從 C 中的二進制文件讀取數據

Question

我是 C 新手，試圖將一些數據寫入二進制文件並從中讀取。 有字符數組和整數作為結構的成員。 當我運行我的代碼並通過記事本打開二進制文件時，我只能看到程序正在讀取字符串。 這是我的代碼：

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

typedef struct{
    unsigned int sample_offset;
    char receiver_name[20];
    double sample_rate;
    unsigned int channel;
    unsigned int bits;
    char file_type[11];
    unsigned int freq_band;
    double channel_bandwidth;
    double firmwire_version;
    double header_version;
}sampleInfo;

int main(){
    // Writing into the file
    FILE * fw;
    sampleInfo data = {64, "Gadfly", 51.2, 2, 4, "Spreadsheet", 1,24, 1.0,1.0 }, read_data;

    fw = fopen("test.bin","wb"); 
    if (!fw)
    {
        printf("Unable to open the file\n");
        exit(1);
    }
    else{
        fprintf(fw,"Sample offset: %u bytes\n\n", data.sample_offset)
        fprintf(fw,"Receiver's name: %s\n\n", data.receiver_name);
        fprintf(fw,"Sample rate: %.2lf Mega-samples per second\n\n", data.sample_rate);
        fprintf(fw,"Number of channels used: %u\n\n", data.channel);
        fprintf(fw,"Number of bits per I and Q sample: %u\n\n", data.bits);
        fprintf(fw,"File type: %s\n\n", data.file_type);
        fprintf(fw,"Frequency band per channel: L%u\n\n",data.freq_band);
        fprintf(fw,"Channel Bandwidth: %.1lfMHz\n\n", data.channel_bandwidth);
        fprintf(fw,"Firm-wire version: %.1lf\n\n",data.firmwire_version);
        fprintf(fw,"Header version: %.1lf\n\n",data.header_version);
    }
    fwrite(&data,sizeof(sampleInfo),1, fw); 
    fclose (fw); 

    // Reading from the file
    FILE * fr;
    fr = fopen("test.bin", "rb"); 
    if (! fr){
        printf("Unable to open the file\n");
        exit(1);
    }
    else
    {
        fread(&read_data,sizeof(sampleInfo),1, fr); 
        fscanf(fr,"Sample offset: %u bytes\n", &(read_data.sample_offset));
        fscanf(fr,"Receiver's name: %s\n", read_data.receiver_name);
        fscanf(fr,"Sample rate: %lf Mega-samples per second\n", &(read_data.sample_rate));
        fscanf(fr,"Number of channels used: %u\n", &(read_data.channel));
        fscanf(fr,"Number of bits per I and Q sample: %u\n",&(read_data.bits));
        fscanf(fr,"File type: %s\n", read_data.file_type);
        fscanf(fr,"Frequency band per channel: L%u\n", &(read_data.freq_band));
        fscanf(fr,"Channel Bandwidth: %lf MHz\n", &(read_data.channel_bandwidth));
        fscanf(fr,"Firm-wire version: %lf\n", &(read_data.firmwire_version));
        fscanf(fr,"Header version: %lf\n\n\n", &(read_data.header_version));
    }
    fclose(fr); 
    return 0;
}

這就是我得到的輸出：

輸出

我不明白為什么程序只顯示打印語句作為輸出，而不是正確讀取文件中的所有數據。 我也嘗試在 else 語句之外使用 fread() 函數並得到相同的結果。

有什么建議？

Answer 1

您在人類可讀版本之后以二進制形式編寫數據結構，但是您首先讀取二進制數據結構，然后是人類可讀版本。 忽略您在文件中兩次寫入信息（人類可讀，然后是二進制）的事實，如果您以相同的順序寫入/讀取它應該可以工作。

這是一個“固定”版本：

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

typedef struct{
  unsigned int sample_offset;
  char receiver_name[20];
  double sample_rate;
  unsigned int channel;
  unsigned int bits;
  char file_type[11];
  unsigned int freq_band;
  double channlel_bandwidth;
  double firmwire_version;
  double header_version;
} sampleInfo;

int main(){
  // Writing into the file                                                                                                                                                                                          
  FILE * fw;
  sampleInfo data = {64, "Gadfly", 51.2, 2, 4, "Spreadsheet", 1,24, 1.0,1.0 };
  sampleInfo read_data;

