C++ 如何使用输入子系统生成击键事件
我正在Linux中编写一个键盘模拟器程序,首先我能够在X11窗口中渲染按键,但这在虚拟终端中不起作用,并尝试不同的方法。我参考了uinput内核模块并尝试了它。根据教程,击键可以作为uinput事件注入,我相应地编写了下面的代码C++ 如何使用输入子系统生成击键事件,c++,c,keyboard,keyboard-events,uinput,C++,C,Keyboard,Keyboard Events,Uinput,我正在Linux中编写一个键盘模拟器程序,首先我能够在X11窗口中渲染按键,但这在虚拟终端中不起作用,并尝试不同的方法。我参考了uinput内核模块并尝试了它。根据教程,击键可以作为uinput事件注入,我相应地编写了下面的代码 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #includ
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/uinput.h>
#include <iostream>
#include <time.h>
#include <string>
#define die(str, args...) do { \
perror(str); \
exit(EXIT_FAILURE); \
} while(0)
int main(void)
{
int fd_keyEmulator;
struct uinput_user_dev uidev;
struct input_event ev;
int dx, dy;
int i;
fd_keyEmulator = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
if(fd_keyEmulator < 0)
{
std::cout << "error: open : " << strerror(errno) << std::endl;
}
int ret;
//ret = ioctl(fd_keyEmulator, UI_SET_EVBIT, EV_KEY);
//ret = ioctl(fd_keyEmulator, UI_SET_KEYBIT, KEY_D);
//ret = ioctl(fd_keyEmulator, UI_SET_EVBIT, EV_SYN);
sleep(5);
if (ioctl(fd_keyEmulator, UI_SET_EVBIT, EV_KEY) < 0)
{
std::cout << "test 1 ..." << std::endl;
die("error: ioctl");
}
if (ioctl(fd_keyEmulator, UI_SET_KEYBIT, KEY_D) < 0)
{
std::cout << "test 2 ..." << std::endl;
die("error: ioctl");
}
if (ioctl(fd_keyEmulator, UI_SET_EVBIT, EV_REL) < 0)
{
std::cout << "test 3 ..." << std::endl;
die("error: ioctl");
}
memset(&uidev, 0, sizeof(uidev));
snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "keyboard-emulator");
uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x1;
uidev.id.product = 0x1;
uidev.id.version = 1;
std::cout << "Writing key press..." << std::endl;
if(write(fd_keyEmulator, &uidev, sizeof(uidev)) < 0)
std::cout << "error: write" << strerror(errno) << std::endl;
if(ioctl(fd_keyEmulator, UI_DEV_CREATE) < 0)
std::cout << "error: ioctl" << strerror(errno) << std::endl;
memset(&ev, 0, sizeof(ev));
ev.type = EV_REL;
ev.code = KEY_D;
ev.value = 1;
//ret = write(fd_keyEmulator, &ev, sizeof(ev));
if (write(fd_keyEmulator, &ev, sizeof (struct input_event)) < 0)
die("error: write");
if (write(fd_keyEmulator, &ev, sizeof (struct input_event)) < 0)
die("error: write");
if (write(fd_keyEmulator, &ev, sizeof (struct input_event)) < 0)
die("error: write");
if (write(fd_keyEmulator, &ev, sizeof (struct input_event)) < 0)
die("error: write");
if(ioctl(fd_keyEmulator, UI_DEV_DESTROY) < 0)
std::cout << "error: ioctl" << strerror(errno) << std::endl;
close(fd_keyEmulator);
}
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#定义die(str,args…)do{\
perror(str)\
退出(退出失败)\
}而(0)
内部主(空)
{
int fd_键仿真器;
结构uinput_user_dev uidev;
结构输入\事件ev;
int-dx,dy;
int i;
fd_keyEmulator=open(“/dev/uinput”,O_WRONLY | O_NONBLOCK);
如果(fd_键仿真器<0)
{
std::cout以上两个程序没有问题。这里的问题是,这个程序创建了一个新的输入设备(可能在“/dev/input”中的某个地方),而X无法足够快地注册输入设备,以便它能够获取输入。一个简单的“sleep(1)”(带有适当的“#include”)在创建输入设备之后,问题就解决了。具体来说(可能是不必要的),在更改代码之后,程序将按预期运行,因为现在X有足够的时间来实现新的输入设备。在下面的代码段之后添加sleep()语句
// create the device via an IOCTL call
if(ioctl(fd_key_emulator, UI_DEV_CREATE))
{
std::cout << "Error in ioctl : UI_DEV_CREATE : " << strerror(errno) << std::endl;
}
// add 1 second sleep.
sleep (1);
// now fd_key_emulator represents the end-point file descriptor of the new input device.
//通过IOCTL调用创建设备
if(ioctl(fd_-key_-emulator,UI_-DEV_-CREATE))
{
标准::cout
// create the device via an IOCTL call
if(ioctl(fd_key_emulator, UI_DEV_CREATE))
{
std::cout << "Error in ioctl : UI_DEV_CREATE : " << strerror(errno) << std::endl;
}
// add 1 second sleep.
sleep (1);
// now fd_key_emulator represents the end-point file descriptor of the new input device.