在VC++开发中，经常会用到string和wstring，这就需要二者之间的转换，项目中封装了wstring和string相互转换的2个函数，实现如下：
//将wstring转换成string
std::string ConvertWStringToAnsi(std::wstring wstr)
{
std::string result;
int len = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL);
if( len <= 0 )
return result; char* buffer = new char[len + 1];
if(buffer == NULL )
return result; WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL);
buffer[len] = '\0'; //字符串断尾
result.append(buffer); //赋值
delete[] buffer; //删除缓冲区 //返回值
return result;
} //将string转换成wstring
std::wstring ConvertAnsiToWString(std::string str)
{
std::wstring result; int len = MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), NULL, 0);
if( len < 0 )
return result; wchar_t* buffer = new wchar_t[len + 1];
if( buffer == NULL )
return result; MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), buffer, len); buffer[len] = '\0'; //字符串断尾
result.append(buffer); //赋值
delete[] buffer; //删除缓冲区 //返回值
return result;
}