VectorDraw Developer Framework（VDF）是一个用于应用程序可视化的图形引擎库。有了VDF提供的功能，您可以轻松地创建、编辑、管理、输出、输入和打印2D和3D图形文件。 VectorDraw Developer Framework试用版下载
问：
有关于多线程的打印问题，应该如何解决？
答：
已改进了顺序调用vddocument不同实例的方法以在多线程项目中工作，一个线程用于每个不同的vdDocument。
Example:
using System;
using System.Threading;
using VectorDraw.Professional.Components;
using VectorDraw.Professional.vdObjects;
using System.Windows.Forms;
using VectorDraw.Generics;namespace MultiPrint
{
class Program
{
const string ExportExtension = ".pdf";
//const string ExportExtension = ".svg";
//const string ExportExtension = ".jpg";
//const string ExportExtension = ".emf";
//const string ExportExtension = ".bmp";
//const string ExportExtension = ".png";
//const string ExportExtension = ".HPG"; //const string ExportExtension = ".dxf";
public static bool IsPrintExportFormat
{
get
{
return
(string.Compare(ExportExtension, "", true) == 0
|| string.Compare(ExportExtension, ".jpg", true) == 0
|| string.Compare(ExportExtension, ".pdf", true) == 0
|| string.Compare(ExportExtension, ".svg", true) == 0
|| string.Compare(ExportExtension, ".emf", true) == 0
|| string.Compare(ExportExtension, ".HPG", true) == 0
|| string.Compare(ExportExtension, ".png", true) == 0
|| string.Compare(ExportExtension, ".bmp", true) == 0
);
}
}
[STAThread]
static void Main(string[] args)
{
Console.BufferWidth = 180; FolderBrowserDialog folderbrowser = new FolderBrowserDialog();
folderbrowser.RootFolder = Environment.SpecialFolder.Desktop;
folderbrowser.SelectedPath = Environment.CurrentDirectory;
DialogResult res = folderbrowser.ShowDialog(); if (res != DialogResult.OK) return;
string argument = folderbrowser.SelectedPath + @"\";
string folder = System.IO.Path.GetDirectoryName(argument);
Environment.CurrentDirectory = folder;
if (folder == null || folder == string.Empty || !System.IO.Directory.Exists(folder)) throw new Exception("Pass an existing folder as argument.");
string[] files = System.IO.Directory.GetFiles(folder, "*.*", System.IO.SearchOption.TopDirectoryOnly); vdArray<string> filenames = new vdArray<string>();
foreach (string filename in files)
{
if (filename.EndsWith(".vdcl", StringComparison.InvariantCultureIgnoreCase)
|| filename.EndsWith(".vdml", StringComparison.InvariantCultureIgnoreCase)
|| filename.EndsWith(".dwg", StringComparison.InvariantCultureIgnoreCase)
|| filename.EndsWith(".dxf", StringComparison.InvariantCultureIgnoreCase)
)
{
filenames.AddItem(filename);
}
}
string message = "SelectedFiles :";
foreach (string item in filenames)
{
message += string.Format("\n{0}", item);
}
message += string.Format("\n\n Continue Exporting to {0} ?", ExportExtension);
res = MessageBox.Show(message, "Selected Files", MessageBoxButtons.YesNo);
if (res == DialogResult.No) return;
int i = 0; foreach (string item in filenames)
{
BeginNewPrintJob(item, i); i++;
}
}
static void BeginNewPrintJob(string filename, int jobid)
{
DocumentJob job = new DocumentJob(jobid); Thread thread = new Thread(new ParameterizedThreadStart(job.PrintFile));
thread.Name = "PrintJob : " + filename;
thread.SetApartmentState(ApartmentState.MTA);
thread.Start(filename);
}
class DocumentJob
{
int lineNo = 0;
public DocumentJob(int jobId)
{
lineNo = jobId;
}
public void PrintFile(object Params)
{
string fname = Params as string;
PrintMessage(string.Format("{0,-40} ", System.IO.Path.GetFileName(fname)) + "Start"); vdDocumentComponent DocComponent = new vdDocumentComponent();
vdDocument document = DocComponent.Document;
document.FileName = fname;
document.OnPrompt += new vdDocument.PromptEventHandler(document_OnPrompt);
document.OnProgress += new VectorDraw.Professional.Utilities.ProgressEventHandler(document_OnProgress);
document.GenericError += new vdDocument.GenericErrorEventHandler(document_GenericError);
document.OnLoadUnknownFileName += new vdDocument.LoadUnknownFileName(document_OnLoadUnknownFileName);
document.OnIsValidOpenFormat += new vdDocument.IsValidOpenFormatEventHandler(document_OnIsValidOpenFormat);
document.OnSaveUnknownFileName += new vdDocument.SaveUnknownFileName(document_OnSaveUnknownFileName);
document.OnGetSaveFileFilterFormat += new vdDocument.GetSaveFileFilterFormatEventHandler(document_OnGetSaveFileFilterFormat);
bool success = document.Open(fname);
if (success)
