LoadLibrary

LoadLibrary

　　LoadLibrary 　　VB/VC声明 　　Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long 　　说明 　　载入指定的动态链接库，并将它映射到当前进程使用的地址空间。一旦载入，即可访问库内保存的资源 　　返回值 　　Long，成功则返回库模块的句柄，零表示失败。会设置GetLastError 　　参数表 　　参数 类型及说明 　　lpLibFileName String，指定要载入的动态链接库的名称。采用与CreateProcess函数的lpCommandLine参数指定的同样的搜索顺序 　　注解 　　一旦不需要，用FreeLibrary函数释放DLL 　　VB6实例: 　　Create a new project and add this code to Form1 　　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 Form_Load() 　　On Error Resume Next 　　'KPD-Team 1999 　　'We're going to call an API-function, without declaring it! 　　Dim lb As Long, pa As Long 　　'map 'user32' into the address space of the calling process. 　　Lb = LoadLibrary("user32") 　　'retrieve the address of 'SetWindowTextA' 　　pa = GetProcAddress(lb, "SetWindowTextA") 　　'Call the SetWindowTextA-function 　　CallWindowProc pa, Me.hWnd, "Hello !", ByVal 0&, ByVal 0& 　　'unmap the library's address 　　FreeLibrary lb 　　End Sub