如何ASCII字符转换为CGKey code？ [英] How to convert ASCII character to CGKeyCode?
问题描述
我需要一个函数，给定一个字符，返回与该角色对当前的键盘布局的位置 CGKey code 相关。例如，考虑到B，它应该返回 kVK_ANSI_B 如果要是使用德沃夏克使用美国QWERTY或45。在Win32 API所具有的功能 VkKeyScan（） 用于此目的; X11所具有的功能<一个href=\"http://tronche.com/gui/x/xlib/utilities/keyboard/XStringToKeysym.html\"><$c$c>XStringToKeySym().是否有对CG API中这样的功能？
I need a function that, given a character, returns the CGKeyCode associated with the position of that character on the current keyboard layout. E.g., given "b", it should return kVK_ANSI_B if using U.S. QWERTY, or 45 if using Dvorak. The Win32 API has the function VkKeyScan() for this purpose; X11 has the function XStringToKeySym(). Is there such a function in the CG API?
我需要这一点是为了传递参数给<一个href=\"http://developer.apple.com/mac/library/documentation/Carbon/Reference/QuartzEventServicesRef/Reference/reference.html#//apple%5Fref/c/func/CGEventCreateKeyboardEvent\"><$c$c>CGEventCreateKeyboardEvent().我已经尝试使用<一个href=\"http://developer.apple.com/mac/library/documentation/Carbon/Reference/QuartzEventServicesRef/Reference/reference.html#//apple%5Fref/c/func/CGEventKeyboardSetUni$c$cString\"><$c$c>CGEventKeyboardSetUni$c$cString()相反，但是，显然不支持修饰符标志（我需要）。
I need this in order to pass a parameter to CGEventCreateKeyboardEvent(). I've tried using CGEventKeyboardSetUnicodeString() instead, but that apparently does not support modifier flags (which I need).
我已经广泛地搜索了这一点，但无法找到一个像样的答案。目前我使用下面的code（在网上找到），其工作方式，但不完全是优雅的（而难以破译如何简化），我会preFER不要在生产code使用它：
I have searched extensively for this but cannot find a decent answer. Currently I am using the following code (found online), which works, but is not exactly elegant (and rather difficult to decipher how to simplify) and I would prefer not to use it in production code:
#include <stdint.h>
#include <stdio.h>
#include <ApplicationServices/ApplicationServices.h>
CGKeyCode keyCodeForCharWithLayout(const char c,
const UCKeyboardLayout *uchrHeader);
CGKeyCode keyCodeForChar(const char c)
{
CFDataRef currentLayoutData;
TISInputSourceRef currentKeyboard = TISCopyCurrentKeyboardInputSource();
if (currentKeyboard == NULL) {
fputs("Could not find keyboard layout\n", stderr);
return UINT16_MAX;
}
currentLayoutData = TISGetInputSourceProperty(currentKeyboard,
kTISPropertyUnicodeKeyLayoutData);
CFRelease(currentKeyboard);
if (currentLayoutData == NULL) {
fputs("Could not find layout data\n", stderr);
return UINT16_MAX;
}
return keyCodeForCharWithLayout(c,
(const UCKeyboardLayout *)CFDataGetBytePtr(currentLayoutData));
}
/* Beware! Messy, incomprehensible code ahead!
