删除文件中的错误(c编程)

Question

我有一个程序，它的目的是创建一个员工文件，然后用户可以从创建的文件中删除、更新或检索记录，我遇到的问题是，当用户输入2以删除记录并且该记录被删除功能删除时(该功能传输除3之外的所有记录，但它一直给出这样的错误"打开文件时出错"我相信这是因为文件在执行删除功能后被删除，有人能指导我或告诉我我的代码出了什么问题吗

这是我的代码：

#include <stdio.h>
#include <string.h>
#define KEY_SIZE 100
typedef struct employee{
  int id;
  char name[40];
  float pay;
}EMP;
void CreateEmployee();
void DisplayRecord();
void DeleteRecord(int );
void menuEmployee();
void StoreTemp(struct employee data[],FILE *fp,int ,int );
int main() {
    menuEmployee();
    return 0;
}

 void menuEmployee(){
    int choice=0;
    printf("      Please select an Optionn");
    puts("");
    printf("t1:Create Employeen");
    printf("t2:Delete Employeen");
    printf("t3:Update Employeen");
    printf("t4:Retrieve Employeen");
    printf("t5:Display Employeen");
    puts("");
    printf("t    6:Exitnt      ");
    scanf("%d",&choice);
     switch((choice-1)){
      case 0:
        CreateEmployee();
        break;
      case 1:
        DeleteRecord(3);
        DisplayRecord();
        break;
      case 2:
        //UpdateEmployee();
        break;
      case 3:
        //RetrieveEmployee();
        break;
      case 4:
        DisplayRecord();
        break;
      case 5:
        exit(0);
      default:
        printf("No such option Exist");
        break;
   }
 }

void DeleteRecord(int id){
   EMP test[KEY_SIZE];
   FILE *fp;
   FILE *tfp;
   int length;
   int i =0;
   fp=fopen("employee.txt","r");
   tfp=fopen("temp.txt","a");
   if(fp != NULL){
    length=ReadContents(test,fp,id);
    length=length-1;
   }
   StoreTemp(test,tfp,length,id);
   fclose(fp);
   remove("employee.txt");
   rename("temp.txt","employee.txt");
   fclose(tfp);
 }
int ReadContents(struct employee test[],FILE *fp,int id)
{
   int count=0;
   int i;
   while(!feof(fp)){
    fscanf(fp,"%i %s %f",&test[count].id,test[count].name,&test[count].pay);
    count++;
  }

  return count;
 }
void CreateEmployee(){
   char choice ='y';
   int i=0;
   long int pos;
   EMP x[20];

   FILE *fp;
   FILE *keyfp;
   fp = fopen("employee.txt","a");
   keyfp =fopen("Key.txt","a");
   if (fp==NULL){
     printf("File not created");
   }
   while((choice == 'Y') || (choice =='y')){
     printf("Enter the employee's id:");
     scanf("%i",&x[i].id);
     fprintf(fp,"%it",x[i].id);
     printf("nEnter the employee's name:");
     scanf("%s",x[i].name);
     fprintf(fp,"%st",x[i].name);
     printf("nEnter the employee's pay:");
     scanf("%f",&x[i].pay);
     fprintf(fp,"%.2ftn",x[i].pay);
     printf("nEnter another employee?n");
     printf("Y - Yes     N - No:n");
     scanf("n%c",&choice);
     i++;
  }
  fclose(fp);
  fclose(keyfp);
  menuEmployee();
}

void StoreTemp(struct employee data[],FILE *fp,int length,int id){
   int i=0;
   for(i=0;i<length;i++){
    if(data[i].id != id){
        fprintf(fp,"%it%st%.2fn",data[i].id,data[i].name,data[i].pay);
      }
   }
 }

void DisplayRecord(){
   EMP temp;
   FILE *fp = fopen("employee.txt", "r");
   if(fp != NULL)
  {
     printf("IDtNAMEtSALARYn");
     while(1)
      {
         fscanf(fp, "%i %s  %f", &temp.id, temp.name, &temp.pay);
         if (feof(fp))
            break;
         printf("%it%st%.2fn",temp.id, temp.name, temp.pay);
      }
       fclose(fp);
     }
     else
     {
       printf("An error occurred opening the filen");
     }
  }

Answer 1

您正在尝试重命名一个仍然打开的文件。交换这两条线路：

   rename("temp.txt","employee.txt");
   fclose(tfp);

对此：

   fclose(tfp);
   rename("temp.txt","employee.txt");