C++字符串编码转换

在C++经常遇到字符串的编码转换，写了个通用类，供大家参考。head文件wide_string.h内容如下：

/*
 * 宽字符串
 */
class WideString
{

    //wchar_t;
    wchar_t* ws;
    //初始化
    void init(char*, unsigned int);

    public:
        /*
         * 构造函数，将传入的字符串转换成wchar_t;
         */
        WideString(char*);
        /*
         * 构造函数，将传入的字符串转换成wchar_t;
         */
        WideString(char*, unsigned int);
        /*
         * 析构函数,释放wchar_t;
         */
        ~WideString();
        /*
         * 转换成UTF-8字符串
         */
        void toUTF8String(char*);
        /*
         * 获取UTF-8字符串长度
         */
        unsigned int getUTF8StringLength();
        /*
         * 转换成默认编码字符串
         */
        void toDefaultString(char*);
        /*
         * 获取默认编码字符串长度
         */
        unsigned int getDefaultStringLength();
        /*
         * 转换成MultiBytes字符串
         */
        void toMultiBytesString(char*, unsigned int);
        /*
         * 获取MultiBytes字符串长度
         */
        unsigned int getMultiBytesStringLength(unsigned int);
};

wide_string.cpp内容如下：

#include <windows.h>
#include "wide_string.h"


//创建函数
WideString::WideString(char* cs)
{
    this->init(cs, CP_ACP);
}
//创建函数
WideString::WideString(char* cs, unsigned int codePage)
{
    this->init(cs, codePage);
}
//初始化操作
void WideString::init(char* cs, unsigned int codePage)
{
    int wsLength = 0;
    wsLength = MultiByteToWideChar(codePage,0,cs,-1,NULL,NULL);  //获取转换到Unicode编码后所需要的字符空间长度
    this->ws = new wchar_t[wsLength + 1];
    wsLength = MultiByteToWideChar(codePage,0,cs,-1,this->ws ,wsLength);  //转换到Unicode编码
    if(!wsLength)  //转换失败则出错退出
        return;
}
//析构函数
WideString::~WideString()
{
    if(this->ws)
    {
        delete []this->ws;
    }
}

//获取转换的UTF8字符串长度
unsigned int WideString::getUTF8StringLength()
{
    return this->getMultiBytesStringLength(CP_UTF8);
}
//转换的UTF8字符串
void WideString::toUTF8String(char* cs)
{
    this->toMultiBytesString(cs, CP_UTF8);
}
//获取转换的默认编码字符串长度
unsigned int WideString::getDefaultStringLength()
{
    return this->getMultiBytesStringLength(CP_ACP);
}
//转换的默认编码字符串
void WideString::toDefaultString(char* cs)
{
    this->toMultiBytesString(cs, CP_ACP);
}
//获取转换的MultiBytes字符串长度
unsigned int WideString::getMultiBytesStringLength(unsigned int codePage)
{
    int mbLength = 0;
    mbLength = WideCharToMultiByte(codePage,0,this->ws,-1,NULL,0,NULL,NULL);  //获取转换到MultiBytes编码后所需要的字符空间长度
    return mbLength;
}
//转换的MultiBytes字符串
void WideString::toMultiBytesString(char* cs, unsigned int codePage)
{
    int mbLength = 0;
    mbLength = WideCharToMultiByte(codePage,0,this->ws,-1,NULL,0,NULL,NULL);  //获取转换到MultiBytes编码后所需要的字符空间长度
    if( strlen(cs) < mbLength)
    {
         throw ;
    }
    mbLength = WideCharToMultiByte(codePage,0,this->ws,-1,cs,mbLength,NULL,NULL);  //转换到MultiBytes编码
    if(!mbLength)
    {
        return;
    }
}