Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Printing / DefaultPrintController.cs / 1 / DefaultPrintController.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Printing { using Microsoft.Win32; using System.ComponentModel; using System; using System.Diagnostics; using System.Drawing; using System.Drawing.Internal; using System.Runtime.InteropServices; using CodeAccessPermission = System.Security.CodeAccessPermission; ////// /// public class StandardPrintController : PrintController { private DeviceContext dc; private Graphics graphics; private void CheckSecurity(PrintDocument document) { if (document.PrinterSettings.PrintDialogDisplayed) { IntSecurity.SafePrinting.Demand(); } else if (document.PrinterSettings.IsDefaultPrinter) { IntSecurity.DefaultPrinting.Demand(); } else { IntSecurity.AllPrinting.Demand(); } } ///Specifies a print controller that sends information to a printer. /// ////// /// public override void OnStartPrint(PrintDocument document, PrintEventArgs e) { Debug.Assert(dc == null && graphics == null, "PrintController methods called in the wrong order?"); // For security purposes, don't assume our public methods methods are called in any particular order CheckSecurity(document); base.OnStartPrint(document, e); // the win32 methods below SuppressUnmanagedCodeAttributes so assertin on UnmanagedCodePermission is redundant if (!document.PrinterSettings.IsValid) throw new InvalidPrinterException(document.PrinterSettings); dc = document.PrinterSettings.CreateDeviceContext(modeHandle); SafeNativeMethods.DOCINFO info = new SafeNativeMethods.DOCINFO(); info.lpszDocName = document.DocumentName; if (document.PrinterSettings.PrintToFile) info.lpszOutput = document.PrinterSettings.OutputPort; //This will be "FILE:" else info.lpszOutput = null; info.lpszDatatype = null; info.fwType = 0; int result = SafeNativeMethods.StartDoc(new HandleRef(this.dc, dc.Hdc), info); if (result <= 0) { int error = Marshal.GetLastWin32Error(); if (error == SafeNativeMethods.ERROR_CANCELLED) { e.Cancel = true; } else { throw new Win32Exception(error); } } } ////// Implements StartPrint for printing to a physical printer. /// ////// /// public override Graphics OnStartPage(PrintDocument document, PrintPageEventArgs e) { Debug.Assert(dc != null && graphics == null, "PrintController methods called in the wrong order?"); // For security purposes, don't assume our public methods methods are called in any particular order CheckSecurity(document); base.OnStartPage(document, e); try { IntSecurity.AllPrintingAndUnmanagedCode.Assert(); e.PageSettings.CopyToHdevmode(modeHandle); IntPtr modePointer = SafeNativeMethods.GlobalLock(new HandleRef(this, modeHandle)); try { IntPtr result = SafeNativeMethods.ResetDC(new HandleRef(this.dc, dc.Hdc), new HandleRef(null, modePointer)); Debug.Assert(result == dc.Hdc, "ResetDC didn't return the same handle I gave it"); } finally { SafeNativeMethods.GlobalUnlock(new HandleRef(this, modeHandle)); } } finally { CodeAccessPermission.RevertAssert(); } // int horizontalResolution = Windows.GetDeviceCaps(dc.Hdc, SafeNativeMethods.HORZRES); // int verticalResolution = Windows.GetDeviceCaps(dc.Hdc, SafeNativeMethods.VERTRES); graphics = Graphics.FromHdcInternal( dc.Hdc ); if (graphics != null && document.OriginAtMargins) { // Adjust the origin of the graphics object to be at the // user-specified margin location // int dpiX = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, dc.Hdc), SafeNativeMethods.LOGPIXELSX); int dpiY = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, dc.Hdc), SafeNativeMethods.LOGPIXELSY); int hardMarginX_DU = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, dc.Hdc), SafeNativeMethods.PHYSICALOFFSETX); int hardMarginY_DU = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(this.dc, dc.Hdc), SafeNativeMethods.PHYSICALOFFSETY); float hardMarginX = hardMarginX_DU * 100 / dpiX; float hardMarginY = hardMarginY_DU * 100 / dpiY; graphics.TranslateTransform(-hardMarginX, -hardMarginY); graphics.TranslateTransform(document.DefaultPageSettings.Margins.Left, document.DefaultPageSettings.Margins.Top); } int result2 = SafeNativeMethods.StartPage(new HandleRef(this.dc, dc.Hdc)); if (result2 <= 0) throw new Win32Exception(); return graphics; } ////// Implements StartPage for printing to a physical printer. /// ////// /// public override void OnEndPage(PrintDocument document, PrintPageEventArgs e) { Debug.Assert(dc != null && graphics != null, "PrintController methods called in the wrong order?"); // For security purposes, don't assume our public methods methods are called in any particular order CheckSecurity(document); IntSecurity.UnmanagedCode.Assert(); try { int result = SafeNativeMethods.EndPage(new HandleRef(this.dc, dc.Hdc)); if (result <= 0) throw new Win32Exception(); } finally { CodeAccessPermission.RevertAssert(); graphics.Dispose(); // Dispose of GDI+ Graphics; keep the DC graphics = null; } base.OnEndPage(document, e); } ////// Implements EndPage for printing to a physical printer. /// ////// /// public override void OnEndPrint(PrintDocument document, PrintEventArgs e) { Debug.Assert(dc != null && graphics == null, "PrintController methods called in the wrong order?"); // For security purposes, don't assume our public methods methods are called in any particular order CheckSecurity(document); IntSecurity.UnmanagedCode.Assert(); try { if (dc != null) { try { int result = (e.Cancel) ? SafeNativeMethods.AbortDoc(new HandleRef(dc, dc.Hdc)) : SafeNativeMethods.EndDoc(new HandleRef(dc, dc.Hdc)); if (result <= 0) throw new Win32Exception(); } finally { dc.Dispose(); dc = null; } } } finally { CodeAccessPermission.RevertAssert(); } base.OnEndPrint(document, e); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved./// Implements EndPrint for printing to a physical printer. /// ///
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