一種在linux下啓動shell進程並取得控制檯輸出的方法

windows下通過如下方法可以實現啓動一個shell進程並等待進程結束取得進程返回值

//SHELLEXECUTEINFO ShExecInfo = {0};

nRetCode = ShellExecuteEx(&ShExecInfo);

WaitForSingleObject(ShExecInfo.hProcess, INFINITE);

GetExitCodeProcess(ShExecInfo.hProcess, &dwRetCode);

linux下無論fork() execXXX() system（） waitpid()都無法實現類似需求。

用如下方法可以實現類似需求，前提是被調進程需要在控制檯上輸出如下內容 "my exit code is XXX"

int pipe_execute(const char * cmdstring){

char buff[512];

FILE *fstream=NULL;

int ret = -1;

memset(buff,0,sizeof(buff)); 

if(NULL==(fstream=popen(cmdstring,"r")))     

{    

fprintf(stderr,"execute command [%s] failed: %s",cmdstring,strerror(errno));     

return -1;     

}

while (fgets(buff, sizeof(buff), fstream))

{

printf(">%s",buff);

int t = 0;

if (sscanf(buff, " my exitcode is %d", &t))

{

ret = t;

printf("|fetched result %d", ret);

}

}   

pclose(fstream);

return ret;

}