GetAsyncKeyState - if or while?

This is a discussion on GetAsyncKeyState - if or while? within the C Programming forums, part of the General Programming Boards category; Hey fellas, I just found out that this nifty little command would help me capture the ALT key in my ...

  1. #1
    Registered User johnnyd's Avatar
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    Lightbulb GetAsyncKeyState - if or while?

    Hey fellas, I just found out that this nifty little command would help me capture the ALT key in my program. Question is, how exactly do I use this command to capture the key?

    Lemme know if this makes sense:

    if (GetAsyncKeyState(VK_ALT))
    //do whatever

    Because, I'm thinking that I will have to setup a loop to actually catch the ALT keypress. Won't I? I mean it's not like getch() that will wait on the user to enter something. Something to the effect of:

    while (GetAsyncKeyState(VK_ALT))
    //do whatever

    Won't I? Or am I just typing nonsense here?

    MSDN doesn't show me any examples of it's usage in C. Thanks in advance.
    Excuse me, while I water my money tree.

  2. #2
    Has a Masters in B.S.
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    well whenever you test for input? test for alt of in the main program loop somewhere with the if form?
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  3. #3
    &TH of undefined behavior Fordy's Avatar
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    If you have windows proggie then capure WM_KEYDOWN and look for the proper Virtual code (I think its VK_MENU...but i may be wrong)...

    If you have a console then the way I prefer to do it is to setup a seperate thread to read the keyboard using ReadConsoleInput().....

  4. #4
    Registered User johnnyd's Avatar
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    You're right about the VK...

    I did know about the VK_MENU. You're quite right.

    My mind slipped me when I wrote VK_ALT, nonsense I tell you.

    I'm going to attempt the ReadConsoleInput. Is that also in Windows.h?
    Excuse me, while I water my money tree.

  5. #5
    &TH of undefined behavior Fordy's Avatar
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    Re: You're right about the VK...

    Originally posted by johnnyd

    I'm going to attempt the ReadConsoleInput. Is that also in Windows.h?
    Yup its a standard Windows function.......

  6. #6
    Registered User johnnyd's Avatar
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    GetKeyState(VK_MENU & 0x8000) ?

    I've seen some peeps use GetKeyState(VK_MENU & 0x8000) in their C code. What's the significance of the & 0x8000?
    Excuse me, while I water my money tree.

  7. #7
    Code Goddess Prelude's Avatar
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    >What's the significance of the & 0x8000?
    That determines if the most signifigant bit is set.

    -Prelude
    My best code is written with the delete key.

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