PrintPage PrintPageEventHandler打印太多副本
我必须为我们公司生产的产品打印运输标签。
为了让我自己了解这些标签的结果，我使用Windows窗体进行设计。 这允许我使用Label控件定位我的文本，设置正确的字体等，添加自定义BarCode控件，并使用Panel控件“ 花哨 ”将项目分组到框中。
每页包含两（2）个标签。
当我的代码打印标签文档时，我要求2,4或6份副本。 有时，也会使用“打印预览”。 在这种情况下，我必须重置创建的标签数量。
但是，当文件打印时：
- 如果请求是2份，代码打印2张纸（4个标签）
- 如果请求是4份，代码打印8张纸（16个标签）
- 如果请求是6份，代码打印高达18页（36个标签）
有没有人看到一种模式？ 我不。
这是我的打印命令：
public int Print(string docName, int rows, int columns, int copies) { short shortCopies = (short)copies; LabelsHorizontal = rows; LabelsVertical = columns; Size docSize = PrintPreview.Document.DefaultPageSettings.Bounds.Size; float height = 0.8F * Screen.PrimaryScreen.WorkingArea.Size.Height; float width = (height * docSize.Width) / docSize.Height; Size winSize = new Size((int)width, (int)height); PrintPreview.Height = winSize.Height; PrintPreview.Width = winSize.Width; if (!String.IsNullOrEmpty(docName)) { PrintPreview.Document.DocumentName = docName; } PrintPreview.Document.PrinterSettings.Copies = shortCopies; PrintPreview.SettingsFilename = Settings.PageSettingsLocation; if (!PrintPreview.PrinterSelected) { if (PrintPreview.ShowPrinterSelectDialog() != DialogResult.OK) { return 0; } } labelQtyPrinted = 0; if (ShowPrintPreview) { PrintPreview.ShowDialog(); } else { PrintPreview.PrintDocument(); } return labelQtyPrinted; } // Resets the Label Count between PrintPreview and Print private void PrintPreview_OnPrintClicked(object sender, EventArgs e) { labelQtyPrinted = 0; }
我必须编写一个自定义的PrintPreview类，它将PrintPreviewDialog作为基类，以便我可以使用此printButton_Click方法覆盖其Print按钮：
// Handles the Printing of the Document internal void printButton_Click(object sender, EventArgs e) { if (OnPrintClicked != null) { OnPrintClicked(sender, e); // this resets my labelQtyPrinted value shown above } Document.Print(); printed = true; Close(); }
在Print方法（第一个代码片段）中， PrintPreview.PrintDocument()只是调用printButton_Click事件的代码。
我的PrintPageEventHandler如下所示：
private void Document_Printed(object sender, PrintPageEventArgs e) { if (PrintPreview.Document.PrinterSettings.Copies <= labelQtyPrinted) { throw new Exception("Run Away Printer"); } float scale; SizeF pageSize = new SizeF( PrintPreview.Document.DefaultPageSettings.PaperSize.Width, PrintPreview.Document.DefaultPageSettings.PaperSize.Height ); Margins m = PrintPreview.Document.DefaultPageSettings.Margins; float printableHeight = pageSize.Height - (m.Top + m.Bottom); float printableWidth = pageSize.Width - (m.Left + m.Right); if (printableWidth < printableHeight) { if (labelSize.Width < labelSize.Height) { float r1 = (printableWidth) / labelSize.Width; float r2 = (printableHeight) / labelSize.Height; scale = (r1 < r2) ? r1 : r2; } else { scale = (printableWidth) / labelSize.Width; } } else { if (labelSize.Width < labelSize.Height) { scale = (printableHeight) / labelSize.Height; } else { float r1 = (printableWidth) / labelSize.Width; float r2 = (printableHeight) / labelSize.Height; scale = (r1 < r2) ? r1 : r2; } } float lh = scale * labelSize.Height; float lw = scale * labelSize.Width; float ml = scale * m.Left; float mt = scale * m.Top; Graphics G = e.Graphics; G.SmoothingMode = smoothMode; G.TextRenderingHint = TextRenderingHint.AntiAlias; for (int i = 0; i < LabelsHorizontal; i++) { float dx = i * (lw + ml); // Horizontal shift * scale for (int j = 0; j < LabelsVertical; j++) { float dy = j * (lh + mt); // Vertical shift * scale #region ' Panels ' foreach (Panel item in panels) { float h = scale * item.Size.Height; float w = scale * item.Size.Width; float