我正在使用Dev-C ++ IDE,现在我正在尝试进行文件处理。这是我的代码:

int main(){
     FILE *fp;
     int b = 10;
     int f;
      fp = fopen("data.txt", "w");
      //checking if the file exist
      if(fp == NULL){
        printf("File does not exist,please check!\n");
      }else{
      printf("we are connected to the file!\n");
      }
      fprintf (fp, " %d ", b) ;
      fclose(fp);
      printf("Reading from the file \n");

      FILE *fr;
      fr=fopen("data.txt","r");
      fscanf (fr, " %d ", &f) ;
      fclose(fr);
      printf("the data from the file %d \n", f);
    return 0;

}


这段代码在NetBeans中有效,但是在Dev-C ++中,我只是得到“我们已连接到文件”的消息,但没有将“ 10”的值放入文件中。请您知道答案,让我知道,我该怎么办?

最佳答案

我看不到您的代码有什么问题,但是这里有一些提示

一个好习惯是创建函数并调用这些函数,而不是使用所有内联函数,例如

#define FILENAME "data.txt"

void writeFile()
{
     FILE *fp;
     int b = 10;
      fp = fopen(FILENAME, "w");
      //checking if the file exist
      if (fp == NULL)
      {
        perror("File could not be opened for writing\n");
      }
      else
      {
        printf("File created\n");
      }
      fprintf (fp, " %d ", b) ;
      fclose(fp);
}

void readFile()
{
     int f;
     printf("Reading from the file \n");

     FILE *fr;
     fr=fopen(FILENAME,"r");
     fscanf (fr, " %d ", &f) ;
     fclose(fr);
     printf("the data from the file %d \n", f);
}

int main()
{
  writeFile();
  readFile();
}


然后从文件读取时,我建议您改用fgets
因为fscanf有导致内存覆盖的趋势,所以使用起来更安全
如果值是意外的。

<- fscanf(fp," %d ", &f );

-> char buf[16]; // some buffer
-> fgets( fp, buf, 10 ); // read as string
-> f = atoi(buf); // convert to int

关于c - Dev-C++文件处理,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/4232295/

10-11 23:22
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