读取C语言struct生成的数据文件

时间：2007-10-23 来源：jcodeer

Python代码，读取tostruct.dat中的结构体数据，并以tuple的形式打印出来

# -*- coding: cp936 -*-
'''读取C语言struct生成数据文件'''
import struct
import cStringIO
'''
步距长度计算，查看C语言字节对齐内容
typedef struct _CToStruct
{
    char    c;
    short    h;
    int        i;
}CToSturct;
sizeof(c) = 1
pad = 1
sizeof(h) = 2
sizeof(i) = 4
struct_size = 8
'''
struct_size = 8
fp = file("c:\\tostruct.dat","rb")
import os
import mmap
# 一次性将全部数据读入内存
data = fp.read()
for i in range(0,os.path.getsize("C:\\tostruct.dat"),8):
    # 每次移动8个字节
    print struct.unpack('Bhi',data[i:i+8])
fp.close()

C语言生成以结构体为单元的数据文件。

#include <stdio.h>
typedef struct _CToStruct
{
    char    c;
    short    h;
    int        i;
}CToSturct;
#define TS_SIZE (5)
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int writeToFile(void* pData,unsigned int size)
{
    FILE* fp = fopen("c:\\tostruct.dat","wb");
    if(fp == NULL)
        return 0;
    fwrite(pData,1,size,fp);
    fclose(fp);
    return 1;
}
int main(int argc, char* argv[])
{
    int i = 0;
    CToSturct ts[TS_SIZE] = {0};
    for(;i < TS_SIZE;i++)
    {
        ts[i].c = (char)i;
        ts[i].h = (short)i * i;
        ts[i].i = i* i * i;
    }

    writeToFile(ts,sizeof(ts));

    return 0;
}