键盘快捷键的下拉菜单有时不会出现 [英] Dropdown menu from keyboard shortcut sometimes not appearing

问题描述

这是一个非常奇怪的问题。我有一个嵌入式WebBrowser控件，有时，根据我以前的操作，所选菜单项的键盘快捷键（如Alt-F下拉文件菜单）不起作用。其他时候，他们这样做。



当我运行Spy ++时，我可以看到接收按键的窗口在它工作时和它没有的时候是不同的工作，导致一组完全不同的行为（如果它确实有效，会出现各种快乐的WM_PAINT消息并显示菜单。）



两个窗口都属于Windows资源管理器服务器，唯一的区别是当快捷键不起作用时，窗口左上角的位置是负的。



问题是，如何让键盘快捷键始终如一？以前有人经历过吗？我想我可以尝试将焦点设置到真正的Windows资源管理器服务器窗口，但我还没有尝试过。



这里有一个跟踪失败：

This is a very strange problem. I have an embedded WebBrowser control, and sometimes, depending on my previous action, the keyboard shortcuts for selected menu items (like "Alt-F" to pull down the File menu) do not work. Other times, they do.

When I run Spy++, I can see that the window that is receiving the keypress is different when it does work and when it doesn''t work, resulting in a completely different set of behavior (if it does work, all sorts of happy WM_PAINT messages appear and the menu appears.)

Both windows belong to "Windows Explorer Server", the only difference is that when the shortcut keys don''t work, the location of the window''s top-left corner is negative.

The questions are, how do I get keyboard shortcuts to consistently work? Anyone experience this before? I suppose I could try setting the focus to the "real" Windows Explorer Server window, but I haven''t tried that yet.

Here''s a trace for a failure:

<008166> 000D04AA P WM_SYSKEYDOWN nVirtKey:''F'' cRepeat:1 ScanCode:21 fExtended:0 fAltDown:1 fRepeat:0 fUp:0
<008167> 000808B8 P message:0x8002 [User-defined:WM_APP+2] wParam:00000000 lParam:00000000
<008168> 000D04AA P WM_SYSCHAR chCharCode:''102'' (102) cRepeat:1 ScanCode:21 fExtended:0 fAltDown:1 fRepeat:0 fUp:0
<008169> 00380370 S WM_GETTEXTLENGTH
<008170> 00380370 R WM_GETTEXTLENGTH cch:4
<008171> 00380370 S WM_GETTEXT cchTextMax:10 lpszText:0046DB0C
<008172> 00380370 R WM_GETTEXT cchCopied:4 lpszText:0046C8F8 ("Ýc²V")
<008173> 001507A4 S WM_GETTEXTLENGTH
<008174> 001507A4 R WM_GETTEXTLENGTH cch:6
<008175> 001507A4 S WM_GETTEXT cchTextMax:14 lpszText:0046DB08
<008176> 001507A4 R WM_GETTEXT cchCopied:6 lpszText:0046C8F4 ("")
<008177> 000908A0 S WM_GETTEXTLENGTH
<008178> 000908A0 R WM_GETTEXTLENGTH cch:4
<008179> 000908A0 S WM_GETTEXT cchTextMax:10 lpszText:0046DB0C
<008180> 000908A0 R WM_GETTEXT cchCopied:4 lpszText:0046C8F8 ("Ýc²V")
<008181> 0019078C S WM_GETTEXTLENGTH
<008182> 0019078C R WM_GETTEXTLENGTH cch:5
<008183> 0019078C S WM_GETTEXT cchTextMax:12 lpszText:0046DB0C
<008184> 0019078C R WM_GETTEXT cchCopied:5 lpszText:0046C8F8 ("Ýc²V")
<008185> 000D04AA S WM_SYSCOMMAND uCmdType:SC_KEYMENU xPos:102 yPos:0 (used mnemonic)
<008186> 00120924 S WM_ENTERMENULOOP fIsTrackPopupMenu:False
<008187> 00120924 R WM_ENTERMENULOOP
<008188> 00120924 S WM_SETCURSOR hwnd:00120924 nHittest:HTCAPTION wMouseMsg:0000
<008189> 00120924 R WM_SETCURSOR fHaltProcessing:False
<008190> 00120924 S WM_INITMENU hmenuInit:118E0043
<008191> 00120924 R WM_INITMENU
<008192> 00120924 S WM_MENUCHAR chUser:''f'' (102) fuFlag:MF_SYSMENU hmenu:118E0043
<008193> 00120924 R WM_MENUCHAR fAction:0 (discard character and beep)
<008194> 00120924 S WM_CAPTURECHANGED hwndNewCapture:00000000
<008195> 00120924 R WM_CAPTURECHANGED
<008196> 00120924 S WM_MENUSELECT uItem:0 fuFlags:FFFF (menu was closed) hmenu:00000000
<008197> 00120924 R WM_MENUSELECT
<008198> 00120924 S WM_EXITMENULOOP fIsTrackPopupMenu:False
<008199> 00120924 R WM_EXITMENULOOP

