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  3. VectorDraw入门必备手册（十八）：关于多线程的打印问题

VectorDraw入门必备手册（十八）：关于多线程的打印问题

mac2025-08-07  11

   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);             }         }     } }

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