如何从C程序设置(并替换现有的)默认网络路由?如果可能的话,我想在没有shell命令的情况下这样做(这是一个低内存嵌入式系统).您也可以在不指定网关IP地址的情况下设置默认路由吗?在我的应用程序中,我想将ppp0或eth0设置为默认路由,具体取决于电缆是否插入eth0.
谢谢,弗雷德
我刚刚从cygwin安装了g ++,当我尝试编译C++文件时,我没有得到编译器生成的任何可执行文件,请参阅下面的示例.出了什么问题?
Directory of C:\helloworld
01/02/2011 04:50 PM .
01/02/2011 04:50 PM ..
01/02/2011 04:48 PM 94 helloworld.cpp
1 File(s) 94 bytes
2 Dir(s) 24,658,272,256 bytes free
C:\helloworld>g++-4 helloworld.cpp
C:\helloworld>dir
Volume in drive C is OS
Volume Serial Number is C47B-942D
Directory of C:\helloworld
01/02/2011 04:50 PM .
01/02/2011 04:50 PM ..
01/02/2011 04:48 PM 94 helloworld.cpp
1 File(s) 94 bytes
2 Dir(s) 24,657,747,968 bytes free
C:\helloworld>
救命.我开始学习Scala.我的程序在我的Windows PC上正常运行,但无论何时我尝试在我的Linux机器上运行程序(ibmp2),输出只是打印两次的主机名.见下面的例子.怎么了?
[sean@ibmp2 ~]$ cat hello.scala
val oneTwo = List(1, 2)
val threeFour = List(3, 4)
val oneTwoThreeFour = oneTwo ::: threeFour
println(""+ oneTwo +" and "+ threeFour +" were not mutated.")
println("Thus, "+ oneTwoThreeFour +" is a new list.")
[sean@ibmp2 ~]$ scala hello.scala
ibmp2: ibmp2
[sean@ibmp2 ~]$ which scala
/usr/local/scala-2.8.1.final/bin/scala
[sean@ibmp2 ~]$ scala
Welcome to Scala version 2.8.1.final (Java HotSpot(TM) Client VM, Java 1.6.0_17).
Type in expressions to have them evaluated.
Type :help for more information.
scala> println("hello")
hello … 我正在编程Nexus 7.在我的程序中,我想要用户选择要使用的Wifi网络(预先配置或选择创建新网络).如何以编程方式启动该对话框?