MSDN.WhiteKnight - Stack Overflow answers
Ответ на "Как SVG сконвертировать в JPG или PNG на C#?"
Answer 811943
При наличии Internet Explorer 11 можно использовать COM-объекты MSHTML:
using System; using System.Collections.Generic; using System.Drawing; using System.Text; using System.Runtime.InteropServices; using System.ComponentModel; //Reference: System.Drawing //Reference: Microsoft HTML Object Library namespace SVG { public class SvgConvert { public static void ToPng(string svgcontent, string outpath) { RECTL rcClient = new RECTL(); bool b = SystemParametersInfo(SPI_GETWORKAREA, 0, ref rcClient, 0); if (b == false) { rcClient.bottom = 480; rcClient.right = 640; } int width = (int)(rcClient.right - rcClient.left); int height = (int)(rcClient.bottom - rcClient.top); IntPtr screendc = GetDC(IntPtr.Zero); string svghtml = "<html><head><meta http-equiv=\"X-UA-Compatible\" content=\"IE=11\" /></head><body>" + svgcontent + "</body></html>"; mshtml.HTMLDocument doc = null; mshtml.IHTMLDocument2 d2 = null; IOleObject pObj = null; IViewObject pView = null; try { doc = new mshtml.HTMLDocument(); //создание документа d2 = (mshtml.IHTMLDocument2)doc; int hr; //установка размера документа pObj = (IOleObject)d2; SIZEL sz = new SIZEL(); sz.x = (uint)MulDiv(width, HIMETRIC_INCH, GetDeviceCaps(screendc, LOGPIXELSX)); sz.y = (uint)MulDiv(height, HIMETRIC_INCH, GetDeviceCaps(screendc, LOGPIXELSY)); ; hr = pObj.SetExtent((int)System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT, ref sz); if (hr != 0) throw Marshal.GetExceptionForHR(hr); //запись SVG в документ d2.write(svghtml); d2.close(); //преобразование в Bitmap pView = (IViewObject)d2; Bitmap bmp = new Bitmap(width, height); Graphics g = Graphics.FromImage(bmp); using (g) { IntPtr hdc = g.GetHdc(); hr = pView.Draw((int)System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT, -1, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, hdc, ref rcClient, IntPtr.Zero, IntPtr.Zero, 0); if (hr != 0) throw Marshal.GetExceptionForHR(hr); g.ReleaseHdc(hdc); } //сохранение в PNG bmp.Save(outpath, System.Drawing.Imaging.ImageFormat.Png); } finally { //освобождение ресурсов if (d2 != null) Marshal.ReleaseComObject(d2); if (pObj != null) Marshal.ReleaseComObject(pObj); if (pView != null) Marshal.ReleaseComObject(pView); if (doc != null) Marshal.ReleaseComObject(doc); } } [DllImport("gdi32.dll")] static extern int GetDeviceCaps(IntPtr hdc, int nIndex); [DllImport("user32.dll")] static extern IntPtr GetDC(IntPtr hWnd); [DllImport("user32.dll")] static extern bool SystemParametersInfo(int nAction, int nParam, ref RECTL rc, int nUpdate); public static int MulDiv(int number, int numerator, int denominator) { return (int)(((long)number * numerator) / denominator); } const int LOGPIXELSX = 88; const int LOGPIXELSY = 90; const int HIMETRIC_INCH = 2540; const int SPI_GETWORKAREA = 48; } [ComImport()] [GuidAttribute("0000010d-0000-0000-C000-000000000046")] [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)] public interface IViewObject { int Draw([MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, IntPtr ptd, IntPtr hdcTargetDev, IntPtr hdcDraw, ref RECTL lprcBounds, IntPtr lprcWBounds, IntPtr pfnContinue, int dwContinue); int a(); int b(); int c(); int d(); int e(); } [ComImport()] [Guid("00000112-0000-0000-C000-000000000046")] [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IOleObject { void f(); void g(); void SetHostNames(object szContainerApp, object szContainerObj); void Close(uint dwSaveOption); void SetMoniker(uint dwWhichMoniker, object pmk); void GetMoniker(uint dwAssign, uint dwWhichMoniker, object ppmk); void x(); void y(); void DoVerb(uint iVerb, uint lpmsg, object pActiveSite, uint lindex, uint hwndParent, uint lprcPosRect); void EnumVerbs(ref object ppEnumOleVerb); void Update(); void IsUpToDate(); void GetUserClassID(uint pClsid); void GetUserType(uint dwFormOfType, uint pszUserType); int SetExtent(uint dwDrawAspect, ref SIZEL psizel); void GetExtent(uint dwDrawAspect, uint psizel); void Advise(object pAdvSink, uint pdwConnection); void Unadvise(uint dwConnection); void EnumAdvise(ref object ppenumAdvise); void GetMiscStatus(uint dwAspect, uint pdwStatus); void SetColorScheme(object pLogpal); }; public struct RECTL { public uint left; public uint top; public uint right; public uint bottom; } public struct SIZEL { public uint x; public uint y; } }
Использование:
string svgcontent = "<svg><circle cx=\"200\" cy=\"200\" r=\"150\" stroke=\"red\" fill=\"green\" stroke-width=\"10\"/></svg>"; SvgConvert.ToPng(svgcontent,"c:\\test\\svgimage.png");
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