C++中读写二进制与ASCII混合文本流测试

2013100301.cpp

#include <iostream>
#include <fstream>
#include <string>
 
using namespace std;
int main(int argc, char* argv[])
{
    ofstream fout;
 
    int n=31;
    double v=9.9998e-79;
    string str="Hello,World!";
 
    cout<<"Before"<<endl;
    cout<<"n="<<n<<","<<"v="<<v<<endl;
    cout<<str<<endl;
 
    fout.open("test.out",ios::binary);
    if(!fout.good())
    {   cout<<"CANNOT OPEN FILE FOR WRITE!"<<endl; return 1;}
    fout.write( (char*)&n ,sizeof(n));
    fout.write( (char*)&v ,sizeof(v));
 
    fout.seekp( 1024, ios::beg);
    fout<<"Hello,World!"<<endl;
    fout.close();
 
    n=38;v=3.14159265354;
    str="FAIL";
 
    ifstream fin("test.out",ios::binary);
    if(!fin.good())
    {   cout<<"CANNOT OPEN FILE FOR READ!"<<endl; return 1;}
    fin.read( (char*)&n ,sizeof(n));
    fin.read( (char*)&v ,sizeof(v));
    cout<<"After"<<endl;
    cout<<"n="<<n<<","<<"v="<<v<<endl;
 
    fin.seekg( 1024, ios::beg);
    getline(fin,str);
    cout<<str<<endl;
    fin.close();
 
    system("pause");
    return 0;
}