[BCB(C++ Builder)/C/C++] 檔案 讀取

資料來源: https://sites.google.com/site/sjdsalg/materials/program/readwritefiles

code [Read]

#include "stdio.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
int maze [20][20];
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  FILE *fp;
  AnsiString out;
  int m, n, i, j;
  if (OpenDialog1->Execute())
  {  fp = fopen(OpenDialog1->FileName.c_str(), "r+");  
     //c_str函数的傳回值是 const char *, 即把string轉成const char *
          fscanf(fp, "%d %d", &m, &n);    // Reda in two integers m & n
     Memo1->Lines->Add("m="+IntToStr(m));
     Memo1->Lines->Add("n="+IntToStr(n));
     for (i=1; i<=m; i++)      // Reda in m*n 0/1's into maze[][]
         for (j=1; j<=n; j++)
             fscanf(fp, "%d", &maze[i][j]);
     for (i=1; i<=m; i++)      // Print out maze[][] in Memo1
     {   out = "";
         for (j=1; j<=n; j++)
             out += "  "+IntToStr(maze[i][j]);
         Memo1->Lines->Add(out);
     }            
     // Print out maze[][] in StringGrid1
     StringGrid1->RowCount = m+1;
     StringGrid1->ColCount = n+1;
     for (i=1; i<=m; i++)
     {   for (j=1; j<=n; j++)
         {   StringGrid1->Cells[j][i] = maze[i][j];
         }
     }
     fclose(fp);
  }
  else  Memo1->Lines->Add("Nothing happens.");
 }