WM_KEYDOWN-捕获按键事件 [英] WM_KEYDOWN - capturing keypress causing event
问题描述
我正在尝试做一个非常简单的任务-按下某个键时会发生一个事件-但是实现它有很多困难.
I am trying to do a very simple task - have an event occur when a key is pressed - but am having a lot of difficulty implementing it.
我正在使用Win32 API.我被问到我正在使用什么框架,但我不知道.我正在使用Visual C ++,该程序是Windows程序.
I am using the Win32 API. I have been asked what framework I am using but I don't know that. I am using Visual C++ and the program is a Windows program.
我要做的就是如果按下特定的键,就会发生一个事件.在本例中,我使用's'键,并且该事件是一个整数,可以设置为1或0;不论在按键时未设置为哪个(我会使用bool,但我尚不知道它是如何工作的.).
All I want to do is have an event occur if a specific key is pressed. For this example I am using the 's' key, and the event is an integer either being set to 1 or 0; whichever it wasn't set to at the time of the key press (I would use bool but I don't know how it works just yet).
有人告诉我使用GetKeyState(),然后告诉我这实际上是不好的.我还被告知要使用WM_KEYDOWN,但无法弄清楚它是如何工作的.当然,我要做的必须是绝对的基本编程(键盘输入>输出),但是我无法对其工作方式有一个清晰的解释. ?!
I have been told to use GetKeyState(), and then told that this is actually no good. I have also been told to use WM_KEYDOWN but can't work out how this works... Surely what I am doing must be absolute basic programming (keyboard input > output) but I can't get a clear explanation as to how it works?!
我尝试使用以下方法,但没有运气:
I have tried using the following, with no luck:
int Flag;
if (GetKeyState(115) == 1 && Flag == 0) Flag = 1;
if (GetKeyState(115) == 1 && Flag == 1) Flag = 0;
我也尝试过使用它:
if (GetKeyState(115) & 0x8000 && Flag == 0) Flag = 1;
if (GetKeyState(115) & 0x8000 && Flag == 1) Flag = 0;
均无效.有谁知道我该如何实现WM_KEYDOWN?
Neither work. Does anyone know how I could implement WM_KEYDOWN?
我正在使用Windows消息循环
I am using a Windows Message Loop
推荐答案
有几种方法可以解决此问题.没有一个会给您纳秒"的精度,但是在这里.
There are several ways to solve this problem. None of which will give you "nano-second" accuracy but here they are.
如果希望活动窗口或对话框接收按键,则即使在对话框/窗口的WINPROC中也要处理WM_KEYDOWN.
If you want the keypress to be recieved by an active window or dialog you handle a WM_KEYDOWN even in the WINPROC of the dialog/window like so.
void InSomePlace()
{
WNDCLASS wndClass
ZeroMemory( &wndClass, sizeof(wndClass) );
// Initialize wndClass members here
wndClass.lpszClassName = _T("MyWindow");
wndClass.lpfnWndProc = &MyWndProcHandler; //
RegisterClass( &wndClass );
HWND hWnd = CreateWindow( _T("MyWindow", /* lots of other parameters */ );
MSG msg;
BOOL bRet;
while ( (bRet = GetMessage( &msg, hWnd, 0, 0 )) != 0 )
{
if (bRet == -1)
{
// handle the error and possibly exit
}
else
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
LRESULT CALLBACK MyWndProcHandler( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
switch ( uMsg )
{
// Lots of case statements, in particular you want a WM_KEYDOWN case
case WM_KEYDOWN:
if ( wParam == 'S' )
{
// Do something here
return 0L;
}
break;
}
return DefWindowProc( hwnd, uMsg, wParam, lParam );
}
对于非常相似的DialogBox,您仍然会有DLGPROC作为最后一个参数传递给DialogBox/CreateDialog
For a DialogBox its very similar, you would still have a DLGPROC which is passed as the last parameter to DialogBox/CreateDialog
void InSomePlace( HINSTANCE hInstance, HWND hParentWindow )
{
DialogBox( hInstance, _T("MyDialogTemplate"), hParentWindow, &MyDialogProc );
}
INT_PTR CALLBACK MyDialogProc( HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
case ( uMsg )
{
// Lots of case statements, in particular you want a WM_KEYDOWN case
case WM_KEYDOWN:
if ( wParam == 'S' )
{
// Do something here
SetWindowLong(hwndDlg, DWL_MSGRESULT, 0L);
return TRUE;
}
break;
}
return FALSE;
}
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