c++ MFC中，如何响应键盘按键

[abchina]

我点了 右键 event 里面找到一个 WM_KEYDOWN,在生成的代码中

 
void CTestDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
CDialog::OnKeyDown(nChar, nRepCnt, nFlags); 
} 

都不知道怎么用！～

希望各位能提供个好办法，希望提供一个详细而简单的例子～～

[hslinux]

晕，你想干吗先？

键盘按下了就进入这个函数了，你想干吗就干吗。

[hityct1]

什么意思？用重载OnChar也可。

[神一样的熊猫酒仙]

case WM_KEYDOWN:
		if (wParam==VK_LEFT)//方向键左
		{
			rect1.left-=10;
			rect1.right-=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_RIGHT)//方向键右
		{
			rect1.left+=10;
			rect1.right+=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_UP)//方向键上
		{
			rect1.top-=10;
			rect1.bottom-=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_DOWN)//方向键下
		{
			rect1.top+=10;
			rect1.bottom+=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_PRIOR)//PG UP
		{
			rect1.top-=10;
			rect1.bottom-=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_NEXT)//PG DN
		{
			rect1.top+=10;
			rect1.bottom+=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_HOME)//HOME
		{
			rect1.left-=10;
			rect1.right-=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		else if (wParam==VK_END)//END
		{
			rect1.left+=10;
			rect1.right+=10;
			InvalidateRect (hWnd,NULL,TRUE);
		}
		break;

以前写的一个程序.

[kakaying]

一下内容copy自msdn
MFC函数OnKeyDown()参数说明：
nChar
Specifies the virtual key code of the given key. For a list of of standard virtual key codes, see Winuser.h

nRepCnt
Repeat count (the number of times the keystroke is repeated as a result of the user holding down the key).

nFlags
Specifies the scan code, key-transition code, previous key state, and context code, as shown in the following list:

Value Description
0–7
Scan code (OEM-dependent value).

8
Extended key, such as a function key or a key on the numeric keypad (1 if it is an extended key).

9–10
Not used.

11–12
Used internally by Windows.

13
Context code (1 if the ALT key is held down while the key is pressed; otherwise 0).

14
Previous key state (1 if the key is down before the call, 0 if the key is up).

15
Transition state (1 if the key is being released, 0 if the key is being pressed).


For a WM_KEYDOWN message, the key-transition bit (bit 15) is 0 and the context-code bit (bit 13) is 0.


WM_KEYDOWN消息参数说明：

wParam
Specifies the virtual-key code of the nonsystem key.
lParam
Specifies the repeat count, scan code, extended-key flag, context code, previous key-state flag, and transition-state flag, as shown in the following table.
0-15
Specifies the repeat count for the current message. The value is the number of times the keystroke is autorepeated as a result of the user holding down the key. If the keystroke is held long enough, multiple messages are sent. However, the repeat count is not cumulative.
16-23
Specifies the scan code. The value depends on the OEM.
24
Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0.
25-28
Reserved; do not use.
29
Specifies the context code. The value is always 0 for a WM_KEYDOWN message.
30
Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is zero if the key is up.
31
Specifies the transition state. The value is always zero for a WM_KEYDOWN message.


知道这些信息，就可以为所欲为了

[herman~~]

键盘按下了就进入这个函数了

[花花呀123456]

就在这个函数里面添加你想要做的就行了。。。。。
先把消息机制看看吧！

[abchina]

终于可以响应啦，但是我发现如果焦点在button上就怎么按键都没用啦，用什么方法可以使消息可以从button上传到它的父窗体上呢？
[Quote=引用 7 楼 genghaolove 的回复:]
void CMainFrame::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
switch(nChar)
{
case VK_RETURN:
SetWindowText("You pressed Enter");
break;
case VK_F1:
SetWindowText("Help is not available at the moment");
break;
case VK_DELETE:
SetWindowText("Can't Delete This");
break;
default:
SetWindowText("Whatever");
}
}
[/Quote]

[genghaolove]

void CMainFrame::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
switch(nChar)
{
case VK_RETURN:
SetWindowText("You pressed Enter");
break;
case VK_F1:
SetWindowText("Help is not available at the moment");
break;
case VK_DELETE:
SetWindowText("Can't Delete This");
break;
default:
SetWindowText("Whatever");
}
}

[abchina]

终于可以响应啦，但是我发现如果焦点在button上就怎么按键都没用啦，用什么方法可以使消息可以从button上传到它的父窗体上呢？

[飞雁]

学习了不少有关MFC的知识，谢谢大家！