【C/C++】标准IO操作

fwrite实现文件复制

 1 //@　author　成鹏致远
 2 //@　net http://infodown.tap.cn
 3 //@　qq 552158509
 4 //@ blog　lcw.cnblogs.com
 5 
 6 #include <stdio.h>
 7 #include <stdlib.h>
 8 #include <string.h>
 9 
10 #define BUFSIZE 100
11 
12 int main(int argc, char * argv[])
13 {
14     FILE *read_fp,*write_fp;
15     char buf[BUFSIZE];
16 
17     if(3 != argc)
18     {
19         printf("Usage:%s <origin_filename> <target_filename> 
",argv[0]);
20         exit(1);
21     }
22     if(NULL == (read_fp = fopen(argv[1],"r")))
23     {
24         perror("malloc");
25         exit(1);
26     }
27     if(NULL == (write_fp = fopen(argv[2],"w")))
28     {
29         perror("malloc");
30         exit(1);
31     }
32 
33     while(!feof(read_fp) && !ferror(read_fp))
34     {
35         bzero(buf,BUFSIZE);//在使用前一定要先清缓冲
36         fread(buf,BUFSIZE,1,read_fp);//读取文件
37         fwrite(buf,strlen(buf),1,write_fp);//写文件，注意要用strlen，因为最后一次可以装不满缓冲区
38     }
39 
40     fclose(read_fp);
41     fclose(write_fp);
42 
43 
44     return 0;
45 }

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fgets实现文件复制

 1 //@　author　成鹏致远
 2 //@　net http://infodown.tap.cn
 3 //@　qq 552158509
 4 //@ blog　lcw.cnblogs.com
 5 
 6 //copy file by line
 7 
 8 #include <stdio.h>
 9 #include <stdlib.h>
10 
11 #define MAXSIZE 1024
12 
13 int main(int argc, char * argv[])
14 {
15     FILE *read_fp,*write_fp;
16     char buf[MAXSIZE];
17 
18     if(3 != argc)
19     {
20         printf("Usage:%s <origin_filename> <target_filename> 
",argv[0]);
21         exit(1);
22     }
23     if(NULL == (read_fp = fopen(argv[1],"r")))
24     {
25         perror("malloc");
26         exit(1);
27     }
28     if(NULL == (write_fp = fopen(argv[2],"w")))
29     {
30         perror("malloc");
31         exit(1);
32     }
33 
34     while(NULL != fgets(buf,MAXSIZE,read_fp))//fgets()浼氭妸'
'绠楀湪缂撳啿鍖轰腑
35     {
36         fputs(buf,write_fp);//paste file
37     }
38 
39     fclose(read_fp);
40     fclose(write_fp);
41 
42     return 0;
43 }

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fgetc实现文件

 1 //@　author　成鹏致远
 2 //@　net http://infodown.tap.cn
 3 //@　qq 552158509
 4 //@ blog　lcw.cnblogs.com
 5 
 6 //copy file by char
 7 
 8 #include <stdio.h>
 9 #include <stdlib.h>
10 
11 
12 int main(int argc, char * argv[])
13 {
14     FILE *read_fp,*write_fp;
15     char tmp;
16 
17     if(3 != argc)
18     {
19         printf("Usage:%s <origin_filename> <target_filename> 
",argv[0]);
20         exit(1);
21     }
22     if(NULL == (read_fp = fopen(argv[1],"r")))
23     {
24         perror("malloc");
25         exit(1);
26     }
27     if(NULL == (write_fp = fopen(argv[2],"w")))
28     {
29         perror("malloc");
30         exit(1);
31     }
32 
33     while(EOF !=(tmp= fgetc(read_fp)))//copy file
34     {
35         fputc(tmp,write_fp);//paste file
36     }
37 
38     fclose(read_fp);
39     fclose(write_fp);
40 
41 
42     return 0;
43 }

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