用c++写一个uinput模拟触摸
时间: 2024-09-21 07:13:43 浏览: 42
在C++中,使用UInput (User Input Device) 模拟触摸屏需要一些Linux库支持,例如XInputExtension和libudev。以下是一个简单的示例,展示如何使用Linux的uinput工具包创建一个模拟触摸屏:
```cpp
#include <linux/uinput.h>
#include <fcntl.h>
#include <unistd.h>
#define UINPUT_DEV_NAME "touchscreen"
#define TOUCHSCREEN_AXES 5 // X, Y, Pressure, Size, Orientation
int main() {
int ufd;
struct sockaddr_u input_addr = { sizeof(input_addr), AF_UNIX };
char dev_path[PATH_MAX] = "/dev/input/uinput";
if ((ufd = open(dev_path, O_RDWR | O_CLOEXEC)) < 0) {
perror("Failed to open /dev/input/uinput");
return -1;
}
// 初始化uinput设备
struct uinput_user_dev uidev;
memset(&uidev, 0, sizeof(uidev));
strncpy(uidev.name, UINPUT_DEV_NAME, sizeof(uidev.name) - 1);
uidev.id.bustype = BUS_USB; // 假设USB设备
uidev.id.vendor = 0x1234; // 设备制造商ID
uidev.id.product = 0x5678; // 设备产品ID
if (ioctl(ufd, UIOCGABSINFO(sizeof(struct absinfo)*TOUCHSCREEN_AXES), &uidev.absinfo) != 0) {
perror("Failed to get ABS info for touchscreen");
return -1;
}
// 创建触摸事件
struct input_event ev;
ev.type = EV_ABS;
ev.code = ABS_MT_TOUCH_MAJOR; // 触摸面积
ev.value = 500; // 设置默认值
write(ufd, &ev, sizeof(ev));
close(ufd);
return 0;
}