访问结构的指针数组

Question

我正在从事C编程中的作业，并且有一些理解上的困难。我创建了一个应该创建文件夹或文件的函数（仅包含字符串）。如果新对象是一个文件夹，我想递归输入子文件的数量。

[问题：如果要使用第二个文件（仅字符串）的数据，如何访问子文件？ （以及访问子文件夹）。

文件结构：

typedef struct {
    char *name;                    //name of File
    char type;                    // 'f' - data file, 'd'-folder.
    union {
        char data[5];             //f -80 chars array for content of file.
        struct {                //d -arry of pointers to 'File' Files.
            struct File ** files;
            unsigned int size;
        }folder;
    }content;
}File;

功能：

File * newFile(char type)
{
    File *pfile = (File*)malloc(sizeof(File)); //creating new File
    if (!pfile) {
        printf("No memory for new file\n");
        exit(1);
    }
    if (type != 'f' || type != 'd') { // in case of wrong input of type.
        while(type != 'f' && type !='d'){
        printf("Wrong input,try again: ");
        fseek(stdin, 0, SEEK_END);
        type =getchar();
        }
    }
    printf("Enter File name: ");
    fseek(stdin, 0, SEEK_END);
    char name[NAME];
    gets(name);
    pfile->name = name;
    if (type == 'f') {      // New File is 'folder'
        pfile->type = 'f';
        //fseek(stdin, 0, SEEK_END);
        printf("Enter number of files in %s: ",pfile->name);

        scanf(" %d", &pfile->content.folder.size);
        if (pfile->content.folder.size == 0) { // Zero files in the folder
            pfile->content.folder.files = NULL; // No more files / empty folder
        }
        pfile->content.folder.files = (File**)malloc(pfile->content.folder.size * sizeof(File));
        if (!pfile->content.folder.files) {
            printf("No memory for sub files\n");
            exit(2);
        }

        for (int i = 0; i < pfile->content.folder.size; ++i) { // creates 'size' file per folder
            fseek(stdin, 0, SEEK_END);
            printf("(%d):Enter type of file (d-folder,f-file): ", i + 1);

            pfile->content.folder.files[i] = newFile(getchar());
        }
        return pfile;

    }
    else if (type == 'd') { //File creation
        pfile->type = 'd';
        printf("Enter file's text:\n");
        scanf(" %s", &pfile->content.data);
    }
    return pfile;

Answer 1

我相信这是问题所在：

if (type != 'f' || type != 'd') { // in case of wrong input of type.
    while(type != 'f' && type !='d'){
    printf("Wrong input,try again: ");
    fseek(stdin, 0, SEEK_END);
    type =getchar();
    }
}

您应更改“ ||”就像在while循环中一样，在if到“ &&”中，您的问题应该得到解决，或者只是删除if并离开while循环。