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IsWindow

說明:
IsWindow 函式可用來檢查指定的視窗代碼(Handle)是否為合法有效之視窗


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 IsWindow Lib "user32" Alias "IsWindow" ( _
    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 呼叫成功的話,將會回傳非零的數值;若呼叫失敗的話,則回傳 0

.NET Framework API:


VB範例:

檢視原始碼 Visual Basic
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'VB的宣告
Private Declare Function IsWindow Lib "user32" ( _
	ByVal hwnd As Long _
	) As Long
 
Dim rtvl As Long
 
'檢查是否為合法有效之視窗
rtvl = IsWindow(Form1.hwnd)

RB範例:

檢視原始碼 REALBasic
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'RB的宣告
Declare Function IsWindow Lib "user32" ( _
	hwnd As Integer _
	) As Boolean
 
Dim rtvl As Boolean
 
'檢查是否為合法有效之視窗
rtvl = IsWindow(Window1.WinHWND)

VB.NET範例:

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'VB.NET的宣告
<DllImport("user32.dll")> _
Shared Function IsWindow( _
	ByVal hwnd As IntPtr _
	) As Boolean
End Function
 
Dim rtvl As Boolean
 
'檢查是否為合法有效之視窗
rtvl = IsWindow(Me.Handle)

C#範例:

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//C#的宣告
[DllImport("user32")]
public static extern bool IsWindow(
	IntPtr hwnd
	);
 
bool rtvl;
 
//檢查是否為合法有效之視窗
rtvl = IsWindow(this.Handle);

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