MFC中 CSting与std::string互相转换

1.说明，需要借助于CStringA类作为中间转换一下，我定义函数如下

std::string CSendEmail::CString2string(CString &str)

{

if(str.IsEmpty())

return 0;

CStringA strA;

std::string strs;

strA = str.GetBuffer(0);

str.ReleaseBuffer();

strs = strA.GetBuffer(0);

strA.ReleaseBuffer();

return strs;

}