fstream读写二进制文件

柯枫 — Tue, 12 Oct 2010 03:30:00 GMT

1 #include <iostream>
2 #include <fstream>
3
4 int main()
5 {
6     int length;
7     char *buffer;
8
9     std::fstream rfile;
10     rfile.open("test.txt",std::fstream::in|std::fstream::binary);
11     if(!rfile)
12     {
13         std::cerr<<"Open test.txt failed!"<<std::endl;
14         return -1;
15     }
16
17     //get length of file:
18     rfile.seekg(0,std::ios::end);
19     length = rfile.tellg();
20     rfile.seekg(0,std::ios::beg);
21     std::cout<<"length:"<<length<<std::endl;
22
23     //allocate memory:
24     buffer = new char[length];
25
26     //read data as a block:
27     rfile.read(buffer,length);
28     rfile.close();
29
30     //write to outfile
31     std::fstream wfile("new.txt",std::fstream::out|std::fstream::binary);
32     wfile.write(buffer,length);
33
34     //delete buffer
35     delete[] buffer;
36
37     //close rfile wfile
38     rfile.close();
39     wfile.close();
40
41     return 0;
42 }
43

柯枫 2010-10-12 11:30 发表评论

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fstream读写二进制文件