嵌入式linux文件与串口编程

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*fopen(char*name,char9例文件打开与测试例文件打开与测试 printf(“Fileopenerror!\n”);}例FILE例FILEfp=fopen例FILEchar*filename=“test.dat”fp=fopen(filename,”r”);“r/rb”只读“w/wb”只写“a/ab”追加“w+/wb+”(读写 inffcla函数原型：intfputc(intcFILE函数原型：intfgetc(FILE putchar(c) getchar() 例从键盘输入字符，逐个存到磁盘文件中，直到输入‘#“{FILEcharch,*filename=“out.txt”; printf("cannotopenfile\n");} }}{FILEcharch,*filename=“out.txt”; printf("cannotopenfile\n");}}数据块I/O:fread与size_tfread(void*buffer,size_tsize,size_tcount,FILEsize_tfwrite(void*buffer,size_tsize,size_t buffer:指向要输入/输出数据块的首地址的指针size:每个要读/写的数据块的大小（字节数）

例float例floatf[2];FILE*fp;例例struct intcharname[20]; intfloatintfprintf(FILE*fp,constchar*format[,argument,…])intfscanf(FILE*fp,constchar*format[,address,…])//若文件中有3,4.5,则将3送入i4.5送入{chars[80],c[80];inta,b;FILE*fp; puts("can'topenfile"); exit(); fprintf(fp,"%s%d",s,a);/*writetofile*/ puts("can'topenfile");exit(); fscanf(fp,"%s%d",c,&b);/*readfromfile*/}char*fgets(char*s,intn,FILE fputs(char*s,FILE

FILEcharstring[81]; printf("cann'topenfile");exit(0);} } printf("cann'topenfile");exit(0);}} voidrewind(FILE FILE*fp1,*fp2;while(!feof(fp1))putchar(getc(fp1));}

intfseek(FILE*fp,longoffset,int 012例例函数原型：long l(FILE例磁盘文件上有3个学生数据，要求读入第1，3学生数据#include<stdio.h>#include<stdio.h>struct intintage;char inti; printf("can'topenfile\n");exit(0); fseek(fp,i*sizeof(structstudent_type),0);fread(&stud[i],sizeof(structstudent_type),1,fp);printf(