如何在Inno Setup中解析JSON字符串? [英] How to parse a JSON string in Inno Setup?

问题描述

我有以下JSON:

{"key1": "value1", "key2": 2}

不幸的是， TLama的Inno JSON配置库不适用于JSON字符串，而只能用于与json文件.

Unfortunately TLama's Inno JSON Config library doesn't work with JSON strings but only with json files.

我尝试使用JSON字符串而不是json文件的路径，但是它不起作用.

I tried to use JSON string instead of path to json file, but it didn't work.

if JSONQueryInteger('{"Info":{"User":2}}', 'Info', 'User', 0, IntValue) then
    MsgBox('User=' + IntToStr(IntValue), mbInformation, MB_OK);  

我知道我可以将JSON保存到文件中，然后解析它，但看起来有些混乱.

I know I could save my JSON to a file and then parse it but it seems kind of messy.

如何在Inno Setup中解析JSON字符串?

How to parse a JSON string in Inno Setup?

推荐答案

您可以使用 JsonParser库反而.它可以解析JSON字符串.

You can use JsonParser library instead. It can parse JSON strings.

它不像JSONConfig.dll那样容易使用.但另一方面，它是本机的Pascal脚本代码.因此，它不仅可以从临时.json文件中保存您，还可以从临时.dll文件中保存您.

It's not as easy to use as JSONConfig.dll. But on the other hand, it's a native Pascal Script code. So, it not only saves you from a temporary .json file, but also from a temporary .dll.

代码可以像这样:

[Code]

#include "JsonParser.pas"

function GetJsonRoot(Output: TJsonParserOutput): TJsonObject;
begin
  Result := Output.Objects[0];
end;

function FindJsonValue(
  Output: TJsonParserOutput; Parent: TJsonObject; Key: TJsonString;
  var Value: TJsonValue): Boolean;
var
  I: Integer;
begin
  for I := 0 to Length(Parent) - 1 do
  begin
    if Parent[I].Key = Key then
    begin
      Value := Parent[I].Value;
      Result := True;
      Exit;
    end;
  end;

  Result := False;
end;

function FindJsonObject(
  Output: TJsonParserOutput; Parent: TJsonObject; Key: TJsonString;
  var Object: TJsonObject): Boolean;
var
  JsonValue: TJsonValue;
begin
  Result :=
    FindJsonValue(Output, Parent, Key, JsonValue) and
    (JsonValue.Kind = JVKObject);

  if Result then
  begin
    Object := Output.Objects[JsonValue.Index];
  end;
end;

function FindJsonNumber(
  Output: TJsonParserOutput; Parent: TJsonObject; Key: TJsonString;
  var Number: TJsonNumber): Boolean;
var
  JsonValue: TJsonValue;
begin
  Result :=
    FindJsonValue(Output, Parent, Key, JsonValue) and
    (JsonValue.Kind = JVKNumber);

  if Result then
  begin
    Number := Output.Numbers[JsonValue.Index];
  end;
end;

function FindJsonString(
  Output: TJsonParserOutput; Parent: TJsonObject; Key: TJsonString;
  var Str: TJsonString): Boolean;
var
  JsonValue: TJsonValue;
begin
  Result :=
    FindJsonValue(Output, Parent, Key, JsonValue) and
    (JsonValue.Kind = JVKString);
  if Result then
  begin
    Str := Output.Strings[JsonValue.Index];
  end;
end;

function ParseJsonAndLogErrors(
  var JsonParser: TJsonParser; const Source: WideString): Boolean;
var
  I: Integer;
begin
  ParseJson(JsonParser, Source);

  Result := (Length(JsonParser.Output.Errors) = 0);
  if not Result then
  begin
    Log('Error parsing JSON');
    for I := 0 to Length(JsonParser.Output.Errors) - 1 do
    begin
      Log(JsonParser.Output.Errors[I]);
    end;
  end;
end;

procedure ParseJsonString;
var
  Json: string;
  JsonParser: TJsonParser;
  I: Integer;
  JsonRoot, InfoObject: TJsonObject;
  UserNumber: TJsonNumber; { = Double }
  UserString: TJsonString; { = WideString = string }
begin
  Json := '{"Info":{"User":2,"String":"abc"}}';

  if ParseJsonAndLogErrors(JsonParser, Json) then
  begin
    JsonRoot := GetJsonRoot(JsonParser.Output);
    if FindJsonObject(JsonParser.Output, JsonRoot, 'Info', InfoObject) and
       FindJsonNumber(JsonParser.Output, InfoObject, 'User', UserNumber) and
       FindJsonString(JsonParser.Output, InfoObject, 'String', UserString) then
    begin
      Log(Format('Info:User:%d', [Round(UserNumber)]));
      Log(Format('Info:String:%s', [UserString]));
    end;
  end;

  ClearJsonParser(JsonParser);
end;

---

另一个选择是派生Inno JSON Config库并添加对字符串解析的支持.

---

Another option is to fork the Inno JSON Config library and add support for parsing strings.

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