  fw = fopen("test.bin","wb");
  if (!fw)
    {
      printf("Unable to open the file\n");
      exit(1);
    }
  else
    {
      fprintf(fw,"Sample offset: %u bytes\n\n", data.sample_offset);
      fprintf(fw,"Receiver's name: %s\n\n", data.receiver_name);
      fprintf(fw,"Sample rate: %.2lf Mega-samples per second\n\n", data.sample_rate);
      fprintf(fw,"Number of channels used: %u\n\n", data.channel);
      fprintf(fw,"Number of bits per I and Q sample: %u\n\n", data.bits);
      fprintf(fw,"File type: %s\n\n", data.file_type);
      fprintf(fw,"Frequency band per channel: L%u\n\n",data.freq_band);
      fprintf(fw,"Channel Bandwidth: %.1lfMHz\n\n", data.channlel_bandwidth);
      fprintf(fw,"Firm-wire version: %.1lf\n\n",data.firmwire_version);
      fprintf(fw,"Header version: %.1lf\n\n",data.header_version);
      fwrite(&data,sizeof(sampleInfo),1, fw);
      fclose (fw);
    }

  // Reading from the file                                                                                                                                                                                          
  FILE * fr;
  fr = fopen("test.bin", "rb");
  if (!fr)
    {
      printf("Unable to open the file\n");
      exit(1);
    }
  else
    {
      fscanf(fr,"Sample offset: %u bytes\n\n",&(read_data.sample_offset));
      fscanf(fr,"Receiver's name: %s\n\n", read_data.receiver_name);
      fscanf(fr,"Sample rate: %lf Mega-samples per second\n\n", &(read_data.sample_rate));
      fscanf(fr,"Number of channels used: %u\n\n", &(read_data.channel));
      fscanf(fr,"Number of bits per I and Q sample: %u\n\n",&(read_data.bits));
      fscanf(fr,"File type: %s\n\n", read_data.file_type);
      fscanf(fr,"Frequency band per channel: L%u\n\n", &(read_data.freq_band));
      fscanf(fr,"Channel Bandwidth: %lf MHz\n\n", &(read_data.channlel_bandwidth));
      fscanf(fr,"Firm-wire version: %lf\n\n", &(read_data.firmwire_version));
      fscanf(fr,"Header version: %lf\n\n", &(read_data.header_version));
      fread(&read_data,sizeof(sampleInfo),1, fr);
      fclose(fr);
    }
  return 0;
}

為了提高效率，去掉 fprintf/fscanf 行，只保留緊湊的二進制版本。 在記事本中打開文件並驗證它不是人類可讀的。 這是優化的二進制版本：

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

typedef struct{
  unsigned int sample_offset;
  char receiver_name[20];
  double sample_rate;
  unsigned int channel;
  unsigned int bits;
  char file_type[11];
  unsigned int freq_band;
  double channlel_bandwidth;
  double firmwire_version;
  double header_version;
} sampleInfo;

int main(){
  // Writing into the file                                                                                                                                                                                          
  FILE * fw;
  sampleInfo data = {64, "Gadfly", 51.2, 2, 4, "Spreadsheet", 1,24, 1.0,1.0 };
  sampleInfo read_data;

  fw = fopen("test.bin","wb");
  if (!fw)
    {
      printf("Unable to open the file\n");
      exit(1);
    }
  else
    {
      fwrite(&data,sizeof(sampleInfo),1, fw);
      fclose (fw);
    }

  // Reading from the file                                                                                                                                                                                          
  FILE * fr;
  fr = fopen("test.bin", "rb");
  if (!fr)
    {
      printf("Unable to open the file\n");
      exit(1);
    }
  else
    {
      fread(&read_data,sizeof(sampleInfo),1, fr);
      printf("Sample offset: %u bytes\n\n", read_data.sample_offset);
      printf("Receiver's name: %s\n\n", read_data.receiver_name);
      printf("Sample rate: %.2lf Mega-samples per second\n\n", read_data.sample_rate);
      printf("Number of channels used: %u\n\n", read_data.channel);
      printf("Number of bits per I and Q sample: %u\n\n", read_data.bits);
      printf("File type: %s\n\n", read_data.file_type);
      printf("Frequency band per channel: L%u\n\n", read_data.freq_band);
      printf("Channel Bandwidth: %.1lfMHz\n\n", read_data.channlel_bandwidth);
      printf("Firm-wire version: %.1lf\n\n", read_data.firmwire_version);
      printf("Header version: %.1lf\n\n", read_data.header_version);
      fclose(fr);
    }
  return 0;
}