逐行读取文件内容的三种方法

测试用数据：

方法一：采用Getline函数

ifstream in("1.txt");  string line;  int i = 0;if(in) // 有该文件  {  while (getline (in, line)) // line中不包括每行的换行符  {   cout << line<<"    "<<i++<<endl;   }  }  else // 没有该文件  {  cout <<"no such file" << endl;  }  return 0;

方法二、采用fscanf进行格式化读取

char szSrcFile[_MAX_PATH] = {0},szDstFile[_MAX_PATH] = {0};FILE* fp = fopen("1.txt", "rt");if (fp){while(EOF != fscanf(fp, "%s\t%s\n", szSrcFile, szDstFile)){cout<<szSrcFile<<"  "<<szDstFile<<endl; }fclose(fp);fp = NULL;}else{cout<<"fopen() error !"<<endl;}

方法三：

char szbuf[MAX_PATH] = {0};FILE* fp = fopen("1.txt", "rt");if (fp){while (fgets(szbuf,MAX_PATH,fp) != NULL){cout<<szbuf;}fclose(fp);fp = NULL;} else{cout<<"打开文件失败！"<<endl;}