如何将动态分配的多维结构数组写入文件？

Question

The struture

struct str
{
  int a;
  char b[20];
  int c;
}

declaration

struct str ** str_array=0;

allocation and initialization(use)

str_array= new struct str*[100];
for(int i=0;i<100;++i)
   str_array[i]=new struct str[1000];

for(int i=0;i<100;++i)
   for(int j=0;j<1000;++j;
      str_array[i][j].a=j;
       .....

now I tried to write content of array like

for(int i=0;i<100;++i)
   for(int j=0;j<1000;++j;
     fwrite(str_array[i][j],sizeof(str),1,fname);

Problem

no suitable conversion from str to const void* exists

I intend to read it with same style.

Answer 1

Change:

 fwrite(str_array[i][j],sizeof(str),1,fname);

to:

 fwrite(&str_array[i][j],sizeof(str),1,fname);