LoadLibrary是计算机语法
基本介绍
- 外文名LoadLibrary
- 备注计算机语法
- 返回值注解不需要，用FreeLibrary函式释放
- VB6实例'KPD-Team 1999
语法
Syntax（C++）
HMODULE WINAPI LoadLibrary( _In_ LPCTSTR lpFileName);
声明
VB6:
Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
VB.NET
Declare Unicode Function LoadLibrary Lib "kernel32" Alias "LoadLibraryW" (lpLibFileName As String) As IntPtr
说明
载入指定的动态程式库，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，成功则返回库模组的句柄，零表示失败。会设定GetLastError
参数 类型及说明
lpLibFileName String，指定要载入的动态程式库的名称。採用与CreateProcess函式的lpCommandLine参数指定的同样的搜寻顺序
注解
一旦不需要，用FreeLibrary函式释放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