電腦五國語言程式基本輸入功能: 逐行讀檔 - 夏肇毅部落格

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電腦五國語言程式基本輸入功能: 逐行讀檔

2011/04/13 21:30:44瀏覽733｜回應0｜推薦0

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;
}
}

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