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Using GetKeys

Posted on 1997-01-04
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Last Modified: 2013-12-26
I need to know how to use GetKeys in a program made in C. How can I get individual keys? Useualy It just returns them all mixed up. ie:1 0 0 0 0 0 0 0 would be 8 elements of an aray.10000000 is how it gets returned. 8 bits instead of 8 elements.
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Question by:simap
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Accepted Solution

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gregj earned 100 total points
ID: 1291753
Usually what you need from GetKeys is to find out if a specific key is pressed. You need the key scan code, which are documented in Inside Macintosh (Event Manager) and Think Reference.

There is a complete explanation of the keymap structure in Inside Macintosh.

This function is what I and most everyone else uses:



Boolean IsKeyDown(unsigned short scancode )
{
      unsigned char keymap[16];

      GetKeys( (long *) keymap);
      return ( ( keymap[scancode>>3] >> (scancode & 7) ) & 1);
}


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