != 2){printf("usage: %s dirname\n", argv[0]);return -1;}pDir = opendir(argv[1]);if (NULL == pDir){perror("opendir");return -1;} while (1){pEnt = readdir(pDir);if(pEnt != NULL){if (pEnt->d_type == DT_REG){printf("是普通文件:");}else{printf("不是普通文件:");}printf("name：[%s] \n", pEnt->d_name);cnt++;}else{break;}};printf("總文件數為：%d\n", cnt);return 0; }

結果：

$ ./a.out . 是普通文件:name：[a.c] 不是普通文件:name：[.] 不是普通文件:name：[..] 是普通文件:name：[a.out] 不是普通文件:name：[12_sr] 不是普通文件:name：[10_sr] 不是普通文件:name：[17_sr] 不是普通文件:name：[15_sr] 不是普通文件:name：[14.sr] 不是普通文件:name：[18_sr] 不是普通文件:name：[udp] 不是普通文件:name：[16_sr] 不是普通文件:name：[tcp] 總文件數為：13

C++

#include <iostream> #include <string> using namespace std; #include <sys/types.h> #include <fcntl.h> #include <unistd.h> #include <dirent.h> #include <sys/wait.h> #include <sys/types.h> #include <dirent.h>void search(string commonXmlPath){ {string ectPath = commonXmlPath;string subDistrictXmlPath;DIR* dir_pointer = opendir(ectPath.c_str());if (!dir_pointer)return;for (dirent* dp = readdir(dir_pointer); dp != NULL; dp = readdir(dir_pointer)){std::string filename = dp->d_name;if (filename == "." || filename == ".."){continue;}if (dp->d_type == 8)//?錄鎂{int split = filename.find('.');if (split == -1)continue;string pp = ectPath + filename;cout << pp.c_str() <<"\n";}if(dp->d_type == 4)//目錄攏盧?么錄?酶碌梅 {//每賂枚募鎂錄?路戮露subDistrictXmlPath = ectPath + string("/") + dp->d_name;search(subDistrictXmlPath);}}//closedir(dir_pointer); } int main(){search(string("/data/home/android/configserver/common_xmls/etc"));return 0; }

readdir_r():

注意：

這三個參數

#include <stdio.h> #include <sys/types.h> #include <dirent.h> #include <stdlib.h> int main(int argc, char **argv) {DIR *pDir = NULL;struct dirent * pEnt = NULL;struct dirent *entry = (struct dirent *)malloc(sizeof(struct dirent));struct dirent **result = (struct dirent **)malloc(sizeof(struct dirent));unsigned int cnt = 0;unsigned int ret = 0; if (argc != 2){printf("usage: %s dirname\n", argv[0]);return -1;}pDir = opendir(argv[1]);if (NULL == pDir){perror("opendir");return -1;}ret = readdir_r(pDir , entry , result);printf("return :%d \n", ret);printf("name :[%s] \n", entry->d_name);printf("name :[%s] \n", result[0]->d_name);ret = readdir_r(pDir , entry , result);printf("return :%d \n", ret);printf("name :[%s] \n", entry->d_name);printf("name :[%s] \n", result[0]->d_name);return 0;}

結果：

總結

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