vb 获取窗口句柄并发信息

（本文中部分使用繁体字，如果在简体系统下请将第三部实例程序记事本标题换成相对应的简体名称）

第一部分：

常用的与窗体相关的API函数

Public Declare Function ShowWindow Lib"user32" (ByVal hwnd As Long,ByVal nCmdShow As Long) As Long （根据句柄控制某一窗体显示状态）

Public Declare Function EnableWindow Lib"user32" (ByVal hwnd As Long,ByVal fEnable As Long) As Long（使能窗口事件）

Public Declare Function FindWindow Lib"user32" Alias "FindWindowA" (ByVal lpClassName As String,ByVal lpWindowName As String) As Long（根据标题找主窗口句柄）

Public Declare Function EnumWindows Lib"user32" (ByVal lpEnumFunc As Long,ByVal lParam As Long) As Long（找到窗口组）

Public Declare Function FindWindowEx Lib"user32" Alias "FindWindowExA" (ByVal hWnd1 As Long,ByValhWnd2 As Long,ByVal lpsz1 As String,ByVal lpsz2 As String) As Long（找子窗口部件）

Public Declare Function GetParent Lib"user32" (ByVal hwnd As Long) As Long

Public Declare Function GetWindow Lib"user32" (ByVal hwnd As Long,ByVal wCmd As Long) As Long

Public Declare Function GetWindowText Lib"user32" Alias "GetWindowTextA" (ByVal hwnd As Long,ByVallpString As String,ByVal cch As Long) As Long（获取窗口标题）

Public Declare Function GetClassName Lib"user32" Alias "GetClassNameA" (ByVal hwnd As Long,ByVallpClassName As String,ByVal nMaxCount As Long) As Long（获取窗口类）

Public Declare Function SendMessage Lib"user32" Alias "SendMessageA" (ByVal hwnd As Long,ByValwMsg As Long,ByVal wParam As Long,lParam As Any) As Long（发送信息）

Private Declare Function PostMessage Lib"user32" Alias "PostMessageA" (ByVal hwnd As Long,ByVal lParam As Long) As Long（发送信息）

Public Declare Sub Sleep Lib "kernel32"(ByVal dwMilliseconds As Long) （延时用）

Public Declare Sub keybd_event Lib"user32" (ByVal bVk As Byte,ByVal bScan As Byte,ByVal dwFlags AsLong,ByVal dwExtraInfo As Long)（键盘事件）

