本文承接上半部分教程：LeadTools中文入門教程（3）：打印圖像（上） ，繼續(xù)講述如何使用LeadTools創(chuàng)建一個(gè)具有“打印圖像”功能的應(yīng)用程序。

16. 添加以下代碼至printPreviewToolStripMenuItem菜單項(xiàng)的Click事件：

 
 private void printPreviewToolStripMenuItem_Click(object sender, EventArgs e)
 {
       //設(shè)置打印文檔
       SetupPrintDocument();
              
       // 使用 .NET PrintPreviewDialog
       using(PrintPreviewDialog dlg = new PrintPreviewDialog())
       {
             // 顯示對(duì)話框
             dlg.Document = this._printDocument;
             dlg.WindowState = FormWindowState.Maximized;
             dlg.ShowDialog(this);
       }
 }

17. 將以下代碼添加到printSetupToolStripMenuItem菜單項(xiàng)的Click事件中：

 
 private void printSetupToolStripMenuItem_Click(object sender, EventArgs e)
 {
        // 使用.NET PageSetupDialog
        using(PageSetupDialog dlg = new PageSetupDialog())
        {
               dlg.Document = this._printDocument;
               dlg.ShowDialog(this);
        }
 }

18. 將以下代碼添加到printToolStripMenuItem菜單項(xiàng)的Click事件中：

 
 private void printToolStripMenuItem_Click(object sender, EventArgs e)
 {
       //用戶可能會(huì)使用快捷鍵，因此即使我們禁用了菜單項(xiàng)，也需要檢查打印狀態(tài)是否可用  
       if(rasterImageViewer1.Image == null)
       {
             return;
       }
              
       // 顯示打印預(yù)覽對(duì)話框，然后直接打印
              
       // 設(shè)置打印文檔
       SetupPrintDocument();
              
       this._printDocument.Print();
 }

19. 將以下代碼添加到exitToolStripMenuItem菜單項(xiàng)的Click事件中：

 
 private void exitToolStripMenuItem_Click(object sender, EventArgs e)
 {
       // 關(guān)閉應(yīng)用程序
       Close();
 }

20. 將以下代碼添加到pageToolStripMenuItem菜單項(xiàng)的DropDownOpening事件中：

 
 private void pageToolStripMenuItem_DropDownOpening(object sender, EventArgs e)
 {
       // 更新UI 狀態(tài)
       firstPageToolStripMenuItem.Enabled = (rasterImageViewer1.Image != null && rasterImageViewer1.Image.Page > 1);
       previousPageToolStripMenuItem.Enabled = firstPageToolStripMenuItem.Enabled;
       nextPageToolStripMenuItem.Enabled = (rasterImageViewer1.Image != null && rasterImageViewer1.Image.Page < rasterImageViewer1.Image.PageCount);
       lastPageToolStripMenuItem.Enabled = nextPageToolStripMenuItem.Enabled;
 }

21. 將以下代碼添加到firstPageToolStripMenuItem菜單項(xiàng)的Click事件中：

 private void firstPageToolStripMenuItem_Click(object sender, EventArgs e)
 {
       //轉(zhuǎn)到圖像的半島外圍網(wǎng)上直營(yíng)
       rasterImageViewer1.Image.Page = 1;
       UpdateCaption();
 }

22. 將以下代碼添加到previousPageToolStripMenuItem菜單項(xiàng)的Click事件中：

 
 private void previousPageToolStripMenuItem_Click(object sender, EventArgs e)
 {
       // 轉(zhuǎn)到圖像的上一頁
       rasterImageViewer1.Image.Page--;
       UpdateCaption();
 }

23. 將以下代碼添加到nextPageToolStripMenuItem菜單項(xiàng)的Click事件中：

 
 private void nextPageToolStripMenuItem_Click(object sender, EventArgs e)
 {
       // 轉(zhuǎn)到圖像的下一頁
       rasterImageViewer1.Image.Page++;
       UpdateCaption();
 }

24. 將以下代碼添加到lastPageToolStripMenuItem菜單項(xiàng)的Click事件中：

 private void lastPageToolStripMenuItem_Click(object sender, EventArgs e)
 {
       // 轉(zhuǎn)到圖像的尾頁
       rasterImageViewer1.Image.Page = rasterImageViewer1.Image.PageCount;
       UpdateCaption();
 }

25. 將以下代碼添加到usePageMarginsToolStripMenuItem菜單項(xiàng)的Click事件中：

 private void usePageMarginsToolStripMenuItem_Click(object sender, EventArgs e)
 {
       // 切換選項(xiàng)
       usePageMarginsToolStripMenuItem.Checked = !usePageMarginsToolStripMenuItem.Checked;
 }

