Question

我一直试图将我的BBC Micro连接到我的Raspberry Pi并将其用作串口TTY上的键盘。我找到了一些很棒的code on Github to forward Serial Keypresses to X11，但我似乎无法按照我的希望让它发挥作用。我不擅长C并且有一个去，但遗憾的是没有任何地方。

下面的工作原理是，只有在按下“返回”时才会将按键发送到X11。麻烦的是，如果你键入'ABCDE（RETURN）'，它会发送'ABCDE'进入X11会话并点击返回键，你看不到你输入的内容，直到你回来。我想要它做的是当我按下'A'时发送'A'，当我按下B等时发送'B'。

我认为它似乎将某些缓冲区（readbuf？）中的所有内容控制在XFlush(dpy);以112缓冲字符输入到X11，所以将其移动到104（没有工作），尝试在53和155，希望能做到这一点。

任何帮助都将非常感谢！

static int serialPort;
static Display *dpy;

static void xtest_key_press(unsigned char letter) {
  unsigned int shiftcode = XKeysymToKeycode(dpy, XStringToKeysym("Shift_L"));
  int upper = 0;
  int skip_lookup = 0;
  char s[2];
  s[0] = letter;
  s[1] = 0;
  KeySym sym = XStringToKeysym(s);
  KeyCode keycode;



  if (sym == 0) {
    sym = letter;
  }


  if (sym == '\n') {
    sym = XK_Return;
    skip_lookup = 1;

  } else if (sym == '\t') {
    sym = XK_Tab;
    skip_lookup = 1;
  }

  keycode = XKeysymToKeycode(dpy, sym);
  if (keycode == 0) {
    sym = 0xff00 | letter;
    keycode = XKeysymToKeycode(dpy, sym);

  }

  if (!skip_lookup) {
    // Here we try to determine if a keysym
    // needs a modifier key (shift), such as a
    // shifted letter or symbol.
    // The second keysym should be the shifted char
    KeySym *syms;
    int keysyms_per_keycode;
    syms = XGetKeyboardMapping(dpy, keycode, 1, &keysyms_per_keycode);
    int i = 0;
    for (i = 0; i <= keysyms_per_keycode; i++) {
      if (syms[i] == 0)
        break;

      if (i == 0 && syms[i] != letter)
        upper = 1;


    }
  }

  if (upper)
    XTestFakeKeyEvent(dpy, shiftcode, True, 0); 


  XTestFakeKeyEvent(dpy, keycode, True, 0); 
  XTestFakeKeyEvent(dpy, keycode, False, 0);

  if (upper)
    XTestFakeKeyEvent(dpy, shiftcode, False, 0);  



}

static void press_keys(char* string) {
  int len = strlen(string);
  int i = 0;
  for (i = 0; i < len; i++) {
    xtest_key_press(string[i]);
  }
  XFlush(dpy);
}


int sw_open_serial(const char *port) {
  serialPort = open(port, O_RDONLY);
  if (serialPort < 0) {
    fprintf(stderr, "Can't open serial port: %s\n", port);
    exit(-1);
  }

  return 0;
}

void sw_init() {

  int xtest_major_version = 0;
  int xtest_minor_version = 0;
  int dummy;


  /*
   * Open the display using the $DISPLAY environment variable to locate
   * the X server.  See Section 2.1.
   */
  if ((dpy = XOpenDisplay(NULL)) == NULL) {
    fprintf(stderr, "%s: can't open %s\en", "softwedge", XDisplayName(NULL));
    exit(1);
  }

  Bool success = XTestQueryExtension(dpy, &dummy, &dummy,
                     &xtest_major_version, &xtest_minor_version);
  if(success == False || xtest_major_version < 2 ||
     (xtest_major_version <= 2 && xtest_minor_version < 2))
  {
    fprintf(stderr,"XTEST extension not supported. Can't continue\n");
    exit(1);
  }

}


void sw_read_loop() {

  char readbuf[2];
  readbuf[1] = 0;

  while(read(serialPort, readbuf, 1) > 0) {
    if (readbuf[0] == 0x02 || readbuf[0] == 0x03) 
      continue;
    press_keys(readbuf);
  }
  // We're done now
  close(serialPort);
}

文本输入未在C中的Keypress上传递给X11

0 个答案: