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用VB制作软键盘
青岛德固萨化学有限公司 杜运庆
看见微软智能拼音输入法的小键盘了吗？那东东可以在输入的时候用代替键盘。
当不希望操作员使用键盘的时候，那么你就要考虑为她或他提供软键盘了。下面我们就用VB来做这
个软键盘。
准备工作：
先画两个窗体Form1和Form2,Form2是作为接收按键测试用的，在上面放一个文本框Text1，把
Text1的MultiLine属性设为True,ScrollBars设为3-Both,然后写入如下代码：
Private Declare Function EnableWindow Lib "user32" (ByVal hwnd As Long, ByVal
fEnable As Long) As Long
Private Sub Form_Load()
调整大小
Me.Width = Screen.Width * 0.9
Me.Height = Screen.Height * 0.9
Form1.Show
禁止鼠标和键盘输入
EnableWindow Text1.hwnd, False
End Sub
Private Sub Form_Resize()
调整文本框大小
Text1. = 0
Text1.Left = 0
Text1.Width = Me.ScaleWidth
Text1.Height = Me.ScaleHeight
End Sub
Private Sub Form_Unload(Cancel As Integer)
End
End Sub
Form1作为小键盘用，把它的BorderStyle设为3-Fixed Dialog,把ControlBox属性设
为False，这样小键盘就没有标题栏了。Form1得跟微软智能拼音输入法的小键盘完全一样的大小
的窗体，经笔者的计算长×高是5310×2130。然后放上10个按扭，其中九个的Caption分别是
Tab、Caps、↑Shift、Ins、Del、(空格)、Esc、Enter和←(退格)。它们的位置和大小如下设
置：
Caption Left Height Width Name
↑Shift 1230 0 400 840 Command1
Caps 828 0 400 560 Command2
Tab 410 0 400 480 Command3
Ins 1640 0 400 570 Command4
Del 1640 870 400 550 Command5
(空格) 1640 1400 400 2565 Command6
Esc 1640 4670 400 550 Command7
Enter 820 4590 400 630 Command9
←(退格) 820 4590 400 630 Command10
接下来做一个Height为400、Width为360的按扭Command8,Caption为A a，由于按扭太小，系统会自动换行，看上去A在a的上面。复制该按扭，然
后在窗体上粘贴，程序会提示你是否产生控件数组，选择是，Command8变成了Command8(0),新产
生的按扭为Command8(1),一直粘贴，直到Command8(46)，修改它们的Caption使之与键盘上的其
它键一样。这里要注意几点：
1、按扭的字体为“小五”，有几个键显示的结果是纵向并排，可把字体设为“六号”，使之横向
并排，字体使用宋体，否则↑和←显示的不漂亮。
2、&符号要使用两个，即 && 7(&&与7之间只有一个空格)，确保每个按扭的Caption的长度为四
个字母。
3、把窗体的MousePointer设为15 - Size All，以便在运行的时候移动小键盘。
4、把所有按键的MousePointer都设为99 - Custom,而MouseIcon设为手形指针。
5、由于要指示Shift是否按下，Command1的Style属性设置为1-Graphical。
6、Form2的StartUpPosition属性设置为2-屏幕中心。
我们把Command8(x)的这些键暂时叫做“普通键”。由于前面已经定位了9个特殊键，所以可以通
过菜单栏的“格式”里面的“顶端对齐”、“相同水平间距”等选项很容易地把47个普通键放到与
键盘对应的位置上。另外，为了显示CAPS LOCK的状态，我们在窗体上加一个标签Label1，把它的
AutoSize属性设为True,Caption属性设为●，它的、Left、Height和With分别为1340、
4800、180和180。
接下来是写代码了，这里主要用了SendMessage发送消息的API函数，由于按扭CAPTION设置的巧
妙，所以47个普通键的代码就用的很少。所有代码如下：
API声明
Private Declare Function ReleaseCapture Lib "user32" () As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal
hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long
Private Declare Function SetWindowPos& Lib "user32" (ByVal hwnd As Long, ByVal
hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long,
ByVal cy As Long, ByVal wFlags As Long)
Private Declare Sub GetKeyboardStateByString Lib "user32"
Alias "GetKeyboardState" (ByVal pbKeyState As String)
Private Declare Sub SetKeyboardStateByString Lib "user32"
Alias "SetKeyboardState" (ByVal lppbKeyState As String)
常数
Const VK_CAPITAL = &H14
Const WM_CHAR = &H102
Const HTCAPTION = 2
Const WM_NCLBUTTONDOWN = &HA1
Const WM_KEYDOWN = &H100
Const VK_DELETE = &H2E
Const VK_INSERT = &H2D
定义变量
Dim rc as Long
Private Sub Command1_Click()
Shift键
If Command1.BackColor = &H8000000B Then
Command1.BackColor = &H80000005
Else
Command1.BackColor = &H8000000B
End If
End Sub
退格键
Private Sub Command10_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_CHAR, 8, 1)
End Sub
大小写转换键
Private Sub Command2_MouseDown(Button As Integer, Shift As Integer, X As
Single, Y As Single)
Dim CAPITALKey As String * 256
CAPITALKey = Space$(256)
GetKeyboardStateByString (CAPITALKey)
If Label1.ForeColor = vbBlack Then
Label1.ForeColor = vbGreen
Mid$(CAPITALKey, VK_CAPITAL + 1, 1) = Chr$(1)
Else
Label1.ForeColor = vbBlack
Mid$(CAPITALKey, VK_CAPITAL + 1, 1) = Chr$(0)
End If
Call SetKeyboardStateByString(CAPITALKey)
End Sub
TAB键
Private Sub Command3_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_CHAR, 9, 1)
End Sub
Ins键
Private Sub Command4_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_KEYDOWN, VK_INSERT, &H510001)
End Sub
Del键
Private Sub Command5_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_KEYDOWN, VK_DELETE, 1)
End Sub
空格键
Private Sub Command6_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_CHAR, 32, 1)
End Sub
Esc键
Private Sub Command7_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_CHAR, 27, 1)
End Sub
普通键
Private Sub Command8_Click(Index As Integer)
Dim keyx As Integer
If Command1.BackColor = &H80000005 Xor Label1.ForeColor = vbGreen Then
keyx = Asc(Mid(Command8(Index).Caption, 1, 1))
Else
keyx = Asc(Mid(Command8(Index).Caption, 4, 1))
End If
rc = SendMessage(Form2.Text1.hwnd, WM_CHAR, keyx, 1)
Command1.BackColor = &H8000000B
End Sub
回车键
Private Sub Command9_Click()
rc = SendMessage(Form2.Text1.hwnd, WM_CHAR, 13, 1)
End Sub
让小键盘在最前面
Private Sub Form_Load()
rtn = SetWindowPos(Me.hwnd, -1, 0, 0, 0, 0, 3)
End Sub
移动没有标题的小键盘
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y
As Single)
If Button = 1 Then
Dim ReturnVal As Long
X = ReleaseCapture()
ReturnVal = SendMessage(hwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0)
End If
End Sub
最后要提醒您的是：如果你要用于多个Text要做如下两步：
1、把FORM2中的EnableWindow Text1.hwnd, False去掉。
2、把软键盘代码中所有的Form2.Text1.Hwnd换成如下代码：Form2.ActiveControl.hwnd
瞧，超酷的小键盘就这样做成了！该程序在VB6+WIN98下运行通过，如果你需要本事例的源代码，
请在本文见报后到第一VB论坛的首页下载吧！网址是http://www.vbgood.com
