Delphi7 客户端调用WebService（天气预报）

客户程序：
第一步：新建一个Application。

第二步：File----->New----->Other------>WebServices----->WSDL Importer

然后在Location of WSDL File or URL中填入：

http://10.22.30.61:36601/MonitorService.asmx?wsdl

或 http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl，然后确定即生成了一个新的接口定义单元。

第二步：在主form上放上一个按钮和一个Httprio组件（在WebServices页上），并引用第二个单元（即通过WSDL Importer自动生成的单元）

在Httprio的属性页上的WsdlLocation里面填上http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl；然后在Httprio属性页上的Port和Service上选择上相应的数据即可。

第三步：书写客户调用程序，原代码如下：

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
  TMP_Weather: ArrayOfString;
begin
  //http://developer.51cto.com/art/200908/147125.htm
  //http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl
  TMP_Weather := (HTTPRIO1 as WeatherWebServiceSoap).getWeatherbyCityName('53698'); //石家庄

  Memo1.Lines.Clear;
  for i := 0 to 22 do
  begin
    Memo1.Lines.Add(TMP_Weather[i]);
  end;
end;

---- 错误信息为：
Project Project1.exe raised exception class ERemotableException with message '服务器无法处理请求。 ---> 未将对象引用设置到对象的实例。'. Process stopped. Use Step or Run to continue.

------解决方案--------------------------------------------------------
修改一下WeatherWebService.pas这个单元，如下所示，一切就OK啦。

Delphi(Pascal) code

if HTTPRIO = nil then RIO := THTTPRIO.Create(nil) else RIO := HTTPRIO; RIO.HTTPWebNode.UseUTF8InHeader:= True; //这里加上这一句 try Result := (RIO as TestStationSoap); if UseWSDL then begin RIO.WSDLLocation := Addr; RIO.Service := defSvc; RIO.Port := defPrt; end else RIO.URL := Addr; finally if (Result = nil) and (HTTPRIO = nil) then RIO.Free; end; InvRegistry.RegisterInterface(TypeInfo(WeatherWebServiceSoap), 'http://WebXml.com.cn/', 'utf-8'); InvRegistry.RegisterDefaultSOAPAction(TypeInfo(WeatherWebServiceSoap), 'http://WebXml.com.cn/%operationName%'); RemClassRegistry.RegisterXSInfo(TypeInfo(ArrayOfString), 'http://WebXml.com.cn/', 'ArrayOfString'); RemClassRegistry.RegisterXSClass(getSupportDataSetResult, 'http://WebXml.com.cn/', 'getSupportDataSetResult'); InvRegistry.RegisterInvokeOptions(TypeInfo(WeatherWebServiceSoap), ioDocument);//这里加上这一句------解决方案--------------------------------------------------------补充一下，如果你用到HTTPRIO1去调webservice接口那就记得在前面加上这句HTTPRIO1.HTTPWebNode.UseUTF8InHeader:= True;//解决汉字乱码问题

