将MFC的CString 类型转化为C++标准数据类型std::string

std::string CStringToSTDStr(const CString& theCStr)
{
	// Convert the CString to a regular char array
	const int theCStrLen = theCStr.GetLength();
	char *buffer = (char*)malloc(sizeof(char)*(theCStrLen+1));
	memset((void*)buffer, 0, sizeof(buffer));
	WideCharToMultiByte(CP_UTF8, 0, static_cast<cstring>(theCStr).GetBuffer(), theCStrLen, buffer, sizeof(char)*(theCStrLen+1), NULL, NULL);
	// Construct a std::string with the char array, free the memory used by the char array, and
	// return the std::string object.
	std::string STDStr(buffer);
	free((void*)buffer);
	return STDStr;
}