CAD如何直接打印，不出现打印对话框？

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            function  myprint()

            {

                var axMxDrawX = document.getElementById("MxDrawXCtrl");

                var viewBound  = axMxDrawX.Call("Mx_GetViewCoord","");

                var printParam =  axMxDrawX.Call("Mx_NewResbuf","");                

                // 打印范围取当前视区显示内容                

                printParam.AddDouble(viewBound.AtDouble(1));

                printParam.AddDouble(viewBound.AtDouble(2));

                printParam.AddDouble(viewBound.AtDouble(3));

                printParam.AddDouble(viewBound.AtDouble(4));

                 var jpgWidth = viewBound.AtDouble(3) - viewBound.AtDouble(1);

                var jpgHeight = viewBound.AtDouble(4) - viewBound.AtDouble(2);                

                // 把jpg的宽度，高度，求文档坐标变成象素宽高.

                //var jpgWidth = axMxDrawX.CallDoubleParam1("Mx_DocLongToViewCoord",jpgWidth);

                // jpgWidth = jpgWidth.AtLong(1);

                //var jpgHeight = axMxDrawX.CallDoubleParam1("Mx_DocLongToViewCoord",jpgHeight);

                //jpgHeight = jpgHeight.AtLong(1);

                var printWidth = 50;

                var printHeight = 50;                

                if(jpgWidth > 1)

                    printHeight = printWidth * jpgHeight / jpgWidth;                

                    // 打印机名，取空就取系统默认的。                

                    printParam.AddString("");                

                    // 图纸名,取空就取系统默认的                

                    printParam.AddString("");                

                    // 打印的方向，2 为横向，1为纵向,默认取1

                printParam.AddLong(1);                

                // 打印区域的左上角X坐标，图纸单为mm

                printParam.AddLong(50);                

                // 打印区域的右下角X坐标，图纸单为mm

                printParam.AddLong(50 + printWidth );                

                // 打印区域的左上角Y坐标，图纸单为mm

                printParam.AddLong(50);                

                // 打印区域的右下角Y坐标，图纸单为mm

                printParam.AddLong(50 + printHeight);                

                // 打印的布局,为NULL就是模型Model中的内容

                printParam.AddString("");                

                // 打印配制，暂没有使用

                printParam.AddString("");                

                // 打印的文档名称，在用pdf虚拟打印机时，指定打印的pdf文件的缺省文件名

                printParam.AddString("");                

                // 前面打印参数说明:iFlag = 0表示页边距，iFlag = 1表示打印区域矩形框位置                printParam.AddLong(1);                // 开始打印                var ret = axMxDrawX.CallEx("Mx_Print",printParam);                if(ret.AtString(0) == "Ok")

                    alert("打印成功");

            }