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bool bSendMsg(HANDLE hComm,char *szMsg,char *szPhNbr,char *szSCA,int iSMSFormat,char *szNextMsg,char *szErrInfo);

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struct STRUCommInfo
{
      int iBaudRate;
      char szSCA[30];
};
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[DllImport("SMSCom.dll", EntryPoint = "bSendMsg")]
public static extern bool bSendMsg(IntPtr hComm,string szMsg,string szPhNbr,string szSCA,int iSMSFormat,  StringBuilder szNextMsg, StringBuilder szErrInfo);
   


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[StructLayout(LayoutKind.Sequential)]
    public struct STRUCommInfo
    {
      public  int iBaudRate;
      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]   
      public string szSCA;
    }

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