如何解码文件中的二进制文件

我用C30 v 3.31为PIC24FJ256GB206编码。现在我需要将一个配置结构保存到SDCard中，并且我想知道该结构实际上是如何组织的（我将其保存为二进制映像）。对于这种类型的变量，eof操作符报告的大小是42而不是40，并且得到的文件实际上也是42字节的长度。我已经通过将第一、第三和最后一个成员设置为某个非零值进行了测试，并且文件显示为十六进制内容：所以看起来在某个地方插入了一个额外的零，然后在末尾插入了一个。42，除了我原本期望它在文件中读为002A，但是现在它被列为2A00……我试图在将结构打包到内存中的方式上进行读取，并且我认为除非使用指令将结构设置为打包，否则成员将在大于1字节的一些边界上对齐，我没有做过。C30编译器有什么特殊的方法吗？我如何解码文件中的二进制文件呢？



      以下为原文

    I am coding for PIC24FJ256GB206 using C30 v 3.31.
Now I need to save a configuration struct to SDCard and I want to know how the struct is actually organized (I am saving it to file as a binary image).
Here is my struct, with my byte count at the end of each line:

typedef struct
{
    UINT8 HVOLT_Num;      // 1
    UINT8 I_code;         // 1
    int  Curr_num;        // 2
    int  meastime;        // 2
    int  INT_Time;        // 2
    int  DelayTime;       // 2
    UINT8 TempLimit ;     // 1
    UINT8 MaxHV;          // 1
    UINT8 Samples;        // 1
    UINT8 BATT;           // 1
    UINT8 Temperature1;   // 1
    UINT8 Temperature2;   // 1
    UINT8 R_sense;        // 1
    UINT8 Polarity;       // 1
    UINT8 BLEEDERflag;    // 1
    UINT32 ICNT;          // 4
    UINT32 OFFSETCNT;     // 4
    float TxCurrent;      // 4
    float Rfb;            // 4
    float CalVal;         // 4
    UINT8 AutoRangeFlag;  // 1
} SSTXSTATE;              //Sum=40

Now the strange thing is that the sizeof operator on a variable of this type reports size as 42 instead of 40 and the resulting file is actually also 42 bytes in length. I have tested by setting the first, 3rd and last members to some nonzero value and the file shows up with this hex content:

E7 00 2A 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 FF 00

So it seems like somewhere there is one extra zero inserted and then one at the end too.
Also the value I set for Curr_Num is the reported size of the struct variable, and 2A is 42, except I would have expected it to read as 00 2A in the file but now it is listed as 2A 00...
I have tried to read up on the way structs are packed in memory and I thought the members would be aligned on some boundaries bigger than 1 byte unless one used a directive to set the struct as packed, which I have not done.

Is there some special way for the C30 compiler to do this?
And how can I decode binaries like this in the file?