1 #include
     
       2 #include
      
        3  4 void copy(char* src, char* dst); 5 int main() 6 { 7     using namespace std; 8     char src[50] = "E:/test/jdk-8u121-windows-x64.exe"; 9     char dst[50] = "E:\\test\\jdk-8u121-windows-x64_bak.exe";10     copy(src, dst);11     12     return 0;13 }14 15 void copy(char* src, char* dst)16 {17     using namespace std;18     ifstream in(src,ios::binary);19     ofstream out(dst,ios::binary);20     if (!in.is_open()) {21         cout << "error open file " << src << endl;22         exit(EXIT_FAILURE);23     }24     if (!out.is_open()) {25         cout << "error open file " << dst << endl;26         exit(EXIT_FAILURE);27     }28     if (src == dst) {29         cout << "the src file can't be same with dst file" << endl;30         exit(EXIT_FAILURE);31     }32     char buf[2048];33     long long totalBytes = 0;34     while(in)35     {36         //read从in流中读取2048字节，放入buf数组中，同时文件指针向后移动2048字节37         //若不足2048字节遇到文件结尾，则以实际提取字节读取。38         in.read(buf, 2048);    39         //gcount()用来提取读取的字节数，write将buf中的内容写入out流。40         out.write(buf, in.gcount());    41         totalBytes += in.gcount();42     }43     in.close();44     out.close();45 }