void save_records() { FILE *fp; fp = fopen("records.dat", "wb"); if (fp == NULL) { printf("Failed to open file!\n"); return; } fwrite(records, sizeof(struct Employee), num_records, fp); fclose(fp); printf("Records have been saved to file successfully!\n"); } 解决一下这段代码保存后打开查看是乱码的问题

这个问题可能是因为写入文件时使用了二进制模式，但是读取文件时却没有使用二进制模式。建议在读取文件时也使用二进制模式打开文件，例如：

void load_records() {
    FILE *fp;
    fp = fopen("records.dat", "rb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }
    fread(records, sizeof(struct Employee), num_records, fp);
    fclose(fp);
    printf("Records have been loaded from file successfully!\n");
}

另外，如果你在写入文件时使用了结构体，建议在读取文件时也使用相同的结构体来读取。这样可以保证读取的数据与写入的数据类型一致。

相关问题

void save_records() { FILE *fp; fp = fopen("records.dat", "rb"); if (fp == NULL) { printf("Failed to open file!\n"); return; } fwrite(records, sizeof(struct Employee), num_records, fp); fclose(fp); printf("Records have been saved to file successfully!\n"); } void load_records() { FILE *fp; fp = fopen("records.dat", "rb"); if (fp == NULL) { printf("Failed to open file!\n"); return; } 解决c语言项目保存打开后乱码的问题

在函数save_records()中，文件打开模式应该为"wb" (写入二进制)，而不是"rb" (读取二进制)。修改代码如下：

void save_records() {
    FILE *fp;
    fp = fopen("records.dat", "wb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }
    fwrite(records, sizeof(struct Employee), num_records, fp);
    fclose(fp);
    printf("Records have been saved to file successfully!\n");
}

在函数load_records()中，同样应该使用"rb"模式打开文件。另外，在读取完数据后，需要检查读取的数据数量是否与实际数量相符。如果不相符，说明文件中的数据可能有误。修改代码如下：

void load_records() {
    FILE *fp;
    fp = fopen("records.dat", "rb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }

    // 读取数据到sorted_records数组中
    int num_read = fread(sorted_records, sizeof(struct Employee), MAX_RECORDS, fp);
    if (num_read != num_records) {
        printf("Error: The number of records read from file is not consistent with the actual number of records!\n");
        fclose(fp);
        return;
    }

    fclose(fp);
    printf("Records have been loaded from file successfully!\n");
}

另外，还需要注意一下读取和写入的顺序需要一致。如果读取时使用了"rb"模式，那么保存时也应该使用"rb"模式。同理，如果读取时使用了"r"模式，那么保存时也应该使用"w"模式。

使用全局顺序表结构解决void save_records() { FILE *fp; fp = fopen("records.dat", "wb"); if (fp == NULL) { printf("Failed to open file!\n"); return; } fwrite(records, sizeof(struct Employee), num_records, fp); fclose(fp); printf("Records have been saved to file successfully!\n"); } 这段代码保存后打开查看是乱码的问题

如果要使用全局顺序表结构来解决这个问题，可以将结构体数组 `records` 定义为全局变量，并在保存和读取数据时使用该全局变量。具体代码如下：

#include <stdio.h>
#include <stdlib.h>

#define MAX_RECORDS 100

struct Employee {
    int id;
    char name[20];
    int age;
};

struct Employee records[MAX_RECORDS];
int num_records = 0;

void save_records() {
    FILE *fp;
    fp = fopen("records.dat", "wb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }
    fwrite(records, sizeof(struct Employee), num_records, fp);
    fclose(fp);
    printf("Records have been saved to file successfully!\n");
}

void load_records() {
    FILE *fp;
    fp = fopen("records.dat", "rb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }
    num_records = fread(records, sizeof(struct Employee), MAX_RECORDS, fp);
    fclose(fp);
    printf("Records have been loaded from file successfully!\n");
}

int main() {
    // 其他代码
    return 0;
}

在这个代码中，我们将结构体数组 `records` 和记录数 `num_records` 定义为全局变量，可以在 `save_records` 和 `load_records` 函数中直接使用这些全局变量来保存和读取数据。