Question

我为另一个主程序编写了这个头文件。该文件声明了main函数（其他地方）使用的struct_buffer结构。

我想要做的是当有人使用buffer_init函数初始化缓冲区时，会返回指向缓冲区的指针。缓冲区将包含一个指针数组，缓冲区中当前指针数（大小），以及指向缓冲区中存储指针的文件的文件指针。

主程序将调用add_to_buffer（）函数来添加指向缓冲区的指针。这反过来调用buffer_dump（）函数将指针转储到buffer-＆gt; fp指定的文件中。最后，我将调用buffer_close（）来关闭文件。然而，编译它给了我一些我无法理解和摆脱的错误。

以下是C中的头文件代码，我正在尝试编译，它给了我无法理解的错误。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_PTRS 1000

struct struct_buffer
{
    int size;
    File *fp;
    unsigned long long ptrs[MAX_PTRS];
};

//The struct_buffer contains the size which is the number of pointers in ptrs, fp is the file pointer to the file that buffer will write 
struct struct_buffer*
buffer_init(char *name)
{
    struct struct_buffer *buf = malloc(sizeof(struct struct_buffer));
    buf->size = 0;
    buf->fp = fopen(name,"w");
    return buf;
}

//This function dumps the ptrs to the file.
void
buffer_dump (struct struct_buffer *buf)
{
  int ctr=0;
  for(ctr=0; ctr < buf->size ; ctr++)
  {
    fprintf(buf->fp, "%llx\n",buf->ptrs[ctr]);
  }
}

//this function adds a pointer to the buffer
void
add_to_buffer (struct struct_buffer *buf, void *ptr)
{
 if(buf->size >= MAX_PTRS)
 {
  buffer_dump(buf);
  buf->size=0;
 }
 buf->ptrs[(buf->size)++] = (unsigned long long)ptr;
}

//this functions closes the file pointer
void
buffer_close (struct struct_buffer *buf)
{
 fclose(buf->fp);
}

以上编译代码给出了以下错误。我无法理解这个问题。请向我解释一下麻烦是什么。

buffer.h:10: error: expected specifier-qualifier-list before 'File'
buffer.h: In function 'buffer_init':
buffer.h:19: error: 'struct struct_buffer' has no member named 'fp'
buffer.h: In function 'buffer_dump':
buffer.h:29: error: 'struct struct_buffer' has no member named 'fp'
buffer.h:29: error: 'struct struct_buffer' has no member named 'ptrs'
buffer.h: In function 'add_to_buffer':
buffer.h:40: error: 'struct struct_buffer' has no member named 'ptrs'
buffer.h: In function 'buffer_close':
buffer.h:46: error: 'struct struct_buffer' has no member named 'fp'

Answer 1

File未定义。您正在寻找的正确类型是FILE。

struct struct_buffer
{
    int size;
    FILE *fp; // <---------
    unsigned long long ptrs[MAX_PTRS];
};

其他错误似乎是此错误的产物，因此这应该是您唯一的解决方法。

错误：“文件”之前的预期说明符限定符列表

1 个答案: