請問如何從VB.net 利用 Windows Message 傳送字串到 VB6
上網找了資料都是VB.net<=>VB.net或VB6<=>VB6，但是我需要從VB.net傳字串到VB6，下面貼的code可以VB.net<=>VB.net和VB6<=>VB6，但無法從VB.net傳字串到VB6，
幾天試下來都沒什麼頭緒，麻煩各位前輩們指導，非常感謝!!!
VB.net:(發送端)
Public Structure CopyDataStruct
Public dwData As Integer '附加參數
Public cdData As Integer '數據大小
Public lpData As Integer '數據內容
End Structure
Private WN As IntPtr
Private Const WM_COPYDATA As Integer = &H4A
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Integer, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
WN = FindWindow(vbNullString, TextBox1.Text)
If WN.Equals(IntPtr.Zero) Then
Label1.Text = "找不到" & TextBox1.Text
Else
Label1.Text = "找到" & TextBox1.Text
End If
Label2.Text = WN.ToString
Dim cdsMessage As New CopyDataStruct
' Get an IntPtr which contains the message
Dim strMessage As String = TextBox7.Text
Dim ptrMessage As IntPtr = Runtime.InteropServices.Marshal.StringToHGlobalUni(strMessage)
Dim rtn As Integer
' Populate the message into the COPYDATASTRUCT
cdsMessage.dwData = 3
cdsMessage.lpData = ptrMessage
cdsMessage.cdData = System.Text.Encoding.Unicode.GetByteCount(strMessage)
' Allocate memory for it and copy the COPYDATASTRUCT into an IntPtr
Dim ptrStruct As IntPtr = Runtime.InteropServices.Marshal.AllocHGlobal(Runtime.InteropServices.Marshal.SizeOf(cdsMessage))
Marshal.StructureToPtr(cdsMessage, ptrStruct, True)
' Send the windows message to the receiver
rtn = SendMessage(WN, WM_COPYDATA, Convert.ToInt32(TextBox9.Text), ptrStruct)
' Free the memory
Marshal.FreeHGlobal(ptrStruct)
TextBox6.Text = rtn
End Sub
VB6:(接收字串)參考網站:http://support.microsoft.com/kb/176058/en-us
Form1
Private Sub Form_Load()
gHW = Me.hwnd
Hook
Me.Caption = "Target"
Me.Show
Label1.Caption = Hex$(gHW)
End Sub
Private Sub Form_Unload(Cancel As Integer)
Unhook
End Sub
Moudule
Visual Basic 6.0 windows message VB.NET windows message --------------------编程问答-------------------- 找到問題了，VB.net程式修改如以下:
Type COPYDATASTRUCT
dwData As Long
cbData As Long
lpData As Long
End Type
Public Const GWL_WNDPROC = (-4)
Public Const WM_COPYDATA = &H4A
Global lpPrevWndProc As Long
Global gHW As Long
'Copies a block of memory from one location to another.
Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
(hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Declare Function CallWindowProc Lib "user32" Alias _
"CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As _
Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As _
Long) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As _
Long) As Long
Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Public Sub Hook()
lpPrevWndProc = SetWindowLong(gHW, GWL_WNDPROC, _
AddressOf WindowProc)
Debug.Print lpPrevWndProc
End Sub
Public Sub Unhook()
Dim temp As Long
temp = SetWindowLong(gHW, GWL_WNDPROC, lpPrevWndProc)
End Sub
Function WindowProc(ByVal hw As Long, ByVal uMsg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
If uMsg = WM_COPYDATA Then
Call mySub(lParam, wParam)
'Sleep (3000)
WindowProc = CInt(Form1.Text1.Text)
Else
WindowProc = CallWindowProc(lpPrevWndProc, hw, uMsg, wParam, _
lParam)
End If
End Function
Sub mySub(lParam As Long, wParam As Long)
Dim cds As COPYDATASTRUCT
Dim buf(1 To 255) As Byte
Call CopyMemory(cds, ByVal lParam, Len(cds))
Select Case cds.dwData
Case 1
Debug.Print "got a 1"
Case 2
Debug.Print "got a 2"
Case 3
Call CopyMemory(buf(1), ByVal cds.lpData, cds.cbData)
a$ = StrConv(buf, vbUnicode)
a$ = Left$(a$, InStr(1, a$, Chr$(0)) - 1)
Form1.Print a$
Form1.Print wParam
End Select
End Sub
要變成 byte array
--------------------编程问答-------------------- Thanx Very nice
Public Structure CopyDataStructtest
Public dwData As Integer '附加參數
Public cbData As Integer '數據大小
Public lpData As IntPtr '數據內容
End Structure
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
Dim bytes() As Byte
Dim encoding As New System.Text.ASCIIEncoding()
bytes = encoding.GetBytes(TextBox7.Text)
Dim vCopyDataStruct As New CopyDataStructtest
vCopyDataStruct.dwData = 3
vCopyDataStruct.cbData = bytes.Length + 1
vCopyDataStruct.lpData = Marshal.UnsafeAddrOfPinnedArrayElement(bytes, 0)
Dim vAddress = Marshal.AllocCoTaskMem(Marshal.SizeOf(vCopyDataStruct))
Marshal.StructureToPtr(vCopyDataStruct, vAddress, True)
SendMessage(WN, WM_COPYDATA, Convert.ToInt32(TextBox9.Text), CInt(vAddress))
Marshal.FreeBSTR(vCopyDataStruct.lpData)
Marshal.FreeCoTaskMem(vAddress)
End Sub
--------------------编程问答-------------------- 厉害啊,为什么两个都有源代码的程序偏偏要用Windows Message来通信呢?
补充：.NET技术 , VB.NET
