read & write Binary data
 

hi
i need to r write binary(hexadecimal) values into a text file then read this data and manipulate it as a number
:sad:

Re: read & write Binary data
 

So is it binary or is it text? Do you mean that you want to write the binary text representation of a value and read this text back as its value?

Re: read & write Binary data
 

i write a hexadecimal value on a file using "ofstream" then i want to read this value from a file (may be as a string) and then convert it to its hexadecimal value then manipulate it(i.e add,subtract...........)
so can i do that?

Re: read & write Binary data
 

#include <iostream>

#include <fstream>



void write(const char *filename)

{

   std::ofstream file(filename);

   for ( int i = 100; i < 110; ++i )

   {

      file << std::hex << i << '\n';

   }

}



void read(const char *filename)

{

   std::ifstream file(filename);

   int value;

   while ( file >> std::hex >> value )

   {

      std::cout << "value = " << value << '\n';

   }

}



int main()

{

   static const char filename[] = "file.txt";

   write(filename);

   read(filename);

   return 0;

}



/* my output

value = 100

value = 101

value = 102

value = 103

value = 104

value = 105

value = 106

value = 107

value = 108

value = 109

*/



/* file.txt

64

65

66

67

68

69

6a

6b

6c

6d

*/