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GetUpdateRect (user32)
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C# Signature:
[DllImport("user32.dll")]
public extern static bool GetUpdateRect(IntPtr hWnd, ref RECT rect, bool bErase);
static extern bool GetUpdateRect(HandleRef hWnd, out RECT rect, [MarshalAs(UnmanagedType.Bool)] bool bErase);
VB.NET Signature:
<DllImport("user32.dll")> _
Private Shared Function GetUpdateRect(ByVal hWnd As IntPtr, ByRef rect As RECT, ByVal bErase As Boolean) As Boolean
End Function
Public Declare Function GetUpdateRect Lib "user32" (hWnd As System.IntPtr, ByRef rc As RECT, <MarshalAs(UnmanagedType.Bool)> fErase As Boolean) As <MarshalAs(UnmanagedType.Bool)> Boolean
Dim rRect As New RECT
Dim bErase As Boolean
GetUpdateRect(Me.Handle, rRect, bErase)
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Alternative Managed API:
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Sample Code:
VB.NET :
Dim rRect As New RECT
Dim bErase As Boolean
GetUpdateRect(Me.Handle, rRect, bErase)
Alternative Managed API:
Do you know one? Please contribute it!
The GetUpdateRect API
6/7/2016 7:55:27 AM - jnm2-74.212.46.188
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
A HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native method is done with it.
7/22/2009 9:41:44 AM - -212.251.139.186
The GetUpdateRect API
6/7/2016 7:55:27 AM - jnm2-74.212.46.188
ByRef is a VB keyword that specifies a variable to be passed as a parameter BY REFERENCE. In other words, the pointer to the variable is passed and any change to its value made within the function or sub will change its value outside the function/sub.
4/25/2007 3:19:29 AM - anonymous
The RECT structure defines the coordinates of the upper-left and lower-right corners of a rectangle.
6/3/2013 5:41:04 PM - dahminator-75.174.65.168
The RECT structure defines the coordinates of the upper-left and lower-right corners of a rectangle.
6/3/2013 5:41:04 PM - dahminator-75.174.65.168
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