system（）函数和当前工作目录 [英] system() function and current working directory
问题描述
我有一个问题，解决方案应该在windows和unix下运行
操作系统。
假设我在目录X中有一个程序ex.c （所以ex.c的当前
工作目录是X）。
还假设我有这段代码片段：
....
char otherpath [PATHLEN];
char cmd [CMDLEN];
....
....
otherpath =" Y" //其中y是有效的路径字符串
....
system（cmd）; //其中cmd是任何命令字符串
....
如果在cmd中指定了相对路径，它相对于当前的
工作目录（在这个例子中是X）。
有一种方法可以执行命令，这些路径是
"的相对路径。 otherpath"变量（在这个例子中是Y）？
I have a problem and the solution should works under windows and unix
OS.
Suppose I have a program ex.c in the directory X (so the current
working directory of ex.c is X).
Also suppose I have this code fragment:
....
char otherpath[PATHLEN];
char cmd[CMDLEN];
....
....
otherpath="Y" //where y is a valid path string
....
system(cmd); //where cmd is any command string
....
If in cmd is specified a relative path, it is relative to the current
working directory(in this example is X).
There is a way to execute command wich paths are relatives to the
"otherpath" variable (in this example is Y)?
推荐答案
3月21日上午9:18，gio < giorginooo.ro ... @ yahoo.itwrote：
On Mar 21, 9:18 am, "gio" <giorginooo.ro...@yahoo.itwrote:
我有问题，解决方案应该在windows下工作并且unix
OS。
I have a problem and the solution should works under windows and unix
OS.
好的，所以你正在寻找一个便携式的解决方案。
OK, so you are looking for a "portable" solution.
假设我在目录X中有一个程序ex.c（因此ex.c的当前
工作目录是X ）。
Suppose I have a program ex.c in the directory X (so the current
working directory of ex.c is X).
[snip]
[snip]
有一种方法可以执行命令，路径是
" otherpath"变量（在这个例子中是Y）？
There is a way to execute command wich paths are relatives to the
"otherpath" variable (in this example is Y)?
不幸的是（对你而言），标准C无法识别（更不用说
提供操作工具）目录或程序执行路径。 br />
你的答案在别处，因为我们在这里帮不了你。
< OT>
很可能你将找不到一个简单，便携的解决方案，你的程序将在Unix和
Windows环境中无需修改即可运行。对于Unix，
system（PATH = Y：
Unfortunately (for you), standard C does not recognize (let alone
provide tools to manipulate) directories or program execution paths.
Your answer lies elsewhere, as we can''t help you here.
<OT>
It is likely that you will not find a simple, portable solution to
your program that will work without modification in both the Unix and
Windows environments. For Unix,
system("PATH=Y:
PATH cmd）;
可能有效。但是，shell中的这个技巧不太可能适用于Windows。
< / OT>
HTH
-
Lew
PATH cmd");
may work. However, it is unlikely that this trick in the shell will
work for Windows.
</OT>
HTH
--
Lew
这可能是一个解决方案：
构建一个新的cmd，例如：
char * newcmd = malloc（3 + strlen（otherpath）+ 2 + strlen（cmd）+1）;
sprintf（newcmd，" cd％s;
This could be a solution:
Build a new cmd, e.g.:
char *newcmd = malloc(3+strlen(otherpath)+2+strlen(cmd)+1);
sprintf(newcmd, "cd %s;
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