这里有成功的痕迹：

and here''s a trace for success:

<016831> 001507F8 P WM_SYSKEYDOWN nVirtKey:''F'' cRepeat:1 ScanCode:21 fExtended:0 fAltDown:1 fRepeat:0 fUp:0
<016832> 000808B8 P message:0x8002 [User-defined:WM_APP+2] wParam:00000000 lParam:00000000
<016833> 001507F8 P WM_SYSCHAR chCharCode:''102'' (102) cRepeat:1 ScanCode:21 fExtended:0 fAltDown:1 fRepeat:0 fUp:0
<016834> 00380370 S WM_GETTEXTLENGTH
<016835> 00380370 R WM_GETTEXTLENGTH cch:4
<016836> 00380370 S WM_GETTEXT cchTextMax:10 lpszText:0046DB0C
<016837> 00380370 R WM_GETTEXT cchCopied:4 lpszText:0046C8F8 pstr:0145DD80
<016838> 001507A4 S WM_GETTEXTLENGTH
<016839> 001507A4 R WM_GETTEXTLENGTH cch:6
<016840> 001507A4 S WM_GETTEXT cchTextMax:14 lpszText:0046DB08
<016841> 001507A4 R WM_GETTEXT cchCopied:6 lpszText:0046C8F4 ("")
<016842> 000908A0 S WM_GETTEXTLENGTH
<016843> 000908A0 R WM_GETTEXTLENGTH cch:4
<016844> 000908A0 S WM_GETTEXT cchTextMax:10 lpszText:0046DB0C
<016845> 000908A0 R WM_GETTEXT cchCopied:4 lpszText:0046C8F8 pstr:0145DD80
<016846> 0019078C S WM_GETTEXTLENGTH
<016847> 0019078C R WM_GETTEXTLENGTH cch:5
<016848> 0019078C S WM_GETTEXT cchTextMax:12 lpszText:0046DB0C
<016849> 0019078C R WM_GETTEXT cchCopied:5 lpszText:0046C8F8 ("@")
<016850> 002F01EC S WM_PAINT hdc:00000000
<016851> 002F01EC S WM_ERASEBKGND hdc:F7010D72
<016852> 002F01EC R WM_ERASEBKGND fErased:True
<016853> 002F01EC S WM_GETTEXTLENGTH
<016854> 002F01EC R WM_GETTEXTLENGTH cch:0
<016855> 002F01EC S WM_GETTEXT cchTextMax:2 lpszText:0046D6E4
<016856> 002F01EC R WM_GETTEXT cchCopied:0 lpszText:0046C4D0 ("")
<016857> 002F01EC S WM_GETTEXTLENGTH
<016858> 002F01EC R WM_GETTEXTLENGTH cch:0
<016859> 002F01EC S WM_GETTEXT cchTextMax:2 lpszText:0046D6E4
<016860> 002F01EC R WM_GETTEXT cchCopied:0 lpszText:0046C4D0 ("")
<016861> 002F01EC R WM_PAINT
<016862> 001307C6 S WM_GETTEXTLENGTH
<016863> 001307C6 R WM_GETTEXTLENGTH cch:0
<016864> 001307C6 S WM_GETTEXT cchTextMax:2 lpszText:0046DA9C
<016865> 001307C6 R WM_GETTEXT cchCopied:0 lpszText:0046C888 ("")
<016866> 001D04DE S WM_GETMINMAXINFO lpmmi:0046E660
<016867> 001D04DE R WM_GETMINMAXINFO lpmmi:0046E450
<016868> 001D04DE S WM_NCCREATE lpcs:0046E654
<016869> 001D04DE R WM_NCCREATE fContinue:True
<016870> 001D04DE S WM_NCCALCSIZE fCalcValidRects:False lpncsp:0046E640
<016871> 001D04DE R WM_NCCALCSIZE fuValidRect:0000 lpncsp:0046E408
<016872> 001D04DE S WM_CREATE lpcs:0046E654
<016873> 001D04DE R WM_CREATE fContinue:0 (continue creation)
<016874> 001307C6 S WM_SHOWWINDOW fShow:True fuStatus:0 (ShowWindow was called)
<016875> 001307C6 R WM_SHOWWINDOW
<016876> 001307C6 S WM_WINDOWPOSCHANGING lpwp:0046EBA0
<016877> 001307C6 R WM_WINDOWPOSCHANGING
<016878> 001307C6 S WM_NCPAINT hrgn:00000001
<016879> 001307C6 R WM_NCPAINT
<016880> 001307C6 S WM_ERASEBKGND hdc:47010F2A
<016881> 001307C6 R WM_ERASEBKGND fErased:True
<016882> 002D0826 S WM_NCCREATE lpcs:0046EB8C
<016883> 002D0826 S WM_NCCALCSIZE fCalcValidRects:False lpncsp:0046EB78
<016884> 002D0826 S WM_CREATE lpcs:0046EB8C
<016885> 002D0826 S WM_SIZE fwSizeType:SIZE_RESTORED nWidth:0 nHeight:0
<016886> 002D0826 S WM_MOVE xPos:0 yPos:0
<016887> 002D0826 S WM_WINDOWPOSCHANGING lpwp:0046EBA0
<016888> 002D0826 S WM_WINDOWPOSCHANGED lpwp:0046EBA0
<016889> 001307C6 S WM_WINDOWPOSCHANGED lpwp:0046EBA0
<016890> 001307C6 R WM_WINDOWPOSCHANGED
<016891> 001307C6 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016892> 001307C6 R WM_WINDOWPOSCHANGING
