如何在Linux中控制鼠标移动？
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How to control mouse movement in linux?
提问by thundertrick
I try to control the mouse in Linux. Xlib seems to works, but when I try to use it with OpenCV, it keeps returning:
我尝试在 Linux 中控制鼠标。Xlib 似乎有效，但是当我尝试将它与 OpenCV 一起使用时，它不断返回：
Resource temporarily unavailable
So I decide to write "/dev/psaux". The code is as following:
所以我决定写“/dev/psaux”。代码如下：
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main() {
unsigned char a[5]={0, 0xff, 0, 0x28, 0xff};
int fp = open ("/dev/psaux", O_WRONLY);
if(!fp)printf("open error:%s\n", strerror(errno));
for(int i = 0; i < 10; i++)
printf("write:%d\t\t%s\n", write(fp, a, 5), strerror(errno));
close(fp);
return 0;
}
Compile it with:
编译它：
gcc my_psaux.c -o my_psaux -std=gnu99 -g
Run and get
运行并获取
$sudo ./my_psaux
write:5 Success
write:5 Success
write:5 Success
write:5 Success
write:5 Success
write:5 Success
write:5 Success
write:5 Success
write:5 Success
write:5 Success
However the mouse doesn't move. Then I open a new terminal, type in "sudo cat /dev/psaux" and run "my_psaux". But I just cat nothing. Nothing is written into "/dev/psaux" ?
但是鼠标不动。然后我打开一个新终端，输入“sudo cat /dev/psaux”并运行“my_psaux”。但我只是什么都不知道。"/dev/psaux" 中没有写入任何内容？
Could anyone help me?
有人可以帮助我吗？
If this is not a good method to control the mouse, could anyone tell me another one?
如果这不是控制鼠标的好方法，谁能告诉我另一种方法？
采纳答案by thundertrick
Great thanks to @R..for reminding me of some other ways instead of /dev/psaux
非常感谢@R ..提醒我一些其他方式而不是 /dev/psaux
So I tried /dev/input/mouse*and /dev/input/event*
于是，我就/dev/input/mouse*和/dev/input/event*
By using
通过使用
cat /proc/bus/input/devices
I get this:
我明白了：
I: Bus=0003 Vendor=0461 Product=4d81 Version=0111
N: Name="USB Optical Mouse"
P: Phys=usb-0000:00:1d.0-1/input0
S: Sysfs=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/input/input10
U: Uniq=
H: Handlers=mouse2 event10
B: EV=17
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=143
B: MSC=10
After testing, only /dev/input/event10works. The code is as following:
经测试，才/dev/input/event10有效。代码如下：
#include <stdio.h>
#include <unistd.h>
#include <linux/input.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
int main() {
struct input_event event, event_end;
int fd = open("/dev/input/event10", O_RDWR);
if (fd < 0) {
printf("Errro open mouse:%s\n", strerror(errno));
return -1;
}
memset(&event, 0, sizeof(event));
memset(&event, 0, sizeof(event_end));
gettimeofday(&event.time, NULL);
event.type = EV_REL;
event.code = REL_X;
event.value = 100;
gettimeofday(&event_end.time, NULL);
event_end.type = EV_SYN;
event_end.code = SYN_REPORT;
event_end.value = 0;
for (int i=0; i<5; i++) {
write(fd, &event, sizeof(event));// Move the mouse
write(fd, &event_end, sizeof(event_end));// Show move
sleep(1);// wait
}
close(fd);
return 0;
}
回答by R.. GitHub STOP HELPING ICE
The mouse is not a loopback/echo device. It's more like a terminal. Would you expect writing data to a terminal (which would appear on the screen) to make the same characters come back to you as input? The same applies to the mouse; the only point in writing to it is to send escape sequences that change its mode (e.g. the protocol used or the resolution).
鼠标不是环回/回声设备。它更像是一个终端。您是否希望将数据写入终端（会出现在屏幕上）以使相同的字符作为输入返回给您？这同样适用于鼠标；写入它的唯一要点是发送改变其模式（例如使用的协议或分辨率）的转义序列。
If you want to "control" the mouse, you have to inject events some other way, or provide a fifo (named pipe) or pseudo-tty in place of /dev/psauxfor the input system to read from. However this is probably a rather misguided way to do things...
如果你想“控制”鼠标，你必须以其他方式注入事件，或者提供一个 fifo（命名管道）或伪 tty 来代替/dev/psaux输入系统读取。然而，这可能是一种相当误导的做事方式......
If you explain why you need to control the mouse, perhaps we could offer you better alternative approaches to what you're trying to do.
如果您解释为什么需要控制鼠标，也许我们可以为您提供更好的替代方法来完成您的工作。
