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Summary

The GetRegionData API

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static extern int GetRegionData(IntPtr hRgn, uint dwCount, IntPtr lpRgnData);

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    // First we call GetRegionData() with a null buffer.

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    int dataSize = GetRegionData(hRgn, 0, IntPtr.Zero);

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      // Allocate as much space as the GetRegionData call

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      int retValue = GetRegionData(hRgn, dataSize, bytes);

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Documentation

[GetRegionData] on MSDN