textprogram.cpp

C++ Builder 6 编程实例教程-北京希望电子出版社出版

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "TextProgram.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject *Sender)
{
Form1->Button1->Enabled=true;
Form1->Button2->Enabled=false;
Form1->Button3->Enabled=false;
Form1->Button4->Enabled=false;
//设置按钮有效性
Form1->Memo1->Clear();
//清除文本框
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button1Click(TObject *Sender)
{
if (Form1->OpenDialog1->Execute())
   //显示对话框
   {
    Form1->Button2->Enabled=true;
    Form1->Button3->Enabled=true;
    Form1->Button4->Enabled=true;
    //设置按钮有效状态
    }
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)
{
Form1->Memo1->Lines->LoadFromFile(Form1->OpenDialog1->FileName);
//显示文件内容
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button3Click(TObject *Sender)
{
if (Form1->Memo1->Modified)
   //判断文件是否被改变
   {
   if (MessageDlg("文件已经被修改过，存储修改后的结果吗？", mtConfirmation, TMsgDlgButtons() << mbYes << mbNo, 0) == mrYes)
       //提示用户是否保存修改结果
       {
       if (Form1->SaveDialog1->Execute())
          //显示对话框
          {
          Form1->Memo1->Lines->SaveToFile(Form1->SaveDialog1->FileName);
          //存储文件
          }
       }
   }
Form1->Memo1->Clear();
//清除文本框中的内容
Form1->Button2->Enabled=false;
Form1->Button3->Enabled=false;
Form1->Button4->Enabled=false;
//设置按钮有效状态
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button4Click(TObject *Sender)
{
Form1->SaveDialog1->Title="请存储为一个文本文件：";
//设置对话框标题
Form1->SaveDialog1->Filter="Text Files(*.txt)|*.txt";
//设置过滤器
if (Form1->SaveDialog1->Execute())
   //显示对话框
   {
   Form1->Memo1->Lines->SaveToFile(Form1->SaveDialog1->FileName);
   //存储文件
   }
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
if (Form1->Memo1->Modified)
   //判断文件是否被改变
   {
   if (MessageDlg("文件已经被修改过，存储修改后的结果吗？", mtConfirmation, TMsgDlgButtons() << mbYes << mbNo, 0) == mrYes)
       //提示用户是否保存修改结果
       {
       if (Form1->SaveDialog1->Execute())
          //显示对话框
          {
          Form1->Memo1->Lines->SaveToFile(Form1->SaveDialog1->FileName);
          //存储文件
          }
       }
   }
}
//---------------------------------------------------------------------------