118.编程实现添加环境变量

 1 #define _CRT_SECURE_NO_WARNINGS
 2 #include <stdio.h>
 3 #include <Windows.h>
 4 
 5 void main()
 6 {
 7     //获取环境变量
 8     char *path = getenv("PATH");
 9     //把获取的环境变量输出
10     printf("%s

", path);
11     //要添加的路径
12     char addpath[100] = ";F:\杂乱test\printf可变参数\Debug";
13     
14     //新的路径
15     char *newpath = NULL;
16     //格式化处理
17     newpath = (char *)calloc(4096, 1);
18     strcpy(newpath, "PATH=");
19     strcat(newpath, path);
20     strcat(newpath, addpath);
21 
22     //设置当前程序生效(临时环境变量)
23     _putenv(newpath);
24 
25     system("printf可变参数.exe");
26     //输出所有path的分量
27     /*int i = 0;
28     while (environ[i])
29     {
30         printf("->%s
", environ[i]);
31         i++;
32     }*/
33 
34     system("pause");
35 }