C语言相关文件操作

1.对已知文件进行分割。

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <stdlib.h>
 4 FILE *in,*out;
 5 char filename[256],ch,cfilename[256];
 6 void depart()
 7 {
 8  char ext[6][6]={
 9  "a.txt",
10  "b.txt",
11  "c.txt",
12  "d.txt",
13  "e.txt",
14  "f.txt"};
15  unsigned long int n=1,k,byte=0;
16  unsigned int j=0,i=0;
17  printf("input filename:\n");
18  scanf("%s",filename);
19  strcpy(cfilename,filename);
20  if((in=fopen(filename,"r")) == NULL)
21  {
22   exit(0);
23  }
24  printf("file size:\n");
25  scanf("%d",&n);
26  n = n*1024;
27  while(filename[j] != '.')
28  {
29   j++;
30  }
31  filename[j] = '\0';
32  if((out=fopen(strcat(filename,ext[i]),"w")) == NULL)
33  {
34   exit(0);
35  }
36  
37  fseek(in,0,2);
38  k = ftell(in);
39  fseek(in,0,0);
40  while(k>0)
41  {
42   ch = fgetc(in);
43   fputc(ch,out);
44   byte++;
45   k--;
46   if(byte == n)
47   {
48    fclose(out);
49    byte = 0;
50    strcpy(filename,cfilename);
51    while(filename[j] != '.')
52    {
53     j++;
54    }
55    filename[j]='\0';
56    i++;
57    if((out=fopen(strcat(filename,ext[i]),"w")) == NULL)
58    {
59     exit(0);
60    }
61   }
62  }
63  
64  fclose(in);
65  printf("depart success!\n");
66 }
67 int main()
68 {
69  depart();
70  return 0;
71 }

2.操作临时文件，新建文件（tcc编译器）

 1 #include <stdio.h>
 2 #include <io.h>
 3 int main()
 4 {
 5  /*临时文件的使用方法*/
 6  FILE *temp;
 7  char c;
 8  if((temp=tmpfile()) != NULL)
 9  {
10   fputs("\nhello\nworld",temp);
11  }
12  rewind(temp);//文件指针返回文件头
13  while((c = fgetc(temp)) != EOF)
14  {
15   printf("%c",c);
16  }
17  fclose(temp);
18  /*新建文件的方法*/
19  int handle;
20  char filename[256];
21  printf("input filename:\n");
22  scanf("%s",filename);
23  if((handle = creat(filename,0)) == -1)
24  {//tcc中io.h文件中的creat函数，新建文件。
25   printf("error!");
26  }
27  else
28  {
29   printf("Success");
30   close(handle);
31  }
32 }

本文就写这几个功能，其他再续……

posted @ 2013-01-15 20:52  alexander.bruce.lee  阅读(220)  评论(0)    收藏  举报