RDLC报表打印

Question

各位高手，RDLC打印中获取打印机的时候执行一段代码时候出现了一个问题，有相同使用 EMFStreamPrintDocument进行打印的高手帮忙看一下，谢谢大家了.
internal static PRINTER_INFO_2[] EnumPrintersByFlag(PrinterEnumFlags Flags)
        {
            uint cbNeeded = 0;
            uint cReturned = 0;
            bool ret = EnumPrinters(Flags, null, 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned);            IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
            ret = EnumPrinters(Flags, null, 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned);            if (ret)
            {
                PRINTER_INFO_2[] Info2 = new PRINTER_INFO_2[cReturned];                int offset = pAddr.ToInt32();                for (int i = 0; i < cReturned; i++)
                {
                    Info2[i].pServerName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pPrinterName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pShareName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pPortName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pDriverName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pComment = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pLocation = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pDevMode = Marshal.ReadIntPtr(new IntPtr(offset));
                    offset += 4;
                    Info2[i].pSepFile = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4; ----------------------------------------------------------------
执行下面的某一个设置属性就会出现  算数运算导致溢出，之后的情况就是无法获取到打印机了!
----------------------------------------------------------------                    Info2[i].pPrintProcessor = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pDatatype = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pParameters = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pSecurityDescriptor = Marshal.ReadIntPtr(new IntPtr(offset));
                    offset += 4;
                    Info2[i].Attributes = (uint )Marshal.ReadIntPtr(new IntPtr(offset));
                    offset += 4;
                    Info2[i].Priority = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].DefaultPriority = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].StartTime = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].UntilTime = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].Status = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].cJobs = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].AveragePPM = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;                }                Marshal.FreeHGlobal(pAddr);                return Info2;            }
            else
            {
                return new PRINTER_INFO_2[0];
            }
        }