Issue
How do you read the mouse button state from /dev/input/mice? I want to detect if the button is pressed down.
id='dv4'>
Solution
You can open the device and read from it. Events from /dev/input/mice are 3 bytes long and require some parsing. I think the prefered method now is to use /dev/input/event# instead. However, here is a small example using /dev/input/mice.
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc, char** argv)
{
int fd, bytes;
unsigned char data[3];
const char *pDevice = "/dev/input/mice";
// Open Mouse
fd = open(pDevice, O_RDWR);
if(fd == -1)
{
printf("ERROR Opening %s\n", pDevice);
return -1;
}
int left, middle, right;
signed char x, y;
while(1)
{
// Read Mouse
bytes = read(fd, data, sizeof(data));
if(bytes > 0)
{
left = data[0] & 0x1;
right = data[0] & 0x2;
middle = data[0] & 0x4;
x = data[1];
y = data[2];
printf("x=%d, y=%d, left=%d, middle=%d, right=%d\n", x, y, left, middle, right);
}
}
return 0;
}
One mouse click generates this:
x=0, y=0, left=1, middle=0, right=0
x=0, y=0, left=0, middle=0, right=0
And one mouse move (Note the "relative" mouse move coordinates):
x=1, y=1, left=0, middle=0, right=0
Answered By - JustinB Answer Checked By - Mildred Charles (WPSolving Admin)