【C/C++】标准IO操作-白红宇

【C/C++】标准IO操作

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发布时间：2019-06-21

本文共 2810 字，大约阅读时间需要 9 分钟。

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 
      
        7 #include 
       
         8 #include 
        
          9 10 #define BUFSIZE 10011 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 
          
          
            \n",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 
      
        9 #include 
       
        10 11 #define MAXSIZE 102412 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 
         
         
           \n",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'\n'绠楀湪缂撳啿鍖轰腑35     {36         fputs(buf,write_fp);//paste file37     }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 
      
        9 #include 
       
        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 
         
         
           \n",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 file34     {35         fputc(tmp,write_fp);//paste file36     }37 38     fclose(read_fp);39     fclose(write_fp);40 41 42     return 0;43 }