26. 將以下代碼添加到fitImageToPageToolStripMenuItem菜單項(xiàng)的Click事件中：

 private void fitImageToPageToolStripMenuItem_Click(object sender, EventArgs e)
 {
       // 切換選項(xiàng)
       fitImageToPageToolStripMenuItem.Checked = !fitImageToPageToolStripMenuItem.Checked;
 }

27. 將以下代碼添加到Form1：

 
 private void UpdateCaption()
 {
       //更新演示的標(biāo)題，顯示加載的圖像文件名字和當(dāng)前頁碼                
       if(rasterImageViewer1.Image != null)
       {
             Text = string.Format(
             "{0} - 第 {1} 頁 (共 {2} 頁) - 打印圖像演示",
             this._currentImageFileName,
             rasterImageViewer1.Image.Page,
             rasterImageViewer1.Image.PageCount);
       }
       else
       {
             Text = "打印圖像演示";
       }
 }
              
 private void SetupPrintDocument()
 {
       //在打印預(yù)覽前或打印前調(diào)用，用于設(shè)置文檔             
       //最小值/最大值 為圖像的頁面數(shù)                
       this._printDocument.PrinterSettings.MinimumPage = 1;
       this._printDocument.PrinterSettings.MaximumPage = rasterImageViewer1.Image.PageCount;
              
       //默認(rèn)打印所有頁面
       this._printDocument.PrinterSettings.FromPage = this._printDocument.PrinterSettings.MinimumPage;
       this._printDocument.PrinterSettings.ToPage = this._printDocument.PrinterSettings.MaximumPage;
              
       //設(shè)置文檔名字
       this._printDocument.DocumentName = this._currentImageFileName;
 }
              
 private void _printDocument_BeginPrint(object sender, PrintEventArgs e)
 {
       // 重置頁碼為半島外圍網(wǎng)上直營(yíng)
       this._currentPrintPageNumber = 1;
 }
              
 private void _printDocument_PrintPage(object sender, PrintPageEventArgs e)
 {
       // 打印一頁
              
       // 獲取print document 對(duì)象
       PrintDocument document = sender as PrintDocument;
              
       // 創(chuàng)建一個(gè)新的LEADTOOLS image printer類
       RasterImagePrinter printer = new RasterImagePrinter();
              
        //設(shè)置 document 對(duì)象以便進(jìn)行頁面計(jì)算
       printer.PrintDocument = document;
              
       //檢查我們是否想要使圖像適應(yīng)
       if(fitImageToPageToolStripMenuItem.Checked)
       {
             //若為Yes, 將圖像調(diào)整到最大打印區(qū)域并居中
             printer.SizeMode = RasterPaintSizeMode.FitAlways;
             printer.HorizontalAlignMode = RasterPaintAlignMode.Center;
             printer.VerticalAlignMode = RasterPaintAlignMode.Center;
       }
       else
       {
             //若為No, 正常打印 (原始大小)
             printer.SizeMode = RasterPaintSizeMode.Normal;
             printer.HorizontalAlignMode = RasterPaintAlignMode.Near;
             printer.VerticalAlignMode = RasterPaintAlignMode.Near;
       }
              
       // 考慮具有不同水平和垂直分辨率的傳真圖像
       printer.UseDpi = true;
              
       // 打印整個(gè)圖像
       printer.ImageRectangle = Rectangle.Empty;
              
       //使用最大頁面維度，這和使用Windows照片庫打印等效                
       printer.PageRectangle = RectangleF.Empty;
       //無論我們是否要忽略頁邊距，都會(huì)通知打印機(jī)
       printer.UseMargins = usePageMarginsToolStripMenuItem.Checked;
              
       // 打印當(dāng)前頁
       printer.Print(rasterImageViewer1.Image, this._currentPrintPageNumber, e);
              
       // 轉(zhuǎn)到下一頁
       this._currentPrintPageNumber++;
              
       //無論我們是否要打印更多的頁面，都通知打印機(jī)                
       if(this._currentPrintPageNumber <= document.PrinterSettings.ToPage)
       {
             e.HasMorePages = true;
       }
       else
       {
             e.HasMorePages = false;
       }
 }
              
 private void _printDocument_EndPrint(object sender, PrintEventArgs e)
 {
       //此教程中此處不執(zhí)行任何操作
 }

28. 編譯并運(yùn)行程序。結(jié)果如下圖所示。

提醒：若您遇到"Invalid File Format" 或"Feature Not Supported"異常，請(qǐng)查閱參考文檔.

DEMO下載：

文章轉(zhuǎn)自：葡萄城控件產(chǎn)品博客，//blog.gcpowertools.com.cn

本文Demo提供了使用LeadTools打印圖像的全部代碼。為了運(yùn)行Demo代碼，請(qǐng)查看并免費(fèi)下載LeadTools試用版！

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