我正在尝试使用C ++将十六进制数转换为短(2字节)
一切正常,除了一件事...从短到字节的签名转换(最后一次测试)
我发现了这个问题,无法从中真正受益:portable signed/unsigned byte cast,C++
这是我的测试:
// test 1 - positive B2Short (success)
byte *b = new byte[2];
b[0] = 0x10; //low byte
b[1] = 0x00; //heigh byte
signed short test = 0;
test = ByteToShort(b);
cout << test << endl;
// test 2 - negative B2Short (success)
b[0] = 0xF0; //low byte
b[1] = 0xFF; //heigh byte
test = 0;
test = ByteToShort(b);
cout << test << endl;
// test 3 - positive Short2B (success)
signed short n = 11;
ShortToByte(n, b);
test = ByteToShort(b); // for display to see if it worked
cout << test << endl;
// test 4 - negative Short2B (FAIL!)
n = -11;
ShortToByte(n, b);
test = ByteToShort(b); // for display to see if it worked
cout << test << endl;
使用的功能:
signed short ByteToShort(byte* bytes){
signed short result = 0;
result = (result<<8) + bytes[1]; // heigh byte
result = (result<<8) + bytes[0]; // low byte
return result;
}
void ShortToByte(signed short num, byte* bytes){
bytes[1] = num & 0xFF00; // heigh byte
bytes[0] = num & 0x00FF; // low byte
}
输出:
16
-16
11
245
最佳答案
来自ShortToByte
:
bytes[1] = num & 0xFF00; // high byte
您必须将其右移8位以使结果适合一个字节。否则,您只会从低端获得零。
关于c++ - 在C++中从短到字节签名,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10288109/