第二部分

按键编码

Public Const VK_LBUTTON = &H1

Public Const VK_RBUTTON = &H2

Public Const VK_CANCEL = &H3

Public Const VK_MBUTTON = &H4

Public Const VK_BACK = &H8

Public Const VK_TAB = &H9

Public Const VK_CLEAR = &HC

Public Const VK_RETURN = &HD

Public Const VK_SHIFT = &H10

Public Const VK_CONTROL = &H11

Public Const VK_MENU = &H12

Public Const VK_PAUSE = &H13

Public Const VK_CAPITAL = &H14

Public Const VK_ESCAPE = &H1B

Public Const VK_SPACE = &H20

Public Const VK_PRIOR = &H21

Public Const VK_NEXT = &H22

Public Const VK_END = &H23

Public Const VK_HOME = &H24

Public Const VK_LEFT = &H25

Public Const VK_UP = &H26

Public Const VK_RIGHT = &H27

Public Const VK_DOWN = &H28

Public Const VK_Select = &H29

Public Const VK_PRINT = &H2A

Public Const VK_EXECUTE = &H2B

Public Const VK_SNAPSHOT = &H2C

Public Const VK_Insert = &H2D

Public Const VK_Delete = &H2E

Public Const VK_HELP = &H2F

Public Const VK_0 = &H30

Public Const VK_1 = &H31

Public Const VK_2 = &H32

Public Const VK_3 = &H33

Public Const VK_4 = &H34

Public Const VK_5 = &H35

Public Const VK_6 = &H36

Public Const VK_7 = &H37

Public Const VK_8 = &H38

Public Const VK_9 = &H39

Public Const VK_A = &H41

Public Const VK_B = &H42

Public Const VK_C = &H43

Public Const VK_D = &H44

Public Const VK_E = &H45

Public Const VK_F = &H46

Public Const VK_G = &H47

Public Const VK_H = &H48

Public Const VK_I = &H49

Public Const VK_J = &H4A

Public Const VK_K = &H4B

Public Const VK_L = &H4C

Public Const VK_M = &H4D

Public Const VK_N = &H4E

Public Const VK_O = &H4F

Public Const VK_P = &H50

Public Const VK_Q = &H51

Public Const VK_R = &H52

Public Const VK_S = &H53

Public Const VK_T = &H54

Public Const VK_U = &H55

Public Const VK_V = &H56

Public Const VK_W = &H57

Public Const VK_X = &H58

Public Const VK_Y = &H59

Public Const VK_Z = &H5A

Public Const VK_STARTKEY = &H5B

Public Const VK_CONTEXTKEY = &H5D

Public Const VK_NUMPAD0 = &H60

Public Const VK_NUMPAD1 = &H61

Public Const VK_NUMPAD2 = &H62

Public Const VK_NUMPAD3 = &H63

Public Const VK_NUMPAD4 = &H64

Public Const VK_NUMPAD5 = &H65

Public Const VK_NUMPAD6 = &H66

Public Const VK_NUMPAD7 = &H67

Public Const VK_NUMPAD8 = &H68

Public Const VK_NUMPAD9 = &H69

Public Const VK_MULTIPLY = &H6A

Public Const VK_ADD = &H6B

Public Const VK_SEPARATOR = &H6C

Public Const VK_SUBTRACT = &H6D

Public Const VK_DECIMAL = &H6E

Public Const VK_DIVIDE = &H6F

Public Const VK_F1 = &H70

Public Const VK_F2 = &H71

Public Const VK_F3 = &H72

Public Const VK_F4 = &H73

Public Const VK_F5 = &H74

Public Const VK_F6 = &H75

Public Const VK_F7 = &H76

Public Const VK_F8 = &H77

Public Const VK_F9 = &H78

Public Const VK_F10 = &H79

Public Const VK_F11 = &H7A

Public Const VK_F12 = &H7B

Public Const VK_F13 = &H7C

Public Const VK_F14 = &H7D

Public Const VK_F15 = &H7E

Public Const VK_F16 = &H7F

Public Const VK_F17 = &H80

Public Const VK_F18 = &H81

Public Const VK_F19 = &H82

Public Const VK_F20 = &H83

Public Const VK_F21 = &H84

Public Const VK_F22 = &H85

Public Const VK_F23 = &H86

Public Const VK_F24 = &H87

Public Const VK_NUMLOCK = &H90

Public Const VK_OEM_SCROLL = &H91

Public Const VK_OEM_1 = &HBA

Public Const VK_OEM_PLUS = &HBB

Public Const VK_OEM_COMMA = &HBC

Public Const VK_OEM_MINUS = &HBD

Public Const VK_OEM_PERIOD = &HBE

Public Const VK_OEM_2 = &HBF

Public Const VK_OEM_3 = &HC0

Public Const VK_OEM_4 = &HDB

Public Const VK_OEM_5 = &HDC

Public Const VK_OEM_6 = &HDD

Public Const VK_OEM_7 = &HDE

Public Const VK_OEM_8 = &HDF

Public Const VK_ICO_F17 = &HE0

Public Const VK_ICO_F18 = &HE1

Public Const VK_OEM102 = &HE2

Public Const VK_ICO_HELP = &HE3

Public Const VK_ICO_00 = &HE4

Public Const VK_ICO_CLEAR = &HE6

Public Const VK_OEM_RESET = &HE9

Public Const VK_OEM_JUMP = &HEA

Public Const VK_OEM_PA1 = &HEB

Public Const VK_OEM_PA2 = &HEC

Public Const VK_OEM_PA3 = &HED

Public Const VK_OEM_WSCTRL = &HEE

Public Const VK_OEM_CUSEL = &HEF

Public Const VK_OEM_ATTN = &HF0

Public Const VK_OEM_FINNISH = &HF1

Public Const VK_OEM_COPY = &HF2

Public Const VK_OEM_AUTO = &HF3

Public Const VK_OEM_ENLW = &HF4

Public Const VK_OEM_BACKTAB = &HF5

Public Const VK_ATTN = &HF6

Public Const VK_CRSEL = &HF7

Public Const VK_EXSEL = &HF8

Public Const VK_EREOF = &HF9

Public Const VK_PLAY = &HFA

Public Const VK_ZOOM = &HFB

Public Const VK_NONAME = &HFC

Public Const VK_PA1 = &HFD

Public Const VK_OEM_CLEAR = &HFE

第三部分：

实例打开记事本---并发送信息

（上面的声明放在一个模块中即可）

Option Explicit

Private StartTime As Long

Private Declare Function SendMessage& Lib"user32" Alias "SendMessageA" (ByVal hwnd As Long,lParam As Any)

