@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The SetClassLongPtr API !!!!C# Signature: public static IntPtr SetClassLong(HandleRef hWnd, int nIndex, IntPtr dwNewLong) { if (IntPtr.Size > 4) return SetClassLongPtr64(hWnd, nIndex, dwNewLong); else return new IntPtr(SetClassLongPtr32(hWnd, nIndex, unchecked((uint)dwNewLong.ToInt32()))); } [DllImport("user32.dll", EntryPoint="SetClassLong")] public static extern uint SetClassLongPtr32(HandleRef hWnd, int nIndex, uint dwNewLong); [DllImport("user32.dll", EntryPoint="SetClassLongPtr")] public static extern IntPtr SetClassLongPtr64(HandleRef hWnd, int nIndex, IntPtr dwNewLong); !!!!VB.NET Signature: <DllImport("user32.dll", EntryPoint:="SetClassLongPtrA", SetLastError:=True, CharSet:=CharSet.Ansi)> _ Public Function SetClassLongPtr(hWnd as IntPtr, <MarshalAs(UnmanagedType.I4)>nIndex as ClassLongFlags, newLong as Integer) as Integer End Function !!!!VB Signature: Public Declare Function SetClassLongPtr Lib "user32" Alias "SetClassLongPtrA" _ (ByVal hWnd As Long, _ ByVal nIndex As ClassLongFlags, _ ByVal dwNewLong As Long) As Long !!!!User-Defined Types: [ClassLongFlags] !!!!Notes: SetClassLongPtr is 64-bit safe, SetClassLong is not. Because SetClassLongPtr is not available on older 32-bit operating systems, a special wrapper function is required. The MSDN documentation specifies that SetClassLongPtr is supported on older 32-bit operating systems such as Windows 95. However, the Win32 API actually uses a macro to change SetClassLongPtr to SetClassLong on these older systems. Testing the size of the IntPtr is the easiest way to determine if the platform is 64-bit. !!!!Tips & Tricks: Please add some! !!!!Sample Code: Please add some! !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: SetClassLongPtr@msdn on MSDN
Edit user32.setclasslong
You do not have permission to change this page. If you feel this is in error, please send feedback with the contact link on the main page.