#include<iostream>
#include<fstream>
using namespace std;
int main()
{
char ch1;
ofstream outFile("d:\\vs c++ document\\first-35\\file1.txt",ios::out);
if(!outFile)
{cout<<"文件打开错误!";return 0;}
outFile<<"I am a file.Please read me.";
cout<<"文件内容I am file.Please read me."<<endl;
outFile.close();
ifstream inFile("d:\\vs c++ doucument\\first-35\\file1.txt",ios::in);
if(!inFile)
{cout<<"文件打开错误!";goto Exit;}
streampos pos=inFile.tellg();
cout<<"当前文件指针位置:"<<pos;
inFile.get(ch1); cout<<",字符"<<ch1<<endl;
pos=inFile.tellg();
cout<<"读取一个字符后文件指针位置:"<<pos<<endl;
inFile.seekg(5,ios::beg);
pos=inFile.tellg();
cout<<"后移5个字符后文件指针位置:"<<pos;
inFile.get(ch1); cout<<",字符"<<ch1<<endl;
pos=inFile.tellg();
cout<<"读取一个字符后文件指针位置:"<<endl;
pos=pos+(streampos)19;
inFile.seekg(pos);
cout<<"后移19个字符后文件指针位置:"<<pos;
inFile.get(ch1);cout<<",字符"<<ch1;
inFile.get(ch1);cout<<ch1<<endl;
inFile.close();
Exit:
return 0;
}
程序在ifstream那里读取文件失败。