本文出自：http://blog.csdn.net/gjtao1130/article/details/12193235 只是做部分修正。

//-------------以下是本人模仿的例子，窗体没有用到Httprio组件，通过GetWeatherWebServiceSoap函数处理即可。

  1 // ************************************************************************ //
  2 // The types declared in this file were generated from data read from the
  3 // WSDL File described below:
  4 // WSDL     : http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl
  5 // Encoding : utf-8
  6 // Version  : 1.0
  7 // (2014/12/10 11:28:28 - 1.33.2.5)
  8 // ************************************************************************ //
  9 
 10 unit WeatherWebService;
 11 
 12 interface
 13 
 14 uses InvokeRegistry, SOAPHTTPClient, Types, XSBuiltIns;
 15 
 16 type
 17 
 18   // ************************************************************************ //
 19   // The following types, referred to in the WSDL document are not being represented
 20   // in this file. They are either aliases[@] of other types represented or were referred
 21   // to but never[!] declared in the document. The types from the latter category
 22   // typically map to predefined/known XML or Borland types; however, they could also 
 23   // indicate incorrect WSDL documents that failed to declare or import a schema type.
 24   // ************************************************************************ //
 25   // !:string          - "http://www.w3.org/2001/XMLSchema"
 26 
 27   getSupportDataSetResult = class;              { "http://WebXml.com.cn/" }
 28 
 29   ArrayOfString = array of WideString;          { "http://WebXml.com.cn/" }
 30 
 31 
 32   // ************************************************************************ //
 33   // Namespace : http://WebXml.com.cn/
 34   // ************************************************************************ //
 35   getSupportDataSetResult = class(TRemotable)
 36   private
 37     Fschema: WideString;
 38   published
 39     property schema: WideString read Fschema write Fschema;
 40   end;
 41 
 42 
 43   // ************************************************************************ //
 44   // Namespace : http://WebXml.com.cn/
 45   // soapAction: http://WebXml.com.cn/%operationName%
 46   // transport : http://schemas.xmlsoap.org/soap/http
 47   // binding   : WeatherWebServiceSoap
 48   // service   : WeatherWebService
 49   // port      : WeatherWebServiceSoap
 50   // URL       : http://www.webxml.com.cn/WebServices/WeatherWebService.asmx
 51   // ************************************************************************ //
 52   WeatherWebServiceSoap = interface(IInvokable)
 53   ['{0AF62441-3FA0-F5D8-B6B8-B486F32F9DDE}']
 54     function  getSupportCity(const byProvinceName: WideString): ArrayOfString; stdcall;
 55     function  getSupportProvince: ArrayOfString; stdcall;
 56     function  getSupportDataSet: getSupportDataSetResult; stdcall;
 57     function  getWeatherbyCityName(const theCityName: WideString): ArrayOfString; stdcall;
 58     function  getWeatherbyCityNamePro(const theCityName: WideString; const theUserID: WideString): ArrayOfString; stdcall;
 59   end;
 60 
 61 function GetWeatherWebServiceSoap(UseWSDL: Boolean=System.False; Addr: string=''; HTTPRIO: THTTPRIO = nil): WeatherWebServiceSoap;
 62 
 63 
 64 implementation
 65 
 66 function GetWeatherWebServiceSoap(UseWSDL: Boolean; Addr: string; HTTPRIO: THTTPRIO): WeatherWebServiceSoap;
 67 const
 68   defWSDL = 'http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl';
 69   defURL  = 'http://www.webxml.com.cn/WebServices/WeatherWebService.asmx';
 70   defSvc  = 'WeatherWebService';
 71   defPrt  = 'WeatherWebServiceSoap';
 72 var
 73   RIO: THTTPRIO;
 74 begin
 75   Result := nil;
 76   if (Addr = '') then
 77   begin
 78     if UseWSDL then
 79       Addr := defWSDL
 80     else
 81       Addr := defURL;
 82   end;
 83   if HTTPRIO = nil then
 84     RIO := THTTPRIO.Create(nil)
 85   else
 86     RIO := HTTPRIO;
 87   RIO.HTTPWebNode.UseUTF8InHeader:= True;  //这里加上这一句
 88   try
 89     Result := (RIO as WeatherWebServiceSoap);
 90     if UseWSDL then
 91     begin
 92       RIO.WSDLLocation := Addr;
 93       RIO.Service := defSvc;
 94       RIO.Port := defPrt;
 95     end else
 96       RIO.URL := Addr;
 97   finally
 98     if (Result = nil) and (HTTPRIO = nil) then
 99       RIO.Free;
100   end;
101 end;
102 
103 
104 initialization
105   InvRegistry.RegisterInterface(TypeInfo(WeatherWebServiceSoap), 'http://WebXml.com.cn/', 'utf-8');
106   InvRegistry.RegisterDefaultSOAPAction(TypeInfo(WeatherWebServiceSoap), 'http://WebXml.com.cn/%operationName%');
107   RemClassRegistry.RegisterXSInfo(TypeInfo(ArrayOfString), 'http://WebXml.com.cn/', 'ArrayOfString');
108   RemClassRegistry.RegisterXSClass(getSupportDataSetResult, 'http://WebXml.com.cn/', 'getSupportDataSetResult');
109   InvRegistry.RegisterInvokeOptions(TypeInfo(WeatherWebServiceSoap), ioDocument);//这里加上这一句
110 
111 end.

自动生成的WebService文件