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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -59,4 +59,6 @@ int main( int argc, char ** argv) cout << thedoubles[i] << ' '; } cout << '\n'; in.close(); } -
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,62 @@ /* Example of how to write binary stuff in C++ Illustrates some of the various quirks/annoyances */ #include <iostream> #include <fstream> #include <string> #include <vector> using namespace std; int main( int argc, char ** argv) { string X("Hi there"); unsigned Y = 11; vector<double> Z(10,1.0); ofstream o("binary_out_test.bin",ios_base::binary); //To write a string, print out its length, and then the char * //However, X.size() is a temp, and you cannot write a temp, //so you need a new variable. unsigned Xsize = X.size(); //The next line is how you write most types: cast a pointer to a type to a char * and give sizeof the type o.write ( reinterpret_cast<char *>(&Xsize),sizeof(unsigned) ); o.write ( X.c_str(), Xsize*sizeof(char) ); //Write out that vector //Take advantages of the fact that &vector<T>[0] is a pointer to type T. //gotta write out the size first!!! Xsize=Z.size(); o.write ( reinterpret_cast<char *>(&Xsize),sizeof(unsigned) ); o.write( reinterpret_cast<char *>(&Z[0]), Z.size()*sizeof(double) ); o.close(); //Now, read it all back in ifstream in("binary_out_test.bin",ios_base::binary); unsigned stringsize; in.read( reinterpret_cast<char *>(&stringsize),sizeof(unsigned) ); //Cannot read to a string directly, must have buffer intermediate vector<char> temp(stringsize); in.read( reinterpret_cast<char *>(&temp[0]), stringsize*sizeof(char) ); string thestring(temp.begin(),temp.end()); unsigned vsize; in.read( reinterpret_cast<char *>(&vsize),sizeof(unsigned) ); vector<double> thedoubles(vsize); in.read( reinterpret_cast<char *>(&thedoubles[0]), vsize*sizeof(double) ); cout << stringsize << ' ' << thestring << '\n' << vsize << ' '; for(unsigned i = 0 ; i < thedoubles.size() ; ++i ) { cout << thedoubles[i] << ' '; } cout << '\n'; }