#include <cstdio> #include <fstream> int main(int argc, char * argv[]) { if (3 != argc) { printf("usage: %s src dst\n", argv[0]); return(1); } std::ifstream ifs(argv[1], std::ios::binary); if (!ifs.is_open()) { printf("open %s failed\n", argv[1]); return(2); } std::ofstream ofs(argv[2], std::ios::binary | std::ios::trunc); if (!ofs.is_open()) { printf("create %s failed\n", argv[2]); return(3); } ofs << ifs.rdbuf(); ofs.close(); ifs.close(); return(0); }
既然使用了fstream,说个问题:判断文件是否正常打开时,用对象来判断是不对的,应该用is_open函数。
再压缩下代码:
#include <fstream> int main(int argc, char * argv[]) { if (3 != argc) { printf("usage: %s src dst\n", argv[0]); return(1); } std::ofstream(argv[2]) << std::ifstream(argv[1]).rdbuf(); return(0); }