c++ 十六進制字元串存入檔案執行個體

c++ 十六進制字元串存入檔案：

方法一：

void writeToFile()

{

const char* str = "000000DD000000E00000015C000000E2";

FILE* file = fopen("test.txt", "wb");

assert(file);

size_t len = 0;

uint8_t* buf2 = ConvertToBinBuf(str, &len);

fwrite(buf2, 1, len, file);

free(buf2);

fclose(file);

printf(".......................\n");

}

size_t ConvertHexStrToInt(const char* hex_str, size_t length)

{

size_t sum = 0;

for (size_t i = 0; i < length; ++i)

{

int asc = (int)hex_str[i];

size_t r1 = (asc & 0x40) ? (asc & 0x0F) + 0x9 : (asc & 0x0F);

sum += (r1*pow(16, length - i - 1));

}

return sum;

}

uint8_t * ConvertToFileBuf(const char* hex_str, size_t *buf_size)

{

if (!hex_str)

{

*buf_size = 0;

return NULL;

}

//1.偶數個

size_t len = strlen(hex_str);

assert(!(len % 2));

*buf_size = len / 2;

uint8_t* buf = (uint8_t*)malloc(*buf_size);

for (size_t i = 0, j = 0; i < len; i += 2, ++j)

{

uint8_t value = (uint8_t)ConvertHexStrToInt(hex_str + i, 2);

buf[j] = value;

}

return buf;

}

方法二：

void writeToFile()

{

uint8_t buf[] =

{

0x00, 0x00, 0x00, 0xDD,

0x00, 0x00, 0x00, 0xE0,

0x00, 0x00, 0x01, 0x5C,

0x00, 0x00, 0x00, 0xE2

};

FILE* file = fopen("test.txt", "wb");

assert(file);

size_t len = 16;

fwrite(buf, 1, len, file);

fclose(file);

printf(".......................\n");

}