[英]How to import homepath into c program using gcc
I am using gcc for windows .我在windows 上使用gcc 。 The OS is windows XP .操作系统是Windows XP 。 How do I import the homepath variable into my c program so I can write to c:\\%homepath%\\desktop?如何将 homepath 变量导入到我的 c 程序中,以便我可以写入 c:\\%homepath%\\desktop? I would like to use something similar to:我想使用类似的东西:
fd = fopen("C:\\\\%%homepath%%\\\\desktop\\\\helloworld.txt","w")
; fd = fopen("C:\\\\%%homepath%%\\\\desktop\\\\helloworld.txt","w")
;
使用 getenv() 获取环境变量的值,然后使用 sprintf 或 strcat 组成路径。
Use getenv("homepath")
to get the value of environment variable.使用getenv("homepath")
获取环境变量的值。 You should handle the case in which the variable has not been defined ( getenv
returns NULL
in that case).您应该处理尚未定义变量的情况(在这种情况下getenv
返回NULL
)。
To compose the path use sprintf
使用sprintf
路径
char * homepath = getenv("homepath");
if(homepath == null) {
/* variable HOMEPATH has not been defined */
}
sprintf(path,"%s\\desktop\\helloworld.txt",homepath);
You should make path big enough to accomodate the value homepath
and \\\\desktop\\\\helloworld.txt
.您应该使路径足够大以容纳值homepath
和\\\\desktop\\\\helloworld.txt
。
Also note the use of \\\\
in the string.还要注意字符串中\\\\
的使用。 You can't use single \\
.您不能使用单个\\
。
Note: you actually need to get the value of HOMEDRIVE as well, and prepend that to HOMEPATH.注意:您实际上还需要获取 HOMEDRIVE 的值,并将其添加到 HOMEPATH。 In many corporate environments, the home directories are kept on large network appliances or servers.在许多公司环境中,主目录保存在大型网络设备或服务器上。
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