再谈vc发送键盘、组合键消息

朴灿烈づ我的快乐病毒、 2021-11-23 18:16 446阅读 0赞

关于向Windows窗口发送Alt组合键的问题,这个真是经典问题啊,在网上找了一下,问的人N多,方法差不多,

但就是没有很好解决问题。  
  
之前找到一个能正确发送的code:(Alt+A)  
  
PostMessage(hWnd,WM\_SYSKEYDOWN,VK\_MENU,0);  
  
PostMessage(hWnd,WM\_SYSKEYDOWN,0x41,0);  
  
Sleep(50);  
  
PostMessage(hWnd,WM\_SYSKEYUP,0x41,0);  
  
PostMessage(hWnd,WM\_SYSKEYUP,VK\_MENU,0);  
  
有人解释说，按下组合键的时候系统是发两条消息的  
  
但是看到Win32 SDK,感觉上就发一次就可以了……  
  
偶然间又看到最后一个参数的说明，有所发现！先看WM\_SYSKEYDOWN的help  
  
The WM\_SYSKEYDOWN message is posted to the window with the keyboard focus when the user holds down the ALT key and then presses another key. It also occurs when no window currently has the keyboard focus; in this case, the WM\_SYSKEYDOWN message is sent to the active window. The window that receives the message can distinguish between these two contexts by checking the context code in the lKeyData parameter.   
  
WM\_SYSKEYDOWN    
nVirtKey = (int) wParam; // virtual-key code   
lKeyData = lParam;       // key data   
  
  
Parameters  
  
nVirtKey  
  
Value of wParam. Specifies the virtual-key code of the key being pressed.   
  
lKeyData  
  
Value of 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. The value is the number of times the keystroke is repeated as a result of the user holding down the key.  
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 1 if the ALT key is down while the key is pressed; it is 0 if the WM\_SYSKEYDOWN message is posted to the active window because no window has the keyboard focus.  
30 Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is 0 if the key is up.  
31 Specifies the transition state. The value is always 0 for a WM\_SYSKEYDOWN message.  
  
  
之前曾经修改过keyData的16－23位为VK\_MENU，第30位参数为1,但没效果  
  
请看位29的说明！！  
  
The value is 1 if the ALT key is down while the key is pressed;   
  
当值为1时表示ALT键被按下！这不正是我需要的吗？于是把29位设置为1,函数调用变成  
  
PostMessage(hWnd,WM\_SYSKEYDOWN,0x41,1<<29);  
  
经过测试，发现这个就是Alt+A的效果！！原来这么简单，但为什么很多人弄得那么复杂，我当时查找的时候也是迷惘啊，浪费了N多小时。  
  
类似有个WM\_SYSKEYUP,WM\_SYSCHAR(这个不知道干什么用)

记录一下免得 又便成了 找不到资料的傻子了

postmessage(edit1.handle,wm\_keydown,vk\_down,$20000000）

Ctrl ： $10000000;     
Shift： $08000000;     
Alt:20000000

Delphi键盘按键伪码

if key = chr(VK\_RETURN) then...

常数名称 十六进制值 十进制值 对应按键  
VK\_LBUTTON 01 1 鼠标的左键  
VK\_RBUTTON 02 2 鼠标的右键  
VK-CANCEL 03 3 Contol-break 执行  
VK\_MBUTTON 04 4 鼠标的中键（三按键鼠标)  
VK\_BACK 08 8 Backspace键  
VK\_TAB 09 9 Tab键  
VK\_CLEAR 0C 12 Clear键  
VK\_RETURN 0D 13 Enter键  
VK\_SHIFT 10 16 Shift键  
VK\_CONTROL 11 17 Ctrl键  
VK\_MENU 12 18 Alt键  
VK\_PAUSE 13 19 Pause键  
VK\_CAPITAL 14 20 Caps Lock键  
VK\_ESCAPE 1B 27 Ese键  
VK\_SPACE 20 32 Spacebar键  
VK\_PRIOR 21 33 Page Up键  
VK\_NEXT 22 34 Page Domw键  
VK\_END 23 35 End键  
VK\_HOME 24 36 Home键  
VK\_LEFT 25 37 LEFT ARROW 键(←)  
VK\_UP 26 38 UP ARROW键(↑)  
VK\_RIGHT 27 39 RIGHT ARROW键(→)  
VK\_DOWN 28 40 DOWN ARROW键(↓)  
VK\_SELECT 29 41 SELECT键  
VK\_EXECUTE 2B 43 EXECUTE键  
VK\_SNAPSHOT 2C 44 Print Screen键   
VK\_INSERT 2D 45 Ins键  
VK\_DELETE 2E 46 Del键  
VK\_HELP 2F 47 Help键  
VK\_0 30 48 0键  
VK\_1 31 49 1键  
VK\_2 32 50 2键  
VK\_3 33 51 3键  
VK\_4 34 52 4键  
VK\_5 35 53 5键  
VK\_6 36 54 6键  
VK\_7 37 55 7键  
VK\_8 38 56 8键  
VK\_9 39 57 9键  
VK\_A 41 65 A键  
VK\_B 42 66 B键  
VK\_C 43 67 C键  
VK\_D 44 68 D键  
VK\_E 45 69 E键  
VK\_F 46 70 F键  
VK\_G 47 71 G键  
VK\_H 48 72 H键  
VK\_I 49 73 I键  
VK\_J 4A 74 J键  
VK\_K 4B 75 K键  
VK\_L 4C 76 L键  
VK\_M 4D 77 M键  
VK\_N 4E 78 N键  
VK\_O 4F 79 O键  
VK\_P 50 80 P键  
VK\_Q 51 81 Q键  
VK\_R 52 82 R键  
VK\_S 53 83 S键  
VK\_T 54 84 T键  
VK\_U 55 85 U键  
VK\_V 56 86 V键  
VK\_W 57 87 W键  
VK\_X 58 88 X键  
VK\_Y 59 89 Y键  
VK\_BZ 5A 90 Z键  
VK\_NUMPAD0 60 96 数字键0键  
VK\_NUMPAD1 61 97 数字键1键  
VK\_NUMPAD2 62 98 数字键2键  
VK\_NUMPAD3 63 99 数字键3键  
VK\_NUMPAD4 64 100 数字键4键  
VK\_NUMPAD5 65 101 数字键5键  
VK\_NUMPAD6 66 102 数字键6键  
VK\_NUMPAD7 67 103 数字键7键  
VK\_NUMPAD8 68 104 数字键8键  
VK\_NUMPAD9 69 105 数字键9键  
VK\_MULTIPLY 6A 106 \*键  
VK\_ADD 6B 107 +键  
VK\_SEPARATOR 6C 108 Separator键  
VK\_SUBTRACT 6D 109 -键  
VK\_DECIMAL 6E 110 .键  
VK\_DIVIDE 6F 111 键  
VK\_F1 70 112 F1键  
VK\_F2 71 113 F2键  
VK\_F3 72 114 F3键  
VK\_F4 73 115 F4键  
VK\_F5 74 116 F5键  
VK\_F6 75 117 F6键  
VK\_F7 76 118 F7键  
VK\_F8 77 119 F8键  
VK\_F9 78 120 F9键  
VK\_F10 79 121 F10键  
VK\_F11 7A 122 F11键  
VK\_F12 7B 123 F12键  
VK\_NUMLOCK 90 144 Num Lock 键  
VK\_SCROLL 91 145 Scroll Lock键

转载于:https://www.cnblogs.com/MaxWoods/p/3296907.html