Question

我有一些模拟到数字转换器数据，它自动写在我想要读出的二进制文件中。在设备附带的使用说明书中，有一个示例C代码可以做到这一点，但我尝试使用它并且它不会编译。由于这是我第一次做这样的事情或第一次使用C，我需要一些帮助。

手册说：.CHN光谱数据文件包含32位整数的MCB的逐个通道内容。标头长度为32个字节。文件的下一部分包含存储为32位整数的频谱。文件中没有记录分隔符。频谱记录的数量由频谱中的信道数决定。给出的代码是：

/*Sample program compatible with Microsoft and Borland C*/
/* to read header and channel data from a .CHN data file. */
#include <stdio.h>

#define .CHN -1

main(argc, argv)
  int argc;
  char *argv[];
{
    char acq_time[32]; /* buffer for time, date*/
    int f_type; /*.CHN file type*/
    unsigned int chan_offset,/* beginning channel number*/
    count, /*loop counter*/
    mca_num, /*1-4 are valid*/
    num_chans, /* no. of data channels*/
    num_writ, /* no. of bytes written out*/
    segment; /* segment number*/
    long int livetime, /*20 ms tics of livetime*/
    realtime, /*20 ms tics of realtime*/
    chan_data; /*stores channel data*/
    FILE *f_pointer;

    if(argc!=2){
        printf("USAGE: readchn filename.chn\n");
        exit(1);
    }

    f_pointer = fopen(argv[1], "rb");

    /* Header Data*/
    /* output header info from .CHN file*/
    /* read filetype -1 (.CHN) */

    fread(&f_type, sizeof(int), 1, f_pointer);
    if(f_type != .CHN) {
        printf("Not a valid file \n");
        return -1;
    }

    fread(&mca_num, sizeof(int), 1, f_pointer); /*MCA number*/
    fread(&segment, sizeof(int), 1, f_pointer); /* segment #*/
    fread(acq_time+12, sizeof(char), 1, f_pointer);/*start time*/
    fread(&realtime, sizeof(long), 1, f_pointer);/*20ms ticks*/
    fread(&livetime, sizeof(long), 1, f_pointer);/*20ms ticks*/
    fread(acq_time, sizeof(char), 2, f_pointer);/*start date*/
    fread(acq_time+2, sizeof(char), 3, f_pointer);/*start month*/
    fread(acq_time+5, sizeof(char), 3, f_pointer);/*start year*/
    fread(acq_time+8, sizeof(char), 2, f_pointer);/*start hour*/
    fread(acq_time+10, sizeof(char), 2, f_pointer);/*start mins*/
    fread(&chan_offset, sizeof(int), 1, f_pointer); /*offset*/
    fread(&num_chans, sizeof(int), 1, f_pointer); /*#channels*/

    printf("TYPE = %4i MCA# %2i\n", f_type, mca_num);
    printf("SEGMENT # %3i\n", segment);
    printf("REALTIME = %10li seconds\n", realtime/50);
    printf("LIVETIME = %10li seconds\n", livetime/50);

    printf("DATA COLLECTED AT ");
    fwrite(acq_time+8, sizeof(char), 2, stdout);
    putchar(':');
    fwrite(acq_time+10, sizeof(char), 2, stdout);
    putchar(':');
    fwrite(acq_time+12, sizeof(char), 2, stdout);

    printf("ON");
    fwrite(acq_time, sizeof(char), 2, stdout);
    putchar('-');
    fwrite(acq_time+2, sizeof(char), 3, stdout);
    putchar('-');
    fwrite(acq_time+5, sizeof(char), 2, stdout);

    printf("\nSTARTING CHANNEL = %6in", chan_offset);
    printf("\nNUMBER OF CHANNELS = %6i\n\n", num_chans);

    /* Channel Data*/
    /* Output channel data from .CHN file*/

    printf("CHANNEL DATA\n");
    for(count = 0; count < num_chans; count++){
        if((count % 6) ==0)
            printf("n%7i", count);
            fread(&chan_data, sizeof(long), 1, f_pointer);
            printf("%11i", chan_data);
            }
    fcloseall();
}

给定的代码不会在XCode中编译。

鉴于文件结构，有没有办法从命令行查看文件（1和0）？我尝试使用

 xxd -b <filename>

但输出与文件描述看起来不一致，没有明显的标题。以下是输出的前几行：

0000000: 11111111 11111111 00000001 00000000 00000001 00000000  ......
0000006: 00110001 00110001 10111101 11011101 00110011 00000000  11..3.
000000c: 01100111 01000100 00101100 00000000 00110010 00110011  gD,.23
0000012: 01000110 01100101 01100010 00110001 00110111 00110001  Feb171
0000018: 00110001 00110110 00110101 00110000 00000000 00000000  1650..
000001e: 00000000 00001000 00000000 00000000 00000000 00000000  ......
0000024: 00000000 00000000 00000000 00000000 00000000 00000000  ......
000002a: 00000000 00000000 00000000 00000000 00000000 00000000  ......
0000030: 00000000 00000000 00000000 00000000 00000000 00000000  ......

非常感谢任何帮助！

读出二进制文件

0 个答案: