我使用具有数字元素的 Web 服务。 Delphi wsdl 导入器将其设置为 Int64。
Web 服务允许此元素为空。但是，因为它被定义为 Int64，所以当我在 Delphi 中使用 Web 服务而不为其设置值时，它默认为 0，因为它是 Int64。但我需要它为空，并且 Web 服务不会接受 0 值(0 被定义为无效并由 Web 服务返回错误)。
如果类型是 Int64，如何传递空白值？
最佳答案
空年龄(示例)
<E06_14></E06_14>
可能有特殊含义，例如“未知”年龄。
在这种情况下，真正的问题是如何使该字段在 Delphi 端可以为空。
来自this post J.M. Babet 的:
Support for 'nil' has been an ongoing issue. Several built-in types of Delphi are not nullable. So we opted to use a class for these cases (not elegant but it works). So with the latest update for Delphi 2007 I have added several TXSxxxx types to help with this. Basically: TXSBoolean, TXSInteger, TXSLong, etc. TXSString was already there but it was not registered. Now it is. When importing a WSDL you must enable the Use 'TXSString for simple nillable types' option to make the importer switch to TXSxxxx types. On the command line it is the "-0z+" option.
DocWiki for the Import WSDL Wizard还显示了与可为空元素相关的两个选项:
Process nillable and optional elements - Check this option to make the WSDL importer generate relevant information about optional and nillable properties. This information is used by the SOAP runtime to allow certain properties be nil.
Use TXSString for simple nillable types - The WSDL standard allows simple types to be nil, in Delphi or NULL, in C++, while Delphi and C++ do not allow that. Check this option to make the WSDL importer overcome this limitation by using instances of wrapper classes.
关于web-services - Int64 类型的 Web 服务中的空白值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12434202/