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expect的if分支有关问题

发布时间: 2012-11-09 10:18:48 作者: rapoo

expect的if分支问题
为什么expect中send的数据还留在缓存呢??


cp.sh的expect脚本如下:

C/C++ code
#!/usr/local/bin/expect # 解释器声明set timeout -1# 设置超时时间,单位秒 #scp拷贝指令spawn .1expect {"*num*" { send "34\r"; exp_continue}"yes/no" { send "yes\r"; exp_continue}"*password*" {send "123456\r"}}expect eof# 模拟结束,把控制权交还控制台,如果不加这个,就等于直接退出了#interact 


1.c的源文件如下:
C/C++ code
#include <stdio.h>int main(){    int a = 0;    char password[20] = {0};        printf("please input a num:");    scanf("%d", &a);        printf("this num is %d !\n", a);        fflush(stdout);    printf("please input a password:");    scanf("%s", password);        printf("this password is %s !\n", password);    return 0;}



运行的结果是:
C/C++ code
root@192.168.200.207[root@localhost 1020]# ./cp.shspawn ./1please input a num:34this num is 34 !please input a password:34this password is 34 !123456root@192.168.200.207[root@localhost 1020]#


[解决办法]
please input a num:34
this num is 34 !
please input a password:34
this password is 34 !
123456

这部分内容的问题,分析一下代码:
int main()
{
int a = 0;
char password[20] = {0};

printf("please input a num:");
scanf("%d", &a);
printf("this num is %d !\n", a);

fflush(stdout);
printf("please input a password:");
scanf("%s", password);
printf("this password is %s !\n", password);

return 0;
}

当执行到printf("please input a num:");时候,会匹配到num这一行,这时expect会返回一个数字,然后再执行printf("this num is %d !\n", a); 这个时候会再一次的匹配上num那一行,同理password也是一样的。

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