indy10的idhttpServer应答字符串

Posted 2021-02-03 hnxxcxg

indy10的idhttpServer应答字符串

先看应答字符串的代码：

procedure TIdIOHandler.Write(const AOut: string; AByteEncoding: IIdTextEncoding = nil
  {$IFDEF STRING_IS_ANSI}; ASrcEncoding: IIdTextEncoding = nil{$ENDIF}
  );
begin
  if AOut <> ‘‘ then begin
    AByteEncoding := iif(AByteEncoding, FDefStringEncoding);
    {$IFDEF STRING_IS_ANSI}
    ASrcEncoding := iif(ASrcEncoding, FDefAnsiEncoding, encOSDefault);
    {$ENDIF}
    Write(
      ToBytes(AOut, -1, 1, AByteEncoding
        {$IFDEF STRING_IS_ANSI}, ASrcEncoding{$ENDIF}
        )
      );
  end;
end;

　　从代码可以看出，发送字符串，最终是将字符串转为TidBytes，发送的。

再跟一下发送TidBytes的代码：

procedure TIdIOHandler.Write(const ABuffer: TIdBytes; const ALength: Integer = -1;
  const AOffset: Integer = 0);
var
  LLength: Integer;
begin
  LLength := IndyLength(ABuffer, ALength, AOffset);
  if LLength > 0 then begin
    if FWriteBuffer = nil then begin
      WriteDirect(ABuffer, LLength, AOffset);
    end else begin
      // Write Buffering is enabled
      FWriteBuffer.Write(ABuffer, LLength, AOffset);
      if (FWriteBuffer.Size >= WriteBufferThreshold) and (WriteBufferThreshold > 0) then begin
        repeat
          WriteBufferFlush(WriteBufferThreshold);
        until FWriteBuffer.Size < WriteBufferThreshold;
      end;
    end;
  end;
end;

　　大的BUF，会分成N次陆续发送。所以INDY发送大字符串无须担心什么。