hwnd 是窗口句柄，系統分配的一個ID號，對操作系統來說就是這個窗口的唯一標識,通過它就可以操作WIN窗口了,LABVIEW VI的前面板無疑是一個WINDOWS窗口,那如何獲得這個窗口句柄那.

有兩種方法:

1.利用API FindWindow函數,通過窗口標題,來查找前面板的窗口句柄.

2.利用LABVIEW未公開的私有屬性節點

獲得了HWND,可以說獲得了控制前面板的鑰匙,舉幾個例子:

1.讀取窗口標題和設置窗口標題

Public Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hwnd As Long) As Long

Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long

Public Declare Function SetWindowText Lib "user32" Alias "SetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String) As Long

2.如何使窗口的最大最小化按紐失效

Public Const GWL_STYLE = (-16)

Public Const WS_MAXIMIZE = &H1000000

Public Const WS_MAXIMIZEBOX = &H10000

Public Const WS_MINIMIZE = &H20000000

Public Const WS_MINIMIZEBOX = &H20000

Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long

總結

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