bintro.c

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#ifndef BROWSEINTRO
 #define BROWSEINTRO
 #include "stdio.h"
 #include "shead.h"
 #include "malloc.h"
 void BrowseIntro()
 {
  int i,j,k;
  candidate TempS;
  int total=CANDIDATENUM;/*存放的是当前s的大小*/
  candidate *t=NULL,*s=NULL;
  int recNumber=0;
  char DataFile[10]="houshuan";
  FILE * fp=NULL;
  s=(candidate *)malloc(sizeof(candidate)*CANDIDATENUM);/* houshuan 在shead.h头文件中定义的常量值为20 */
  if(s==NULL)
  {
   printf("allot memory fail!");
   printf("press any key to continu...");
   getch();
   return;
  }

  fp=fopen(DataFile,"rb");
  clrscr();
  if(fp==NULL)
  {
   printf("\nfp=%ld\n",fp);
   printf("\nOpen file %s fail!End with any key\n",DataFile);
   perror("Open file fail");
   getch();
   free(s);/*释放内存*/
   exit(1);
  }
  /* 将文件中要排序的信息存入结构体数组 */
  while((fread(&TempS,sizeof(candidate),1,fp)!=(int)NULL))
  {
   s[recNumber].Number=TempS.Number;
   strcpy(s[recNumber].Name,TempS.Name);
   strcpy(s[recNumber].intro,TempS.intro);
   s[recNumber].votenum=TempS.votenum;
   recNumber++;

   if(recNumber>=total)/*当s被用完时重新分配大小*/
   {
    total+=INCREASE;/*INCREAT在shead头文件中定义*/
    t=(candidate *)realloc(s,sizeof(candidate)*total);
    if(t==NULL)
    {
      printf("allot memory fail!");
      printf("press any key to continu...");
      free(s);
      fflush(stdin);
      getch();
      return;
    }
    s=t;
    t=NULL;
   }

  }
  fclose(fp);
  /* 如果文件中有记录，则将各条记录按序号排序 */
  if(recNumber>1)
  {
   for(i=0;i<recNumber-1;i++)
   {
    k=i;
    for(j=i+1;j<recNumber;j++)
    {
     if(s[k].Number>s[j].Number) k=j;
    }
    if(k!=i)
    {
        TempS.Number=s[k].Number;
       strcpy(TempS.Name,s[k].Name);
       strcpy(TempS.intro,s[k].intro);
       TempS.votenum=s[k].votenum;

        s[k].Number=s[i].Number;                           
        strcpy(s[k].Name,s[i].Name);
        strcpy(s[k].intro,s[i].intro);
        s[k].votenum=s[i].votenum;

       s[i].Number=TempS.Number;
        strcpy(s[i].Name,TempS.Name);
        strcpy(s[i].intro,TempS.intro);
        s[i].votenum=TempS.votenum;
    }
   }
   /* 将排序好的结构体记录写入文件 */
   fp=fopen(DataFile,"wb+");
   if(fp==NULL)
   {
    printf("\nSet up file %s fail!End with anykey.\n",DataFile);
    perror("Set up fail");
    getch();
    free(s);/*释放内存*/
    exit(1);
   }
   for(i=0;i<recNumber;i++)
   {
    if(fwrite(&s[i],sizeof(candidate),1,fp)!=1)
    {
     printf("\nwrite file %s fail!End with anykey.\n",DataFile);
     perror("Write file fail!");
     getch();
     free(s);/*释放内存*/
     exit(1);
    }
   }
   fclose(fp);
  }
  else if(recNumber<1)
  {
   printf("\nNo cnadidate\n");
   printf("press any key to continu...");
   getch();
   free(s);/*释放内存*/
   return;
  }
  /* 显示排序后的文件 */
  printf("The content in the user file is :\n",DataFile);
  printf("Content as follow:\n");
  fp=fopen(DataFile,"rb");

  if(fp==NULL)
  {
   printf("\nOpen file %s fail!End with any key\n",DataFile);
   perror("Open file fail");
   getch();
   free(s);/*释放内存*/
   exit(1);
  }
  while(fread(&TempS,sizeof(candidate),1,fp)!=(int)NULL)
  {
   printf("\nNumber:%ld\tName:%s\nintro:%s\nvote:%d\n\n",TempS.Number,TempS.Name,TempS.intro,TempS.votenum);
   printf("press any key to next...\n");
   fflush(stdin);
   getch();
  }
  fclose(fp);
  free(s);/*释放内存*/
 }
#endif