将字符转换为键盘码的代码

以下这段代码可以将字符串转换为键盘码，以备需要时用到。

- (int)keyCodeForCharacter: (NSString*)character {  if(![character length]) return -1; char code;  BOOL shift, alt; if(Ascii2Virtual( (char)[character characterAtIndex: 0], &shift, &alt, &code)) {return code;}  return -1;}

BOOL Ascii2Virtual(char pcar, BOOL *pshift, BOOL *palt, char *pkeycode){    KeyboardLayoutRef keyboard;    const void *keyboardData; // keyboard layout data    UInt16 nbblocs;    char *modblocs, *blocs, *deadkeys;    int ix, ifin, numbloc, keycode;       BOOL shift, alt;    // get the current keyboard    if(KLGetCurrentKeyboardLayout(&keyboard)) return NO;    // get the description of the current keyboard layout    if(KLGetKeyboardLayoutProperty(keyboard, kKLKCHRData, &keyboardData)) return NO;    // get pointer early numbers of blocks for each combination of modifiers    modblocs = ((char *)keyboardData) + 2;    // get number of blocks keycode->ascii    nbblocs = *((UInt16 *)(keyboardData + 258));    // get pointer early blocks keycode-> ascii    blocs = ((char *)keyboardData) + 260;    // determining the size of all tables keycode-> ascii a scanner    ifin = nbblocs*128;    // determining pointer early in the tables of dead keys    deadkeys = blocs+ifin;    // Now it runs blocks keycode-> ascii to find the car ascii    for (ix=0; ix<ifin ; ix++)    {        if (blocs[ix]==pcar)        {             // found ascii value: now we must determine which block it is            keycode = ix & 0×7f; // 0111 1111 mask            numbloc = ix >> 7;            break;        }    }     // not found: bail out (error)    if (ix >= ifin) return NO;     // from block number, we must find the combination of modifiers using this block    for (ix=0; ix<15; ix++)    {        // it does not address whether the modifiers are not "capital" and "option"        if (ix&1 || ix&4) continue;        // Combining modifiers found for the block        if (modblocs[ix]==numbloc)        {            shift = (ix&2) ? YES : NO;            alt   = (ix&8) ? YES : NO;            break;                }    }    // combination modifiers not found: bail    if (ix>=15) return NO;    // save our parameters    *pkeycode=keycode;    *pshift=shift;    *palt=alt;       return YES;}