由进程名字获取进程 ID

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方法一：

pid_t getProcessPidbyName(char *name){    FILE *fptr;    char *buf = new char[255];    char cmd[255] = {'\0'};    pid_t pid = -1;    sprintf(cmd,"pidof %s",name);    if((fptr = popen(cmd,"r")) != NULL)    {        if(fgets(buf,255,fptr) != NULL)        {            pid = atoi(buf);            printf("pid = %d\n",pid);        }    }    pclose(fptr);    delete buf;    return pid;}/*********************************************************** 来自：http://blog.csdn.net/bulreed/article/details/6682811************************************************************/

方法二：

int main(){    FILE *fp_handle;    DIR *process_dir;    struct dirent *ptr;    SVPBool process_flag = SVP_FALSE;    SVPChar buf[256] = {'\0'};    SVPChar filepath[128] = {'\0'};    SVPChar cur_task_name[128] = {'\0'};    process_dir = opendir("/proc");    if (SVP_NULL != process_dir)    {        while((ptr = readdir(process_dir)) != SVP_NULL) //循环读取路径下的每一个文件/文件夹        {            //如果读取到的是"."或者".."则跳过，读取到的不是文件夹名字也跳过            if(DT_DIR != ptr->d_type)                continue;            if ((strcmp(ptr->d_name, ".") == 0) || (strcmp(ptr->d_name, "..") == 0))                             continue;            if(atoi(ptr->d_name) < 1130)                continue;            sprintf(filepath, "/proc/%s/status", ptr->d_name);//生成要读取的文件的路径            fp_handle = fopen(filepath, "r");//打开文件            if (NULL != fp_handle)            {                if( fgets(buf, 255, fp_handle)== SVP_NULL ){ //如果文件夹为空就跳过                    fclose(fp_handle);                    continue;                }                sscanf(buf, "%*s %s", cur_task_name);                //如果文件内容满足要求则打印路径的名字（即进程的PID）                if (strcmp(SVP_RCHMI_PROCESS_NAME, cur_task_name) == 0)                {                    process_flag = SVP_TRUE;                    printf("PID:  %s\n", ptr->d_name);                    fclose(fp_handle);                    break;                }            }        }     }    closedir(process_dir);//关闭路径    return process_flag;}

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