大佬教程收集整理的这篇文章主要介绍了windows – 在Visual Basic 6中访问动态加载的DLL(使用LoadLibrary)，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As Long) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Sub cmdTestLoadingDLL_Click()
Dim lb As Long,pa As Long
lb = LoadLibrary("D:\projects\other\VB_DLLs\TestDLL\TestDLL.dll")
MsgBox "Library address: " + lb
FreeLibrary lb
End Sub
我可以看到使用Process Explorer在显示消息框时将DLL加载到内存中,然后丢弃.但是,调用该方法自然是不够的 – 我需要访问动态加载的DLL中的方法.
我怎样才能做到这一点？我想在类mainClass中调用方法getVersion,它在TestDLL中,如下所示：
Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As Long) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Sub cmdTestLoadingDLL_Click()
Dim lb As Long,pa As Long
Dim versionString As String
lb = LoadLibrary("D:\projects\other\VB_DLLs\TestDLL\TestDLL.dll")
versionString = "- From DLL: " + mainClass.getVersion
MsgBox versionString
FreeLibrary lb
End Sub
但是,行
versionString = "- From DLL: " + mainClass.getVersion
抛出错误“需要对象”.
我会尝试以下方法：
Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As Long) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long,ByVal lpProcName As String) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long,ByVal hWnd As Long,ByVal Msg As Any,ByVal wParam As Any,ByVal lParam As Any) As Long
Private Sub Foo
On Error Resume Next
Dim lb As Long,pa As Long
Dim versionString As String
Dim retValue as Long
lb = LoadLibrary("D:\projects\other\VB_DLLs\TestDLL\TestDLL.dll")
'retrieve the address of getVersion'
pa = GetProcAddress(lb,"getVersion")
'Call the getVersion function'
retValue = CallWindowProc (pa,Me.hWnd,"I want my version",ByVal 0&,ByVal 0&)
'release the library'
FreeLibrary lb
End Sub
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