我使用CefSharp的SchemeHandler来使用自定义网址(例如.css
.js
,.png
或custom://cefsharp/assets/css/style.css
个文件
我有两个自定义类来存档。
第一个类,MyCustomSchemeHandlerFactory
将是处理自定义Scheme的那个,它看起来像这样,其中“custom”将是自定义方案:
internal class MyCustomSchemeHandlerFactory : ISchemeHandlerFactory
{
public const string SchemeName = "custom";
public IResourceHandler Create(IBrowser browser, IFrame frame, string schemeName, IRequest request)
{
return new MyCustomSchemeHandler();
}
}
我实现的下一个课程是MyCustomSchemeHandler
,它将接收调用并输出响应,它看起来像这样:
internal class MyCustomSchemeHandler : IResourceHandler
{
private static readonly IDictionary<string, string> ResourceDictionary;
private string mimeType;
private MemoryStream stream;
static MyCustomSchemeHandler()
{
ResourceDictionary = new Dictionary<string, string>
{
{ "/home.html", Properties.Resources.index},
{ "/assets/css/style.css", Properties.Resources.style}
};
}
public Stream Stream { get; set; }
public int StatusCode { get; set; }
public string StatusText { get; set; }
public string MimeType { get; set; }
public NameValueCollection Headers { get; private set; }
public Stream GetResponse(IResponse response, out long responseLength, out string redirectUrl)
{
redirectUrl = null;
responseLength = -1;
response.MimeType = MimeType;
response.StatusCode = StatusCode;
response.StatusText = StatusText;
response.ResponseHeaders = Headers;
var memoryStream = Stream as MemoryStream;
if (memoryStream != null)
{
responseLength = memoryStream.Length;
}
return Stream;
}
public bool ProcessRequestAsync(IRequest request, ICallback callback)
{
// The 'host' portion is entirely ignored by this scheme handler.
var uri = new Uri(request.Url);
var fileName = uri.AbsolutePath;
string resource;
if (ResourceDictionary.TryGetValue(fileName, out resource) && !string.IsNullOrEmpty(resource))
{
var resourceHandler = ResourceHandler.FromString(resource);
stream = (MemoryStream)resourceHandler.Stream;
var fileExtension = Path.GetExtension(fileName);
mimeType = ResourceHandler.GetMimeType(fileExtension);
callback.Continue();
return true;
}
else
{
callback.Dispose();
}
return false;
}
void GetResponseHeaders(IResponse response, out long responseLength, out string redirectUrl)
{
responseLength = stream == null ? 0 : stream.Length;
redirectUrl = null;
response.StatusCode = (int)HttpStatusCode.OK;
response.StatusText = "OK";
response.MimeType = mimeType;
}
bool ReadResponse(Stream dataOut, out int bytesRead, ICallback callback)
{
//Dispose the callback as it's an unmanaged resource, we don't need it in this case
callback.Dispose();
if (stream == null)
{
bytesRead = 0;
return false;
}
//Data out represents an underlying buffer (typically 32kb in size).
var buffer = new byte[dataOut.Length];
bytesRead = stream.Read(buffer, 0, buffer.Length);
dataOut.Write(buffer, 0, buffer.Length);
return bytesRead > 0;
}
bool CanGetCookie(Cookie cookie)
{
return true;
}
bool CanSetCookie(Cookie cookie)
{
return true;
}
void Cancel()
{
}
}
在这个类中,我定义了一个自定义资源字典,它将指示资源中的哪个文件将被使用,正如我在第一个例子中所述,custom://cefsharp/assets/css/style.css
应该加载资源Properties.Resources.style
,问题是,一旦我进入特定的网址,没有任何东西被加载,我试图输出mimeType,它可以工作,但不知何故文件本身将无法正确输出。我的实施有问题吗?
另外我试图以以下形式输出原始文件:
if (ResourceDictionary.TryGetValue(fileName, out resource) && !string.IsNullOrEmpty(resource))
{
MessageBox.Show(resource);
}
它输出正确的文件没有任何问题。
要加载自定义Scheme,请在初始化CefSharp之前使用以下代码:
var settings = new CefSettings();
settings.RegisterScheme(new CefCustomScheme
{
SchemeName = MyCustomSchemeHandlerFactory.SchemeName,
SchemeHandlerFactory = new MyCustomSchemeHandlerFactory()
});
以上课程基于以下链接: MyCustomSchemeHandlerFactory:FlashResourceHandlerFactory.cs MyCustomSchemeHandler:CefSharpSchemeHandler.cs和ResourceHandler.cs
答案 0 :(得分:4)
如果您只需要返回一个字符串,那么您可以使用ResourceHandler.FromString(html, mimeType)
。为此,您只需要实现ISchemeHandlerFactory
。
https://github.com/cefsharp/CefSharp/blob/cefsharp/47/CefSharp/ResourceHandler.cs#L98
从文件https://github.com/cefsharp/CefSharp/blob/cefsharp/47/CefSharp.Example/CefSharpSchemeHandlerFactory.cs#L17读取的示例,可以简单地将其转换为从字符串中读取。
答案 1 :(得分:4)
由于Cefsharp在过去几个月中发生了一些变化,因此这是一种处理“文件”协议的更新且更简单的方法。我在这件事上写了blog post。
您想要添加的是您的方案处理程序及其工厂:
using System;
using System.IO;
using CefSharp;
namespace MyProject.CustomProtocol
{
public class CustomProtocolSchemeHandler : ResourceHandler
{
// Specifies where you bundled app resides.
// Basically path to your index.html
private string frontendFolderPath;
public CustomProtocolSchemeHandler()
{
frontendFolderPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "./bundle/");
}
// Process request and craft response.
public override bool ProcessRequestAsync(IRequest request, ICallback callback)
{
var uri = new Uri(request.Url);
var fileName = uri.AbsolutePath;
var requestedFilePath = frontendFolderPath + fileName;
if (File.Exists(requestedFilePath))
{
byte[] bytes = File.ReadAllBytes(requestedFilePath);
Stream = new MemoryStream(bytes);
var fileExtension = Path.GetExtension(fileName);
MimeType = GetMimeType(fileExtension);
callback.Continue();
return true;
}
callback.Dispose();
return false;
}
}
public class CustomProtocolSchemeHandlerFactory : ISchemeHandlerFactory
{
public const string SchemeName = "customFileProtocol";
public IResourceHandler Create(IBrowser browser, IFrame frame, string schemeName, IRequest request)
{
return new CustomProtocolSchemeHandler();
}
}
}
然后在调用之前注册 Cef.Initialize:
var settings = new CefSettings
{
BrowserSubprocessPath = GetCefExecutablePath()
};
settings.RegisterScheme(new CefCustomScheme
{
SchemeName = CustomProtocolSchemeHandlerFactory.SchemeName,
SchemeHandlerFactory = new CustomProtocolSchemeHandlerFactory()
});