c - 文本到二进制数据库

Question

我需要帮助将文本文件转换为 C 的二进制文件。我无法继续我的程序，即使我已经编写了一半，因为我不知道是否正在打印任何值。转换需要最大、宽度、长度和人或动物的字符串。基本上我正在编写的程序读取二进制数据库文件并返回满足搜索的所有值。感谢您的帮助

#include <stdio.h>
#include <string.h>

typedef struct{
int max;
double length, width;
char people;
} max_t;

int 
main()
{
FILE *database;
int inp, out;

        database = fopen("database.txt", "r");
    fscanf(database, "Max : %d", &max);
    fscanf(database, "Width : %lf", &width);
    fscanf(database, "Length : %lf", &length);
    fscanf(database, "People : %s", &people);
    fwrite(&max, 1, sizeof(max), database);
    fwrite(&width, 1, sizeof(width), database);
    fwrite(&length, 1, sizeof(length), database);
    fwrite(&people, 1, sizeof(people), database);
        database = fopen("out.txt", "wb");

return(0);
}

Answer 1

你犯了一些愚蠢的错误。您没有在输出文件中写入任何内容，而是写入以“只读”模式打开的输入文件!

#include <stdio.h>
#include <string.h>

typedef struct s{
int max;
double length, width;
char people[10];
} max_t;

int main()
{
    FILE *database, *out;
    //int inp, out;
    max_t inp;
    database = fopen("database.txt", "r");
    out = fopen("out.txt", "wb");
    fscanf(database, "Max : %d", &inp.max);
    fscanf(database, "Width : %lf", &inp.width);
    fscanf(database, "Length : %lf", &inp.length);
    fscanf(database, "People : %s", inp.people);
    fwrite(&inp.max, 1, sizeof(inp.max), out);
    fwrite(&inp.width, 1, sizeof(inp.width), out);
    fwrite(&inp.length, 1, sizeof(inp.length), out);
    fwrite(inp.people, 1, sizeof(inp.people), out);    
    fclose(database);
    fclose(out);
    return(0);
}

编辑:查看 main() 和结构