C语言 如何在C程序中使用环境变量
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How to use environment variable in a C program
提问by Alex
I need to know a way for use environment variables in the C programming language. How can I use and read them?
我需要知道一种在 C 编程语言中使用环境变量的方法。我如何使用和阅读它们？
For example, read an environment variable or take the value of an environment variable and load it in another variable.
例如，读取环境变量或获取环境变量的值并将其加载到另一个变量中。
回答by ameyCU
You can use following functions -
您可以使用以下功能 -
char * getenv (const char *name)-returns a string that is the value of the environment variable name.
char * getenv (const char *name)- 返回一个字符串，它是环境变量名称的值。
char * secure_getenv (const char *name)
char * secure_getenv (const char *name)
Read about some more functions here -http://www.gnu.org/software/libc/manual/html_node/Environment-Access.html#Environment-Access
在此处阅读更多功能 - http://www.gnu.org/software/libc/manual/html_node/Environment-Access.html#Environment-Access
回答by Deepesh
#include<stdio.h>
int main(int argc,char **argv,char** envp)
{
char** env;
for(env=envp;*env!=0;env++)
{
char* thisEnv = *env;
printf("%s\n",thisEnv);
}
return 0;
}
thats how you can get those variables
这就是你如何获得这些变量