<016893> 000D08F0 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016894> 000D08F0 R WM_WINDOWPOSCHANGING
<016895> 002C0800 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016896> 002C0800 R WM_WINDOWPOSCHANGING
<016897> 00070578 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016898> 00070578 S message:0x043B [User-defined:WM_USER+59] wParam:00000000 lParam:02BB57C4
<016899> 00070578 R message:0x043B [User-defined:WM_USER+59] lResult:00000000
<016900> 00070578 R WM_WINDOWPOSCHANGING
<016901> 0013026E S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016902> 0013026E S message:0x043B [User-defined:WM_USER+59] wParam:00000000 lParam:02BB58CC
<016903> 0013026E R message:0x043B [User-defined:WM_USER+59] lResult:00000000
<016904> 0013026E R WM_WINDOWPOSCHANGING
<016905> 000D07E6 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016906> 000D07E6 S message:0x043B [User-defined:WM_USER+59] wParam:00000000 lParam:02BB59D4
<016907> 000D07E6 R message:0x043B [User-defined:WM_USER+59] lResult:00000000
<016908> 000D07E6 R WM_WINDOWPOSCHANGING
<016909> 000B0832 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016910> 000B0832 S message:0x043B [User-defined:WM_USER+59] wParam:00000000 lParam:02BB5ADC
<016911> 000B0832 R message:0x043B [User-defined:WM_USER+59] lResult:00000000
<016912> 000B0832 R WM_WINDOWPOSCHANGING
<016913> 004F034E S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016914> 004F034E S message:0x043B [User-defined:WM_USER+59] wParam:00000000 lParam:02BB5BE4
<016915> 004F034E R message:0x043B [User-defined:WM_USER+59] lResult:00000000
<016916> 004F034E R WM_WINDOWPOSCHANGING
<016917> 00120924 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016918> 00120924 R WM_WINDOWPOSCHANGING
<016919> 001307C6 S WM_NCPAINT hrgn:00000001
<016920> 001307C6 R WM_NCPAINT
<016921> 001307C6 S WM_ERASEBKGND hdc:F7010D72
<016922> 001307C6 R WM_ERASEBKGND fErased:True
<016923> 002D0826 S WM_WINDOWPOSCHANGING lpwp:0046EC14
<016924> 002D0826 S WM_WINDOWPOSCHANGED lpwp:0046EC14
<016925> 001307C6 S WM_WINDOWPOSCHANGED lpwp:0046EC14
<016926> 001307C6 R WM_WINDOWPOSCHANGED
<016927> 001307C6 S WM_PAINT hdc:00000000
<016928> 001307C6 S WM_ERASEBKGND hdc:47010F2A
<016929> 001307C6 R WM_ERASEBKGND fErased:True
<016930> 001307C6 S WM_GETTEXTLENGTH
<016931> 001307C6 R WM_GETTEXTLENGTH cch:0
<016932> 001307C6 S WM_GETTEXT cchTextMax:2 lpszText:0046D5F8
<016933> 001307C6 R WM_GETTEXT cchCopied:0 lpszText:0046C3E4 ("ì
/")
<016934> 001307C6 S WM_GETTEXTLENGTH
<016935> 001307C6 R WM_GETTEXTLENGTH cch:0
<016936> 001307C6 S WM_GETTEXT cchTextMax:2 lpszText:0046D5F8
<016937> 001307C6 R WM_GETTEXT cchCopied:0 lpszText:0046C3E4 ("ì
/")
<016938> 001307C6 R WM_PAINT
<016939> 001507F8 S WM_NCHITTEST xPos:583 yPos:422
<016940> 001507F8 R WM_NCHITTEST nHittest:HTCLIENT
<016941> 001507F8 S WM_NCHITTEST xPos:583 yPos:422
<016942> 001507F8 R WM_NCHITTEST nHittest:HTCLIENT
<016943> 001507F8 S WM_SETCURSOR hwnd:001507F8 nHittest:HTCLIENT wMouseMsg:WM_MOUSEMOVE
<016944> 001507F8 R WM_SETCURSOR fHaltProcessing:False
<016945> 001507F8 P WM_MOUSEMOVE fwKeys:0000 xPos:240 yPos:200
<016946> 001507F8 P WM_SYSKEYUP nVirtKey:''F'' cRepeat:1 ScanCode:21 fExtended:0 fAltDown:1 fRepeat:1 fUp:1

Marc

Marc

推荐答案

//if your control not focused
if (!controlInstance.Focused)
{
    //make it focused
    controlInstance.Focus();
    //menu code here
    //{code}
}

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