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C-/C++-Quelltext

void writeToFile(const char *fname, void *data, size_t length, size_t offset){
   FILE   *stream;
   
   stream = fopen(fname, "wb");
   if (!stream)//fehler

      return;

   fseek(stream, offset, SEEK_SET);
   fwrite(data, 1, length, stream);
   fclose(stream);
}

void readFromFile(const char *fname, void *data, size_t length, size_t offset){
   FILE   *stream;
   
   stream = fopen(fname, "rb");
   if (!stream)//fehler

      return;

   fseek(stream, offset, SEEK_SET);
   fread(data, 1, length, stream);
   fclose(stream);

}

C-/C++-Quelltext

#include <iostream>
#include <fstream>

    // Die Teststruktur

struct superbool
{
    unsigned char bool0 : 1;
    unsigned char bool1 : 1;
    unsigned char bool2 : 1;
    unsigned char bool3 : 1;
    unsigned char bool4 : 1;
    unsigned char bool5 : 1;
    unsigned char bool6 : 1;
    unsigned char bool7 : 1;
};  // Struktur ist 1 Byte groß


int main (void)
{
    ::superbool struct_out;

    struct_out.bool0 = 1;
    struct_out.bool1 = 1;
    struct_out.bool2 = 1;

        // Schreiben

    ::std::basic_fstream<char> out ("test.bin", ::std::ios::binary | ::std::ios::out);
    out.write (reinterpret_cast<char*>(&struct_out), sizeof(::superbool));

    // ############################################


    ::superbool struct_in;

        // Lesen

    ::std::basic_fstream<char> in ("test.bin", ::std::ios::binary | ::std::ios::in);
    in.read (reinterpret_cast<char*>(&struct_in), sizeof(::superbool));

    return 0;
}