42.管道,cmd执行指令写到管道中

 #define _CRT_SECURE_NO_WARNINGS
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <Windows.h>

 7 int exeshell(char *cmd, char *result)//传递指令,返回结果
 8 {
 9     FILE *pf = _popen(cmd, "r");//打开一个管道,用管道执行cmd,结果存放在管道中
10     if (pf == NULL)
11     {
12         printf("创建管道失败");
13         return 0;
14     }
15     else
16     {
17         while (!feof(pf))//如果没有到文件末尾
18         {
19             char str[256] = { 0 };
20             if (fgets(str, 256, pf))//返回值是读到多少个字符
21             {
22                 strcat(result, str);//拼接字符串
23             }
24         }
25         _pclose(pf);//关闭管道
26
27         return 1;
28     }
29 }

 void main()
 {
     char result[ * ] = {  };//缓冲区

     if (exeshell("tasklist", result)!=)
     {
         printf("%s", result);
     }

     char *p = strstr(result, "QQ.exe");

     int i = ;
     for (char *p = strstr(result, "QQ.exe"); p != NULL; p = strstr(p+,"QQ.exe"))
     {
         i++;
         printf("QQ运行了%d个\n", i);
     }

     if (p != NULL)
     {
         MessageBoxA(, "QQ运行中", "提示", );
     }
     else
     {
         MessageBoxA(, "不在运行", "提示", );
     }

 }