union用于数据转换

见云御甲

于 2021-12-21 15:30:32 发布

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分类专栏：嵌入式技巧文章标签： c++ 后端

原文链接：https://www.cnblogs.com/zx-hit/p/11988954.html

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16进制字符串字节转化为十进制数

typedef union DATA_TO_BYTE
 {
	 uint16_t data16;
	 unsigned char b[2];
 }TO_TWO_BYTE;
 
 TO_TWO_BYTE x;
 x.b[0] = (unsigned char)0x00;//低8位
 x.b[1] = (unsigned char)0x16;//高8位
 std::cout<<x.data16<<std::endl;

// char to float
  char sBuf[4];
  sBuf[0] = 0xc9;
  sBuf[1] = 0x4f;
  sBuf[2] = 0x7d;
  sBuf[3] = 0x43;
  float zx = *(float *)(sBuf);
  std::cout<< zx <<std::endl;//终端输出为253.312

  // float to char
  float wTemp = 50;
  char  sBuf1[4];
  char* temp;
  memset(sBuf1, 0, sizeof(sBuf1));

  temp     = (char *)(&wTemp);
  sBuf1[0] = temp[0];
  sBuf1[1] = temp[1];
  sBuf1[2] = temp[2];
  sBuf1[3] = temp[3];