嘗試創建 2D 動態結構數組時出錯

Question

我必須創建一個二維動態結構數組並從二進制文件中讀取這些結構。 編譯器給我以下錯誤： "error: incompatible types when assigning to type 'S_Apartament {aka struct <anonymous>}' from type 'size_t {aka unsigned int}'" 。嘗試訪問數組的元素時。 代碼：

#include "Header.h"

int main()
{
    printf("Hello world!\n");
    FILE *f;
    f = fopen("Block.bin", "rb");
    if(f == NULL)
    {
        printf("Error opening file");
        fclose(f);
        exit(1);
    }
    S_Apartament Flats;
    unsigned int floor=0, flats_per_floor=0; // Declaring dimensons of the array
    fread(&floor,sizeof(unsigned),1,f);
    fread(&flats_per_floor,sizeof(unsigned),1,f);
    S_Apartament **ptr = (S_Apartament **)malloc(sizeof(S_Apartament*) * floor);//Declaring an array of pointers
    for (int i = 0; i <  floor; i++)
    {
        ptr[i] = (S_Apartament*)malloc(sizeof(S_Apartament)*flats_per_floor);//Each pointer in the array becomes an array of structures.
    }
    for(int i = 0; i <  floor; i++)
    {
        for(int j = 0; j < flats_per_floor; j++)
        {
            ptr[i][j]=fread(&Flats,sizeof(S_Apartament),1,f);//Trying to access the array, in order to read from the binary file.
        }
    }
    fclose(f);


    return 0;
}

Header 文件：

#ifndef HEADER_H_INCLUDED
#define HEADER_H_INCLUDED
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct
{
   unsigned int Flat_ID;
   unsigned int count_Rooms;
   unsigned int count_Adults;
   unsigned int count_Children;
   char Family_Surname[20];
   unsigned int day_of_entry;
   unsigned int month_of_entry;
   unsigned int year_of_entry;
   float rent;
   int occupancy;
}S_Apartament;
#endif // HEADER_H_INCLUDED

任何幫助，將不勝感激！

Answer 1

您可以嘗試“S_Apartament ptr = (S_Apartament **)malloc(sizeof(S_Apartament ) * floor)”。 sizeof (S_Apartament**) 不是 sizeof (S_Apartament*)。

Answer 2

ptr[i][j]=fread(&Flats,sizeof(S_Apartament),1,f);

fread返回size_t類型（讀取或寫入的項目數），但在您的代碼中ptr[i][j]具有類型： S_Apartament 。

您的程序引發錯誤，因為您嘗試將 integer 值（ fread的返回）分配給S_Apartament值（ ptr[i][j] ）