【编程概念】---文件读写实例

实例1：读写字符文件，每次读取一个字符。

#include <stdio.h>

int main()

{

FILE *fpin ;

FILE *fpout;

char c;

fpout=fopen("c:\\dest.txt","wt");

if((fpin=fopen("c:\\test.txt","rt"))!=NULL)

{

c =fgetc(fpin);

while(c!=EOF)

{

fputc(c,fpout);

c=fgetc(fpin);

}

}

else

{

printf("file not exist!");

exit(1);

}

fclose(fpin);

fclose(fpout);

return 0;

}

实例2：读取字符文件，每次读入一个缓存里面。

#include <stdio.h>

#define MAXLEN 1024

int main()

{

FILE *fin;

FILE *fout=fopen("c:\\dest.txt","wt");

char buf[MAXLEN];

if((fin=fopen("c:\\test.txt","rt"))!=NULL)

{

char* c =fgets(buf,MAXLEN,fin);

while(c!=0)

{

fputs(buf,fout);

c=fgets(buf,MAXLEN,fin);

}

}

else

{

printf("file not exist!");

exit(1);

}

fclose(fin);

fclose(fout);

return 0;

}

实例3：读写字节文件，每次读入一个缓存里面。

#include <stdio.h>

#define MAXLEN 1024

int main()

{

FILE *fpin ;

FILE *fpout;

unsigned char buf[MAXLEN];

int c;

fpout=fopen("c:\\dest.jpg","wb");

if((fpin=fopen("c:\\test.jpg","rb"))!=NULL)

{

c = fread(buf,sizeof(unsigned char),MAXLEN,fpin);

while(c!=0)

{

fwrite(buf,sizeof(unsigned char),c,fpout);

c=fread(buf,sizeof(unsigned char),MAXLEN,fpin);

}

}

else

{

printf("file not exist!");

exit(1);

}

fclose(fpin);

fclose(fpout);

return 0;

}