获得C程序系统命令输出 [英] Get system command output in C program

问题描述

有没有更好的办法做到这一点？

Is there a better way to do it?

    int numOfCPU;
    system("grep -c ^processor /proc/cpuinfo >> /tmp/cpuinfo");
    FILE *fp = fopen("/tmp/cpuinfo", "r");
    fscanf(fp, "%d", &numOfCPU);
    fclose(fp);
    system("rm /tmp/cpuinfo");

我不希望创建一个中间文件，然后将其删除。

I don't want to create an intermediary file and then remove it.

编辑：

它不是从文件中读取。该命令可以是LS或回声世界，你好

Its not about reading from the file. The command can be "ls" or "echo 'Hello world'"

推荐答案

好吧，我在其他的答案被搞糊涂了。在任何情况下，在这个答案的理念是一样的。您可以直接使用在的popen 功能。

Ok, I was confused in my other answer. In any case, the philosophy in this answer is the same. You can use directly the popen function.

然后，你有这样的事情：

Then you have something like this:

int numOfCPU;
FILE *fp = popen("grep -c ^processor /proc/cpuinfo", "r");

fscanf(fp, "%d", &numOfCPU);
pclose(fp);

我希望这将是有益的。

I hope it will be useful.

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