type
myrec = record
id:dWord;
name:array[0..31] of WideChar;
three:dword;
count:dword;
ShuXing:Single;
ShuXing2:dword;
ShuXing3:dWORD;
end;
var
Form1: TForm1;
mystr:TMemoryStream;
nowmyrec:myrec;
implementation
USES Rtti;
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
var
rttiContext: TRttiContext;
rttiType: TRttiType;
fields: TArray<TRttiField>;
item: myrec;
i:word;
begin
mystr:=TMemoryStream.Create;
mystr.LoadFromFile(ExtractFilePath(Application.exename)+'1.data');
mystr.Position:=20;
mystr.readbuffer(nowmyRec,88);
rttiType := rttiContext.GetType(TypeInfo(myRec));
fields := rttiType.GetFields;
for i := low(fields) to high(fields) do
begin
Memo1.Lines.Add(fields[i].GetValue(@nowmyRec).ToString );
end;
end;
end.
myrec.name是中文字符,myrec.name的长度是64个字节,我无法读取myrec.name来作为备忘,请帮帮我!!!
最佳答案
我在Delphi 2010上,发现您的代码有几个问题。首先,我无法让RTTI方法与字符数组的内联声明一起使用。我将其更改为:
type
TCharArray = array[0..31] of WideChar;
TRec = record
id:dWord;
name:TCharArray;
end;
如果以内联方式声明数组,则调用
GetValue
将引发AV。这可能已在XE中修复,或者很可能是我错误地使用了RTTI。其次,您需要对数组进行特殊处理,而不是标量值:
procedure Main;
var
i, j: Integer;
rec: TRec;
rttiContext: TRttiContext;
rttiType: TRttiType;
fields: TArray<TRttiField>;
val: TValue;
s: string;
begin
rec.id := 1;
rec.name := 'Hello Stack Overflow';
rttiType := rttiContext.GetType(TypeInfo(TRec));
fields := rttiType.GetFields;
for i := low(fields) to high(fields) do begin
val := fields[i].GetValue(@rec);
if val.IsArray then begin
s := '';
for j := 0 to val.GetArrayLength-1 do begin
s := s+val.GetArrayElement(j).ToString;
end;
Writeln(s);
end else begin
Writeln(val.ToString);
end;
end;
end;
输出:
1
Hello Stack Overflow
这显然不是生产代码,但至少应该使您重回正轨!
附言这是我第一次查看新的RTTI功能。看起来很漂亮!
关于delphi - rtti的遍历记录,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/5202489/