1

任何人都可以发现我在这里缺少什么吗？该代码块应该递归访问目录并存储目录路径和其中文件的路径。如果文件是目录，它将 fprintf() 为 true，如果文件不是目录，则为 false。奇怪的是，fileName 的 printf 例程工作正常，但是当将 fprintf fileName 打印到文件时，它只是在应该打印 fileName 的地方打印一个换行符。

/* List the files in "dir_name". */
static void listDir(const char *dirName)
{
DIR *dir;

/* 
 * Open the directory specified by "dirName". 
 */

dir = opendir(dirName);

/* 
 * Check it was opened. 
 */
if (!dir) {
    fprintf(stderr, "Cannot open directory '%s': %s\n",
            dirName, strerror(errno));
    exit(EXIT_FAILURE);
}
while (1) {
    struct dirent *entry;
    const char *dir_name;

    /* 
     * "Readdir" gets subsequent entries from "d". 
     */
    entry = readdir(dir);
    if (!entry) {
        /* 
         * There are no more entries in this directory, so break out of the while loop. 
         */
        break;
    }
    dir_name = entry->d_name;
    char fileName[PATH_MAX];
            // Assign fileName to path if the file is not a directory
    if (entry->d_type != DT_DIR) {
        if (strcmp(dirName, "/") != 0) {
            snprintf(fileName, PATH_MAX,
                                   "%s/%s", dirName, dir_name);
        } else {
            snprintf(fileName, PATH_MAX,
                                   "%s%s", dirName, dir_name);
        }
    }
    /* Access directory and leave out /. and /.. in the process
     */

    if (entry->d_type == DT_DIR) {

        /* 
         * Check that the directory is not "d" or d's parent. 
         */

        if (strcmp(dir_name, "..") != 0 && strcmp(dir_name, ".") != 0) {
            int path_length;
            char path[PATH_MAX], indexPath[PATH_MAX];
            if (strcmp(dirName, "/") != 0) {
                path_length = snprintf(path, PATH_MAX,
                                       "%s/%s", dirName, dir_name);
            } else {
                path_length = snprintf(path, PATH_MAX,
                                       "%s%s", dirName, dir_name);
            }
            strcpy(indexPath, path);
            strcat(indexPath, "/masterIndex.db");
            FILE *fp;
            if ((fp = fopen(indexPath, "a")) == NULL) {
                printf("Cannot open file\n");
                return;
            }

            printf("File: %s\n      (TRUE)\n", path);
            printf("File: %s\n      (FALSE)\n", fileName); // This routine prints fileName correctly
            fprintf(fp, "%s\n", path);
            fprintf(fp, "%s\n", "true");
            fprintf(fp, "%s\n", fileName); // This routine prints a newline where fileName is supposed to be
            fprintf(fp, "%s\n", "false");
            fclose(fp);

            // Activate this for screw ups
            /*
            char command[PATH_MAX];
            strcpy(command, "cd ");
            strcat(command, path);
            strcat(command, " && rm abc *.finderDB .DS_Store");
            printf("%s\n", command);
            system(command);*/

            if (path_length >= PATH_MAX) {
                fprintf(stderr, "Path length has gotten too long.\n");
                exit(EXIT_FAILURE);
            }
            /* 
             * Recursively call "list_dir" with the new path. 
             */
            listDir(path);
        }
    }
}
/* 
 * After going through all the entries, close the directory. 
 */
if (closedir(dir)) {
    fprintf(stderr, "Could not close '%s': %s\n",
            dirName, strerror(errno));
    exit(EXIT_FAILURE);
}
}
4

3 回答 3

1

system("cd any_path")不会对调用过程产生任何影响；改用chdir()..

