5.linux 下管道通信
server
#ifndef _NAMEDPIPE_SERVER_H_
#define _NAMEDPIPE_SERVER_H_
class CNamedPipeServer
{
#ifndef IN
#define IN
#endif
#ifndef OUT
#define OUT
#endif
public:
CNamedPipeServer();
~CNamedPipeServer();
/*
函数功能:创建管道
参数说明:IN const char* pipeserver 管道名称
IN bool bBlock = true 规定read的方式,默认值true,read将以阻塞的方式读数据,否则非阻塞
返回值 :成功返回true,否则返回false
*/
bool Create(IN const char* pipeserver,IN bool bBlock = true);
/*
函数功能:从管道读取数据
参数说明:OUT char* buf 输出buf的首地址
IN int nlen 输出buf的最大长度
返回值 :成功返回读取的数据的大小,失败返回0
*/
int Read(OUT char* buf,IN int nlen);
/*
函数功能:向管道写数据
参数说明:IN const char* pipename 客户端的管道名
IN const void* buf 输入buf的首地址
IN int nlen 输入buf的有效数据长度
返回值 :成功返回写入数据的大小,失败返回0
*/
int Write(IN const char* pipename,IN const void* buf,IN int nlen);
private:
void Close(int& nfd);
int m_nserverpipe;
};
#endif
#include "namedPipeServer.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
CNamedPipeServer::CNamedPipeServer()
{
m_nserverpipe = -1;
}
CNamedPipeServer::~CNamedPipeServer()
{
Close(m_nserverpipe);
}
void CNamedPipeServer::Close(int &nfd)
{
if( nfd != -1)
{
close(nfd);
nfd = -1;
}
}
bool CNamedPipeServer::Create(const char* pipeserver,bool bBlock/*=true*/)
{
if(mkfifo(pipeserver,0777) != 0 && errno != EEXIST)
goto RET_ERROR;
if(bBlock)
m_nserverpipe = open(pipeserver,O_RDWR);
else
m_nserverpipe = open(pipeserver,O_RDWR|O_NONBLOCK);
if (m_nserverpipe == -1)
goto RET_ERROR;
return true;
RET_ERROR:
Close(m_nserverpipe);
return false;
}
//大于0成功,否则失败
int CNamedPipeServer::Read(char* buf,int nlen)
{
int nRet = 0;
if (m_nserverpipe != -1 && buf != NULL)
{
nRet = (int)read(m_nserverpipe,buf,nlen);
}
return nRet;
}
//大于0成功,否则失败
int CNamedPipeServer::Write(const char* pipename,const void* buf,int nlen)
{
int nRet = 0;
int nfd = open(pipename,O_RDWR);
if(nfd != -1 && buf != NULL)
{
nRet = (int)write(nfd,buf,nlen);
Close(nfd);
}
return nRet;
}
client:
#ifndef _NAMEPIPE_CLIENT_H_
#define _NAMEPIPE_CLIENT_H_
class CNamePipeClient
{
#ifndef IN
#define IN
#endif
#ifndef OUT
#define OUT
#endif
public:
CNamePipeClient();
~CNamePipeClient();
/*
函数功能:初始化
参数说明:const char* serverpipe 服务端管道名
const char* clientpipe 客户端管道名
返回值 :成功返回true,失败返回false;
*/
bool Init(IN const char* serverpipe,IN const char* clientpipe);
/*
函数功能:读取数据
参数说明:char* buf 输出buf首地址
int nbuflen buf的最大值
返回值 :成功返回读取的数据大小,0失败
*/
int Read(OUT char* buf,IN int nbuflen);
/*
函数功能:读取数据
参数说明:const void* buf 输入buf首地址
int nbuflen 输入buf的有效数据长度
返回值 :成功返写入的数据大小,0失败
*/
int Write(IN const void* buf,IN int nbuflen);
private:
void Close(int &nfd);
bool Create(const char* clientpipe);
int m_fdclient;
int m_fdserver;
};
#endif
#include "namePipeClient.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
CNamePipeClient::CNamePipeClient()
{
m_fdclient = -1;
m_fdserver = -1;
}
CNamePipeClient::~CNamePipeClient()
{
Close(m_fdserver);
Close(m_fdclient);
}
bool CNamePipeClient::Init(const char* serverpipe,const char* clientpipe)
{
if(serverpipe == NULL || clientpipe == NULL )
return false;
m_fdserver = open(serverpipe,O_RDWR);
if(m_fdserver == -1)
return false;
return Create(clientpipe);
}
bool CNamePipeClient::Create(const char* clientpipe)
{
if(mkfifo(clientpipe,0777) != 0 && errno != EEXIST)
return false;
m_fdclient = open(clientpipe,O_RDWR);
if(m_fdclient == -1)
{
Close(m_fdserver);
return false;
}
return true;
}
void CNamePipeClient::Close(int &nfd)
{
if(nfd != -1)
{
close(nfd);
nfd = -1;
}
}
//大于0成功,否则失败
int CNamePipeClient::Read(char* buf,int nbuflen)
{
int nRet = 0;
if (m_fdclient != -1 && buf != NULL)
{
nRet = (int)read(m_fdclient,buf,nbuflen);
}
return nRet;
}
//大于0成功,否则失败
int CNamePipeClient::Write(const void* buf,int nbuflen)
{
int nRet = 0 ;
if(m_fdserver != -1 && buf != NULL)
{
nRet = (int)write(m_fdserver,buf,nbuflen);
}
return nRet;
}