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Show and parse all mouse/trackball related events
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| /* gcc -Wall -Wextra mstr_events.c -o mstr_events | |
| /dev/input/eventX (X=0 mouse, X=3 trackball) | |
| */ | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| #include <assert.h> | |
| #include <linux/input.h> | |
| #include <fcntl.h> | |
| int main(int argc, char *argv[]) | |
| { | |
| int fd; | |
| struct input_event ie; | |
| assert(argc==2); | |
| assert(strncmp(argv[1], "/dev/input/event", 16)==0); | |
| if((fd = open(argv[1], O_RDONLY)) == -1) { | |
| perror("opening device"); | |
| exit(EXIT_FAILURE); | |
| } | |
| while(read(fd, &ie, sizeof(struct input_event))) { | |
| printf("time%ld.%06ld\ttype %d\tcode %d\tvalue %d\n", | |
| ie.time.tv_sec, ie.time.tv_usec, ie.type, ie.code, ie.value); | |
| if (ie.type == EV_SYN) | |
| { | |
| if (ie.code == SYN_REPORT) { printf("syn report\n"); } | |
| else { printf("syn (%d)\n", ie.code); } | |
| } | |
| else if (ie.type == EV_MSC) | |
| { | |
| if (ie.code == MSC_SCAN) { printf("msc scan\n"); } | |
| else { printf("msc (%d)\n", ie.code); } | |
| } | |
| else if (ie.type == EV_REL) | |
| { | |
| if (ie.code==REL_X) { printf("relX\t %d\n", ie.value); } | |
| else if (ie.code==REL_Y) { printf("relY\t %d\n", ie.value); } | |
| else if (ie.code==REL_WHEEL) | |
| { | |
| printf("rel wheel\t"); | |
| assert(0!=read(fd, &ie, sizeof(struct input_event))); | |
| assert(ie.type == EV_REL); | |
| if (ie.value > 0) { printf("up\n"); } | |
| else { printf("down\n"); } | |
| } | |
| else if (ie.code == REL_HWHEEL) | |
| { | |
| printf("rel wheel\t"); | |
| assert(0!=read(fd, &ie, sizeof(struct input_event))); | |
| assert(ie.type==EV_REL); | |
| if (ie.value > 0) { printf("right\n"); } | |
| else { printf("left\n"); } | |
| } | |
| } | |
| else if (ie.type == EV_KEY) | |
| { | |
| if (ie.code == BTN_LEFT) { printf("Left mouse button "); } | |
| else if (ie.code == BTN_RIGHT) { printf("Right mouse button "); } | |
| else if (ie.code == BTN_MIDDLE) { printf("Wheel/Middle "); } | |
| if (ie.value == 0) { printf("released\n"); } | |
| else if (ie.value == 1) { printf("pressed\n"); } | |
| else { printf("??? key\n"); } | |
| } | |
| } | |
| return 0; | |
| } |
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compile instructions in 1st line.
Need to pass "/dev/input/eventX" as arg, on Pi400 mouse is X=0 and trackball is X=3.
All events are the same for both, beside REL_HWHEEL (moving wheel to left or right):
This is an event analysis tool, so always event type+code+value are reported.
Program deals with SYN and MSC events as far as they happen when only using mouse/trackball.
Relative moves:
Left button press+release:
Wheel can be pressed as well:
Wheel can move up+down as well: