把结构体与数组之间的转换

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最新推荐文章于 2024-03-27 16:58:18 发布

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分类专栏：编程小记文章标签：强制类型装换

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二维数组和一维数组的转换很简单，直接是强制转换即可，例如：

#include<stdio.h>
#include<string.h>
unsigned char aa[4][4] = {{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};

int main(){
int i;

   for(i = 0;i < 16;i++){
       printf("%d ",((unsigned char *)aa)[i]);
   }

}

打印结果：

如果是定义一个结构体呢：

struct cc
{
unsigned char data1[6];
unsigned char data2;
unsigned char data3;
unsigned char data4[31];
};

main函数里面定义变量初始化

   struct cc dd = {
       .data1 = {1,2,3,4,5,6},
       .data2 = 7,
       .data3 = 8,
       .data4 = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1}

   };

   for(i = 0;i < 39;i++){
       printf("%d ",((unsigned char *)&dd)[i]);
   }

打印结果：

如果是结构体里面套结构体呢？

下面给一个完整可以运行的程序：

#include<stdio.h>
#include<string.h>
unsigned char aa[4][4] = {{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};
struct cc
{
unsigned char data1[6];
unsigned char data2;
unsigned char data3;
unsigned char data4[31];
};
struct ee{
   struct cc ff[4];
};
int main(){
   int i;
   struct cc dd = {
       .data1 = {1,2,3,4,5,6},
       .data2 = 7,
       .data3 = 8,
       .data4 = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1}

   };
   struct ee bb = {
       .ff = {
               {
                   .data1 = {1,2,3,4,5,6},
                   .data2 = 7,
                   .data3 = 8,
                   .data4 = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1}
               },
               {   .data1 = {1,2,3,4,5,6},
                   .data2 = 7,
                   .data3 = 8,
                   .data4 = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1}
               },
               {
                   .data1 = {1,2,3,4,5,6},
                   .data2 = 7,
                   .data3 = 8,
                   .data4 = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1}
               },
               {
                   .data1 = {1,2,3,4,5,6},
                   .data2 = 7,
                   .data3 = 8,
                   .data4 = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1}
               }
       }
   };


   for(i = 0;i < 16;i++){
       printf("%d ",((unsigned char *)aa)[i]);
   }
   printf("\n\n");
   for(i = 0;i < 39;i++){
       printf("%d ",((unsigned char *)&dd)[i]);
   }

   printf("\n\n");
   for(i = 0;i < 39*4;i++){
       printf("%d ",((unsigned char *)&bb)[i]);
   }
}

打印结果：