[C++知识库]C++ 判断文件是否存在 不存在创建函数

//判断文件夹是否存在不存在创建
int QueryFolder(CString dir)
{
if (dir[dir.GetLength() - 1] != ‘/’)
{
dir += ‘/’;
}
CString strName = dir;
CString strDecompose;
while (1)
{
int nRetFind = strName.Find(’/’);
if (nRetFind == -1)
{
break;
}
strDecompose += strName.Left(nRetFind + 1);
strName.Delete(0, nRetFind + 1);
if (!PathIsDirectory(strDecompose))//判断路径是否存在
{
if (CreateDirectory(strDecompose, NULL) == 0)//新建文件夹
{
int aa = GetLastError();
return 1;
};
}
}
return 0;//can not make a dir;
}

//判断文件夹是否存在不存在创建
int QueryFolder(const char* dir)
{
int m = 0, n;
std::string str1, str2;
str1 = dir;
str2 = str1.substr(0, 2);
str1 = str1.substr(3, str1.size());
int nErrorRet = 0;
while (m >= 0)
{
m = str1.find(’\’);

	str2 += '\\' + str1.substr(0, m);
	n = _access(str2.c_str(), 0); //判断该目录是否存在
	if (n == -1)
	{
		nErrorRet = _mkdir(str2.c_str());     //创建目录 返回-1出现错误		
	}

	str1 = str1.substr(m + 1, str1.size());
}
return nErrorRet;//can not make a dir;

}