x = (ml + dx) + scale * item.Location.X; float y = (mt + dy) + scale * item.Location.Y; using (SolidBrush b = new SolidBrush(item.BackColor)) { G.FillRectangle(b, x, y, w, h); } using (Pen p = new Pen(Brushes.Black)) { G.DrawRectangle(p, x, y, w, h); } } #endregion #region ' Logo ' if (logo != null) { float h = scale * logo.Height; float w = scale * logo.Width; float x = (ml + dx) + scale * logoPt.X; float y = (mt + dy) + scale * logoPt.Y; G.DrawImage(logo, x, y, w, h); } #endregion #region ' Labels ' foreach (Label item in labels) { float h = scale * item.Size.Height; float w = scale * item.Size.Width; float x = (ml + dx) + scale * item.Location.X; float y = (mt + dy) + scale * item.Location.Y; Color c = PrintPreview.Document.DefaultPageSettings.Color ? item.ForeColor : Color.Black; Font font = new Font(item.Font.FontFamily, scale * item.Font.Size, item.Font.Style); using (SolidBrush b = new SolidBrush(c)) { StringFormat format = GetStringFormatFromContentAllignment(item.TextAlign); format.FormatFlags = StringFormatFlags.NoClip | StringFormatFlags.NoWrap; format.Trimming = StringTrimming.None; PointF locationF = new PointF(x, y); SizeF size = new SizeF(w, h); RectangleF r = new RectangleF(locationF, size); G.DrawString(item.Text, font, b, r, format); } } #endregion #region ' Barcodes ' foreach (AcpBarcodeControl item in barcodes) { Image img = item.GetBarcodeImage(item.BarcodeText); if (img != null) { float h = scale * item.Size.Height; float w = scale * item.Size.Width; float x = (ml + dx) + scale * item.Location.X; float y = (mt + dy) + scale * item.Location.Y; G.DrawImage(img, x, y, w, h); } } #endregion labelQtyPrinted++; if (labelQtyPrinted == PrintPreview.Document.PrinterSettings.Copies) { e.HasMorePages = false; return; } } e.HasMorePages = (labelQtyPrinted < PrintPreview.Document.PrinterSettings.Copies); } }
总而言之，它运作良好。 永远不会抛出“Run Away Printer”exception。
那么，为什么要制作这么多的副本呢？
打印机是HP LaserJet 4050，如果这有任何区别的话。
我知道了！
开心辞典！
好吧，如果有人关心，这是交易：我需要每页打印两（2）个标签。
我要做的是使用垂直和水平打印的标签数量来计算要打印的页数。
我添加了变量labelsRequested并将现有变量labelQtyPrinted更改为labelsPrinted ：
private int labelsPrinted; private int labelsRequested;
我的公共Print方法已更改为：
public int Print(string docName, int rows, int columns, int copies) { LabelsHorizontal = rows; LabelsVertical = columns; if (!String.IsNullOrEmpty(docName)) { PrintPreview.Document.DocumentName = docName; } labelsRequested = copies; //PrintPreview.Document.PrinterSettings.Copies = (short)copies; PrintPreview.SettingsFilename = Settings.PageSettingsLocation; if (!PrintPreview.PrinterSelected) { if (PrintPreview.ShowPrinterSelectDialog() != DialogResult.OK) { return 0; } } if (ShowPrintPreview) { Size docSize = PrintPreview.Document.DefaultPageSettings.Bounds.Size; float height = 0.8F * Screen.PrimaryScreen.WorkingArea.Size.Height; float width = (height * docSize.Width) / docSize.Height; Size winSize = new Size((int)width, (int)height); PrintPreview.Height = winSize.Height; PrintPreview.Width = winSize.Width; PrintPreview.Document.PrinterSettings.Copies = (short)labelsRequested; // this may cause problems PrintPreview.ShowDialog(); } else { PrintPreview.PrintDocument(); } return labelsPrinted; }
现在，我没有像以前那样添加print_Click事件处理程序，而是连接了Document的BeginPrint和EndPrint如下所示：
void Document_BeginPrint(object sender, PrintEventArgs e) { labelsPrinted = 0; float fPerPage = LabelsHorizontal * LabelsVertical; if (1 < fPerPage) { float fQty = labelsRequested; float fTotal = fQty / fPerPage; PrintPreview.Document.PrinterSettings.Copies = (short)fTotal; } } void Document_EndPrint(object sender, PrintEventArgs e) { Printed = (labelsPrinted == labelsRequested); }
