dasomoli
1. About DasomOLI ¶
2. 내가 쓰거나 고치는 글 ¶
4. 의문의 코드 ¶이게 왜 의문의 코드지?;;
#include <stdio.h>
#pragma pack(push, 1) typedef struct Test1__t { struct { unsigned char Status; unsigned char Reserved; unsigned long Value; } Sensor[5]; } Test1_t; #pragma pack(pop) #pragma pack(push, 2) typedef struct Test2__t { struct { unsigned char Status; unsigned float Value; } Sensor[5]; } Test2_t; #pragma pack(pop) int main(void) { Test1_t Data1; Test2_t *pData; unsigned char Buffer[1000]; float *pf; int i = 0; Data1.Sensor[0].Status = 0; pf = (float*)&(Data1.Sensor[0].Value); *pf = 30.6; printf("[%d] pf : %f\n", i++, *pf); Data1.Sensor[1].Status = 0; pf = (float*)&(Data1.Sensor[1].Value); *pf = 27.0; printf("[%d] pf : %f\n", i++, *pf); Data1.Sensor[2].Status = 0; pf = (float*)&(Data1.Sensor[2].Value); *pf = 1012.9; printf("[%d] pf : %f\n", i++, *pf); Data1.Sensor[3].Status = 0; pf = (float*)&(Data1.Sensor[3].Value); *pf = 0.0; printf("[%d] pf : %f\n", i++, *pf); Data1.Sensor[4].Status = 0; pf = (float*)&(Data1.Sensor[4].Value); *pf = 17.3; printf("[%d] pf : %f\n", i++, *pf); for(i = 0; i < sizeof(Test1_t); i++) { Buffer[i] = ((unsigned char*)&Data1)[i]; } pData = (Test2_t*)&(Buffer[0]); printf("Buffer 에 담고 포인터로 접근\n"); for(i = 0; i < 5; i++) { printf("[%d] %f\n", i, pData->Sensor[i].Value); } pData = (Test2_t*)&Data1; printf("그냥 포인터로 접근\n"); for(i = 0; i < 5; i++) { printf("[%d] %f\n", i, pData->Sensor[i].Value); } return 0; } |
Even the smallest candle burns brighter in the dark.    
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.png ":)")
- ![[http]](/imgs/http.png)
