◆delphi调用webservice 问题◆

[df978]

webservice用的是c#（Vs2005）的代码：

using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Data;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
{
    public Service() 
    {
        //如果使用设计的组件，请取消注释以下行 
        //InitializeComponent(); 
    }

    [WebMethod]
    public int Sub(int a, int b)//两个整数相减
    {
     return a - b;
    }
}

下面是自动生成的service.pas:

// ************************************************************************ //
// The types declared in this file were generated from data read from the
// WSDL File described below:
// WSDL     : http://10.18.1.27/webService/Service.asmx?WSDL
// Encoding : utf-8
// Version  : 1.0
// (2009-05-04 13:23:01 - $Revision:   1.9.1.0.1.0.1.9  $)
// ************************************************************************ //

unit Service;

interface

uses InvokeRegistry, Types, XSBuiltIns;

type

  // ************************************************************************ //
  // The following types, referred to in the WSDL document are not being represented
  // in this file. They are either aliases[@] of other types represented or were referred
  // to but never[!] declared in the document. The types from the latter category
  // typically map to predefined/known XML or Borland types; however, they could also 
  // indicate incorrect WSDL documents that failed to declare or import a schema type.
  // ************************************************************************ //
  // !:int             - "http://www.w3.org/2001/XMLSchema"


  // ************************************************************************ //
  // Namespace : http://tempuri.org/
  // soapAction: http://tempuri.org/Sub
  // transport : http://schemas.xmlsoap.org/soap/http
  // binding   : ServiceSoap
  // service   : Service
  // port      : ServiceSoap
  // URL       : http://10.18.1.27/webService/Service.asmx
  // ************************************************************************ //
  ServiceSoap = interface(IInvokable)
  ['{77573149-9C57-FA51-F11F-EFD527C91BD9}']
    function  Sub(const a: Integer; const b: Integer): Integer; stdcall;
  end;

function GetServiceSoap(UseWSDL: Boolean=System.False; Addr: string=''): ServiceSoap;


implementation
  uses SOAPHTTPClient;

function GetServiceSoap(UseWSDL: Boolean; Addr: string): ServiceSoap;
const
  defWSDL = 'http://10.18.1.27/webService/Service.asmx?WSDL';
  defURL  = 'http://10.18.1.27/webService/Service.asmx';
  defSvc  = 'Service';
  defPrt  = 'ServiceSoap';
var
  RIO: THTTPRIO;
begin
  Result := nil;
  if (Addr = '') then
  begin
    if UseWSDL then
      Addr := defWSDL
    else
      Addr := defURL;
  end;
  RIO := THTTPRIO.Create(nil);
  try
     if UseWSDL then
    begin
      RIO.WSDLLocation := Addr;
      RIO.Service := defSvc;
      RIO.Port := defPrt;
    end else
      RIO.URL := Addr;
    Result := (RIO as ServiceSoap);
  finally
    if Result = nil then
      RIO.Free;
  end;
end;


initialization
  InvRegistry.RegisterInterface(TypeInfo(ServiceSoap), 'http://tempuri.org/', 'utf-8');
  InvRegistry.RegisterDefaultSOAPAction(TypeInfo(ServiceSoap), 'http://tempuri.org/Sub');

end. 

调用web服务的代码：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,StdCtrls, DB, ADODB,InvokeRegistry, Rio, SOAPHTTPClient ;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses Service;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  rtn: Integer;
  ws: ServiceSoap;
begin
  ws:= GetServiceSoap(false,'');
  rtn:= ws.Sub(13,5);//计算13减去5的结果
  showmessage('返回结果: '+ intToStr(rtn));
end;

end.

比较费解的是返回的结果一直“0”，但用C#调用时没有问题的
请高手帮忙，问题出在哪里？

[df978]

我试了一下，如果在web service加入如下函数的话，用delphi调用是可以得到"Hello World"，但就是不能得到Sub的计算结果：
[WebMethod]
public string HelloWorld()
{
return "Hello World";
}

[df978]

我用的是delphi 6

[haisha]

在service单元的“initialization”加入：
InvRegistry.RegisterInvokeOptions(TypeInfo(ServiceSoap), ioDocument);

[liangpei2008]

InvRegistry.RegisterInvokeOptions(TypeInfo(ServiceSoap), ioDocument);