问题描述
如何在Linux API读/写功能中使用C ++位集容器?
类似这样的东西:
#include <vector>
#include <bitset>
#include <fcntl.h> // Linux API open
#include <unistd.h> // Linux API read,write,close
using namespace std;
int main() {
// Some 8-bit register of some device
// Using vector for read and write operations.
// Using bitset to manipulate individual bits.
vector<bitset<8>> control_register;
// Set bit 1 of control_register to 1 (true).
control_register[0].set(1);
// Open new file for writing (create file)
int fd = 0;
const char *path = "./test.txt";
fd = (open(path,O_WRONLY | O_CREAT | O_Trunc,S_IRWXU));
// Write to file from vector (using Linux API)
write(fd,control_register.data(),control_register.size());
// close file
close(fd);
return 0;
}
我们可以不使用向量容器立即写一个位集吗?
解决方法
您可以做的是,在写入数据之前将其转换为std::bitset
。像
std::bitset<8> controlRegister = 0b00101100; // Use some consts and combine them
// with bitwise or (|) to make this more
// human readable
uint8_t ctrl = static_cast<uint8_t>(controlRegister.to_ulong() & 0xFF);
write(fd,&ctrl,1);