基本程式輸入包含File, URL, Socket, Message Bus,Queue, DB Table 等:
Input:
-ReadFile
-GetFileFromURL
-ReadSocket
-ReadMessageBus
-ReadQueue
-ReadDBTable

讀檔細步分解如下:
InputActions:
ReadFile 讀檔
  OpenFile 開檔
  ReadWholeFile 讀全檔
或
ReadLineByLine 逐行讀
  LoopNOTEOF 非檔案結束時迴圈
   ReadALine 讀一行
  EndLoop 結束迴圈
CloseFile 關檔

下面是各種語言(VB5,C,JAVA,PHP,C#.NET)之逐行讀檔範例
整個寫法是以VB6為基準 其他語言也做相對的片段對應方式編寫
並不是該語言的標準寫法
這點需要特別注意


VB6:
' *******************************************
' File Functions
' *******************************************
Function EndOfFile() as Boolean
  EndOfFile=EOF(1)
End Function

Function ReadHandle() as Boolean
  ReadHandle=Not EOF(1)
End Function

Sub FileFunction()
  Dim i as Integer
  Dim ss as String
  ' Read File
  Open "C:\\test.txt" For Input As #1
  ' check open file result
  If ReadHandle() Then
   While (NOT EndOfFile())
    Line Input #1, ss
    Debug.Print " ";ss;
    Debug.Print
   WEnd
   Close #1
  End If
End Sub



C:
/* ******************************************* */
/* File Functions */
/* ******************************************* */
FILE *finput;
FILE *foutput;
FILE *frandom;
int fhinput;
int fhoutput;

bool EndOfFile() {
  return feof(finput);
}
bool ReadHandle() {
  if (finput!=0)
   return 1;
  else
   return 0;
}
void FileFunction() {
  int i;
  char ss[100];
  /* Read File */
  finput=fopen("C:\\test.txt", "r+b");
  /* check open file result */
  if (ReadHandle()) {
   while ( ! EndOfFile()) {
     fscanf(finput, "%[^\n]", ss);
     fgetc(finput);  / skip crlf
     printf(" %s" , ss);
     printf("\n" );
   }
   fclose(finput);
  }
  vfree((char*)ss);
}

JAVA:
// *******************************************
// File Functions
// *******************************************
BufferedReader input = null;
BufferedWriter output = null;
FileInputStream in = null;
FileOutputStream out = null;
File randomfile = null;
String line="";
char [] charbuf = null;

public boolean EndOfFile() {
  if (line==null) {
   return true;
  } else {
   return false;
  }
}

public boolean ReadHandle() {
  if (input!=null) {
   return true;
  } else {
   return false;
  }
}

public void FileFunction() {
int i;
String ss = null;

// Read File
try {
  input = new BufferedReader( new FileReader(new File("C:\\test.txt")) );
  line = "";
 } catch(Exception e) { input = null; System.err.println(e.getMessage()); }
  // check open file result
  if (ReadHandle()) {
  while ( ! EndOfFile()) {
   try {
    line = input.readLine();
    ss = line;
   } catch(Exception e) { System.err.println(e.getMessage());
  }
   System.out.print(" "+ss );
   System.out.println("");
  }
  try {
  if (input!=null) { input.close(); input=null; System.gc(); };
  } catch(Exception e) { System.err.println(e.getMessage()); }
 }
}

PHP:
/* ******************************************* */
/* File Functions */
/* ******************************************* */
function EndOfFile() {
  global $hinput;
  return feof($hinput);
}

function ReadHandle() {
  global $hinput;
  if ($hinput==null)
   return false;
  else
   return true;
  }

function FileFunction() {
  /* Read File */
  $hinput = fopen("C:\\test.txt", "r+b");
  /* check open file result */
  if (ReadHandle()) {
   while ( ! EndOfFile()) {
    $ss = fgets($hinput);
    echo " ".$ss;
    echo "";
   }
  fclose($hinput);
  }
}

C#.NET:
/* ******************************************* */
/* File Functions */
/* ******************************************* */
StreamWriter sw;
StreamReader sr;
FileStream fsw;
FileStream fsr;

bool EndOfFile() {
  return sr.EndOfStream;
}

bool ReadHandle() {
  if (sr!=null) {
   return true;
  }
  else
  {
   return false;
  }
}

public void FileFunction() {
  int i;
  String ss = null;
  /* Read File */
  try { sr = new StreamReader("C:\\test.txt", Encoding.GetEncoding("big5"));}
  catch { sr = null; }
  /* check open file result */
  if (ReadHandle()) {
   while ( ! EndOfFile()) {
    ss = sr.ReadLine();
    Console.Write(" "+ss);
    Console.WriteLine("");
   }
   sr.Close();
   sr = null;
  }
}