{
success = false;
if (IsPrintExportFormat)
{
vdPrint printer = document.Model.Printer;
printer.PrinterName = System.IO.Path.GetDirectoryName(fname) + @"\" + System.IO.Path.GetFileNameWithoutExtension(fname) + ExportExtension;
printer.paperSize = new System.Drawing.Rectangle(0, 0, 827, 1169);//A4
printer.LandScape = false;
printer.PrintExtents();
printer.PrintScaleToFit();
printer.CenterDrawingToPaper();
printer.PrintOut();
success = true;
}
else
{
if (string.Compare(ExportExtension, System.IO.Path.GetExtension(fname)) != 0)
success = document.SaveAs(System.IO.Path.GetDirectoryName(fname) + @"\" + System.IO.Path.GetFileNameWithoutExtension(fname) + ExportExtension);
}
}
if (success) PrintMessage(string.Format("{0,-40} ", System.IO.Path.GetFileName(document.FileName)) + "Finish");
else PrintMessage("Error Exporting " + fname);
document.OnPrompt -= new vdDocument.PromptEventHandler(document_OnPrompt);
document.OnProgress -= new VectorDraw.Professional.Utilities.ProgressEventHandler(document_OnProgress);
document.GenericError -= new vdDocument.GenericErrorEventHandler(document_GenericError);
document.OnLoadUnknownFileName -= new vdDocument.LoadUnknownFileName(document_OnLoadUnknownFileName);
document.OnIsValidOpenFormat -= new vdDocument.IsValidOpenFormatEventHandler(document_OnIsValidOpenFormat);
document.OnSaveUnknownFileName -= new vdDocument.SaveUnknownFileName(document_OnSaveUnknownFileName);
document.OnGetSaveFileFilterFormat -= new vdDocument.GetSaveFileFilterFormatEventHandler(document_OnGetSaveFileFilterFormat);
DocComponent.Dispose();
} void document_OnGetSaveFileFilterFormat(ref string saveFilter)
{
saveFilter = "*.vdml|*.vdcl|*.dxf|*.dwg|*.svg|*.pdf|*.emf|*.HPG|*.bmp|*.jpg|*.png||"; }
void document_OnSaveUnknownFileName(object sender, string fileName, out bool success)
{
success = false;
vdDocument document = sender as vdDocument;
if (fileName.EndsWith(".dwg", StringComparison.InvariantCultureIgnoreCase))
{
success = vdxFcnv.ConversionUtilities.SaveDwg(document, fileName);
}
else if (fileName.EndsWith(".dxf", StringComparison.InvariantCultureIgnoreCase))
{
vdDXF.vdDXFSAVE dxf = new vdDXF.vdDXFSAVE();
success = dxf.SaveDXF(document, fileName);
}
} void document_OnIsValidOpenFormat(object sender, string extension, ref bool success)
{
if (extension.EndsWith(".dwg", StringComparison.InvariantCultureIgnoreCase) ||
extension.EndsWith(".dxf", StringComparison.InvariantCultureIgnoreCase))
{
success = true;
}
} void document_OnLoadUnknownFileName(object sender, string fileName, out bool success)
{
success = false;
vdDocument document = sender as vdDocument;
if (fileName.EndsWith(".dwg", StringComparison.InvariantCultureIgnoreCase))
{
success = vdxFcnv.ConversionUtilities.OpenDwg(document, fileName);
}
else if (fileName.EndsWith(".dxf", StringComparison.InvariantCultureIgnoreCase))
{
success = vdDXF.vdDXFopen.LoadFromStream(document, new System.IO.FileStream(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.None));
}
}
void PrintMessage(string message)
{
message = message.Replace("\r\n", "");
message = message.Replace("\n", "");
message += new string(' ', Console.BufferWidth - message.Length);
lock (Console.Out)
{
Console.SetCursorPosition(0, lineNo);
Console.Out.Write(message);
}
}
void document_GenericError(object sender, string Membername, string errormessage)
{
vdDocument document = sender as vdDocument;
PrintMessage(string.Format("{0,-40} ", System.IO.Path.GetFileName(document.FileName)) + Membername + errormessage);
}
void document_OnProgress(object sender, long percent, string jobDescription)
{
if (percent == 0) percent = 100;
vdDocument document = sender as vdDocument;
PrintMessage(string.Format("{0,-40} ", System.IO.Path.GetFileName(document.FileName)) + jobDescription + " : " + percent.ToString() + "%");
} void document_OnPrompt(object sender, ref string promptstr)
{
if (promptstr == null) return;
string str = promptstr;
str = str.Trim();
if (str == string.Empty) return;
vdDocument document = sender as vdDocument;
PrintMessage(string.Format("{0,-40} ", System.IO.Path.GetFileName(document.FileName)) + str);
}
}
}
}
对于以上问答，如果您有任何的疑惑都可以在评论区留言，我们会及时回复。此系列的问答教程我们会持续更新，如果您感兴趣，可以多多关注本教程。
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