char *到const wchar_t *转换 [英] char* to const wchar_t * conversion

问题描述

我需要将字符指针转换为w_char *，以便使用ParseNetworkString（）。我已经尝试找到解决方案，我自己，虽然我找到一个解决方案，有一个问题，阻止我使用它：

b1naryatr0phy在另一篇文章：

  std :: wstring name（LSteve Nash）; 
 const wchar_t * szName = name.c_str（）; 
 

这对我来说几乎是有效的，除了我不能只传递字符串显式性并不总是相同的，这意味着我不能把它在引号。如果我用一个函数调用替换参数，那么第一行给我一个错误（例如：std :: wstring name（LgetIpAddress（））;我试过std :: wstring name（L+ getIpAddress ）;，认为它只是需要一个引号在L后，但是不工作，任何建议？

谢谢！

链接到其他帖子： stackoverflow.com/questions/246806/i-want-to-convert-stdstring-into-a-const-wchar-t>我想将std :: string转换为const wchar_t *

PS对不起，只是为了澄清，getIpAddress返回一个字符指针

解决方案

getIpAddress / code>？

这是一个代码片段，显示如何将字符串转换为 wstring （使用标准C ++ 11，无错误检查）：

  wstring to_wstring string const& str）
 {
 size_t len = mbstowcs（nullptr，& str [0]，0）; 
 if（len == -1）//无效的源str，throw 
 wstring wstr（len，0）; 
 mbstowcs（& wstr [0]，& str [0]，wstr.size（））; 
 return wstr; 
} 
  

I need to convert character pointer to a w_char * in order to use ParseNetworkString(). I've tried finding solutions to this myself, and while I have found one solution, there is one issue which blocks me from using it:

b1naryatr0phy said in an other post:

std::wstring name( L"Steve Nash" );
const wchar_t* szName = name.c_str();

this almost works for me, except that I can't just pass the string explicity, as its value is not always going to be the same, meaning I can't just put it in quotes. If I replace the parameter with a function call, then the first line gives me an error (example: std::wstring name(LgetIpAddress()); I've tried std::wstring name(L" " + getIpAddress() + " "); , thinking that it just needs a quotation mark after the L, but that doesn't work either.. any suggestions?

Thanks! :)

Extra Kudos to whoever can answer this!

link to other post: I want to convert std::string into a const wchar_t *

P.S. Sorry, just to clarify, getIpAddress returns a character pointer

解决方案

What's the type of getIpAddress()?

Here's a snippet showing how to convert a string to a wstring (using standard C++11, no error checking):

wstring to_wstring(string const& str)
{
  size_t len = mbstowcs(nullptr, &str[0], 0);
  if (len == -1) // invalid source str, throw
  wstring wstr(len, 0);
  mbstowcs(&wstr[0], &str[0], wstr.size());
  return wstr;
}

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