windows read write 高级应用 文件复制

C语言 文件复制

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1. #include <sys/types.h>
   
2. #include <signal.h>
   
3. #include <stdio.h>
   
4. #include <string.h>
   
5. #include <fcntl.h>
   
6. #include <errno.h>
   
7. #include <sys/stat.h>
   
8. 
   
9. #define BLKSIZE 255
   
10. int main(int argc, char *argv[])
    
11. {
    
12.     
    
13.     int fdr,fdw;
    
14.     int r_size;
    
15.     int iFlen;
    
16.     int iBlock = 0;
    
17.     char temp[255];
    
18.     char filepath[255];
    
19.     char fileto[255];
    
20.     
    
21.     struct stat stbuf;
    
22.     
    
23.     printf("please input the filepath:");
    
24.     
    
25.     //    scanf("%s",filepath);
    
26.     strcpy(filepath, argv[1]);
    
27.     //    fdr = open(argv[1], O_RDONLY|O_BINARY, S_IREAD);
    
28. //    fdr = _open(argv[1], O_BINARY);
    
29.     fdr = _open(argv[1], O_RDONLY | O_BINARY, S_IWRITE | S_IREAD);
    
30.     //    if((fdr=open(filepath,O_RDONLY))==-1)
    
31.     if( fdr==-1 )
    
32.     {
    
33.         printf("file not found,open failed!");
    
34.         return -1;
    
35.     }
    
36.     else
    
37.     {
    
38.         
    
39.         //        iFlen = lseek( fdr, 0L, SEEK_END );
    
40.         stbuf.st_size = 0 ;
    
41.         stat(filepath,&stbuf);
    
42.         iFlen = stbuf.st_size;
    
43.         iBlock = BLKSIZE;
    
44.         fdw = _open(argv[2], O_WRONLY|O_CREAT|O_BINARY , 0777);
    
45.         //        fdw = open(argv[2], O_RDONLY|O_BINARY, S_IREAD);
    
46.         for(;;)
    
47.         {
    
48.             if(iFlen >BLKSIZE)
    
49.                 iBlock = BLKSIZE;
    
50.             else
    
51.                 iBlock = iFlen ;
    
52.             memset(temp, 0x00, sizeof(temp));
    
53.             r_size=_read(fdr,temp,iBlock);
    
54.             if(r_size != iBlock)
    
55.             {
    
56.                 printf("读数据失败!!!!!!!!!!!![%d, %s]\n", errno, strerror(errno));
    
57.                 printf("%d, %d\n", r_size , iBlock);
    
58.                 close(fdr);
    
59.                 break;
    
60.             }
    
61.             _write(fdw, temp,iBlock);
    
62.             iFlen -=BLKSIZE;
    
63.             if(iFlen <= 0 )
    
64.             {
    
65.                 printf("完成读取文件!!!!\n");
    
66.                 break;
    
67.             }    
    
68.         }
    
69.         close(fdw);
    
70.         close(fdr);
    
71.         printf("\n");
    
72.         printf("uuuuuuuuuu,[%d,%s\n", iFlen, temp);
    
73.         /*
    
74.         while(r_size=read(fdr,temp,255) > 0)
    
75.         {
    
76.         printf("uuuuuuuuuu,%s\n", temp);
    
77.         }
    
78.         close(fdr);
    
79.         sprintf(fileto,"file-rw.txt");
    
80.         if((fdw=open(fileto,O_WRONLY|O_CREAT,0640))==-1)
    
81.         {
    
82.         printf("open failed!");
    
83.         return -1;
    
84.         }
    
85.         else
    
86.         {
    
87.         int w_size=write(fdw,temp,r_size);//相当于复制了所输入文件.txt中的255个大小的字符串到新文件file-rw.txt中
    
88.         close(fdw);
    
89.         printf("have successfully copied 255 chars from \"%s\" to \"%s\"\n",filepath,fileto);
    
90.         }
    
91.         */
    
92.         
    
93.     }
    
94.     
    
95.     return 0;
    
96.     
    
97. }