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   public static extern int GetClassName(IntPtr hWnd, StringBuilder buf, int nMaxCount);

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   Declare Function GetClassName Lib "coredll.dll" _

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   GetClassName(hWnd, strClassName, strClassName.Capacity);

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Documentation

[GetClassName] on MSDN

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Summary

The GetClassName API

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static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName,int nMaxCount);

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Private Shared Function GetClassName(ByVal hWnd As System.IntPtr, _

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Public Declare Auto Function GetClassName Lib "User32.dll" (ByVal hwnd As IntPtr, _

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Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" _

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    nRet = GetClassName(hWnd, ClassName, ClassName.Capacity);

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   Call GetClassName(Me.Handle, sClassName, 256)

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Documentation

[GetClassName] on MSDN