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| using RegisterClassEx |
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| Messages |
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Related Types |
This message was discovered on microsoft.public.dotnet.framework.interop.
| Eric Bouchard |
Hello !
Is there anyway to call RegisterClassEx function in user32.lib with managed
code ?
[DllImport("USER32")]
private static extern int RegisterClassEx(ref WNDCLASSEX wcex);
public delegate int WNDPROC(IntPtr hWnd, uint uMessage, UIntPtr wPraram,
IntPtr lParam);
[StructLayout(LayoutKind.Sequential)]
public class WNDCLASSEX {
public uint cbSize = 48;
public uint style = 0;
[MarshalAs(UnmanagedType.FunctionPtr)] public WNDPROC lpfnWndProc;
public int cbClsExtra = 0;
public int cbWndExtra = 0;
public IntPtr hInstance = IntPtr.Zero;
public IntPtr hIcon = IntPtr.Zero;
public IntPtr hCursor = IntPtr.Zero;
public IntPtr hbrBackground = IntPtr.Zero;
[MarshalAs(UnmanagedType.LPTStr)] public string lpszMenuName = null;
[MarshalAs(UnmanagedType.LPTStr)] public string lpszClassName = null;
public IntPtr hIconSm = IntPtr.Zero;
}
and when I call RegisterClassEx, a non zero value is retured, and
GetLastError is 126
(The specified module could not be found.)
can anyone help me ?
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| Mattias Sjögren |
Eric,
[Original message clipped]
Of course there is :-)
[Original message clipped]
wcex should only be a ref parameter if WNDCLASSEX is defined as a
value type (struct). When you make it a reference type (class), you
should change it to a by value parameter, decorated with
[MarshalAs(UnmanagedType.LPStruct)].
> public uint cbSize = 48;
Magic numbers are bad! ;-) I suggest you use Marshal.SizeOf instead.
[Original message clipped]
You can't rely on what GetLastError returns in managed code. Instead,
you should add SetLastError=true to the function's DllImport
attribute, and then check the error code with
Marshal.GetLastWin32Error after the call.
Mattias
===
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.
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