使用 C# 将 SVG 转换为 PNG
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Converting SVG to PNG using C#
提问by harriyott
I've been trying to convert SVG images to PNG using C#, without having to write too much code. Can anyone recommend a library or example code for doing this?
我一直在尝试使用 C# 将 SVG 图像转换为 PNG，而无需编写太多代码。任何人都可以推荐一个库或示例代码来执行此操作吗？
采纳答案by Espo
You can call the command-line version of inkscape to do this:
您可以调用inkscape的命令行版本来执行此操作：
http://harriyott.com/2008/05/converting-svg-images-to-png-in-c.aspx
http://harriyott.com/2008/05/converting-svg-images-to-png-in-c.aspx
Also there is a C# SVG rendering engine, primarily designed to allow SVG files to be used on the web on codeplex that might suit your needs if that is your problem:
还有一个 C# SVG 渲染引擎，主要用于允许在 web 上使用 SVG 文件在 codeplex 上，如果这是您的问题，它可能适合您的需求：
Original Project
http://www.codeplex.com/svg
原始项目
http://www.codeplex.com/svg
Fork with fixes and more activity:(added 7/2013)
https://github.com/vvvv/SVG
Fork 修复和更多活动：（添加 7/2013）
https://github.com/vvvv/SVG
回答by stevenvh
I'm using Batikfor this. The complete Delphi code:
我为此使用蜡染。完整的德尔福代码：
procedure ExecNewProcess(ProgramName : String; Wait: Boolean);
var
StartInfo : TStartupInfo;
ProcInfo : TProcessInformation;
CreateOK : Boolean;
begin
FillChar(StartInfo, SizeOf(TStartupInfo), #0);
FillChar(ProcInfo, SizeOf(TProcessInformation), #0);
StartInfo.cb := SizeOf(TStartupInfo);
CreateOK := CreateProcess(nil, PChar(ProgramName), nil, nil, False,
CREATE_NEW_PROCESS_GROUP + NORMAL_PRIORITY_CLASS,
nil, nil, StartInfo, ProcInfo);
if CreateOK then begin
//may or may not be needed. Usually wait for child processes
if Wait then
WaitForSingleObject(ProcInfo.hProcess, INFINITE);
end else
ShowMessage('Unable to run ' + ProgramName);
CloseHandle(ProcInfo.hProcess);
CloseHandle(ProcInfo.hThread);
end;
procedure ConvertSVGtoPNG(aFilename: String);
const
ExecLine = 'c:\windows\system32\java.exe -jar C:\Apps\batik-1.7\batik-rasterizer.jar ';
begin
ExecNewProcess(ExecLine + aFilename, True);
end;
回答by stevenvh
you can use altsoft xml2pdf lib for this
您可以为此使用 altsoft xml2pdf lib
回答by nw.
When I had to rasterize svgs on the server, I ended up using P/Invoke to call librsvg functions (you can get the dlls from a windows version of the GIMP image editing program).
当我不得不在服务器上光栅化 svgs 时，我最终使用 P/Invoke 来调用 librsvg 函数（您可以从 GIMP 图像编辑程序的 Windows 版本中获取 dll）。
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool SetDllDirectory(string pathname);
[DllImport("libgobject-2.0-0.dll", SetLastError = true)]
static extern void g_type_init();
[DllImport("librsvg-2-2.dll", SetLastError = true)]
static extern IntPtr rsvg_pixbuf_from_file_at_size(string file_name, int width, int height, out IntPtr error);
[DllImport("libgdk_pixbuf-2.0-0.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
static extern bool gdk_pixbuf_save(IntPtr pixbuf, string filename, string type, out IntPtr error, __arglist);
public static void RasterizeSvg(string inputFileName, string outputFileName)
{
bool callSuccessful = SetDllDirectory("C:\Program Files\GIMP-2.0\bin");
if (!callSuccessful)
{
throw new Exception("Could not set DLL directory");
}
g_type_init();
IntPtr error;
IntPtr result = rsvg_pixbuf_from_file_at_size(inputFileName, -1, -1, out error);
if (error != IntPtr.Zero)
{
throw new Exception(Marshal.ReadInt32(error).ToString());
}
callSuccessful = gdk_pixbuf_save(result, outputFileName, "png", out error, __arglist(null));
if (!callSuccessful)
{
throw new Exception(error.ToInt32().ToString());
}
}
回答by Anish
There is a much easier way using the library http://svg.codeplex.com/(Newer version @GIT, @NuGet). Here is my code
使用库http://svg.codeplex.com/（较新版本 @ GIT，@ NuGet）有一种更简单的方法。这是我的代码
var byteArray = Encoding.ASCII.GetBytes(svgFileContents);
using (var stream = new MemoryStream(byteArray))
{
var svgDocument = SvgDocument.Open(stream);
var bitmap = svgDocument.Draw();
bitmap.Save(path, ImageFormat.Png);
}
回答by Michal Kieloch
To add to the response from @Anish, if you are having issues with not seeing the text when exporting the SVG to an image, you can create a recursive function to loop through the children of the SVGDocument, try to cast it to a SvgText if possible (add your own error checking) and set the font family and style.
要添加到@Anish 的响应中，如果您在将 SVG 导出到图像时没有看到文本的问题，您可以创建一个递归函数来循环遍历 SVGDocument 的子项，如果可能（添加您自己的错误检查）并设置字体系列和样式。
foreach(var child in svgDocument.Children)
{
SetFont(child);
}
public void SetFont(SvgElement element)
{
foreach(var child in element.Children)
{
SetFont(child); //Call this function again with the child, this will loop
//until the element has no more children
}
try
{
var svgText = (SvgText)parent; //try to cast the element as a SvgText
//if it succeeds you can modify the font
svgText.Font = new Font("Arial", 12.0f);
svgText.FontSize = new SvgUnit(12.0f);
}
catch
{
}
}
Let me know if there are questions.
如果有问题，请告诉我。
