Re: [Dev-C++] A bit stumped on binary files

[Jorge A. <jor...@ep...>]

In fopen you can specify a binary stream with the b modifier in the=20
wanted open type (glibc reference).

Ewald Horn escribi=F3:

> Hi,
> =20
> I use the attached code to output a struct to a binary file.=20
> Outputting character arrays is no problem, but how do I output an=20
> integer value in bytes and not a string value ? I will be using the=20
> Win32 platform, 32-bit integer, so portability is no issue. Is there=20
> an easy way to do it that would simply output the required 4 bytes ?=20
> My current test solution converts a number to a 10 digit string,=20
> padded with 0's like this : 10 would be 0000000010, but it is clumsy!
> =20
> Regards
> Ewald Horn
> Proprietor/Eienaar : Horn Labs
> Cell/Sel : 083 519 1615
> Website : http://www.hornlabs.co.za
> Email/E-pos : in...@ho... <mailto:in...@ho...>
> =20
> //[code]
> =20
> #include <fstream>
> #include <string.h>
> =20
> using namespace std;
> =20
> struct MyStruct
> {
>   char name[40];
>   char surname[40];
>   int age;
> };=20
> =20
> // global
> ofstream myFile("tmp.out",ios::out | ios::binary);
> =20
> void writeStruct(MyStruct);
> int main()
> {
>   MyStruct data[3] =3D {0};
>  =20
>   for (int i =3D 0; i < 3; i++)
>     writeStruct(data[i]);
> =20
>   myFile.close();
> =20
>   return 0;
> }=20
> =20
> void writeStruct(MyStruct strc)
> {
>   for (int i =3D 0; i < sizeof(strc.name); i++)
>     myFile.put(strc.name[i]);
> =20
>   for (int i =3D 0; i < sizeof(strc.surname); i++)
>     myFile.put(strc.surname[i]);
> // problem area follows   =20
>   myFile << strc.age;
> }=20
> //[end code]