C 编程:取消引用指向不完整类型错误的指针 [英] C programming: Dereferencing pointer to incomplete type error

问题描述

我有一个结构定义为:

struct {
 char name[32];
 int  size;
 int  start;
 int  popularity;
} stasher_file;

以及指向这些结构的指针数组:

and an array of pointers to those structs:

struct stasher_file *files[TOTAL_STORAGE_SIZE];

在我的代码中，我创建了一个指向结构的指针并设置其成员，并将其添加到数组中:

In my code, I'm making a pointer to the struct and setting its members, and adding it to the array:

 ...
 struct stasher_file *newFile;
 strncpy(newFile->name, name, 32);
 newFile->size = size;
 newFile->start = first_free;
 newFile->popularity = 0;
 files[num_files] = newFile;
 ...

我收到以下错误:

错误:解引用指向不完整类型的指针

error: dereferencing pointer to incomplete type

每当我尝试访问 newFile 中的成员时.我做错了什么?

whenever I try to access the members inside newFile. What am I doing wrong?

推荐答案

您还没有通过您的第一个定义定义 struct stasher_file.您定义的是一个 nameless 结构类型和该类型的变量 stasher_file.由于您的代码中没有像 struct stasher_file 这样的类型的定义，编译器会抱怨类型不完整.

You haven't defined struct stasher_file by your first definition. What you have defined is an nameless struct type and a variable stasher_file of that type. Since there's no definition for such type as struct stasher_file in your code, the compiler complains about incomplete type.

为了定义struct stasher_file，你应该这样做

In order to define struct stasher_file, you should have done it as follows

struct stasher_file {
 char name[32];
 int  size;
 int  start;
 int  popularity;
};

注意 stasher_file 名称在定义中的位置.

Note where the stasher_file name is placed in the definition.

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