带有OPC XML-DA的gSOAP添加属性

时间:2012-06-27 13:31:26

标签: c++ xml wsdl gsoap opc

我正在尝试开发一个可以通过OPC XML-DA规范访问数据的soap客户端:Here

我使用了gSOAP提供的工具从OPC Foundations WSDL生成gSOAP头文件。 (以下相关部分)

我似乎无法让gSOAP正确地向标签添加属性。 (参见下面的输出部分)。是否有内置的方法来执行此操作,还是需要修改WSDL / gSOAP标头?

WSDL提取:

<s:complexType name="ItemValue">
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="DiagnosticInfo" type="s:string" />
<s:element minOccurs="0" maxOccurs="1" name="Value" />
<s:element minOccurs="0" maxOccurs="1" name="Quality" type="s0:OPCQuality" />
</s:sequence>
<s:attribute name="ValueTypeQualifier" type="s:QName" />
<s:attribute name="ItemPath" type="s:string" />
<s:attribute name="ItemName" type="s:string" />
<s:attribute name="ClientItemHandle" type="s:string" />
<s:attribute name="Timestamp" type="s:dateTime" />
<s:attribute name="ResultID" type="s:QName" />
</s:complexType>

生成的gSOAP标题

class ns1__ItemValue
{ public:
/// Element DiagnosticInfo of type xs:string.
    char*                                DiagnosticInfo                 0;  ///< Optional element.
/// Element 'Value' has no type or ref: assuming XML content.
    _XML                                 Value                          0;  ///< Optional element.
/// Element Quality of type "http://opcfoundation.org/webservices/XMLDA/1.0/":OPCQuality.
    ns1__OPCQuality*                     Quality                        0;  ///< Optional element.
/// Attribute ValueTypeQualifier of type xs:QName.
   @_QName                               ValueTypeQualifier             0;  ///< Optional attribute.
/// Attribute ItemPath of type xs:string.
   @char*                                ItemPath                       0;  ///< Optional attribute.
/// Attribute ItemName of type xs:string.
   @char*                                ItemName                       0;  ///< Optional attribute.
/// Attribute ClientItemHandle of type xs:string.
   @char*                                ClientItemHandle               0;  ///< Optional attribute.
/// Attribute Timestamp of type xs:dateTime.
   @time_t*                              Timestamp                      0;  ///< Optional attribute.
/// Attribute ResultID of type xs:QName.
   @_QName                               ResultID                       0;  ///< Optional attribute.
/// A handle to the soap struct that manages this instance (automatically set)
    struct soap                         *soap                          ;
};

生成代码

class SOAP_CMAC ns1__ItemValue
{
public:
    char *DiagnosticInfo;   /* optional element of type xsd:string */
    char *Value;    /* optional element of type xsd:anyType */
    class ns1__OPCQuality *Quality; /* optional element of type ns1:OPCQuality */
    char *ValueTypeQualifier;   /* optional attribute */
    char *ItemPath; /* optional attribute */
    char *ItemName; /* optional attribute */
    char *ClientItemHandle; /* optional attribute */
    time_t *Timestamp;  /* optional attribute */
    char *ResultID; /* optional attribute */
    struct soap *soap;  /* transient */
public:
    virtual int soap_type() const { return 18; } /* = unique id SOAP_TYPE_ns1__ItemValue */
    virtual void soap_default(struct soap*);
    virtual void soap_serialize(struct soap*) const;
    virtual int soap_put(struct soap*, const char*, const char*) const;
    virtual int soap_out(struct soap*, const char*, int, const char*) const;
    virtual void *soap_get(struct soap*, const char*, const char*);
    virtual void *soap_in(struct soap*, const char*, const char*);
             ns1__ItemValue() : DiagnosticInfo(NULL), Value(NULL), Quality(NULL), ValueTypeQualifier(NULL), ItemPath(NULL), ItemName(NULL), ClientItemHandle(NULL), Timestamp(NULL), ResultID(NULL), soap(NULL) { }
    virtual ~ns1__ItemValue() { }
};

输出

<ns1:Items
    ClientItemHandle="Channel1.Device1"
    ItemName="Channel_1.Device_1.Tag_1"
    ValueTypeQualifier="xsd:unsignedInt">
    <Value
        xmlns="http://opcfoundation.org/webservices/XMLDA/1.0/">
        5
    </Value>
</ns1:Items>

