A SqlConnection consists of two parts: the public instance that your code interacts with (the outer connection) and a hidden connection that represents an actual server connection (the inner connection). When you call the Open method on the outer con
git schnnel failed to receive handshake, SSLTLS connection failed 报错,查看原因为git安装时ssl选择的不是openssl.重新安装后解决 fatal: unable to access 'https://gitlab.com/xxxx.git': OpenSSL SSL_connect: Connection was reset in connection to gitlab.com:443 原因为GFW问题,设置本地HTTP
转自:http://blog.sina.com.cn/s/blog_6739945f0100zt4b.html 在 Linux 下,不管你是启动一个桌面程序也好,还是在控制台下运行命令,所有的程序在结束时,都会返回一个数字值,这个值叫做返回值,或者称为错误号 ( Error Number ). 在控制台下,有一个特殊的环境变量 $?,保存着前一个程序的返回值,我们可以试试: $ ls *.pngDiagram1.png eqn.png peazip.pngeqn4.png