使用 sscanf 来增加日期
我正在尝试使用 sscanf 来分隔具有提升日期的字符串。这是代码：
std::sscanf(ss.c_str(),"%ls\t%lf\t%lf",&date1_,&num1_,&num2_);
我收到以下错误：
warning: format ‘%ls’ expects type ‘wchar_t*’, but argument 3 has type ‘boost::gregorian::date*’
任何人都可以建议我解决此问题。谢谢！
I am trying to use sscanf to separate a string that has a boost date. here's the code:
std::sscanf(ss.c_str(),"%ls\t%lf\t%lf",&date1_,&num1_,&num2_);
and I get the following error:
warning: format ‘%ls’ expects type ‘wchar_t*’, but argument 3 has type ‘boost::gregorian::date*’
can anyone suggest me a fix for this. thx!
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不能这样做。
sscanf是一个 C 函数，只能读取基本类型，不能读取类类型。在 C++ 中，用于读取/写入类类型的枪是“流”，并出现在
operator<<和operator>>，它们就会起作用。如果没有，那么最好的办法是逐一读取日期字段（作为基本类型），然后使用其构造函数创建一个
boost::gregorian::date对象。It cannot be done this way.
sscanfis a C function and can only read primitive types, not class types.In C++ the guns for reading/writing class types are "streams" and come in
<iostream>and<sstream>headers. They will work if the authors of the Boost library you're using were kind enough to overloadoperator<<andoperator>>for this class.If the didn't, then your best shot is to read the date fields (as basic types) one-by-one and then create a
boost::gregorian::dateobject using its constructor.