FileStream 类实现日志

FileStream 类实现日志

FileStream类几乎可以处理所有的文件操作.

以下为一个日志类,除了配置不太灵活外,挺好用的.

type
  TBuffer = array [0..2000] of char;
 
  TGameLogFile = class
  private
    FFullPath:string;//完整路径,用这个路径来判断当前的打开的日志的大小.
    FileDate:TDateTime;
    FFileParth: string; //路径
    FText: Text;
    FLogFileStream:TFileStream;
    FIsCreateToNew: boolean; //是否是每次启动程序都创建新的记录文件 否则就是当天只会有1个文件
    FIsControlFileSize:Boolean;//是否控制文件大小,true,超出文件大小时,重新创建一个log文件
  public
    {带入日志文件存放的目录位置}
    constructor Create(Iparth: string);
    destructor Destroy; override;
    {写入内容即可自动记录}
    procedure init(Iparth: string);
    procedure AddLog(Icon: string; const LogLevel: Integer = 0);
    property IsCreateToNew: boolean read FIsCreateToNew write FIsCreateToNew;
  end;

implementation
uses StdCtrls;
const
  {分割符号}
  CSplitStr = '===============================================================';
  ClogFileName = '.log';
{ TGameLogFile }

procedure TGameLogFile.AddLog(Icon: string; const LogLevel: integer = 0);
var
  txt:string;
  buffer:TBuffer; //开一个2K的缓存
begin
  try
    if FIsCreateToNew then
      if Date - FileDate >= 1 then    //超过一天.强制换掉日志文件
      begin
        CloseFile(FText);
        init(FFileParth);
      end;

    if FIsControlFileSize then
    begin
      if FLogFileStream.Size > 3 * 1000 * 1000 then    //这里的单位是M,有时间改成可配置
        init(FFileParth); //重新切换一个日志
    end;
    
    StrCopy(buffer,PChar(Icon));
    FLogFileStream.Write(buffer,Length(Icon));//如果直接write(Icon,Length(Icon)),会产生乱码.
  except
    IOResult;
  end;
end;

constructor TGameLogFile.Create(Iparth: string);
begin
  FIsCreateToNew := false;
  FIsControlFileSize := not (FIsCreateToNew xor False);  //当FIsCreateToNew为true时,此变量为假
  FFileParth := Iparth;
  init(FFileParth);
end;

//在这里创建一个日志文件
procedure TGameLogFile.init(Iparth: string);
var
  Ltep: string;
begin
 if not DirectoryExists(FFileParth) then
    if not CreateDir(FFileParth) then begin
      raise Exception.Create('错误的路径，日志类对象不能被创建');
      exit;
    end;
  if FIsCreateToNew then begin
    Ltep := FormatDateTime('yyyymmddhhnnss', Now);
    FileClose(FileCreate(FFileParth + ltep + ClogFileName));
  end
  else
    Ltep := FormatDateTime('yyyymmddhhnnss', Now);
  if not FileExists(FFileParth + ltep + ClogFileName) then
    FileClose(FileCreate(FFileParth + ltep + ClogFileName));
  FileDate := Date;
  FFullPath := FFileParth + ltep + ClogFileName;
  //此处改用TFileStream用来控制Log日志文件的大小  2011年8月24日9:28:25 ddz
  //AssignFile(FText, FFileParth + ltep + ClogFileName);
  if Assigned(FLogFileStream) then
     FLogFileStream.Free;
  //新建日志文件.
  FLogFileStream := TFileStream.Create(FFullPath,fmCreate    or fmShareDenyNone);
  FLogFileStream.free;
  //读写日志文件
  FLogFileStream := TFileStream.Create(FFullPath,fmOpenReadWrite    or fmShareDenyNone);
end;

destructor TGameLogFile.Destroy;
begin
  try
    if Assigned(FLogFileStream) then
      FreeAndNil(FLogFileStream);
  except
  end;
  inherited;
end;
end.