Delphi读取文件和写入文件总结

Allen 2009-06-15 14:41:40 12944 16 0 0 0

Delphi读取文件和写入文件总结
---
读取文件：
1，关联文件：AssignFile(pMyFile,^c: tt.csv^);
2，打开文件：Reset(pMyFile);
3，读取一行：Readln(pMyFile,pStr);
4，关闭文件：CloseFile(pMyFile);

示例：

procedure TForm1.Button1Click(Sender: TObject);
var
pMyFile:textfile;
pStr : string;
begin
    if OpenDialog1.Execute then begin
        Assignfile(pMyFile,OpenDialog1.FileName);
        Reset(pMyFile);
        while not Eof(pMyFile) do begin
            Readln(pMyFile,pStr);
            //fn_DelStock(pStr); //使用读取的字符串相关语句
            next;
        end;
        CloseFile(pMyFile);
    end;
end;

+++
写入文件：
1，关联文件：AssignFile(pMyFile,^c: tt.csv^);
2，打开文件：ReWrite(pMyFile); //如果文件不存在,用ReWrite打开
Append(pMyFile); //如果文件已经存在,追加内容，用Append打开
3，写入一行：WriteLn(pMyFile,pStr);
4，关闭文件：CloseFile(pMyFile);

示例一：

procedure TForm1.Button1Click(Sender: TObject);
var
  i:integer ;
  pMyFile: textfile;
begin
   system.AssignFile(pMyFile,^d: est.txt^);
   rewrite(pMyFile);
   {closefile(pMyFile);　　

   system.AssignFile(pMyFile,^d: est.txt^);
   append(pMyFile); // 此部分可有可无 }
   for i:=1 to 100 do begin
   writeln(pMyFile,intTostr(i)+^ X ^+intTostr(i)+^ = ^+intTostr(i*i));
   end ;
   closefile(pMyFile);

   showmessage(^写入文件完成！^);
end;

示例二：

procedure TForm1.WLog(pMsg: string);
var
  pFObJect,pFPath,pFName: string;
  pMyFile: textFile;
  pStr: string;
begin

   pFPath:=^d:^;
   pFName:=^StockDel_^+formatDateTime(^yyyymmddhhmmss^,now);
   pFObject:=pFPath + ^^ + pFName + ^.csv^;
   try
   AssignFile(pMyFile,pFObject);
   if FileExists(pFObject)=false then
   ReWrite(pMyFile)
   else
   Append(pMyFile);
   pStr:=pMsg;
   WriteLn(pMyFile,pStr);
   finally
   CloseFile(pMyFile);
   end;

end;

+++
公用写日志文件过程

//==ini文件设置：
^日志选项和文件当Log_Flag=N时不记录，否则均记录
Log_Flag=1
Log_PathFileName=\10.105.10.12cPrd_220_Filelog.dat

//==声明全局变量
x_pLogFile: string; //日志文件名称
x_pLogFlag: string; //是否记录日志，N：不写日志
x_pFindLogFile: boolean; //记录日志文件是否存在，避免每次写日志时都要判断。

//==过程声明
procedure cpWriteLog(pFObject:string; pTxt:string; pMode:byte);

//==初始化全局变量
procedure TForm1.FormCreate(Sender: TObject);
begin
x_pLogFile:= cfReadIniFile(X_cProgID,^Log_PathFileName^,^c:ENRC0300_Log.txt^);
x_pLogFlag:= cfReadIniFile(X_cProgID,^Log_Flag^,^N^);
end;

//==写日志过程
procedure cpWriteLog(pFObject:string; pTxt:string; pMode:byte);
var
pMyFile: textFile;
begin
    if x_pLogFlag=^N^ then exit;
    try
        AssignFile(pMyFile,pFObject);
        if pMode=1 then pTxt:= DateTimeToStr(Now)+^ ^+pTxt;
        if x_pFindLogFile=True then
            append(pMyFile)
        else begin
            if FileExists(pFObject) then
                append(pMyFile)
            else
                reWrite(pMyFile);
            x_pFindLogFile:=true;
        end;
        WriteLn(pMyFile,pTxt);
    finally
        CloseFile(pMyFile);
    end;
end;