Question

这个VB6代码的目的是返回WinAmp的当前播放文件名（不是标题）。

这是我需要转换为VBNET的行：

Temp = StrConv(Buffer, vbUnicode)
strFileName = Left$(Temp, InStr(Temp, Chr$(0)) - 1)

Buffer是字节类型，temp和strFileName是字符串类型。

同样在这里：

Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Long, ByRef lpBuffer As Byte, ByVal nSize As Long, ByRef lpNumberOfBytesRead As Long) As Long

...我已将“ByRef lpBuffer As Any”更改为“ByRef lpBuffer As Byte”（我想我在那里做了正确的更改）

这是完整的代码：

Public Class Form1

    Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpszClassName As String, ByVal lpszWindowName As String) As Long
    Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hWnd As Long, ByRef lpdwProcessId As Long) As Long
    Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
    Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Long, ByRef lpBuffer As Byte, ByVal nSize As Long, ByRef lpNumberOfBytesRead As Long) As Long
    Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

    Private Const PROCESS_VM_READ As Long = &H10
    Private Const WM_USER As Long = &H400
    Private Const IPC_GETPLAYLISTFILE As Long = 211
    Private Const IPC_GETLISTPOS As Long = 125
    Private Const MAX_PATH As Long = 260
    Private hWndWinamp As Long

    Private Function GetWinampWindow() As Long
        GetWinampWindow = FindWindow("Winamp v1.x", vbNullString)
    End Function

    Public Function GetPlayingFileName() As String
        Dim strFileName As String
        Dim lp As Long, lpWinamp As Long
        Dim iIndex As Long
        Dim PID As Long
        Dim bRet As Long
        Dim dwRead As Long
        Dim Buffer(MAX_PATH) As Byte
        Dim Temp As String

        hWndWinamp = GetWinampWindow

        If hWndWinamp = 0 Then
            GetPlayingFileName = ""
            Exit Function
        End If

        iIndex = SendMessage(hWndWinamp, WM_USER, 0, IPC_GETLISTPOS)

        lp = SendMessage(hWndWinamp, WM_USER, iIndex, IPC_GETPLAYLISTFILE)

        If lp = 0 Then
            GetPlayingFileName = ""
            Exit Function
        End If

        Call GetWindowThreadProcessId(hWndWinamp, PID)

        lpWinamp = OpenProcess(PROCESS_VM_READ, 0, PID)

        If lpWinamp = 0 Then
            GetPlayingFileName = ""
            Exit Function
        End If

        bRet = ReadProcessMemory(lpWinamp, lp, Buffer(0), MAX_PATH, dwRead)

        Call CloseHandle(lpWinamp)

        Temp = StrConv(Buffer, vbUnicode)

        strFileName = Left$(Temp, InStr(Temp, Chr$(0)) - 1)

        GetPlayingFileName = strFileName

    End Function

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        MsgBox(GetPlayingFileName())
    End Sub

End Class

更新

这是建议后面的更新代码，但是在try / catch行中出现了错误： STARTINDEX不能低于零

Public Class Form1

    Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpszClassName As String, ByVal lpszWindowName As String) As Long
    Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hWnd As Long, ByRef lpdwProcessId As Long) As Long
    Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
    Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Long, ByRef lpBuffer As Byte, ByVal nSize As Long, ByRef lpNumberOfBytesRead As Long) As Long
    Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

    Private Const PROCESS_VM_READ As Long = &H10
    Private Const WM_USER As Long = &H400
    Private Const IPC_GETPLAYLISTFILE As Long = 211
    Private Const IPC_GETLISTPOS As Long = 125
    Private Const MAX_PATH As Long = 260
    Private hWndWinamp As Long

    Private Function GetWinampWindow() As Long
        GetWinampWindow = FindWindow("Winamp v1.x", vbNullString)
    End Function

    Public Function GetPlayingFileName() As String
        Dim strFileName As String
        Dim lp As Long, lpWinamp As Long
        Dim iIndex As Long
        Dim PID As Long
        Dim bRet As Long
        Dim dwRead As Long
        Dim Buffer(MAX_PATH) As Byte
        Dim Temp As String

        hWndWinamp = GetWinampWindow()

        If hWndWinamp = 0 Then
            GetPlayingFileName = ""
            Exit Function
        End If

        iIndex = SendMessage(hWndWinamp, WM_USER, 0, IPC_GETLISTPOS)

        lp = SendMessage(hWndWinamp, WM_USER, iIndex, IPC_GETPLAYLISTFILE)

        If lp = 0 Then
            GetPlayingFileName = ""
            Exit Function
        End If

        Call GetWindowThreadProcessId(hWndWinamp, PID)

        lpWinamp = OpenProcess(PROCESS_VM_READ, 0, PID)

        If lpWinamp = 0 Then
            GetPlayingFileName = ""
            Exit Function
        End If

        bRet = ReadProcessMemory(lpWinamp, lp, Buffer(0), MAX_PATH, dwRead)

        Call CloseHandle(lpWinamp)

        ' Original VB6 code
        'Temp = StrConv(Buffer, vbUnicode)
        'strFileName = Left$(Temp, InStr(Temp, Chr$(0)) - 1)

        Temp = System.Text.UnicodeEncoding.Unicode.GetString(Buffer)

        Try
            strFileName = Temp.Substring(Temp.IndexOf(CChar("0")) - 1)
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try

        GetPlayingFileName = strFileName

    End Function

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        MsgBox(GetPlayingFileName())
    End Sub

End Class

Answer 1

VB.NET中使用StrConv()转换为unicode的等价物是Encoding.Convert。

相当于Left()为String.Substring，Instr()为String.IndexOf。

已添加为了回答错误消息，InStr（）索引从1开始，而不是0（VB.NET）。您需要对这些值进行调整。

Answer 2

记得导入system.text

dim aux as UnicodeEncoding = new UnicodeEncoding
temp = aux.GetString(buffer)
strfilename = temp.substring(temp.indexof(cchar("0"))-1)

哪个VB6代码相当于VBNET？

2 个答案: