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GetClassLongPtr (user32)
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C# Signature:
public static IntPtr GetClassLongPtr(HandleRef hWnd, int nIndex)
{
if (IntPtr.Size > 4)
return GetClassLongPtr64(hWnd, nIndex);
else
return new IntPtr(GetClassLongPtr32(hWnd, nIndex));
}
[DllImport("user32.dll", EntryPoint="GetClassLong")]
public static extern uint GetClassLongPtr32(HandleRef hWnd, int nIndex);
[DllImport("user32.dll", EntryPoint="GetClassLongPtr")]
public static extern IntPtr GetClassLongPtr64(HandleRef hWnd, int nIndex);
Because GetClassLong is not available on older 32-bit operating systems, a special wrapper function is required.
Testing the size of the IntPtr is the easiest way to determine if the platform is 64-bit.
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The GetClassLongPtr API
9/17/2009 5:45:29 AM - -64.111.150.32
The GetClassLongPtr API
9/17/2009 5:45:29 AM - -64.111.150.32
The GetClassLongPtr API
2/6/2012 12:06:34 AM - -202.74.138.1
The GetClassLongPtr API
2/6/2012 12:06:34 AM - -202.74.138.1
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
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