Private Declare Function PostMessage Lib"user32" Alias "PostMessageA" (ByVal hwnd As Long,ByVal lParam As Long) As Long

Private Declare Function FindWindow Lib"user32" Alias "FindWindowA" (ByVal lpClassName As String,ByVal lpWindowName As String) As Long

Private Const WM_KEYDOWN = &H100

Private Const VK_F1 = &H70

Private Const WM_KEYUP = &H101

Public Sub Delay(mSec As Long)

DimTStart As Single

TStart =Timer

While(Timer - TStart) < (mSec / 1000)

DoEvents

Wend

End Sub

Private Sub Command1_Click()

DimReturnValue

ReturnValue = Shell("notepad.exe",vbNormalFocus) '打开记事本

AppActivate ReturnValue '激活窗口

Dim hwndAs Long

hwnd =FindWindow(vbNullString,"未命名-记事本")'窗口标题

SendKeys"= ",True

SendKeys"I am ok",True

SendKeys"{ENTER}",True

SendKeys "{TAB}",True

PostMessage hwnd,WM_KEYDOWN,VK_RETURN,0

Delay(1000)

PostMessage hwnd,WM_KEYUP,0

Delay(1000)

SendKeys "5",True

End Sub

Private Sub Command2_Click()

End

End Sub

第四部分

总结

获取句柄的方法

1主窗体（可参考上面的方法）

如果是多个窗体要查找某一个

'用 FindWindowEx 查找第一个，再用找到的窗口句柄作为参数再次调用 FindWindowEx，查找第二个，直到返回 0 为止
'得到句柄后，用 GetWindowText 得到标题，分析它提取出你需要的窗口
Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long,ByVal lpString As String,ByVal cch As Long) As Long
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long,ByVal hWnd2 As Long,ByVal lpsz2 As String) As Long
Private Sub Command1_Click()
Dim dl As Long,winHwnd As Long,nStr As String,nSize As Long

nSize = 128
Do
   winHwnd = FindWindowEx(0,winHwnd,vbNullString,vbNullString) '得到一个窗口句柄
   If winHwnd = 0 Then Exit Do
   nStr = String(nSize,vbNullChar)
   dl = GetWindowText(winHwnd,nStr,nSize)       '得到窗口标题
   nStr = Left(nStr,InStr(nStr,vbNullChar) - 1) '去掉后面的无用字符
   If LCase(Right(nStr,5)) = "1.exe" Then MsgBox winHwnd & vbCrLf & nStr '提取出符合条件的标题
Loop

2子窗体（部件），窗体组

`控件需要知道类名可以用spy++查看

privateSubCommand1_Click()
DimPhwndAsLong
DimChildHwndAsLong
Phwnd=FindWindow(vbNullString,"计算器")
IfPhwnd<>0Then
ChildHwnd=FindWindowEx(Phwnd,"Edit",vbNullString)
IfChildHwnd<>0Then
SendMessageChildHwnd,WM_SETTEXT,ByVal"我是计算器"
Else
MsgBox"找不到相关控件"
EndIf
Else
MsgBox"计算器程序没有运行"
EndIf
EndSub

发送信息的方法

1--------------

先获取窗口句柄（方法同上），然后用sendmessage发信息

Private Const WM_SETTEXT = &HC
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long,ByVal wMsg As Long,lParam As Any) As Long
Private Declare Function GetDlgItem Lib "user32" (ByVal hDlg As Long,ByVal nIDDlgItem As Long) As Long

Dim s As String
Dim FT_hWnd As Long
Dim ID_Control_hWnd As Long
s = "test" & vbCrLf & "找到你了"

 ID_Control_hWnd = GetDlgItem(你得到的句柄值,&HF)
SendMessage ID_Control_hWnd,ByVal s

2------------------------------

用 SendKeys 语句
AppActivate "接收键盘事件的窗口标题" ' 激活指定窗口
SendKeys "A",True '发送字符 A

' SendKeys "I am ok",True ' SendKeys "{ENTER}",True ' PostMessage hwnd,0 ' Delay (1000) ' PostMessage hwnd,0 ' Delay (1000)

vb 获取窗口句柄 并发信息

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