[置顶] linux下input event事件,可以用后台截取键盘按下的键值,后台截取数据.....input.h
2014-12-04 12:00
447 查看
如何读取Linux键值,输入子系统,key,dev/input/event,dev/event,C语言键盘?
这里先上一段代码,自己拿到linux系统运行就可以,注意代码中keys_fd = open("/dev/input/event2", O_RDONLY); 这里去你的/dev/input/event2的event事件,去查看你的键盘事件是那一个,如果是event3那么你改成event3好了。这里给一个命令你去查看 cat
/proc/bus/usb/devices
http://www.jb51.net/LINUXjishu/30628.html如果还是查找不到请看这个链接。 在一个终端中运行下面的代码,再打开另开一个中按下按键,然后查看第一个终端中输出的信息你就知道是怎么回事了,哈哈,是不是获取你按下键盘的键值了???
oh yeah! 建议再去查看一下linux下input 子系统的介绍和查看一下input.h文件,网上一大堆,你一查你就知道了是怎么回事了。
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <linux/input.h>
int main()
{
int keys_fd;
char ret[2];
struct input_event t;
keys_fd = open("/dev/input/event2", O_RDONLY);
if (keys_fd <= 0)
{
printf("open /dev/input/event2 device error!\n");
return 0;
}
while (1)
{
if (read(keys_fd, &t, sizeof (t)) == sizeof (t))
{
if (t.type == EV_KEY)
if (t.value == 0 || t.value == 1)
{
printf("key %d %s\n", t.code, (t.value) ? "Pressed" : "Released");
if (t.code == KEY_ESC)
break;
}
}
}
close(keys_fd);
return 0;
}好了,这里给出一个重量级的代码,比上面的更完整.,自己拿去运行好好分析一下就知道怎么回事了....
/*
* Copyright 2002 Red Hat Inc., Durham, North Carolina.
*
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation on the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* This is a simple test program that reads from /dev/input/event*,
* decoding events into a human readable form.
*/
/*
* Authors:
* Rickard E. (Rik) Faith <faith@redhat.com>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <linux/input.h>
struct input_event event;
int main(int argc, char **argv)
{
char name[64]; /* RATS: Use ok, but could be better */
char buf[256] = { 0, }; /* RATS: Use ok */
unsigned char mask[EV_MAX / 8 + 1]; /* RATS: Use ok */
int version;
int fd = 0;
int rc;
int i, j;
char *tmp;
#define test_bit(bit) (mask[(bit)/8] & (1 << ((bit)%8)))
for (i = 0; i < 32; i++) {
sprintf(name, "/dev/input/event%d", i);
if ((fd = open(name, O_RDONLY, 0)) >= 0) {
ioctl(fd, EVIOCGVERSION, &version);
ioctl(fd, EVIOCGNAME(sizeof(buf)), buf);
ioctl(fd, EVIOCGBIT(0, sizeof(mask)), mask);
printf("%s\n", name);
printf(" evdev version: %d.%d.%d\n",
version >> 16, (version >> 8) & 0xff, version & 0xff);
printf(" name: %s\n", buf);
printf(" features:");
for (j = 0; j < EV_MAX; j++) {
if (test_bit(j)) {
const char *type = "unknown";
switch (j) {
case EV_KEY: type = "keys/buttons"; break;
case EV_REL: type = "relative"; break;
case EV_ABS: type = "absolute"; break;
case EV_MSC: type = "reserved"; break;
case EV_LED: type = "leds"; break;
case EV_SND: type = "sound"; break;
case EV_REP: type = "repeat"; break;
case EV_FF: type = "feedback"; break;
}
printf(" %s", type);
}
}
printf("\n");
close(fd);
}
}
if (argc > 1) {
sprintf(name, "/dev/input/event%d", atoi(argv[1]));
if ((fd = open(name, O_RDWR, 0)) >= 0) {
printf("%s: open, fd = %d\n", name, fd);
for (i = 0; i < LED_MAX; i++) {
event.time.tv_sec = time(0);
event.time.tv_usec = 0;
event.type = EV_LED;
event.code = i;
event.value = 0;
write(fd, &event, sizeof(event));
}
