是否有类似 StrToCurr 的函数可以处理千位分隔符?

Is there a StrToCurr like function that can deal with thousand separators?

我有一个类似的案例as in this question

procedure TForm2.FormCreate(Sender: TObject);
var
  S: string;
  C: Currency;
  FormatSettings: TFormatSettings;
begin
  S := '1.000.000,00';
  FormatSettings := TFormatSettings.Create;
  FormatSettings.ThousandSeparator := '.';
  FormatSettings.DecimalSeparator := ',';
  // raises an Exception which is "as designed" as per the documentation
  C := StrToCurr(S, FormatSettings);
  ShowMessage(FormatCurr(',0.00', C));
end;

引用大卫的话:

So it is a mistake to pass a string containing a thousands separator to this function.

那么 Delphi 是否有任何内置函数可以解析包含千位分隔符的货币字符串?

这个设计(缺陷)的解决方案很简单:定义你自己的函数。

unit MyFixForSysUtils;

interface

function StrToCurr(const Str: string): Currency; overload;
function StrToCurr(Str: string; const FormatSettings : TFormatSettings): Currency; overload;  

implementation

uses SysUtils;

function StrToCurr(Str: string; const FormatSettings : TFormatSettings): Currency;
begin
  Str:= StringReplace(Str, FormatSettings.ThousandSeparator, '', [rfReplaceAll]);
  Result:= SysUtils.StrToCurr(Str, FormatSettings);
end;

 function StrToCurr(const Str: string): Currency;
 begin
   Result:= StrToCurr(Str, FormatSettings);
 end;

如果您确定自己的版本在范围上比 sysutils 更接近,那么您不需要更改代码:

uses
  SysUtils,
  MyFixForSysUtils,  <-- contains the above function
  .... other units.

现在 Delphi 将 select 固定功能而不是损坏的功能。

有关此概念的更多信息,请参阅:Delphi interposer

您可以在'activex.pas'中使用从'oleaut32'导入的VarCyFromStr from 'varutils.pas' which by default points to the COM helper VarCyFromStr(您可以直接使用)。

如果您知道字符串是使用系统默认语言环境本地化的,您可以使用:

var
  S: string;
  C: Currency;
begin
  S := '1.000.000,00';
  if varutils.VarCyFromStr(S, 0, LOCALE_NOUSEROVERRIDE, C) = VAR_OK then
    ShowMessage(FormatCurr(',0.00', C))
  else

或为 LCID 传递 GetThreadLocale 以使用当前线程的设置。

如果字符串是使用默认用户区域设置本地化的,您可以让 RTL 为您调用它,它使用此函数进行变体转换。

var
  V: Variant;
  C: Currency;
begin
  V := '1.000.000,00';
  C := V;
  ShowMessage(FormatCurr(',0.00', C));

否则您必须知道该字符串在哪个语言环境中代表一种货币。示例:

var
  S: string;
  C: Currency;
begin
  S := '1,000,000.00';
  if varutils.VarCyFromStr(S, MAKELCID(LANG_ENGLISH, SORT_DEFAULT), 0, C) = VAR_OK then
    ShowMessage(FormatCurr(',0.00', C))
  else
    // handle error