Using the BitBlt function in .NET

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Listing 142 Using the BitBlt function
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private void Form1_Load(object sender, SystemEventArgs e) { Graphics g1 = thisCreateGraphics(); Graphics g2 = null; try { g1SmoothingMode = SmoothingModeAntiAlias; g1DrawLine(new Pen(ColorBlack, 2), 10, 10, 150, 10);
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g1DrawLine(new Pen(ColorBlack, 2), 10, 10, 10, 150); g1FillRectangle(BrushesBlue, 30, 30, 70, 70); g1FillEllipse(new HatchBrush (HatchStyleDashedDownwardDiagonal, ColorRed, ColorGreen), 110, 110, 100, 100 ); Bitmap curBitmap = new Bitmap( thisClientRectangleWidth, thisClientRectangleHeight, g1); g2 = GraphicsFromImage(curBitmap); IntPtr hdc1 = g1GetHdc(); IntPtr hdc2 = g2GetHdc(); BitBlt(hdc2, 0, 0, thisClientRectangleWidth, thisClientRectangleHeight, hdc1, 0, 0, 13369376); g1ReleaseHdc(hdc1); g2ReleaseHdc(hdc2); curBitmapSave("f:\\BitBltImgjpg", ImageFormatJpeg); } catch (Exception exp) { MessageBoxShow(expMessageToString()); } finally { g2Dispose(); g1Dispose(); } }
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1413 Using GDI Print Functionality
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We discussed NET printing functionality in 11, but what about using GDI printing in managed code One reason for using GDI may be speed and familiarity with GDI or having more control over the printer Until now we have been selecting objects such as fonts and lines and then drawing on a page, which is then printed out Keep in mind that all the fonts you can use within the NET environment have to be TrueType fonts Before TrueType came along, there was something called PCL (Printer Control Language), also known as bitmap fonts So what's the difference , you may ask It's simple: A PCL or bitmap font is made up of patterns of dots that represent each letter The problem is that a different PCL font was required for every size of letter needed, such as 12, 14, and so on Different PCL fonts were needed even for italic and bold versions! As you can imagine, it was necessary to have lots of PCL fonts to maintain the flexibility we take for granted today TrueType fonts, on the other hand, are a lot more flexible The reason is that the fonts are mathematical representations of each letter rather than a pattern of dots If I decide I need a Times New Roman font at size 20, the font is simply recalculated rather than just a different pattern of dots being loaded What happens if your printer does not support the TrueType font you have selected The only way to print it is to send what you want to print to the printer as graphics, which can be time-consuming if you're creating large printouts
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The code in Listing 143 does a few new things For one, it uses Win32 APIs to talk directly to the printer, which gives us the best possible speed Finally, it demonstrates the use of PCL5 commands to draw a box on the page Using the code in Listing 143, you would be able to create detailed pages consisting of multiple fonts and graphics The nice thing is that they can all be created by just sending text to the printer rather than using graphics commands You may want to change the printer before you test this code The following line of code specifies the printer:
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PrintDirectOpenPrinter("\\\\1921681101\\hpl", ref lhPrinter,0);
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Listing 143 Using GDI print functionality in a managed application
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// PrintDirectcs // Shows how to write data directly to the // printer using Win32 APIs // This code sends Hewlett-Packard PCL5 codes // to the printer to print // out a rectangle in the middle of the page using System; using SystemText; using SystemRuntimeInteropServices;
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[StructLayout( LayoutKindSequential)] public struct DOCINFO { [MarshalAs(UnmanagedTypeLPWStr)] public string pDocName; [MarshalAs(UnmanagedTypeLPWStr)] public string pOutputFile; [MarshalAs(UnmanagedTypeLPWStr)] public string pDataType; } public class PrintDirect { [ DllImport( "winspooldrv", CharSet=CharSetUnicode,ExactSpelling=false, CallingConvention=CallingConventionStdCall )] public static extern long OpenPrinter(string pPrinterName, ref IntPtr phPrinter, int pDefault); [ DllImport( "winspooldrv", CharSet=CharSetUnicode,ExactSpelling=false, CallingConvention=CallingConventionStdCall )] public static extern long StartDocPrinter(IntPtr hPrinter, int Level, ref DOCINFO pDocInfo); [ DllImport( "winspooldrv", CharSet=CharSetUnicode,ExactSpelling=true, CallingConvention=CallingConventionStdCall)]
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public static extern long StartPagePrinter( IntPtr hPrinter); [ DllImport( "winspooldrv", CharSet=CharSetAnsi, ExactSpelling=true, CallingConvention=CallingConventionStdCall)] public static extern long WritePrinter(IntPtr hPrinter, string data, int buf, ref int pcWritten); [ DllImport( "winspooldrv" , CharSet=CharSetUnicode,ExactSpelling=true, CallingConvention=CallingConventionStdCall)] public static extern long EndPagePrinter(IntPtr hPrinter); [ DllImport( "winspooldrv" , CharSet=CharSetUnicode, ExactSpelling=true, CallingConvention=CallingConventionStdCall)] public static extern long EndDocPrinter(IntPtr hPrinter); [ DllImport( "winspooldrv", CharSet=CharSetUnicode,ExactSpelling=true, CallingConvention=CallingConventionStdCall )] public static extern long ClosePrinter(IntPtr hPrinter); }
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public class App { public static void Main() { SystemIntPtr lhPrinter = new SystemIntPtr(); DOCINFO di = new DOCINFO(); int pcWritten=0; string st1; // Text to print with a form-feed character st1="This is an example of printing " + "directly to a printer\f"; dipDocName="my test document"; dipDataType="RAW"; // The "\x1b" means an ASCII escape character st1="\x1b*c600a6b0P\f"; // lhPrinter contains the handle for the printer opened // If lhPrinter is 0, then an error has occurred PrintDirectOpenPrinter("\\\\1921681101\\hpl", ref lhPrinter,0); PrintDirectStartDocPrinter(lhPrinter,1,ref di); PrintDirectStartPagePrinter(lhPrinter); try { // Moves the cursor 900 dots (3 inches at // 300 dpi) in from the left margin, and // 600 dots (2 inches at 300 dpi) down
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// from the top margin st1="\x1b*p900x600Y"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Using the print model commands for rectangle // dimensions, "600a" specifies a rectangle // with a horizontal size, or width, of 600 dots, // and "6b" specifies a vertical // size, or height, of 6 dots "0P" selects the // solid black rectangular area fill st1="\x1b*c600a6b0P"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Specifies a rectangle with width of // 6 dots, height of 600 dots, and a // fill pattern of solid black st1="\x1b*c6a600b0P"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Moves the current cursor position to // 900 dots from the left margin and // 1200 dots down from the top margin st1="\x1b*p900x1200Y"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Specifies a rectangle with a width // of 606 dots, a height of 6 dots, and a // fill pattern of solid black st1="\x1b*c606a6b0P"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Moves the current cursor position to 1500 // dots in from the left margin and // 600 dots down from the top margin st1="\x1b*p1500x600Y"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Specifies a rectangle with a width of 6 dots, // a height of 600 dots, and a // fill pattern of solid black st1="\x1b*c6a600b0P"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); // Send a form-feed character to the printer st1="\f"; PrintDirectWritePrinter(lhPrinter, st1, st1Length, ref pcWritten); } catch (Exception e) { ConsoleWriteLine(eMessage);
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