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Summary

The GetClassLongPtr API

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public static IntPtr GetClassLongPtr(HandleRef hWnd, int nIndex)

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        return GetClassLongPtr64(hWnd, nIndex);

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        return new IntPtr(GetClassLongPtr32(hWnd, nIndex));

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public static extern uint GetClassLongPtr32(HandleRef hWnd, int nIndex);

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[DllImport("user32.dll", EntryPoint="GetClassLongPtr")]

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public static extern IntPtr GetClassLongPtr64(HandleRef hWnd, int nIndex);

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Public Shared Function GetClassLongPtr(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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        Return GetClassLongPtr64(hWnd, nIndex)

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        Return New IntPtr(GetClassLongPtr32(hWnd, nIndex))

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Public Shared Function GetClassLongPtr32(ByVal hWnd As HandleRef, <MarshalAs(UnmanagedType.I4)>nIndex As ClassLongFlags) As UInteger

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<DllImport("user32.dll", EntryPoint:="GetClassLongPtr")> _

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Public Shared Function GetClassLongPtr64(ByVal hWnd As HandleRef, <MarshalAs(UnmanagedType.I4)>nIndex As ClassLongFlags) As IntPtr

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Public Declare Function GetClassLongPtr Lib "user32"

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GetClassLongPtr is 64-bit safe, GetClassLong is not.

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Because GetClassLongPtr is not available on older 32-bit operating systems, a special wrapper function is required. The MSDN documentation specifies that GetClassLongPtr is supported on older 32-bit operating systems such as Windows 95. However, the Win32 API actually uses a macro to change GetClassLongPtr to GetClassLong on these older systems.

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Documentation

[GetClassLongPtr] on MSDN

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Summary

The GetClassLongPtr API

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public static IntPtr GetClassLongPtr(HandleRef hWnd, int nIndex)

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        return GetClassLongPtr64(hWnd, nIndex);

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        return new IntPtr(GetClassLongPtr32(hWnd, nIndex));

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public static extern uint GetClassLongPtr32(HandleRef hWnd, int nIndex);

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[DllImport("user32.dll", EntryPoint="GetClassLongPtr")]

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public static extern IntPtr GetClassLongPtr64(HandleRef hWnd, int nIndex);

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Public Shared Function GetClassLongPtr(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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        Return GetClassLongPtr64(hWnd, nIndex)

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        Return New IntPtr(GetClassLongPtr32(hWnd, nIndex))

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Public Shared Function GetClassLongPtr32(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As UInteger

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<DllImport("user32.dll", EntryPoint:="GetClassLongPtr")> _

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Public Shared Function GetClassLongPtr64(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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GetClassLongPtr is 64-bit safe, GetClassLong is not.

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Because GetClassLongPtr is not available on older 32-bit operating systems, a special wrapper function is required. The MSDN documentation specifies that GetClassLongPtr is supported on older 32-bit operating systems such as Windows 95. However, the Win32 API actually uses a macro to change GetClassLongPtr to GetClassLong on these older systems.

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Documentation

[GetClassLongPtr] on MSDN