while ((rc = read(fd, &event, sizeof(event))) > 0) {
printf("%-24.24s.%06lu type 0x%04x; code 0x%04x;"
" value 0x%08x; ",
ctime(&event.time.tv_sec),
event.time.tv_usec,
event.type, event.code, event.value);
switch (event.type) {
case EV_KEY:
if (event.code > BTN_MISC) {
printf("Button %d %s",
event.code & 0xff,
event.value ? "press" : "release");
}
else {
printf("Key %d (0x%x) %s",
event.code & 0xff,
event.code & 0xff,
event.value ? "press" : "release");
}
break;
case EV_REL:
switch (event.code) {
case REL_X: tmp = "X"; break;
case REL_Y: tmp = "Y"; break;
case REL_HWHEEL: tmp = "HWHEEL"; break;
case REL_DIAL: tmp = "DIAL"; break;
case REL_WHEEL: tmp = "WHEEL"; break;
case REL_MISC: tmp = "MISC"; break;
default: tmp = "UNKNOWN"; break;
}
printf("Relative %s %d", tmp, event.value);
break;
case EV_ABS:
switch (event.code) {
case ABS_X: tmp = "X"; break;
case ABS_Y: tmp = "Y"; break;
case ABS_Z: tmp = "Z"; break;
case ABS_RX: tmp = "RX"; break;
case ABS_RY: tmp = "RY"; break;
case ABS_RZ: tmp = "RZ"; break;
case ABS_THROTTLE: tmp = "THROTTLE"; break;
case ABS_RUDDER: tmp = "RUDDER"; break;
case ABS_WHEEL: tmp = "WHEEL"; break;
case ABS_GAS: tmp = "GAS"; break;
case ABS_BRAKE: tmp = "BRAKE"; break;
case ABS_HAT0X: tmp = "HAT0X"; break;
case ABS_HAT0Y: tmp = "HAT0Y"; break;
case ABS_HAT1X: tmp = "HAT1X"; break;
case ABS_HAT1Y: tmp = "HAT1Y"; break;
case ABS_HAT2X: tmp = "HAT2X"; break;
case ABS_HAT2Y: tmp = "HAT2Y"; break;
case ABS_HAT3X: tmp = "HAT3X"; break;
case ABS_HAT3Y: tmp = "HAT3Y"; break;
case ABS_PRESSURE: tmp = "PRESSURE"; break;
case ABS_DISTANCE: tmp = "DISTANCE"; break;
case ABS_TILT_X: tmp = "TILT_X"; break;
case ABS_TILT_Y: tmp = "TILT_Y"; break;
case ABS_MISC: tmp = "MISC"; break;
default: tmp = "UNKNOWN"; break;
}
printf("Absolute %s %d", tmp, event.value);
break;
case EV_MSC: printf("Misc"); break;
case EV_LED: printf("Led"); break;
case EV_SND: printf("Snd"); break;
case EV_REP: printf("Rep"); break;
case EV_FF: printf("FF"); break;
break;
}
printf("\n");
}
printf("rc = %d, (%s)\n", rc, strerror(errno));
close(fd);
}
}
return 0;
}
这里先上一段代码,自己拿到linux系统运行就可以,注意代码中keys_fd = open("/dev/input/event2", O_RDONLY); 这里去你的/dev/input/event2的event事件,去查看你的键盘事件是那一个,如果是event3那么你改成event3好了。这里给一个命令你去查看 cat
/proc/bus/usb/devices
http://www.jb51.net/LINUXjishu/30628.html如果还是查找不到请看这个链接。 在一个终端中运行下面的代码,再打开另开一个中按下按键,然后查看第一个终端中输出的信息你就知道是怎么回事了,哈哈,是不是获取你按下键盘的键值了???
oh yeah! 建议再去查看一下linux下input 子系统的介绍和查看一下input.h文件,网上一大堆,你一查你就知道了是怎么回事了。
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <linux/input.h>
int main()
{
int keys_fd;
char ret[2];
struct input_event t;
keys_fd = open("/dev/input/event2", O_RDONLY);
if (keys_fd <= 0)
{
printf("open /dev/input/event2 device error!\n");
return 0;
}
while (1)
{
if (read(keys_fd, &t, sizeof (t)) == sizeof (t))
{
if (t.type == EV_KEY)
if (t.value == 0 || t.value == 1)
{
printf("key %d %s\n", t.code, (t.value) ? "Pressed" : "Released");
if (t.code == KEY_ESC)
break;
}
}
}
close(keys_fd);
return 0;
}好了,这里给出一个重量级的代码,比上面的更完整.,自己拿去运行好好分析一下就知道怎么回事了....
