关于WM_KEYDOWN The WM_KEYDOWN message is posted to the window with the keyboard focus when a nonsystem key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed. A window receives this message through its WindowProc function. LRESULT CALLBACK WindowProc( HWND hwnd, // handle to window UINT uMsg, // WM_KEYDOWN WPARAM wParam, // virtual-key code LPARAM lParam // key data ); Parameters 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. Value Description 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 original equipment manufacturer (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.
kb_event 必须要激活窗口,我只想知道用 SendMessage 或 PostMessage 发送键盘消息!
The WM_KEYDOWN message is posted to the window with the keyboard focus when a nonsystem key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed. A window receives this message through its WindowProc function. LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // WM_KEYDOWN
WPARAM wParam, // virtual-key code
LPARAM lParam // key data
);
Parameters
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. Value Description
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 original equipment manufacturer (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.
在Edit2框中写入A (ascII值是65);
BOOL CFloatDlg::PreTranslateMessage(MSG* pMsg)
{
CDLookView* pview=(CDLookView*)GetView(); if((pMsg->message==WM_KEYDOWN)&&(pMsg->wParam==VK_RETURN))
{
TCHAR szClass[10];
CWnd* pWndFocus=GetFocus(); //窗口获得焦点;是子窗口;有WantReturn属性;是Edit类
if((pWndFocus!=NULL)&&(IsChild(pWndFocus))||
(pWndFocus->GetStyle()&ES_WANTRETURN)&&
(GetClassName(pWndFocus->m_hWnd,szClass,10)&&
((lstrcmpi(szClass,_T("EDIT"))==0))))
{
pview->SendMessage(WM_COMMAND,ID_IMAGE_GO);
return TRUE;
}
return FALSE;
} return CDialogBar::PreTranslateMessage(pMsg);
}