c - 将文本写入多个c文件中的单个文本文件

Question

我在多个文件中定义了函数。我想根据它们的执行情况将一些文本写入同一个文件，如下所示。我找到了在不同文件中编写执行流程的方法，如下所示。

function1.h

#ifndef FUNCTION1_H_INCLUDED
#define FUNCTIONS_H_INCLUDED

int Sum(int a, int b);

#endif

function1.c

#include "function1.h"

int Sum(int a, int b)
{
    FILE *fp;

    fp = fopen("E:\\tmp\\test.txt", "a");
    fputs("Inside Sum function...\n", fp);
    fclose(fp);

    return a+b;
}

ma​​in.c

#include "stdio.h"
#include "function1.h"

int main() {
   int a=10, b=12;
   FILE *fp;

   fp = fopen("E:\\tmp\\test.txt", "a");
   fputs("Before Sum function...\n", fp);
   fclose(fp);

   printf("%d + %d = %d", a, b, Sum(a, b));

   fp = fopen("E:\\tmp\\test.txt", "a");
   fputs("After Sum function...\n", fp);
   fclose(fp);

}

当文件比较多时，上述方案很难处理。有没有直接的方法把test.txt写成多个*.c文件？

Answer 1

你可以打开一个文件并像参数一样传递它的描述符:

function1.h

#include <stdio.h>
#ifndef FUNCTION1_H_INCLUDED
#define FUNCTIONS_H_INCLUDED

int Sum(int a, int b, FILE *f);

#endif

function1.c

#include "function1.h"

int Sum(int a, int b, FILE *f)
{
    fputs("Inside Sum function...\n", f);
    return a+b;
}

ma​​in.c

#include "function1.h"

int main() {
   int a=10, b=12;
   FILE *fp;

   fp = fopen("E:\\tmp\\test.txt", "a");
   fputs("Before Sum function...\n", fp);

   printf("%d + %d = %d", a, b, Sum(a, b, fp));

   fputs("After Sum function...\n", fp);
   fclose(fp);

   return 0;
}