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// basic_ostream_seekp.cpp
// compile with: /EHsc
#include <fstream>
#include <iostream>
int main()
{
using namespace std;
ofstream x("basic_ostream_seekp.txt");
streamoff i = x.tellp();
cout << i << endl;
x << "testing";
i = x.tellp();
cout << i << endl;
x.seekp(2); // Put char in third char position in file
x << " ";
x.seekp(2, ios::end); // Put char two after end of file
x << "z";
}
看MSDN的意思是文件的开头,经测试没错
自己动手调试看看