于 2013-06-05T15:04:24.513 回答
1

您在fileName这里缺少初始化：

 char fileName[PATH_MAX];

修改这样的行：

 char fileName[PATH_MAX] = "";

不这样做可能会导致访问未初始化的变量，即未定义的行为，并可能导致任何或多或少的理性或非理性。

于 2013-06-05T17:32:08.630 回答
0

这是我设法修复的工作代码。仍然不知道错误是什么，但这应该适用于 POSIX 系统。不确定Windows。感谢 alk 的初始化建议，chidir() 的 xtof （我还没有实现）和 twalberg 解释 chdir() 的作用。

/* List the files in "dir_name". */
static void listDir(const char *dirName)
{
DIR *dir;

/* 
 * Open the directory specified by "dirName". 
 */

dir = opendir(dirName);

/* 
 * Check it was opened. 
 */
if (!dir) {
    fprintf(stderr, "Cannot open directory '%s': %s\n",
            dirName, strerror(errno));
    exit(EXIT_FAILURE);
}
while (1) {
    struct dirent *entry;
    const char *dir_name;

    /* 
     * "Readdir" gets subsequent entries from "d". 
     */
    entry = readdir(dir);
    if (!entry) {
        /* 
         * There are no more entries in this directory, so break out of the while loop. 
         */
        break;
    }
    dir_name = entry->d_name;

    if (entry->d_type != DT_DIR) {
        char fileName[PATH_MAX] = "", indexPath[PATH_MAX] = "";
        if (strcmp(dirName, "/") != 0) {
            sprintf(fileName, "%s/%s", dirName, dir_name);
        } else {
            sprintf(fileName, "%s%s", dirName, dir_name);
        }

        strcpy(indexPath, dirName);
        strcat(indexPath, "/masterIndex.db");

        // We don't want to include masterIndex.db in the index list right?
        if (strcmp(indexPath, fileName) != 0) {

            FILE *fp;
            fp = fopen(indexPath, "a");
            if (fp == NULL) {
                printf("Cannot open file\n");
            }

            printf("File: %s\n      (FALSE)\n", fileName);
            fprintf(fp, "%s\n", fileName);
            fprintf(fp, "%s\n", "false");
            fclose(fp);
        }
    }
    /* 
     * See if "entry" is a subdirectory of "dir". 
     */

    if (entry->d_type == DT_DIR) {

        /* 
         * Check that the directory is not "d" or d's parent. 
         */

        if (strcmp(dir_name, "..") != 0 && strcmp(dir_name, ".") != 0
            && strcmp(dir_name, "tmp") != 0
            && strcmp(dir_name, "Jarvis") != 0) {
            int path_length;
            char path[PATH_MAX] = "", indexPath[PATH_MAX] = "";

            if (strcmp(dirName, "/") != 0) {
                path_length = sprintf(path,
                                      "%s/%s", dirName, dir_name);
            } else {
                path_length = sprintf(path, "%s%s", dirName, dir_name);
            }
            strcpy(indexPath, path);
            strcat(indexPath, "/masterIndex.db");
            FILE *fp;
            fp = fopen(indexPath, "a");
            if (fp == NULL) {
                printf("Cannot open file\n");
            }

            printf("File: %s\n      (TRUE)\n", path);
            fprintf(fp, "%s\n", path);
            fprintf(fp, "%s\n", "true");
            fclose(fp);

            // Activate this for screw ups
            /*
               char command[PATH_MAX];
               strcpy(command, "cd ");
               strcat(command, path);
               strcat(command, " && rm abc *.finderDB .DS_Store");
               printf("%s\n", command);
               system(command); */

            if (path_length >= PATH_MAX) {
                fprintf(stderr, "Path length has gotten too long.\n");
                exit(EXIT_FAILURE);
            }
            /* 
             * Recursively call "list_dir" with the new path. 
             */
            listDir(path);
        }
    }
}
/* 
 * After going through all the entries, close the directory. 
 */
if (closedir(dir)) {
    fprintf(stderr, "Could not close '%s': %s\n",
            dirName, strerror(errno));
    exit(EXIT_FAILURE);
}
}
于 2013-06-06T03:59:20.790 回答