linux系统中条码如何识别的,如何（可靠地）在嵌入式（无头）Linux中读取USB条形码扫描仪？...

对于处于同样困境的人来说&＃xff1a;

我找不到一个纯Python工作的解决方案。在

我求助于一个非常简单的“C”程序(大部分是表)&＃xff1a;#include

#include

#include

#include

#include

#include

void INThandler() {

exit(0);

}

char ttab[] &＃61; {

0, 27, &＃39;1&＃39;, &＃39;2&＃39;, &＃39;3&＃39;, &＃39;4&＃39;, &＃39;5&＃39;, &＃39;6&＃39;, &＃39;7&＃39;, &＃39;8&＃39;, &＃39;9&＃39;, &＃39;0&＃39;, &＃39;-&＃39;, &＃39;&＃61;&＃39;, &＃39;\b&＃39;, /* Backspace */

&＃39;\t&＃39;, &＃39;q&＃39;, &＃39;w&＃39;, &＃39;e&＃39;, &＃39;r&＃39;, &＃39;t&＃39;, &＃39;y&＃39;, &＃39;u&＃39;, &＃39;i&＃39;, &＃39;o&＃39;, &＃39;p&＃39;, &＃39;[&＃39;, &＃39;]&＃39;,&＃39;\n&＃39;, /* Enter key */

0, &＃39;a&＃39;, &＃39;s&＃39;, &＃39;d&＃39;, &＃39;f&＃39;, &＃39;g&＃39;, &＃39;h&＃39;, &＃39;j&＃39;, &＃39;k&＃39;, &＃39;l&＃39;, &＃39;;&＃39;,&＃39;\&＃39;&＃39;, &＃39;&＃96;&＃39;, 0, /* Left shift */

&＃39;\\&＃39;, &＃39;z&＃39;, &＃39;x&＃39;, &＃39;c&＃39;, &＃39;v&＃39;, &＃39;b&＃39;, &＃39;n&＃39;, &＃39;m&＃39;, &＃39;,&＃39;, &＃39;.&＃39;, &＃39;/&＃39;, 0, /* Right shift */

&＃39;*&＃39;,

0, /* Alt */

&＃39; &＃39;, /* Space bar */

0, /* Caps lock */

0, /* 59 - F1 key ... > */

0, 0, 0, 0, 0, 0, 0, 0,

0, /* <... F10 */

0, /* 69 - Num lock*/

0, /* Scroll Lock */

0, /* Home key */

0, /* Up Arrow */

0, /* Page Up */

&＃39;-&＃39;,

0, /* Left Arrow */

0,

0, /* Right Arrow */

&＃39;&＃43;&＃39;,

0, /* 79 - End key*/

0, /* Down Arrow */

0, /* Page Down */

0, /* Insert Key */

0, /* Delete Key */

0, 0, 0,

0, /* F11 Key */

0, /* F12 Key */

0, /* All other keys are undefined */

};

char ntab[] &＃61; {

0, 27, &＃39;1&＃39;, &＃39;2&＃39;, &＃39;3&＃39;, &＃39;4&＃39;, &＃39;5&＃39;, &＃39;6&＃39;, &＃39;7&＃39;, &＃39;8&＃39;, &＃39;9&＃39;, &＃39;0&＃39;, &＃39;-&＃39;, &＃39;&＃61;&＃39;, &＃39;\b&＃39;, /* Backspace */

&＃39;\t&＃39;, &＃39;q&＃39;, &＃39;w&＃39;, &＃39;e&＃39;, &＃39;r&＃39;, &＃39;t&＃39;, &＃39;y&＃39;, &＃39;u&＃39;, &＃39;i&＃39;, &＃39;o&＃39;, &＃39;p&＃39;, &＃39;[&＃39;, &＃39;]&＃39;,&＃39;\n&＃39;, /* Enter key */

0, &＃39;a&＃39;, &＃39;s&＃39;, &＃39;d&＃39;, &＃39;f&＃39;, &＃39;g&＃39;, &＃39;h&＃39;, &＃39;j&＃39;, &＃39;k&＃39;, &＃39;l&＃39;, &＃39;;&＃39;,&＃39;\&＃39;&＃39;, &＃39;&＃96;&＃39;, 0, /* Left shift */

&＃39;\\&＃39;, &＃39;z&＃39;, &＃39;x&＃39;, &＃39;c&＃39;, &＃39;v&＃39;, &＃39;b&＃39;, &＃39;n&＃39;, &＃39;m&＃39;, &＃39;,&＃39;, &＃39;.&＃39;, &＃39;/&＃39;, 0, /* Right shift */

