我正在使用带有 DB2 后端的 ASP .Net 3.5 MVC1。我的公司正在尝试从 Microsoft SQL Server 2008 RSCLient Print GDI+ 对话框打印条形码。我们无法将文件保存为 PDF 并在本地打印,因为这是用于我们的物理库存应用程序,并且员工可能会使用本地条形码做坏事(它们是很好的检查),因此我们被迫通过 HTTP 打印并控制它们的打印. 每个商店都有一个打印服务器,但 Web 服务器位于公司 IT 办公室。我相信我必须使用 .jpeg,因为 .gif 会导致条码中的线条模糊,扫描枪无法读取。
该应用程序使用几百个标签(大约 5 页和大约 5 分钟完成打印假脱机)工作正常,但打印 2000 个标签需要 2 小时(接近 300 页约 +150 MB)。我在应用程序上运行 Wireshark 以尝试捕获来回的数据包,并将信息传递给网络,这就是他们的响应。
不。时间源目标协议信息 36628 653.373235 HTTP [TCP 窗口已满] 持续或非 HTTP 流量 36630 654.245430 TCP [TCP ZeroWindowProbe] http > 35503 [ACK] Seq=26291213 Ack=3730 Win=63137 Len=1
我离题了。我的问题是我可以使用什么类型的策略来帮助加快通过 HTTP 的打印假脱机。我应该在 X 页“切掉”打印线轴并重新线轴其余部分吗?我应该改变我的打印算法吗?有什么方法可以在不损失 .jpeg 质量的情况下缩小我的打印线轴尺寸?是否有 RSClientPrint 的开源或商业替代方案来处理我需要的业务逻辑?
现在是为了编码!如果您还需要什么,请告诉我!
[AcceptVerbs(HttpVerbs.Post)]
[Authorization(Roles = Roles.NonInquiry)]
public ActionResult ReprintLabels(int eventId, int areaCode, int lowerLabelNumber, int upperLabelNumber)
{
if (!_eventAreaService.IsAreaEditable(eventId, areaCode))
return RedirectToAction("Index", new { eventId = eventId });
var printContext = _eventAreaService.ReprintLabels(eventId, areaCode, lowerLabelNumber, upperLabelNumber);
ActionResult result = RedirectToAction("Index", new { eventId = eventId });
if (printContext != null)
{
var redirectUrl = Url.RouteUrl(new { controller = "EventArea", action = "Index", eventId = eventId });
Session[PrintContextViewModel.SessionKey] = new PrintContextViewModel(printContext, redirectUrl);
result = RedirectToAction("PrintLabels", "LabelPrint");
}
return result;
}
public InventoryAreaPrintContext ReprintLabels(int eventId, int areaCode, int lowerLabelBound, int upperLabelBound)
{
var user = _authentication.CurrentUser;
if (user.IsInRole(Roles.CorporateInquiry) || user.IsInRole(Roles.StoreInquiry))
throw new InvalidOperationException("User must be a non-inquiry role.");
List<Fixture> fixturesToVoid = GetLabelsInRange(eventId, areaCode, lowerLabelBound, upperLabelBound).Where(f => f.StatusCode == FixtureStatus.Ready).ToList();
if (fixturesToVoid.Count < 1) return null;
// Void all old labels and tally the labels that to be recreated
// for each area involved.
var voidFixturesByArea = new Dictionary<int, int>();
foreach (var f in fixturesToVoid)
{
if (!voidFixturesByArea.ContainsKey(f.AreaCode))
voidFixturesByArea[f.AreaCode] = 1;
else
voidFixturesByArea[f.AreaCode]++;
f.StatusCode = FixtureStatus.VoidReplace;
_fixtureRepo.Update(f);
}
var storeEvent = _storeEventRepository.FindEvent(user.DefaultStore, eventId);
var lastUsedLabel = storeEvent.LastUsedLabelNumber;
var affectedAreas = new List<InventoryArea>();
// Create new labels for the affected areas.
foreach (var pair in voidFixturesByArea)
{
var area = _areaRepo.FindByKey(user.DefaultStore.GroupCode, user.DefaultStore.ID, eventId, pair.Key);
var fixtures = _fixtureBuilder.AddFixtures(lastUsedLabel.Value, area, pair.Value);
fixtures.ForEach(f => _fixtureRepo.Insert(f));
area.Fixtures = fixtures;
affectedAreas.Add(area);
}
// Update the store event counts.
var numberOfLabels = fixturesToVoid.Count();
storeEvent.LastUsedLabelNumber += numberOfLabels;
_storeEventRepository.Update(storeEvent);
return new InventoryAreaPrintContext(_barcodeGenerator) { InventoryAreas = affectedAreas, StoreEvent = storeEvent, Store = user.DefaultStore };
}
public class BarcodeGenerator : IBarcodeGenerator
{
private readonly BarCodeImage.CodeSetEncoder _codeSetEncoder;
public BarcodeGenerator(BarCodeImage.CodeSetEncoder codeSetEncoder)
{
_codeSetEncoder = codeSetEncoder;
}
public byte[] CreateBarcode(string barcodeText)
{
byte[] data;
var generator = new BarCodeImage(barcodeText, _codeSetEncoder, true)
{
InsetText = false,
Font = new Font(
FontFamily.GenericSansSerif,
10,
FontStyle.Regular,
GraphicsUnit.Pixel)
};
/**
* Keep the image dimensions at the same ratio as they will be displayed in the report.
* Currently the report is set to a height to width ratio of 1/5 so we set the image
* height to width at 1/5 as well. Otherwise the barcode will not scan properly.
**/
using (var image = generator.Render(50, 250))
using (var ms = new MemoryStream())
{
image.Save(ms, ImageFormat.Jpeg);
data = ms.GetBuffer();
}
return data;
}
}