Linux下，使用C/C++一个简单的消息处理程序_linux c++ 键盘消息处理-优快云博客

本文介绍了一个简单的父子进程间通过管道进行通信的C语言程序示例。该程序创建了一个子进程，并利用管道在父进程和子进程之间传递字符串数据。父进程写入数据到管道，而子进程从管道读取数据并打印。

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// all.h

#ifndef _ALL_H
#define _ALL_H

// ANSC C/C++
#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
#include <assert.h>

// linux
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include<fcntl.h>

// micro define
//#define OutErrStr(info) (printf("Error : %s/n", info))

//#define OutErrInt(info) (printf("Error : %d/n", info))
#define BUFF_SIZE 1024 * 1

#endif

/* end all.h ******************************************************* */

// main.c

#include "all.h"

// function
static int ChildProcessFun(void *pParam);

// struct
struct _PROCESS_PARAM
{
#define STR_1 "This is date on pipe."
#define DADA_LEN sizeof(STR_1)
char chBuff[BUFF_SIZE];
int nPipe[2];
pid_t nProcess;
};

int main()
{
printf("Run .../n");

struct _PROCESS_PARAM ProcessParam;

int nFlag = pipe(ProcessParam.nPipe);
if (nFlag == -1)
{
printf("Error: crrete pipe failed!/n");
printf("------------------------------/n/n");
}
assert(ProcessParam.nPipe[0]);
assert(ProcessParam.nPipe[1]);

// create a child press
ProcessParam.nProcess = fork();
if (ProcessParam.nProcess < 0) /* create process failed */
{
printf("Error: create child process failed!/n");
printf("------------------------------/n/n");
}
else if (ProcessParam.nProcess > 0) /* parent process */
{
printf("/nNote: in parent process .../n");
printf("New child process ID = %d/n", ProcessParam.nProcess);

// write pipe
close(ProcessParam.nPipe[0]);
write(ProcessParam.nPipe[1], STR_1, strlen(STR_1));
}
else /* child process */
{
if(ChildProcessFun(&ProcessParam) == 0)
{
   printf("Child process exit .../n");
}
else
{
   printf("Error: Child process dead lock .../n");
   printf("------------------------------/n/n");
}
}

// close pipe
close(ProcessParam.nPipe[0]);
close(ProcessParam.nPipe[1]);
printf("parent process exit .../n");
return 0;
}

// child process funtion
static int ChildProcessFun(void *pParam)
{
struct _PROCESS_PARAM ProcessParam = /
(struct _PROCESS_PARAM) /
*(struct _PROCESS_PARAM *)pParam;

printf("Note: in child process .../n");
printf("The child process ID = %d/n", ProcessParam.nProcess);

// read pipe
close(ProcessParam.nPipe[1]);
read(ProcessParam.nPipe[0], ProcessParam.chBuff, DADA_LEN);
ProcessParam.chBuff[DADA_LEN] = '/0'; /* good action */
printf("Read the pipe data: %s/n", ProcessParam.chBuff);
printf("*********************************/n/n");
return 0;
}

/* end main.c ******************************************************* */

// -----------------------------------------------------------------------------------------------

# makefile

objets = main.o
rubbish = $(objets) main

main : main.o
g++ -o main main.o

main.o : main.c all.h
g++ -c main.c

.PHONY : clean
clean :
-rm $(rubbish)

# end makefile

/* end makefile ******************************************************* */