需要的输出

<ns1:Items
    ClientItemHandle="Channel1.Device1"
    ItemName="Channel_1.Device_1.Tag_1"
    ValueTypeQualifier="xsd:unsignedInt">
    <Value
        xmlns="http://opcfoundation.org/webservices/XMLDA/1.0/"
        xsi:Type="xsd:unsignedInt">
        5
    </Value>
</ns1:Items>

输出表示通过网络生成并发送到远程服务器的XML。

2 个答案:

答案 0 :(得分:1)

这可能会有所帮助。我现在无法测试它,所以这只是一个建议。看看'Void指针':http://www.cs.fsu.edu/~engelen/soapdoc2.html#tth_sEc11.9

struct myStruct 
{ 
   int __type; // the SOAP_TYPE pointed to by p 
   void *p; 
};

据我从文档中了解,这用于序列化任何东西,并指定它的类型。 因此,使用此结构替换Value元素的_XML类型可能会有效。 然后,您只需使用相应的值设置__type属性:

struct ns1_Value {
   int __type; // the SOAP_TYPE pointed to by p 
   void *p; 
}
struct ns1_Value value; 
int n; 
value.p = &n; 
value.__type = SOAP_TYPE_int; 

解决问题的另一种方法可能是序列化原始xml而不是&lt; Value&gt; element ...或者想到一些xs:扩展xs:anyType的元素,但是定义了一个xs:type .. 实际上gSoap是一款很酷的产品,但为了充分利用它,你需要学习如何破解它。

答案 1 :(得分:1)

@Tisho,谢谢你的意见。

事实证明,OPC Foundation提供的WSDL缺少在value元素上指定类型。我们的解决方案是添加一种s:anyType,这允许我们使用多态类型,例如:
xsd_ unsignedInt的
XSD
_string
xsd__anyType

由于包含了从xsd__anyType继承的所有类型以及虚拟soap_type函数,我们可以使用任何类型,并将它们存储在值中,然后gSOAP神奇地使用soap_type来确定var的类型。

OPC Foundation的WSDL修改版的相关部分:

<s:complexType name="ItemValue">
  <s:sequence>
    <s:element minOccurs="0" maxOccurs="1" name="DiagnosticInfo" type="s:string"/>
    <s:element minOccurs="0" maxOccurs="1" name="Value" type="s:anyType"/> <!-- Here -->
    <s:element minOccurs="0" maxOccurs="1" name="Quality" type="s0:OPCQuality"/>
  </s:sequence>
  <s:attribute name="ValueTypeQualifier" type="s:QName"/>
  <s:attribute name="ItemPath" type="s:string"/>
  <s:attribute name="ItemName" type="s:string"/>
  <s:attribute name="ClientItemHandle" type="s:string"/>
  <s:attribute name="Timestamp" type="s:dateTime"/>
  <s:attribute name="ResultID" type="s:QName"/>
</s:complexType>

这是新的gSOAP生成标题

class ns1__ItemValue : public xsd__anyType
{ public:
/// Element DiagnosticInfo of type xs:string.
    char*                                DiagnosticInfo                 0;  ///< Optional element.
/// Element Value of type xs:anyType.
    xsd__anyType*                        Value                          0;  ///< Optional element.
/// Element Quality of type "http://opcfoundation.org/webservices/XMLDA/1.0/":OPCQuality.
    ns1__OPCQuality*                     Quality                        0;  ///< Optional element.
/// Attribute ValueTypeQualifier of type xs:QName.
   @_QName                               ValueTypeQualifier             0;  ///< Optional attribute.
/// Attribute ItemPath of type xs:string.
   @char*                                ItemPath                       0;  ///< Optional attribute.
/// Attribute ItemName of type xs:string.
   @char*                                ItemName                       0;  ///< Optional attribute.
/// Attribute ClientItemHandle of type xs:string.
   @char*                                ClientItemHandle               0;  ///< Optional attribute.
/// Attribute Timestamp of type xs:dateTime.
   @time_t*                              Timestamp                      0;  ///< Optional attribute.
/// Attribute ResultID of type xs:QName.
   @_QName                               ResultID                       0;  ///< Optional attribute.
};