使用RTTI访问记录的所有元素 [英] access all elements of a record using RTTI
本文介绍了使用RTTI访问记录的所有元素的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
TmyRecord =
aValue:我想将一个复杂/长的记录转储到一个备忘录中进行调试String
aNumber:Real;
Morenumbers:整数;
....
....
end;
我认为Delphi XE 2 RTTI应该让我有机会获得Fieldname,Fieldtype和value
在循环中,将此记录写入备忘录或.....
解决方案
作为起点 - 记录与简单的类型。对于复杂的字段(数组,类等)探索RTTI单元
键入
TmyRecord = record
aValue:串;
aNumber:Real;
Morenumbers:整数;
结束
var
m:TMyRecord;
rtype:TRTTIType;
字段:TArray< TRttiField> ;;
i:整数;
begin
m.aValue:='OK';
m.aNumber:= Pi;
m.Morenumbers:= 666;
rtype:= TRTTIContext.Create.GetType(TypeInfo(TMyrecord));
Memo1.Lines.Add(rtype.ToString);
fields:= rtype.GetFields;
for i:= 0 to High(fields)do
Memo1.Lines.Add(Format('%s:%s ::%s',[
fields [i] .Name ,
fields [i] .FieldType.ToString,
fields [i] .GetValue(@m).ToString]));
输出:
code> TmyRecord
aValue:string :: OK
aNumber:Real :: 3.14159265358979
Morenumbers:Integer :: 666
I want to dump a complex / long record into a memo for debugging purpose
TmyRecord =
aValue : String
aNumber : Real;
Morenumbers : Integer ;
....
....
end;
I think Delphi XE 2 RTTI should give me the chance to get the Fieldname , Fieldtype and value within a loop, to write this record to a memo or .....
解决方案
As starting point - record with simple types. For complex fields (array, class etc) explore RTTI unit
type
TmyRecord = record
aValue: String;
aNumber: Real;
Morenumbers: Integer;
end;
var
m: TMyRecord;
rtype: TRTTIType;
fields: TArray<TRttiField>;
i: Integer;
begin
m.aValue := 'OK';
m.aNumber := Pi;
m.Morenumbers := 666;
rtype := TRTTIContext.Create.GetType(TypeInfo(TMyrecord));
Memo1.Lines.Add(rtype.ToString);
fields := rtype.GetFields;
for i := 0 to High(fields) do
Memo1.Lines.Add(Format('%s: %s :: %s', [
fields[i].Name,
fields[i].FieldType.ToString,
fields[i].GetValue(@m).ToString]));
output:
TmyRecord
aValue: string :: OK
aNumber: Real :: 3.14159265358979
Morenumbers: Integer :: 666
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