c语言如何读取内存

正常情况下，都是分配内存空间 然后读取

char *buf = malloc(123)

再访问buf

在嵌入式或者单片机中，有时会访问绝对地址

unsigned char * p = (unsigned char *)0xB1234456/和辩/内存地慧棚历址值

然后通过*p访问该地址。前搜

分配内存空宏袜间然后读取

#include<stdio.h>

#include<stdlib.h>

intfilelength(FILE*fp)

char*readfile(char*path)

intmain(void)

{

FILE*fp

char*string

string=readfile("c:/c.c")

printf("读入完毕\n按任意键释放内存资源\n")

//printf("%s\n",string)

system("pause")

return0

}

char*readfile(char*path)

{

FILE*fp

intlength

char*ch

if((fp=fopen(path,"r"))==NULL)

{

printf("谈拦openfile%serror.\n",path)

exit(0)

}

length=filelength(fp)

ch=(char*)malloc(length)

fread(ch,length,1,fp)

*(ch+length-1)='\0'

returnch

}

intfilelength(FILE*fp)

{

intnum

fseek(fp,0,SEEK_END)

num=ftell(fp)

fseek(fp,0,SEEK_SET)

returnnum

}

扩展资料

cLinux进程间通信共享内存：

#include"comm.h"

staticintcommShm(intsize,intflags)//创建共享内存

{

key_tkey=ftok(PATHNAME,PROJ_ID)

if(key<0){

perror("ftok")

return-1

}

intshmid=shmget(key,size,flags)

if(shmid<0){

perror("shmget"含绝胡)

return-2

}

returnshmid

}

intcreateShm(intsize)

{

returncommShm(size,IPC_CREAT|IPC_EXCL)

}

intgetShm(intsize)//获取共享内存

{

returncommShm(size,IPC_CREAT)

}

intdestoryShm(intshmid)//销毁共享内存

{

if(shmctl(shmid,IPC_RMID,NULL)<0){

perror("shmctl")

return-3

}

}

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