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IsWindowVisible

說明:
IsWindowVisible 函式可用來判斷指定的視窗代碼(Handle)的狀態是顯示或隱藏


引用函式庫:
User32


適用系統:
Windows NT 3.1 或 Windows 95以上


函式原型:

Declare Function IsWindowVisible Lib "user32" Alias "IsWindowVisible" ( _
    ByVal hwnd As Long _
    ) As Long



參數型態及說明:
hwndLong 要檢查判斷的視窗代碼(Handle)

回傳值:
Long 若指定的視窗(Handle)為顯示狀態時,將會回傳非零的數值;反之則回傳 0

.NET Framework API:
System.Windows.Forms.Form.Visible


VB範例:

檢視原始碼 Visual Basic
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'VB的宣告
Private Declare Function IsWindowVisible Lib "user32" ( _
	ByVal hwnd As Long _
	) As Long
 
Dim rtvl As Long
 
'檢查視窗是否顯示或隱藏
rtvl = IsWindowVisible(Form1.hwnd)

RB範例:

檢視原始碼 REALBasic
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'RB的宣告
Declare Function IsWindowVisible Lib "user32" ( _
	hwnd As Integer _
	) As Boolean
 
Dim rtvl As Boolean
 
'檢查視窗是否顯示或隱藏
rtvl = IsWindowVisible(Window1.WinHWND)

VB.NET範例:

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'VB.NET的宣告
<DllImport("user32.dll")> _
Shared Function IsWindowVisible( _
	ByVal hwnd As IntPtr _
	) As Boolean
End Function
 
Dim rtvl As Boolean
 
'檢查視窗是否顯示或隱藏
rtvl = IsWindowVisible(Me.Handle)

C#範例:

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//C#的宣告
[DllImport("user32")]
public static extern bool IsWindowVisible(
	IntPtr hwnd
	);
 
bool rtvl;
 
//檢查視窗是否顯示或隱藏
rtvl = IsWindowVisible(this.Handle);

註釋:
雖然沒隱藏起來,但也有可能被其它視窗蓋住

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