读写文本文件 C++ Builder 实现

#include <fstream> #include <iostream> using namespace std; #include <vcl.h> #pragma hdrstop #include "Unit1.h" // --------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; // --------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } // --------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { // 读文本文件 char* ch = new char[80]; char fname[255] = "a.txt"; ifstream in(fname); // 打开文件读 Memo1->Clear(); if (!in) { Memo1->Lines->Add("文件打开失败！"); } else { while (in.getline(ch, 80)) // getline按行读取，返回流对象 Memo1->Lines->Add(ch); // 读入内容输出到Memo1 } delete ch; in.close(); } // --------------------------------------------------------------------------- struct STUDENT // 学生结构体 { char strName[20]; // 姓名 int nGrade; // 成绩 }; void __fastcall TForm1::Button2Click(TObject *Sender) { // 写文本文件 ofstream out; out.open("a.txt"); // 打开或创建a.txt文本文件 STUDENT st1 = {"张 三", 90}; STUDENT st2 = {"李 四", 80}; // ----------把成绩信息存到文本文件--------------- out << st1.strName << "\t" << st1.nGrade << endl; out << st2.strName << "\t" << st2.nGrade << endl; out.close(); // 关闭文件 } // ---------------------------------------------------------------------------