c++ - Why does the slash key "/" not have an ASCII value of 47? -


i have reassigned hotkey in our game use slash key "/", according ascii table should have value of 47. it's not firing. fires other standard keys. when step through code see keyeventrecord shows key value 191 or 111 if use slash on numeric keyboard. why so? need convert somehow?

just clarification, store key value int.

keyboards not know ascii. know scan codes, vendor-specific ids actual keys.

when processed, scan codes normalized in vendor-independent virtual key codes. 191 vk_oem_2 (used /? key in keyboards) , 111 vk_divide.

when dispatched ui windows, virtual key codes converted character codes in wm_char , wm_unichar messages. these human-readable characters, such ascii characters (though wm_char presents characters in ansi/utf-16 encoding, , wm_unichar in utf-32 encoding).

so, processing keyboard events, such wm_keydown/up or readconsoleinput(), reporting virtual key codes when expecting character codes instead.

for many ascii characters, virtual key code , character code same value, eg:

#define vk_back           0x08 #define vk_tab            0x09 #define vk_return         0x0d #define vk_space          0x20  /*  * vk_0 - vk_9 same ascii '0' - '9' (0x30 - 0x39)  * vk_a - vk_z same ascii 'a' - 'z' (0x41 - 0x5a)  */

however, other ascii characters, virtual key code , character code have different values, eg:

#define vk_oem_1          0xba   // ';:' #define vk_oem_plus       0xbb   // '+' country #define vk_oem_comma      0xbc   // ',' country #define vk_oem_minus      0xbd   // '-' country #define vk_oem_period     0xbe   // '.' country #define vk_oem_2          0xbf   // '/?' #define vk_oem_3          0xc0   // '`~' #define vk_oem_4          0xdb  //  '[{' #define vk_oem_5          0xdc  //  '\|' #define vk_oem_6          0xdd  //  ']}' #define vk_oem_7          0xde  //  ''"'

read msdn more information:

about keyboard input


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