Question

我试图在记录它之后获取变量的总和。您可以在下面的代码中指导我吗？

data_size['Deal Size / Complexity Measure2']=pd.DataFrame.sum(math.log(data_size['Deal Size'])+data_size['Deal Complexity'])/100

我不确定我是否输入正确，因为我试图将Excel代码转换为Python - 下面是我试图转换的excel代码。 = SUM（LOG（D2）+ E2）/ 100

Answer 1

试试这个：

{code in dll}
       function Test:pchar;
        var
          str:string;
        begin
           str:='Some string';
           result:=pchar(str); // wrong way, may be UB. 
        end;


        {code in dll}

        var
          str:string // global variable

        function Test:pchar;
        begin
          str:='Some string';
          result:=pchar(str); // code not threadsafe
        end;

        {code in dll}
        function Test:WideString;
        var
          str:WideString;
        begin
           str:='Some string';
           result:=str; // will works ONLY with Delphi apps :( 
        end;

:(

how do experienced programmers?



var
  Form1: TForm1;
  function Test(out p:pchar):Integer;stdcall; external 'project2';
  procedure FinalizeStr(P:Pointer);stdcall; external 'project2';

implementation

{$R *.dfm}

function StrFromDll:string;
var
  p:pchar;
begin
  try
    setstring(result,P, test(p));
  finally
    finalizestr(cardinal(p));
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  showmessage(strfromdll);
end;


{code in dll}


library Project2;

uses
  fastmm4,fastmm4messages,
  SysUtils,
  Classes;

{$R *.res}

function Test(out p:pchar):Integer;stdcall;
var
  str:string;
  len:integer;
begin
  str:='Hello, i am a string from the dll?!#@%!?'+inttostr(hinstance);  // only for example
  len:=length(str);
  p:=allocmem(len+1);
  StrPLCopy(P,str,len);
  result:=len;
end;

procedure FinalizeStr(P:Pointer);stdcall;
begin
  FreeMem(P);
end;

exports Test,FinalizeStr;
end.

TypeError：无法将系列转换为<type'float'=“”>（需要记录日志）

1 个答案: