coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for SetWindowLong in other DLLs exists, click on Find References to the right.

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.

C# Signature:

[DllImport("Coredll.dll", SetLastError=true)]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
[DllImport("Coredll.dll", SetLastError=true)]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

VB Signature:

<DllImport("Coredll.dll"SetLastError=True)> _
Private Shared Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer
<DllImport("Coredll.dll"SetLastError=True)> _
Private Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

    private const int GWL_STYLE = -16;
    private const int BS_CENTER = 0x00000300;
    private const int BS_VCENTER = 0x00000C00;
    private const int BS_MULTILINE = 0x00002000;

    public static void SetButtonStyle(Button ctrl)
    {
        IntPtr hWnd;
        int style;

        ctrl.Capture = true;
        hWnd = GetCapture();
        ctrl.Capture = false;

        style = GetWindowLong(hWnd, GWL_STYLE);
        SetWindowLong(hWnd, GWL_STYLE, (style | BS_CENTER | BS_VCENTER | BS_MULTILINE));

        ctrl.Refresh();
    }

Documentation

SetWindowLong on MSDN

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