我需要一个函数，根据给定的字符返回该字符在当前键盘布局中所对应的
Win32 API 中拥有
我需要这个函数是为了将其作为参数传递给
CGKeyCode。例如，如果使用美国QWERTY，则针对字母"b"应该返回kVK_ANSI_B，而如果使用Dvorak，则应该返回kVK_ANSI_N。Win32 API 中拥有
VkKeyScan() 函数可实现此功能；X11 中则有 XStringToKeySym() 函数。请问 CG API 是否有类似的函数？我需要这个函数是为了将其作为参数传递给
CGEventCreateKeyboardEvent()。我已经尝试使用 CGEventKeyboardSetUnicodeString()，但它显然不支持修饰键（而我恰好需要支持修饰键）。
我已经进行了广泛的搜索，但是找不到一个合适的答案。目前我正在使用下面这段代码（在网上找到），它能够工作，但并不十分优雅（而且很难理解如何简化），我希望在生产代码中不使用它：
#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;
}
我是否可以使用标准函数（最好）或编写自己的更优雅的方法（几乎肯定）来解决这个问题？