贴一段读写文件的小代码fopen fread fwrite

#include

#define BUFFER_LENGTH 10
#define FILE_LENGTH 1000/BUFFER_LENGTH

void main()
{
 FILE *fp_r, *fp_w;
 const char *read_name = "pcm.wav";
 const char *wright_name = "haha.wav";
 unsigned char read_byte[BUFFER_LENGTH];
 unsigned char wright_byte[BUFFER_LENGTH * 4];
 fp_r = fopen(read_name, "r");
 if (fp_r == NULL)
 {
  printf("open file pcm.wav err");
 }
 fp_w = fopen(wright_name, "wb");
 if (fp_w == NULL)
 {
  printf("open file haha.wav err");
 }
 for (int i = 0; i < FILE_LENGTH ; i++)
 {
  fread(read_byte, BUFFER_LENGTH, 1, fp_r);
  for (int j = 0 ; j < BUFFER_LENGTH; j++)
  {
   wright_byte[j*4] = read_byte[j];
   wright_byte[j*4 + 1] = read_byte[j];
   wright_byte[j*4 + 2] = read_byte[j];
   wright_byte[j*4 + 3] = read_byte[j];
  }
  fwrite(wright_byte, BUFFER_LENGTH*4, 1, fp_w);
 }

 fclose(fp_r);
 fclose(fp_w);
}