Pfthb

I am not very used to work with a file, but when is necessary to write strings or normal variables, I don't find any problem to put them inside a binary file. However, I have tried several times to save the content of a pointer to pointer (actually, an array of strings) inside a b-file and all the time or my compiler showed an error or just crashed. Does someone have an idea of how to make it work?

A simplified version of the code is down there:

int main()
 int n;
 scanf("%d", &n);

 char **campo2 = (char**)malloc(n*sizeof(char*));
 campo2[i] = (char*)malloc(20*sizeof(char));

 for(int i = 0; i< n; i++)
 campo2[i] = foo();
 

 FILE *binaryFile = fopen("file.bin", "wb");

 if (binaryFile =! NULL)
 for(int i = 0;i<n;i++)
 fwrite(campo2[i], 20*sizeof(char),1,binaryFile);
 
 

 return 0;
 

You probably want something like

char * foo(int i)

 char *s= malloc(20);
 fprintf(s,"%018drn",i);
 return s;

int main()

 int n;
 scanf("%d", &n);

 char **campo2 = (char**)malloc(n*sizeof(char*));

 for(int i = 0; i< n; i++)
 campo2[i] = foo(i);
 

 FILE *binaryFile = fopen("file.bin", "wb");

 if (binaryFile =! NULL)
 for(int i = 0;i<n;i++)
 fwrite(campo2[i], 20,1,binaryFile);
 
 fclose(binaryFile);
 
 return 0;