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int rf_card(int icdev,unsigned char _Mode,unsigned long *_Snr);
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[DllImport("mwrf32.dll")]
public static extern int rf_card(int icdev, byte _Mode, ref uint _Snr);

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public static extern int rf_card(int icdev, byte _Mode, out uint _Snr);
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public static extern int rf_card(IntPrt icdev, byte _Mode, ref uint _Snr);

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