将const char *转换为wstring [英] Convert const char* to wstring

问题描述

我正在开发一个基于锌的闪存应用程序的本机扩展，我需要将 const char * 转换为 wstring

这是我的代码：

  mdmVariant_t * appendHexDataToFile（const zinc4CallInfo_t * pCallInfo，int paramCount，mdmVariant_t ** params）{
 
 if（paramCount> = 2）{
 const char * file = mdmVariantGetString（params [0] ）; 
 const char * data = mdmVariantGetString（params [1]）; 
 
 return mdmVariantNewInt（native.AppendHexDataToFile（file，data））; 
} 
 else {
 return mdmVariantNewBool​​ean（FALSE）; 
} 
} 
  

但 native.AppendHexDataToFile ）需要两个 wstring 。
我对C ++不是很好，我认为所有不同的字符串类型是完全混乱，我没有找到一些有用的网。

：字符串是UTF-8，我使用的是OSX和Windows XP / Vista / 7

解决方案

我建议您使用 std :: string 而不是C风格的字符串（ char * ）。你可以通过简单地将它传递给它的构造函数从 const char * 创建 std :: string

一旦你有 std :: string ，就可以创建一个简单的函数来转换 std :: string包含多字节UTF-8字符到 std :: wstring 包含UTF-16编码点（16位表示的特殊字符从 std :: string ）。

有更多的方法可以这样做，下面是使用 MultiByteToWideChar函数：

  std :: wstring s2ws（const std :: string& str）
 {
 int size_needed = MultiByteToWideChar（CP_UTF8,0，& str [0]， ）str.size（），NULL，0）; 
 std :: wstring wstrTo（size_needed，0）; 
 MultiByteToWideChar（CP_UTF8，0，& str [0]，（int）str.size（），& wstrTo [0]，size_needed）; 
 return wstrTo;请检查这些问题：
 
 } 
  

< http://stackoverflow.com/q/6107776/1168156\">将多字节字符映射到其Unicode代码点

为什么要使用MultiByteToWideCharArray将std :: string转换为std :: wstring？

I'm working on a native extension for a zinc based flash application and I need to convert a const char* to a wstring.

This is my code:

mdmVariant_t* appendHexDataToFile(const zinc4CallInfo_t *pCallInfo, int paramCount, mdmVariant_t **params) {

    if(paramCount >= 2) {
        const char *file    = mdmVariantGetString(params[0]);
        const char *data    = mdmVariantGetString(params[1]);

        return mdmVariantNewInt(native.AppendHexDataToFile(file, data));
    }
    else {
        return mdmVariantNewBoolean(FALSE);
    }
}

But native.AppendHexDataToFile() needs two wstring. I'm not very good with C++ and I think all those different string types are totally confusing and I didn't find something useful in the net. So I'm asking you guys how to do it.

Edit: The Strings are UTF-8 and I'm using OSX and Windows XP/Vista/7

解决方案

I recommend you using std::string instead of C-style strings (char*) wherever possible. You can create std::string object from const char* by simple passing it to its constructor.

Once you have std::string, you can create simple function that will convert std::string containing multi-byte UTF-8 characters to std::wstring containing UTF-16 encoded points (16bit representation of special characters from std::string).

There are more ways how to do that, here's the way by using MultiByteToWideChar function:

std::wstring s2ws(const std::string& str)
{
    int size_needed = MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), NULL, 0);
    std::wstring wstrTo( size_needed, 0 );
    MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), &wstrTo[0], size_needed);
    return wstrTo;
}

Check these questions too:
Mapping multibyte characters to their unicode point representation
Why use MultiByteToWideCharArray to convert std::string to std::wstring?

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