/*
* Copyright 2002 Red Hat Inc., Durham, North Carolina.
*
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation on the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* This is a simple test program that reads from /dev/input/event*,
* decoding events into a human readable form.
*/
/*
* Authors:
* Rickard E. (Rik) Faith <faith@redhat.com>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <linux/input.h>
struct input_event event;
int main(int argc, char **argv)
{
char name[64]; /* RATS: Use ok, but could be better */
char buf[256] = { 0, }; /* RATS: Use ok */
unsigned char mask[EV_MAX / 8 + 1]; /* RATS: Use ok */
int version;
int fd = 0;
int rc;
int i, j;
char *tmp;
#define test_bit(bit) (mask[(bit)/8] & (1 << ((bit)%8)))
for (i = 0; i < 32; i++) {
sprintf(name, "/dev/input/event%d", i);
if ((fd = open(name, O_RDONLY, 0)) >= 0) {
ioctl(fd, EVIOCGVERSION, &version);
ioctl(fd, EVIOCGNAME(sizeof(buf)), buf);
ioctl(fd, EVIOCGBIT(0, sizeof(mask)), mask);
printf("%s\n", name);
printf(" evdev version: %d.%d.%d\n",
version >> 16, (version >> 8) & 0xff, version & 0xff);
printf(" name: %s\n", buf);
printf(" features:");
for (j = 0; j < EV_MAX; j++) {
if (test_bit(j)) {
const char *type = "unknown";
switch (j) {
case EV_KEY: type = "keys/buttons"; break;
case EV_REL: type = "relative"; break;
case EV_ABS: type = "absolute"; break;
case EV_MSC: type = "reserved"; break;
case EV_LED: type = "leds"; break;
case EV_SND: type = "sound"; break;
case EV_REP: type = "repeat"; break;
case EV_FF: type = "feedback"; break;
}
printf(" %s", type);
}
}
printf("\n");
close(fd);
}
}
if (argc > 1) {
sprintf(name, "/dev/input/event%d", atoi(argv[1]));
if ((fd = open(name, O_RDWR, 0)) >= 0) {
printf("%s: open, fd = %d\n", name, fd);
for (i = 0; i < LED_MAX; i++) {
event.time.tv_sec = time(0);
event.time.tv_usec = 0;
event.type = EV_LED;
event.code = i;
event.value = 0;
write(fd, &event, sizeof(event));
}
while ((rc = read(fd, &event, sizeof(event))) > 0) {
printf("%-24.24s.%06lu type 0x%04x; code 0x%04x;"
" value 0x%08x; ",
ctime(&event.time.tv_sec),
event.time.tv_usec,
event.type, event.code, event.value);
switch (event.type) {
case EV_KEY:
if (event.code > BTN_MISC) {
printf("Button %d %s",
event.code & 0xff,
event.value ? "press" : "release");
}
else {
printf("Key %d (0x%x) %s",
event.code & 0xff,
event.code & 0xff,
event.value ? "press" : "release");
}
break;
case EV_REL:
switch (event.code) {
case REL_X: tmp = "X"; break;
case REL_Y: tmp = "Y"; break;
case REL_HWHEEL: tmp = "HWHEEL"; break;
