16. 添加以下代码至printPreviewToolStripMenuItem菜单项的Click事件：
private void printPreviewToolStripMenuItem_Click(object sender, EventArgs e) { //设置打印文档 SetupPrintDocument(); // 使用 .NET PrintPreviewDialog using(PrintPreviewDialog dlg = new PrintPreviewDialog()) { // 显示对话框 dlg.Document = this._printDocument; dlg.WindowState = FormWindowState.Maximized; dlg.ShowDialog(this); } }
17. 将以下代码添加到printSetupToolStripMenuItem菜单项的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. 将以下代码添加到printToolStripMenuItem菜单项的Click事件中：
private void printToolStripMenuItem_Click(object sender, EventArgs e) { //用户可能会使用快捷键，因此即使我们禁用了菜单项，也需要检查打印状态是否可用 if(rasterImageViewer1.Image == null) { return; } // 显示打印预览对话框，然后直接打印 // 设置打印文档 SetupPrintDocument(); this._printDocument.Print(); }
19. 将以下代码添加到exitToolStripMenuItem菜单项的Click事件中：
private void exitToolStripMenuItem_Click(object sender, EventArgs e) { // 关闭应用程序 Close(); }
20. 将以下代码添加到pageToolStripMenuItem菜单项的DropDownOpening事件中：
private void pageToolStripMenuItem_DropDownOpening(object sender, EventArgs e) { // 更新UI 状态 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. 将以下代码添加到firstPageToolStripMenuItem菜单项的Click事件中：
private void firstPageToolStripMenuItem_Click(object sender, EventArgs e) { //转到图像的首页 rasterImageViewer1.Image.Page = 1; UpdateCaption(); }
22. 将以下代码添加到previousPageToolStripMenuItem菜单项的Click事件中：
private void previousPageToolStripMenuItem_Click(object sender, EventArgs e) { // 转到图像的上一页 rasterImageViewer1.Image.Page--; UpdateCaption(); }
23. 将以下代码添加到nextPageToolStripMenuItem菜单项的Click事件中：
private void nextPageToolStripMenuItem_Click(object sender, EventArgs e) { // 转到图像的下一页 rasterImageViewer1.Image.Page++; UpdateCaption(); }
24. 将以下代码添加到lastPageToolStripMenuItem菜单项的Click事件中：
private void lastPageToolStripMenuItem_Click(object sender, EventArgs e) { // 转到图像的尾页 rasterImageViewer1.Image.Page = rasterImageViewer1.Image.PageCount; UpdateCaption(); }
25. 将以下代码添加到usePageMarginsToolStripMenuItem菜单项的Click事件中：
private void usePageMarginsToolStripMenuItem_Click(object sender, EventArgs e) { // 切换选项 usePageMarginsToolStripMenuItem.Checked = !usePageMarginsToolStripMenuItem.Checked; }
26. 将以下代码添加到fitImageToPageToolStripMenuItem菜单项的Click事件中：
private void fitImageToPageToolStripMenuItem_Click(object sender, EventArgs e) { // 切换选项 fitImageToPageToolStripMenuItem.Checked = !fitImageToPageToolStripMenuItem.Checked; }
27. 将以下代码添加到Form1：
private void UpdateCaption() { //更新演示的标题，显示加载的图像文件名字和当前页码 if(rasterImageViewer1.Image != null) { Text = string.Format( "{0} - 第 {1} 页 (共 {2} 页) - 打印图像演示", this._currentImageFileName, rasterImageViewer1.Image.Page, rasterImageViewer1.Image.PageCount); } else { Text = "打印图像演示"; } } private void SetupPrintDocument() { //在打印预览前或打印前调用，用于设置文档 //最小值/最大值 为图像的页面数 this._printDocument.PrinterSettings.MinimumPage = 1; this._printDocument.PrinterSettings.MaximumPage = rasterImageViewer1.Image.PageCount; //默认打印所有页面 this._printDocument.PrinterSettings.FromPage = this._printDocument.PrinterSettings.MinimumPage; this._printDocument.PrinterSettings.ToPage = this._printDocument.PrinterSettings.MaximumPage; //设置文档名字 this._printDocument.DocumentName = this._currentImageFileName; } private void _printDocument_BeginPrint(object sender, PrintEventArgs e) { // 重置页码为首页 this._currentPrintPageNumber = 1; } private void _printDocument_PrintPage(object sender, PrintPageEventArgs e) { // 打印一页 // 获取print document 对象 PrintDocument document = sender as PrintDocument; // 创建一个新的LEADTOOLS image printer类 RasterImagePrinter printer = new RasterImagePrinter(); //设置 document 对象以便进行页面计算 printer.PrintDocument = document; //检查我们是否想要使图像适应 if(fitImageToPageToolStripMenuItem.Checked) { //若为Yes, 将图像调整到最大打印区域并居中 printer.SizeMode = RasterPaintSizeMode.FitAlways; printer.HorizontalAlignMode = RasterPaintAlignMode.Center; printer.VerticalAlignMode = RasterPaintAlignMode.Center; } else { //若为No, 正常打印 (原始大小) printer.SizeMode = RasterPaintSizeMode.Normal; printer.HorizontalAlignMode = RasterPaintAlignMode.Near; printer.VerticalAlignMode = RasterPaintAlignMode.Near; } // 考虑具有不同水平和垂直分辨率的传真图像 printer.UseDpi = true; // 打印整个图像 printer.ImageRectangle = Rectangle.Empty; //使用最大页面维度，这和使用Windows照片库打印等效 printer.PageRectangle = RectangleF.Empty; //无论我们是否要忽略页边距，都会通知打印机 printer.UseMargins = usePageMarginsToolStripMenuItem.Checked; // 打印当前页 printer.Print(rasterImageViewer1.Image, this._currentPrintPageNumber, e); // 转到下一页 this._currentPrintPageNumber++; //无论我们是否要打印更多的页面，都通知打印机 if(this._currentPrintPageNumber <= document.PrinterSettings.ToPage) { e.HasMorePages = true; } else { e.HasMorePages = false; } } private void _printDocument_EndPrint(object sender, PrintEventArgs e) { //此教程中此处不执行任何操作 }
28. 编译并运行程序。结果如下图所示。
提醒：若您遇到”Invalid File Format” 或”Feature Not Supported”异常，请查阅参考文档Invalid File Format/Feature Not Supported.
DEMO下载：
PrintImageTutorial.zip
文章转自：葡萄城控件产品博客，http://blog.gcpowertools.com.cn
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