tellg
函数示例
ifstream file;
char c;
streamoff i;
file.open("basic_istream_tellg.txt");//文件内容:0123456789
i = file.tellg();
file >> c;
cout << c << " " << i << endl;
输出：
0 0
tellp(io)函数
函数定义
pos_type tellp();
函数说明
用于输出流，返回当前流中‘put’
指针
的位置。
函数示例
string str(“test”);
ofstream fout(“e:\\output.txt”);
int k;
for(k = 0; k < str.length(); k++)
{
cout<<”File point:”<<fout.tellp();
fout.put(str[k]);
cout <<” “<<str[k]<<
endl
;
}
fout.close();
输出：
File point:0 t
File point:1 e
File point:2 s
File point:3 t
// obtaining file size
#include <iostream.h>
#include <fstream.h>
const char * filename = "example.txt";
int main () {
long l,m;
ifstream file (filename,
ios::in|ios::binary);
l = file.tellg();
file.seekg (0, ios::end);
m = file.tellg();
file.close();
cout << "size of " << filename;
cout << " is " << (m-l) << "
return 0;
}
