如何在 C++ 中将 CString 转换为双精度值？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/916790/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I convert a CString to a double in C++?
提问by Steve Duitsman
How do I convert a CStringto a doublein C++?
如何在 C++ 中将CStringa转换为 a double？
Unicode support would be nice also.
Unicode 支持也很好。
Thanks!
谢谢！
回答by Silfverstrom
A CStringcan convert to an LPCTSTR, which is basically a const char*(const wchar_t*in Unicode builds).
ACString可以转换为 an LPCTSTR，这基本上是 a const char*(const wchar_t*在 Unicode 版本中)。
Knowing this, you can use atof():
知道这一点，您可以使用atof()：
CString thestring("13.37");
double d = atof(thestring).
...or for Unicode builds, _wtof():
...或对于 Unicode 构建，_wtof()：
CString thestring(L"13.37");
double d = _wtof(thestring).
...or to support both Unicode and non-Unicode builds...
...或同时支持 Unicode 和非 Unicode 构建...
CString thestring(_T("13.37"));
double d = _tstof(thestring).
(_tstof()is a macro that expands to either atof()or _wtof()based on whether or not _UNICODEis defined)
(_tstof()是一个宏，扩展为atof()或_wtof()基于是否_UNICODE定义)
回答by MighMoS
You can convert anything to anythingusing a std::stringstream. The only requirement is that the operators >>and <<be implemented. Stringstreams can be found in the <sstream>header file.
您可以将任何东西任何东西使用std::stringstream。唯一的要求是操作符>>和<<被执行。Stringstreams 可以在<sstream>头文件中找到。
std::stringstream converter;
converter << myString;
converter >> myDouble;
回答by Sahas
with the boost lexical_cast library, you do
使用 boost lexical_cast 库，你可以
#include <boost/lexical_cast.hpp>
using namespace boost;
...
double d = lexical_cast<double>(thestring);
