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Summary

The GetWindowLongPtr API

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On this platform this function is in fact a macro that calls GetWindowLong, so the EntryPoint property has to be set to the real function:

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

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static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

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

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Private Shared Function GetWindowLongPtr(ByVal hWnd As HandleRef, <MarshalAs(UnmanagedType.I4)>nIndex As WindowLongFlags) As IntPtr

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Public Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" _

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

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private static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

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

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Private Shared Function GetWindowLongPtr(ByVal hWnd As HandleRef, <MarshalAs(UnmanagedType.I4)>nIndex As WindowLongFlags) As IntPtr

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Public Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" _

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

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private static extern IntPtr GetWindowLongPtr32(IntPtr hWnd, int nIndex);

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

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private static extern IntPtr GetWindowLongPtr64(IntPtr hWnd, int nIndex);

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// GetWindowLongPtr directly

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public static IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex)

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     return GetWindowLongPtr64(hWnd, nIndex);

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     return GetWindowLongPtr32(hWnd, nIndex);

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

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Private Shared Function GetWindowLongPtr32(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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

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Private Shared Function GetWindowLongPtr64(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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' This static method is required because Win32 does not support GetWindowLongPtr dirctly

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

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      Return GetWindowLongPtr64(hWnd, nIndex)

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      Return GetWindowLongPtr32(hWnd, nIndex)

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     result = GetWindowLongPtr(winhandle, GWL.GWL_ID);

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Documentation

[GetWindowLongPtr] on MSDN

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Summary

The GetWindowLongPtr API

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On this platform this function is in fact a macro that calls GetWindowLong, so the EntryPoint property has to be set to the real function:

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

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static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

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

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Private Shared Function GetWindowLongPtr(ByVal hWnd As HandleRef, <MarshalAs(UnmanagedType.I4)>nIndex As GWL) As IntPtr

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Public Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" _

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

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private static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

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

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Private Shared Function GetWindowLongPtr(ByVal hWnd As HandleRef, <MarshalAs(UnmanagedType.I4)>nIndex As GWL) As IntPtr

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Public Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" _

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

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private static extern IntPtr GetWindowLongPtr32(IntPtr hWnd, int nIndex);

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

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private static extern IntPtr GetWindowLongPtr64(IntPtr hWnd, int nIndex);

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// GetWindowLongPtr directly

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public static IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex)

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     return GetWindowLongPtr64(hWnd, nIndex);

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     return GetWindowLongPtr32(hWnd, nIndex);

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

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Private Shared Function GetWindowLongPtr32(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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

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Private Shared Function GetWindowLongPtr64(ByVal hWnd As HandleRef, ByVal nIndex As Integer) As IntPtr

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' This static method is required because Win32 does not support GetWindowLongPtr dirctly

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

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      Return GetWindowLongPtr64(hWnd, nIndex)

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      Return GetWindowLongPtr32(hWnd, nIndex)

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     result = GetWindowLongPtr(winhandle, GWL.GWL_ID);

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Documentation

[GetWindowLongPtr] on MSDN

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        SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) ^ WS_EX_LAYERED);

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  ll_Ret = GetWindowLong(ll_handle, GWL_EXSTYLE)

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// to the correct function (GetWindowLong in 32-bit mode and GetWindowLongPtr in 64-bit mode)

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Summary

This function retrieves information about the specified window. GetWindowLong also retrieves the 32-bit value at the specified offset into the extra window memory of a window.

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static extern System.UInt32 GetWindowLong(IntPtr  hWnd, int nIndex);

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static extern IntPtr GetWindowLong(IntPtr window, int index);

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    Private Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As System.UInt32

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Documentation

[GetWindowLong] on MSDN

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Summary

The joy of coding for .Net Compact Framework is that you often need to do some tweaks to obtain what is normally available in the Full Framework. One instance is wrapping the text of a button control so that it can appear on multiple lines. There's no property readily available at design time to allow this on the .Net Compact Framework and an alternative is to use SetWindowLong and GetWindowLong.

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private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

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Private Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer

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        style = GetWindowLong(hWnd, GWL_STYLE);

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    Private Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer

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    style = GetWindowLong(hWnd, GWL_STYLE)

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Summary

WindowLongFlags - Flags for GetWindowLong, GetWindowLongPtr, SetWindowLong & SetWindowLongPtr