博客
关于我
c语言实现把pid值写入文件中
阅读量:409 次
发布时间:2019-03-06

本文共 473 字,大约阅读时间需要 1 分钟。

#include "stdio.h"#include "assert.h"int main(){    char buff[32];    int nPid = getpid();    snprintf(buff, 32, "%d", nPid);    //参数1:要被写入的字符串 参数2:写入的大小,防止写入大小超过数组容量     FILE *f = fopen("app_pid.info", "w");        assert(f);  //当f为0时会报错.assert只是为了对调试时有帮助,不能够代替运行时的逻辑检查。    fwrite(buff, strlen(buff), 1, f); // 参数1:要写入的字符串地址 参数2:要写入对象的大小 参数3:对象的个数 参数4:指向输出流的指针    fclose(f);    return 0;}
printf:把字符串输出到屏幕中.
sprintf:把字符内容输出到char数组中,没有大小限制
snprintf:把字符内容输出到char数组中,有大小限制.
 

转载地址:http://qibkz.baihongyu.com/

你可能感兴趣的文章
nnU-Net 终极指南
查看>>
No 'Access-Control-Allow-Origin' header is present on the requested resource.
查看>>
No 'Access-Control-Allow-Origin' header is present on the requested resource.
查看>>
NO 157 去掉禅道访问地址中的zentao
查看>>
no available service ‘default‘ found, please make sure registry config corre seata
查看>>
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
查看>>
no connection could be made because the target machine actively refused it.问题解决
查看>>
No Datastore Session bound to thread, and configuration does not allow creation of non-transactional
查看>>
No fallbackFactory instance of type class com.ruoyi---SpringCloud Alibaba_若依微服务框架改造---工作笔记005
查看>>
No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalanc
查看>>
No mapping found for HTTP request with URI [/...] in DispatcherServlet with name ...的解决方法
查看>>
No mapping found for HTTP request with URI [/logout.do] in DispatcherServlet with name 'springmvc'
查看>>
No module named 'crispy_forms'等使用pycharm开发
查看>>
No module named 'pandads'
查看>>
No module named cv2
查看>>
No module named tensorboard.main在安装tensorboardX的时候遇到的问题
查看>>
No module named ‘MySQLdb‘错误解决No module named ‘MySQLdb‘错误解决
查看>>