* TODO: XXX: FIXME! Please! */
CGKeyCode keyCodeForCharWithLayout(const char c,
const UCKeyboardLayout *uchrHeader)
{
uint8_t *uchrData = (uint8_t *)uchrHeader;
UCKeyboardTypeHeader *uchrKeyboardList = uchrHeader->keyboardTypeList;
/* Loop through the keyboard type list. */
ItemCount i, j;
for (i = 0; i < uchrHeader->keyboardTypeCount; ++i) {
/* Get a pointer to the keyToCharTable structure. */
UCKeyToCharTableIndex *uchrKeyIX = (UCKeyToCharTableIndex *)
(uchrData + (uchrKeyboardList[i].keyToCharTableIndexOffset));
/* Not sure what this is for but it appears to be a safeguard... */
UCKeyStateRecordsIndex *stateRecordsIndex;
if (uchrKeyboardList[i].keyStateRecordsIndexOffset != 0) {
stateRecordsIndex = (UCKeyStateRecordsIndex *)
(uchrData + (uchrKeyboardList[i].keyStateRecordsIndexOffset));
if ((stateRecordsIndex->keyStateRecordsIndexFormat) !=
kUCKeyStateRecordsIndexFormat) {
stateRecordsIndex = NULL;
}
} else {
stateRecordsIndex = NULL;
}
/* Make sure structure is a table that can be searched. */
if ((uchrKeyIX->keyToCharTableIndexFormat) != kUCKeyToCharTableIndexFormat) {
continue;
}
/* Check the table of each keyboard for character */
for (j = 0; j < uchrKeyIX->keyToCharTableCount; ++j) {
UCKeyOutput *keyToCharData =
(UCKeyOutput *)(uchrData + (uchrKeyIX->keyToCharTableOffsets[j]));
/* Check THIS table of the keyboard for the character. */
UInt16 k;
for (k = 0; k < uchrKeyIX->keyToCharTableSize; ++k) {
/* Here's the strange safeguard again... */
if ((keyToCharData[k] & kUCKeyOutputTestForIndexMask) ==
kUCKeyOutputStateIndexMask) {
long keyIndex = (keyToCharData[k] & kUCKeyOutputGetIndexMask);
if (stateRecordsIndex != NULL &&
keyIndex <= (stateRecordsIndex->keyStateRecordCount)) {
UCKeyStateRecord *stateRecord = (UCKeyStateRecord *)
(uchrData +
(stateRecordsIndex->keyStateRecordOffsets[keyIndex]));
if ((stateRecord->stateZeroCharData) == c) {
return (CGKeyCode)k;
}
} else if (keyToCharData[k] == c) {
return (CGKeyCode)k;
}
} else if (((keyToCharData[k] & kUCKeyOutputTestForIndexMask)
!= kUCKeyOutputSequenceIndexMask) &&
keyToCharData[k] != 0xFFFE &&
keyToCharData[k] != 0xFFFF &&
keyToCharData[k] == c) {
return (CGKeyCode)k;
}
}
}
}
return UINT16_MAX;
}
是否有一个。）（preferably）我俯瞰一个标准的功能，或b。）（几乎可以肯定）更优雅的方式写我自己？
Is there a.) (preferably) a standard function I am overlooking, or b.) (almost certainly) a more elegant way write my own?
推荐答案
这是我最终使用。干净多了。
This is what I ended up using. Much cleaner.
#include <CoreFoundation/CoreFoundation.h>
#include <Carbon/Carbon.h> /* For kVK_ constants, and TIS functions. */
/* Returns string representation of key, if it is printable.
* Ownership follows the Create Rule; that is, it is the caller's
* responsibility to release the returned object. */
CFStringRef createStringForKey(CGKeyCode keyCode)
{
TISInputSourceRef currentKeyboard = TISCopyCurrentKeyboardInputSource();
CFDataRef layoutData =
TISGetInputSourceProperty(currentKeyboard,
kTISPropertyUnicodeKeyLayoutData);
const UCKeyboardLayout *keyboardLayout =
(const UCKeyboardLayout *)CFDataGetBytePtr(layoutData);
UInt32 keysDown = 0;
UniChar chars[4];
UniCharCount realLength;
UCKeyTranslate(keyboardLayout,
keyCode,
kUCKeyActionDisplay,
0,
LMGetKbdType(),
kUCKeyTranslateNoDeadKeysBit,
&keysDown,
sizeof(chars) / sizeof(chars[0]),
&realLength,
chars);
CFRelease(currentKeyboard);
return CFStringCreateWithCharacters(kCFAllocatorDefault, chars, 1);
}
/* Returns key code for given character via the above function, or UINT16_MAX
* on error. */
CGKeyCode keyCodeForChar(const char c)
{
static CFMutableDictionaryRef charToCodeDict = NULL;
CGKeyCode code;
UniChar character = c;
CFStringRef charStr = NULL;
/* Generate table of keycodes and characters. */
if (charToCodeDict == NULL) {
size_t i;
charToCodeDict = CFDictionaryCreateMutable(kCFAllocatorDefault,
128,
&kCFCopyStringDictionaryKeyCallBacks,
NULL);
if (charToCodeDict == NULL) return UINT16_MAX;
/* Loop through every keycode (0 - 127) to find its current mapping. */
for (i = 0; i < 128; ++i) {
CFStringRef string = createStringForKey((CGKeyCode)i);
if (string != NULL) {
CFDictionaryAddValue(charToCodeDict, string, (const void *)i);
CFRelease(string);
}
}
}
charStr = CFStringCreateWithCharacters(kCFAllocatorDefault, &character, 1);
/* Our values may be NULL (0), so we need to use this function. */
if (!CFDictionaryGetValueIfPresent(charToCodeDict, charStr,
(const void **)&code)) {
code = UINT16_MAX;
}
CFRelease(charStr);
return code;
}
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