case REL_DIAL: tmp = "DIAL"; break;
case REL_WHEEL: tmp = "WHEEL"; break;
case REL_MISC: tmp = "MISC"; break;
default: tmp = "UNKNOWN"; break;
}
printf("Relative %s %d", tmp, event.value);
break;
case EV_ABS:
switch (event.code) {
case ABS_X: tmp = "X"; break;
case ABS_Y: tmp = "Y"; break;
case ABS_Z: tmp = "Z"; break;
case ABS_RX: tmp = "RX"; break;
case ABS_RY: tmp = "RY"; break;
case ABS_RZ: tmp = "RZ"; break;
case ABS_THROTTLE: tmp = "THROTTLE"; break;
case ABS_RUDDER: tmp = "RUDDER"; break;
case ABS_WHEEL: tmp = "WHEEL"; break;
case ABS_GAS: tmp = "GAS"; break;
case ABS_BRAKE: tmp = "BRAKE"; break;
case ABS_HAT0X: tmp = "HAT0X"; break;
case ABS_HAT0Y: tmp = "HAT0Y"; break;
case ABS_HAT1X: tmp = "HAT1X"; break;
case ABS_HAT1Y: tmp = "HAT1Y"; break;
case ABS_HAT2X: tmp = "HAT2X"; break;
case ABS_HAT2Y: tmp = "HAT2Y"; break;
case ABS_HAT3X: tmp = "HAT3X"; break;
case ABS_HAT3Y: tmp = "HAT3Y"; break;
case ABS_PRESSURE: tmp = "PRESSURE"; break;
case ABS_DISTANCE: tmp = "DISTANCE"; break;
case ABS_TILT_X: tmp = "TILT_X"; break;
case ABS_TILT_Y: tmp = "TILT_Y"; break;
case ABS_MISC: tmp = "MISC"; break;
default: tmp = "UNKNOWN"; break;
}
printf("Absolute %s %d", tmp, event.value);
break;
case EV_MSC: printf("Misc"); break;
case EV_LED: printf("Led"); break;
case EV_SND: printf("Snd"); break;
case EV_REP: printf("Rep"); break;
case EV_FF: printf("FF"); break;
break;
}
printf("\n");
}
printf("rc = %d, (%s)\n", rc, strerror(errno));
close(fd);
}
}
return 0;
}
相关文章推荐
- 如何读取Linux键值,输入子系统,key,dev/input/event,dev/event,C语言键盘
- linux键盘input_event浅析【转】
- [置顶] jquery 将table中input[name=""]内容转换为json数据返回后台
- Linux之解析鼠标input事件数据(有BUG,已经解决)
- js中对arry数组的各种操作小结 瀑布流AJAX无刷新加载数据列表--当页面滚动到Id时再继续加载数据 web前端url传递值 js加密解密 HTML中让表单input等文本框为只读不可编辑的方法 js监听用户的键盘敲击事件,兼容各大主流浏览器 HTML特殊字符
- GridView模板列,如何在后台代码中添加客户端事件,执行sql函数,格式化数据
- 可以传输自定义数据的事件类
- Input表单值改变(非键盘直接输入)后触发事件
- 如何使得一个JComponent组件不论是否获得焦点,都可以响应键盘事件
- 回发或回调参数无效。在配置中使用 或在页面中使用 启用了事件验证。出于安全目的,此功能验证回发或回调事件的参数是否来源于最初呈现这些事件的服务器控件。如果数据有效并且是预期的,则使用 ClientScriptManager.RegisterForEventValidation 方法来注册回发或回调数据以进行验证。
- 【DFB】IDirectFBInputDevice 方式处理事件 --键盘移动一个图片显示
- Symbian (V5 Console HandleEvent)后台事件捕获
- 先读数据再弹出对话框根据对话框的选择来触发事件 confirm button input
- 论基于数据访问的集合类(Data Access Based Collection)和领域事件(Domain Event)模式
- 键盘虚拟键值编码表 使用keybd_Event
- 键盘虚拟键值编码表 使用keybd_Event
- qt 键盘按键事件 范例 keyPreEvent()
- 回发或回调参数无效。在配置中使用 或在页面中使用 启用了事件验证。出于安全目的,此功能验证回发或回调事件的参数是否来源于最初呈现这些事件的服务器控件。如果数据有效并且是预期的,则使用 ClientScriptManager.RegisterForEvent
- VS2003 C#:重写键盘响应事件、动态创建控件、创建线程、在线程中使用委托在界面显示数据
- Event事件----鼠标键盘举例