11

我只是想获取一个 KeyCode 和一个修饰符掩码，并使用 Xkb 扩展名将其转换为 KeySym。我似乎无法弄清楚为什么这不起作用。很明显修饰符不匹配，但我不知道为什么。我什至不知道我是否正确转换了组。 

#include <stdio.h>
#include <stdlib.h>
#include <X11/X.h>
#include <X11/XKBlib.h>

void check(XkbDescPtr keyboard_map, KeyCode keycode, unsigned int mask) {
    //What the hell is diff between XkbKeyGroupInfo and XkbKeyNumGroups?
    unsigned char info = XkbKeyGroupInfo(keyboard_map, keycode);
    int num_groups = XkbKeyNumGroups(keyboard_map, keycode);

    int key_width = XkbKeyGroupsWidth(keyboard_map, keycode);
    //int num_syms = XkbKeyNumSyms(keyboard_map, keycode);

    //Get the group
    unsigned int group = 0; // What should this default to?
    switch (XkbOutOfRangeGroupAction(info)) {
        case XkbRedirectIntoRange:
            /* If the RedirectIntoRange flag is set, the four least significant 
            * bits of the groups wrap control specify the index of a group to 
            * which all illegal groups correspond. If the specified group is 
            * also out of range, all illegal groups map to Group1.
            */
            printf("XkbRedirectIntoRange\n");
            group = XkbOutOfRangeGroupInfo(info);
            if (group >= num_groups) {
                group = 0;
            }
        break;

        case XkbClampIntoRange:
            /* If the ClampIntoRange flag is set, out-of-range groups correspond 
            * to the nearest legal group. Effective groups larger than the 
            * highest supported group are mapped to the highest supported group; 
            * effective groups less than Group1 are mapped to Group1 . For 
            * example, a key with two groups of symbols uses Group2 type and 
            * symbols if the global effective group is either Group3 or Group4.
            */
            printf("XkbClampIntoRange\n");
            group = num_groups - 1;
        break;

        case XkbWrapIntoRange:
            /* If neither flag is set, group is wrapped into range using integer 
            * modulus. For example, a key with two groups of symbols for which 
            * groups wrap uses Group1 symbols if the global effective group is 
            * Group3 or Group2 symbols if the global effective group is Group4.
            */
            printf("XkbWrapIntoRange\n");
        default:
            printf("Default\n");
            if (num_groups != 0) {
                group %= num_groups;
            }
        break;
    }
    printf("Group Info %d, %d, %d\n", group, num_groups, key_width);
    //printf("Mask Info %d, %d, %d, %d, %d, %d, %d, %d\n", ShiftMask, LockMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask);

    XkbKeyTypePtr key_type = XkbKeyKeyType(keyboard_map, keycode, group);

    KeySym keysym = NoSymbol;
    int i;
    for (i = 0; i < key_type->map_count; i++) {
        if (key_type->map[i].active &&  key_type->map[i].mods.mask == mask) {
            keysym = XkbKeySymEntry(keyboard_map, keycode, i, group);
        }
    }

    //printf("%s\n", XKeysymToString(keysym));
    printf("KeyCode: %d\n", (int) keycode);
    printf("KeySym:  %d\n", (int) keysym);
}

int main(int argc, const char * argv[]) {
    Display * display;

    //Try to attach to the default X11 display.
    display = XOpenDisplay(NULL);
    if(display == NULL) {
        printf("Error: Could not open display!\n");
        return EXIT_FAILURE;
    }

    //Get the map
    XkbDescPtr keyboard_map = XkbGetMap(display, XkbAllClientInfoMask, XkbUseCoreKbd);

    KeyCode keycode = 56; // b
    check(keyboard_map, keycode, ShiftMask | LockMask | ControlMask);

    //Close the connection to the selected X11 display.
    XCloseDisplay(display);

    return EXIT_SUCCESS;
}
4

2 回答 2

9

经过大量的反复试验，我终于能够弄清楚。XKeycodeToKeysym 显然已损坏，并且未为扩展索引定义索引值计算。

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/X.h>
#include <X11/XKBlib.h>

