win32上的异步键盘输入
我正在 Windows 7 上使用免费版本的 Havok 物理引擎用 C++ 创建一个简单的 3D 游戏。我想使用 WASD 键来移动角色。代码的结构是这样的，我需要异步捕获这个输入；场景的每一帧都会调用一个函数来更新角色的位置（我想尝试检查当前是否按下了某个键，而不是使用某种事件侦听器）。我四处寻找一个好的解决方案，因为我对 win32 函数知之甚少，并将其放在一起：
if (GetAsyncKeyState(0x41) & 0x8000) posX=-1.0f; //A
if (GetAsyncKeyState(0x44) & 0x8000) posX=1.0f; //D
if (GetAsyncKeyState(0x57) & 0x8000) posX=1.0f; //W
if (GetAsyncKeyState(0x53) & 0x8000) posX=-1.0f; //S
在检查了一些 printf 语句后，可视化调试器似乎没有拾取任何输入。我知道 WM_KEYDOWN 和 WM_KEYUP，但我找不到如何使用它们的简单解释，据我所知，它们更多是基于事件的而不是异步的。
上面的代码片段有问题吗？或者我应该尝试其他方法？
I'm creating a simple 3D game on Windows 7 in C++ using the free version of the Havok physics engine. I want to use the WASD keys to move the character. The structure of the code is such that I need to capture this input asychronously; there is a function called in every frame of the scene to update the character's position (I want to try checking if a key is currently pressed instead of using some kind of listener for events). I searched around for a good solution, as I know little to nothing about win32 functions, and put this together:
if (GetAsyncKeyState(0x41) & 0x8000) posX=-1.0f; //A
if (GetAsyncKeyState(0x44) & 0x8000) posX=1.0f; //D
if (GetAsyncKeyState(0x57) & 0x8000) posX=1.0f; //W
if (GetAsyncKeyState(0x53) & 0x8000) posX=-1.0f; //S
After checking with some printf statements, the visual debugger doesn't seem to be picking up any input with this. I know of WM_KEYDOWN and WM_KEYUP, but I can't find simple explanations on how to use them, and as far as I can tell they are more event-based than asynchronous.
Is there a problem with the snippet above, or should I try another approach?
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最佳猜测：您正在检查“
A”而不是“a”。当然，除非您也按住 Shift 键，否则仅按 a 键不会触发您的代码。Best guess: You're checking for "
A" instead of "a". Unless of course you hold down the shift key as well, just pressing the a-key won't trigger your code.看来我的问题毕竟不是 GetAsyncKeyState() ，而是我对 FindWindow() 和 GetWindowRect() 的使用。它无法识别当前窗口是可视化调试器。固定的。
It appears that my problem wasn't GetAsyncKeyState() after all, but my use of FindWindow() and GetWindowRect(). It wasn't recognizing that the current window was the visual debugger. Fixed.