winhttp在DelphiXE10.2中的使用

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls,
  WinHttp_TLB, //需要引入
  ComObj;      //需要引入

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    Http: WinhttpRequest;
    function HPost(PostUrl, Post: string): WideString;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function TForm1.HPost(PostUrl, Post: string): WideString;
var
 // Stream: TMemoryStream;
  url, wStr: WideString;
begin
  try
    Url := PostUrl;
    Http.Open('POST', url, EmptyParam);
//    Http.SetRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    Http.SetRequestHeader('Content-Type', 'application/json');
    Http.Option[6] := false;
    Http.Send(OleVariant(Post));
   // stream := OleVariantToMemoryStream(http.ResponseBody);
   // Stream.Position := 0;
    wStr := Http.ResponseText;
   // stream.Free;
  except
   // Stream.Free;
    wStr := '';
  end;
  result := wStr;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Text := HPost('https://mail.qq.com/', 'Post');
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Http := CreateComObject(CLASS_WinHttpRequest) as WinHttpRequest;
  Http.SetTimeouts(10000, 10000, 5000, 5000);
end;

end.