从Inno Setup中的key = value文本文件(不带部分)获取值?

时间:2018-06-15 20:59:59

标签: inno-setup pascalscript

我想从文本文件(数据库名称,用户名,密码)中获取一些值,我找到了一种方法,但不确定是否是最好的方法,导致密码返回某种“制表符空格” “最后,这是正确的方法,还是有另一种方法可以更容易地做到这一点?

这是我的文字档案:

javax.persistence.jdbc.url=jdbc:mysql://address=(protocol=tcp)(host=127.0.0.1) 
(port=3306)/A_DBNAME
javax.persistence.jdbc.user=A_USER
javax.persistence.jdbc.password=A_PASSWORD

这是我的代码:

function StrSplit(Text: String; Separator: String): TArrayOfString;
var
  i, p: Integer;
  Dest: TArrayOfString; 
begin
  i := 0;
  repeat
    SetArrayLength(Dest, i+1);
    p := Pos(Separator,Text);
    if p > 0 then begin
      Dest[i] := Copy(Text, 1, p-1);
      Text := Copy(Text, p + Length(Separator), Length(Text));
      i := i + 1;
    end else begin
      Dest[i] := Text;
      Text := '';
    end;
  until Length(Text)=0;
  Result := Dest
end;

procedure InitializeWizard;
var
 file : AnsiString;
 dbName, pass, user : TArrayOfString;
begin
  LoadStringFromFile( ExpandConstant('{src}\jdbcfile.txt'), file);  
  user := StrSplit(file, 'javax.persistence.jdbc.user=');
  user := StrSplit(user[1],'javax.persistence.jdbc.password=')         
  MsgBox('User: '+user[0],mbInformation,MB_OK);
  pass := StrSplit(file,'javax.persistence.jdbc.password=');  
  MsgBox('Pass: '+pass[1],mbInformation,MB_OK);
  dbName := StrSplit(file, ')/');
  dbName := StrSplit(dbName[1],'javax.persistence.jdbc.user=');
  MsgBox('dbName: '+dbName[0],mbInformation,MB_OK);
end;

1 个答案:

答案 0 :(得分:1)

Imo,尝试同时解析整个文件结构(key=value)和单个键值(.url)在概念上是错误的。此外,您依赖于文件中的特定键顺序,这也是错误的。

  • 首先创建一个检索特定密钥值的函数。
  • 仅在此之后,解析特定键的值。由于.url键具有类似路径的结构,因此您可以“滥用”ExtractFileName function
function GetKeyValue(Lines: TStrings; Key: string): string;
var
  I, P: Integer;
begin
  for I := 0 to Lines.Count - 1 do
  begin
    P := Pos('=', Lines[I]);
    if (P > 0) and (CompareText(Trim(Copy(Lines[I], 1, P - 1)), Key) = 0) then
    begin
      Result := Trim(Copy(Lines[I], P + 1, Length(Lines[I]) - P));
      Exit;
    end;
  end;
  { Implicitly returns an empty string, if the key does not exist. }
  { Alternatively you can also throw an exception by using RaiseException function, }
  { or return some default value [by adding an additional parameter to this function]. }
end;
procedure InitializeWizard;
var
  Lines: TStringList;
  DbName, User, Password: string;
begin
  Lines := TStringList.Create;
  Lines.LoadFromFile(ExpandConstant('{src}\jdbcfile.txt'));

  DbName := ExtractFileName(GetKeyValue(Lines, 'javax.persistence.jdbc.url'));
  User := GetKeyValue(Lines, 'javax.persistence.jdbc.user');
  Password := GetKeyValue(Lines, 'javax.persistence.jdbc.password');

  Lines.Free;
  { ... }
end;