&＃39;*&＃39;,

0, /* Alt */

&＃39; &＃39;, /* Space bar */

0, /* Caps lock */

0, /* 59 - F1 key ... > */

0, 0, 0, 0, 0, 0, 0, 0,

0, /* <... F10 */

0, /* 69 - Num lock*/

0, /* Scroll Lock */

0, /* Home key */

0, /* Up Arrow */

0, /* Page Up */

&＃39;-&＃39;,

0, /* Left Arrow */

0,

0, /* Right Arrow */

&＃39;&＃43;&＃39;,

0, /* 79 - End key*/

0, /* Down Arrow */

0, /* Page Down */

0, /* Insert Key */

0, /* Delete Key */

0, 0, 0,

0, /* F11 Key */

0, /* F12 Key */

0, /* All other keys are undefined */

};

char stab[] &＃61; {

0, 27, &＃39;!&＃39;, &＃39;&＃64;&＃39;, &＃39;#&＃39;, &＃39;$&＃39;, &＃39;%&＃39;, &＃39;^&＃39;, &＃39;&&＃39;, &＃39;*&＃39;, &＃39;(&＃39;, &＃39;)&＃39;, &＃39;_&＃39;, &＃39;&＃43;&＃39;, 0, /* Backspace */

0, &＃39;Q&＃39;, &＃39;W&＃39;, &＃39;E&＃39;, &＃39;R&＃39;, &＃39;T&＃39;, &＃39;Y&＃39;, &＃39;U&＃39;, &＃39;I&＃39;, &＃39;O&＃39;, &＃39;P&＃39;, &＃39;{&＃39;, &＃39;}&＃39;, 0, /* Enter key */

0, &＃39;A&＃39;, &＃39;S&＃39;, &＃39;D&＃39;, &＃39;F&＃39;, &＃39;G&＃39;, &＃39;H&＃39;, &＃39;J&＃39;, &＃39;K&＃39;, &＃39;L&＃39;, &＃39;:&＃39;, &＃39;"&＃39;, 0,&＃39;\n&＃39;, /* Left shift */

0, &＃39;Z&＃39;, &＃39;X&＃39;, &＃39;C&＃39;, &＃39;V&＃39;, &＃39;B&＃39;, &＃39;N&＃39;, &＃39;M&＃39;, &＃39;&＃39;, &＃39;?&＃39;, 0, /* Right shift */

&＃39;*&＃39;,

0, /* Alt */

&＃39; &＃39;, /* Space bar */

0, /* Caps lock */

0, /* 59 - F1 key ... > */

0, 0, 0, 0, 0, 0, 0, 0,

0, /* <... F10 */

0, /* 69 - Num lock*/

0, /* Scroll Lock */

0, /* Home key */

0, /* Up Arrow */

0, /* Page Up */

&＃39;-&＃39;,

0, /* Left Arrow */

0,

0, /* Right Arrow */

&＃39;&＃43;&＃39;,

0, /* 79 - End key*/

0, /* Down Arrow */

0, /* Page Down */

0, /* Insert Key */

0, /* Delete Key */

0, 0, 0,

0, /* F11 Key */

0, /* F12 Key */

0, /* All other keys are undefined */

};

int main() {

char devname[] &＃61; "/dev/input/event0";

int device &＃61; open(devname, O_RDONLY);

struct input_event ev;

int shift &＃61; 0;

char line[4096], *p &＃61; line;

signal(SIGINT, INThandler);

fputs("starting\n", stdout);

//fputs("starting\n", stderr);

while (1) {

read(device, &ev, sizeof(ev));

if (ev.type &＃61;&＃61; 1) {

if (ev.code &＃61;&＃61; 42)

shift &＃61; ev.value;

else if (ev.value) {

//printf("Key: %i State: %i\n", ev.code, ev.value);

char *t &＃61; shift? stab: ntab;

char ch &＃61; t[ev.code];

//printf("Key: %02d State: %d [%c]\n", ev.code, ev.value, ch);

if (ch &＃61;&＃61; &＃39;\n&＃39;) {

*p &＃61; &＃39;\0&＃39;;

fputs(line, stdout); fputc(&＃39;\n&＃39;, stdout); fflush(stdout);

//fputs(line, stderr); fputc(&＃39;\n&＃39;, stderr); fflush(stderr);

p &＃61; line;

} else

*p&＃43;&＃43; &＃61; ch;

}

}

}

}

。。。从Python驱动&＃xff1a;

^{pr2}$

我相信Python驱动程序可以简化。这是我(工作)申请表中的逐字记录。在

嗨&＃xff01;在