What are the ascii values of up down left right

Question

What are the ASCII values of the arrow keys   up down left right

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Really the answer to this question depends on what operating system and programming language you are using  There is no  ASCII code  per se  The operating system detects you hit an arrow key and triggers an event that programs can capture  For example  on modern Windows machines  you would get a WM KEYUP or WM KEYDOWN event  It passes a 16-bit value usually to determine which key was pushed

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Gaa  Go to asciitable com  The arrow keys are the control equivalent of the HJKL keys  I e   in vi create a big block of text  Note you can move around in that text using the HJKL keys  The arrow keys are going to be  H   J   K   L   At asciitable com find   K  in the third column  Now  look at the same row in the first column to find the matching control-code   VT  in this case

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There is no real ascii codes for these keys as such  you will need to check out the scan codes for these keys  known as Make and Break key codes as per helppc s information  The reason the codes sounds  ascii  is because the key codes are handled by the old BIOS interrupt 0x16 and keyboard interrupt 0x9                      Normal Mode            Num lock on                  Make    Break        Make          Break Down arrow       E0 50   E0 D0     E0 2A E0 50   E0 D0 E0 AA Left arrow       E0 4B   E0 CB     E0 2A E0 4B   E0 CB E0 AA Right arrow      E0 4D   E0 CD     E0 2A E0 4D   E0 CD E0 AA Up arrow         E0 48   E0 C8     E0 2A E0 48   E0 C8 E0 AA   Hence by looking at the codes following E0 for the Make key code  such as 0x50  0x4B  0x4D  0x48 respectively  that is where the confusion arise from looking at key-codes and treating them as  ascii     the answer is don t as the platform varies  the OS varies  under Windows it would have virtual key code corresponding to those keys  not necessarily the same as the BIOS codes  VK UP  VK DOWN  VK LEFT  VK RIGHT   this will be found in your C   s header file windows h  as I recall in the SDK s include folder   Do not rely on the key-codes to have the same  identical ascii  codes shown here as the Operating system will reprogram the entire BIOS code in whatever the OS sees fit  naturally that would be expected because since the BIOS code is 16bit  and the OS  nowadays are 32bit protected mode   of course those codes from the BIOS will no longer be valid   Hence the original keyboard interrupt 0x9 and BIOS interrupt 0x16 would be wiped from the memory after the BIOS loads it and when the protected mode OS starts loading  it would overwrite that area of memory and replace it with their own 32 bit protected mode handlers to deal with those keyboard scan codes   Here is a code sample from the old days of DOS programming  using Borland C v3     include  lt bios h gt  int getKey void       int key  lo  hi      key   bioskey 0       lo   key  amp  0x00FF      hi    key  amp  0xFF00   gt  gt  8      return  lo    0    hi   256   lo      This routine actually  returned the codes for up  down is 328 and 336 respectively   I do not have the code for left and right actually  this is in my old cook book   The actual scancode is found in the lo variable  Keys other than the A-Z 0-9  had a scan code of 0 via the bioskey routine     the reason 256 is added  because variable lo has code of 0 and the hi variable would have the scan code and adds 256 on to it in order not to confuse with the  ascii  codes

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The ascii values of the    Up key - 224           72 Down key - 224             80 Left key - 224             75 Right key - 224              77   Each of these has two integer values for ascii value  because they are special keys  as opposed to the code for    which is simply 36  These 2 byte special keys usually have the first digit as either 224  or 0  this can be found with the F  in windows  or the delete key    EDIT   This may actually be unicode looking back  but they do work

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this is what i get   Left - 19 Up - 5 Right - 4 Down - 24  Works in Visual Fox Pro

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In short   left arrow  37 up arrow  38right arrow  39down arrow  40

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You can check it by compiling and running this small C   program    include  lt iostream gt   include  lt conio h gt   include  lt cstdlib gt   int show  int main         while true            int show   getch        std  cout  lt  lt  show        getch       Just to keep the console open after program execution

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You can utilzed the special function for activating the navigation for your programming purpose  Below is the sample code for it      void Specialkey int key  int x  int y            switch key            case GLUT KEY UP     Do whatever you want                    break       case GLUT KEY DOWN     Do whatever you want                    break      case GLUT KEY LEFT    Do whatever you want                    break      case GLUT KEY RIGHT    Do whatever you want                    break             glutPostRedisplay            Add this to your main function  glutSpecialFunc Specialkey     Hope this will to solve the problem

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The Ascii codes for arrow characters are the following    24   25   26   27

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If you re programming in OpenGL  use GLUT   The following page should help  http   www lighthouse3d com opengl glut index php 5  GLUT KEY LEFT   Left function key GLUT KEY RIGHT  Right function key GLUT KEY UP     Up function key GLUT KEY DOWN   Down function key    nbsp   void processSpecialKeys int key  int x  int y     switch key        case GLUT KEY F1                red   1 0               green   0 0               blue   0 0  break      case GLUT KEY F2                red   0 0               green   1 0               blue   0 0  break      case GLUT KEY F3                red   0 0               green   0 0               blue   1 0  break

[hardware] What are the ascii values of up down left right?

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