但是，这里的关键显然来自于我试图在PrintPage事件处理程序中设置HasMorePages值。
“为什么？” 你问。 因为我只打印了相同的1页大小的文档的多个副本。 如果我的一个文档跨越多个页面，那么我需要确保设置了HasMorePages 。
不用多说了，这是我的PrintPage事件处理程序（请注意，很多代码都是非常通用的，可以很容易地编辑为其他人工作）：
private void Document_Printed(object sender, PrintPageEventArgs e) { float scale; SizeF pageSize = new SizeF( PrintPreview.Document.DefaultPageSettings.PaperSize.Width, PrintPreview.Document.DefaultPageSettings.PaperSize.Height ); Margins m = PrintPreview.Document.DefaultPageSettings.Margins; float printableHeight = pageSize.Height - (m.Top + m.Bottom); float printableWidth = pageSize.Width - (m.Left + m.Right); if (printableWidth < printableHeight) { if (labelSize.Width < labelSize.Height) { float r1 = printableWidth / labelSize.Width; float r2 = printableHeight / labelSize.Height; scale = (r1 < r2) ? r1 : r2; } else { scale = printableWidth / labelSize.Width; } } else { if (labelSize.Width < labelSize.Height) { scale = (printableHeight) / labelSize.Height; } else { float r1 = printableWidth / labelSize.Width; float r2 = printableHeight / labelSize.Height; scale = (r1 < r2) ? r1 : r2; } } float lh = scale * labelSize.Height; float lw = scale * labelSize.Width; float ml = scale * m.Left; float mt = scale * m.Top; Graphics G = e.Graphics; G.SmoothingMode = smoothMode; G.TextRenderingHint = TextRenderingHint.AntiAlias; for (int i = 0; (i < LabelsHorizontal) && !e.Cancel; i++) { float dx = i * (lw + ml); // Horizontal shift * scale for (int j = 0; (j < LabelsVertical) && !e.Cancel; j++) { float dy = j * (lh + mt); // Vertical shift * scale #region ' Panels ' foreach (Panel item in panels) { float h = scale * item.Size.Height; float w = scale * item.Size.Width; float x = (ml + dx) + scale * item.Location.X; float y = (mt + dy) + scale * item.Location.Y; using (SolidBrush b = new SolidBrush(item.BackColor)) { G.FillRectangle(b, x, y, w, h); } using (Pen p = new Pen(Brushes.Black)) { G.DrawRectangle(p, x, y, w, h); } } #endregion #region ' Logo ' if (logo != null) { float h = scale * logo.Height; float w = scale * logo.Width; float x = (ml + dx) + scale * logoPt.X; float y = (mt + dy) + scale * logoPt.Y; G.DrawImage(logo, x, y, w, h); } #endregion #region ' Labels ' foreach (Label item in labels) { float h = scale * item.Size.Height; float w = scale * item.Size.Width; float x = (ml + dx) + scale * item.Location.X; float y = (mt + dy) + scale * item.Location.Y; Color c = PrintPreview.Document.DefaultPageSettings.Color ? item.ForeColor : Color.Black; Font font = new Font(item.Font.FontFamily, scale * item.Font.Size, item.Font.Style); using (SolidBrush b = new SolidBrush(c)) { StringFormat format = GetStringFormatFromContentAllignment(item.TextAlign); format.FormatFlags = StringFormatFlags.NoClip | StringFormatFlags.NoWrap; format.Trimming = StringTrimming.None; PointF locationF = new PointF(x, y); SizeF size = new SizeF(w, h); RectangleF r = new RectangleF(locationF, size); G.DrawString(item.Text, font, b, r, format); } } #endregion #region ' Barcodes ' foreach (AcpBarcodeControl item in barcodes) { Image img = item.GetBarcodeImage(item.BarcodeText); if (img != null) { float h = scale * item.Size.Height; float w = scale * item.Size.Width; float x = (ml + dx) + scale * item.Location.X; float y = (mt + dy) + scale * item.Location.Y; G.DrawImage(img, x, y, w, h); } } #endregion labelsPrinted++; } } }