KeySym KeyCodeToKeySym(Display * display, KeyCode keycode, unsigned int event_mask) {
    KeySym keysym = NoSymbol;

    //Get the map
    XkbDescPtr keyboard_map = XkbGetMap(display, XkbAllClientInfoMask, XkbUseCoreKbd);
    if (keyboard_map) {
        //What is diff between XkbKeyGroupInfo and XkbKeyNumGroups?
        unsigned char info = XkbKeyGroupInfo(keyboard_map, keycode);
        unsigned int num_groups = XkbKeyNumGroups(keyboard_map, keycode);

        //Get the group
        unsigned int group = 0x00;
        switch (XkbOutOfRangeGroupAction(info)) {
            case XkbRedirectIntoRange:
                /* If the RedirectIntoRange flag is set, the four least significant
                 * bits of the groups wrap control specify the index of a group to
                 * which all illegal groups correspond. If the specified group is
                 * also out of range, all illegal groups map to Group1.
                 */
                group = XkbOutOfRangeGroupInfo(info);
                if (group >= num_groups) {
                    group = 0;
                }
            break;

            case XkbClampIntoRange:
                /* If the ClampIntoRange flag is set, out-of-range groups correspond
                 * to the nearest legal group. Effective groups larger than the
                 * highest supported group are mapped to the highest supported group;
                 * effective groups less than Group1 are mapped to Group1 . For
                 * example, a key with two groups of symbols uses Group2 type and
                 * symbols if the global effective group is either Group3 or Group4.
                 */
                group = num_groups - 1;
            break;

            case XkbWrapIntoRange:
                /* If neither flag is set, group is wrapped into range using integer
                 * modulus. For example, a key with two groups of symbols for which
                 * groups wrap uses Group1 symbols if the global effective group is
                 * Group3 or Group2 symbols if the global effective group is Group4.
                 */
            default:
                if (num_groups != 0) {
                    group %= num_groups;
                }
            break;
        }

        XkbKeyTypePtr key_type = XkbKeyKeyType(keyboard_map, keycode, group);
        unsigned int active_mods = event_mask & key_type->mods.mask;

        int i, level = 0;
        for (i = 0; i < key_type->map_count; i++) {
            if (key_type->map[i].active && key_type->map[i].mods.mask == active_mods) {
                level = key_type->map[i].level;
            }
        }

        keysym = XkbKeySymEntry(keyboard_map, keycode, level, group);
        XkbFreeClientMap(keyboard_map, XkbAllClientInfoMask, true);
    }

    return keysym;
}

int main(int argc, const char * argv[]) {
    Display * display;

    //Try to attach to the default X11 display.
    display = XOpenDisplay(NULL);
    if(display == NULL) {
        printf("Error: Could not open display!\n");
        return EXIT_FAILURE;
    }

    KeyCode keycode = 56; // b
    unsigned int event_mask = ShiftMask | LockMask;
    KeySym keysym = KeyCodeToKeySym(display, keycode, event_mask);

    printf("KeySym: %s\n", XKeysymToString(keysym));

    //Close the connection to the selected X11 display.
    XCloseDisplay(display);

    return EXIT_SUCCESS;
}
于 2012-04-19T17:44:03.403 回答
0

从手册页XKeycodeToKeysym：

   The XKeycodeToKeysym function uses internal Xlib tables and returns the
   KeySym defined for the specified KeyCode and the element of the KeyCode
   vector.  If no symbol is defined, XKeycodeToKeysym returns NoSymbol.
   XKeycodeToKeysym predates the XKB extension. If you want to lookup a
   KeySym while using XKB you have to use XkbKeycodeToKeysym.

我在您的示例代码中看不到这一点。

阅读完整的手册页以获取更多信息。

于 2012-04-15T16:21:00.930 回答