c - 重命名功能在C中不起作用

我创建了一个更新文件值然后重命名的函数。
我的代码：

void UpdateBooks()
{
system("CLS");
char *update[5] = {malloc(30),malloc(30),malloc(30),malloc(30),malloc(30)};
int coop = 0;
struct Books book;
char oldfn[] = "d:/booksdata.txt";
char newfn[] = "d:/booksdata_temp.txt";
int deletecheck = 0;
char *myisbnumber = malloc(4);
char line[256];
char * pch;
int countcheck = 0;
allocatebooks(&book);
fp = fopen(oldfn,"r");
fpa = fopen(newfn,"w+");
if (fp == NULL || fpa == NULL)
{
    printf("Error opening file!\n");
    exit(1);
}
printf("Enter ISBN Number Of The Book You Want To Update:\n");
scanf("%10s",myisbnumber);

while (fgets(line,sizeof line,fp) != NULL)
{
    pch = strtok (line,",");
    while (pch != NULL)
    {
    if(countcheck == 0)
        book.name = pch;
    else if(countcheck == 1)
        book.author = pch;
    else if(countcheck == 2)
        book.bookserialnumber = pch;
    else if(countcheck == 3)
        book.isbnnumber = pch;
    else if(countcheck == 4)
        book.edition = pch;
    else if(countcheck == 5)
        book.is_reserved = pch;
    pch = strtok (NULL, ",");
    countcheck++;
    }
    if(strcmp(myisbnumber,book.isbnnumber) != 0)
    {
        fprintf(fpa,"%s,%s,%s,%s,%s,%s,\n",book.name,book.author,book.bookserialnumber,book.isbnnumber,book.edition,book.is_reserved);
    }
    else
    {
        deletecheck++;
        RedoUpdate:
        system("CLS");
        coop = 0;
        printf("What do you want to Update:\n");
        printf("1.Name\t  %s\n2.Author\t  %s\n3.Serial Number\t  %s\n4.Edition\t  %s\n5.Is_Reserved\t  %s\n6.Nothing to Update\n",book.name,book.author,book.bookserialnumber,book.edition,book.is_reserved);
        scanf("%d",&coop);
        if(coop > 0 && coop <= 5)
        {
            printf("Enter New Value\n");
            scanf("%s",update[coop]);
            if(coop == 1)
                book.name = update[coop];
            else if(coop == 2)
                book.author = update[coop];
            else if(coop == 3)
                book.bookserialnumber = update[coop];
            else if(coop == 4)
                book.edition = update[coop];
            else if(coop == 5)
                book.is_reserved = update[coop];
            goto RedoUpdate;
        }
        fprintf(fpa,"%s,%s,%s,%s,%s,%s,\n",book.name,book.author,book.bookserialnumber,book.isbnnumber,book.edition,book.is_reserved);
        printf("Updated!\n");
    }
    countcheck = 0;
}
if(deletecheck == 0)
    goto END;
if(fclose(fp) != 0)
    perror("File Not Closed FP\n");
if(fclose(fpa) != 0)
    perror("File Not Closed FPA\n");
if(remove(oldfn) == -1)
{
    perror("Remove Error");
    exit(1);
}
if(rename(newfn,oldfn) == -1)
{
    perror("Rename Error");
    exit(1);
}
printf("Completed!\n");
END:
getch();
}

整个代码正常工作。我也使用fclose关闭文件，但是当我尝试重命名它时，出现“权限被拒绝”错误。
当使用rename（newfn，oldfn）时，我得到：权限被拒绝错误

最佳答案

从ISO / IEC9899：


  7.19.4.2重命名功能
  
  概要
  
  1 #include <stdio.h>
  
  int rename(const char *old, const char *new);


从原型可以看到：您在错误的位置使用了新旧参数。

关于c - 重命名功能在C中不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27253015/