Question

我已经编写了一个本地DataSource，因为据我所知，Awesomium中没有包含，但问题是它从数据源html，图像等请求所有内容我不知道如何加载所有类型的mime格式。我当前的代码只支持html / text，我将文件加载到二进制文件中并作为响应发送。这不适用于图像。

有人知道我应该从哪里开始吗？

class LocalDataSource : 
    public Awesomium::DataSource
{
public:
    LocalDataSource() { }
    virtual ~LocalDataSource() { }

    virtual void OnRequest(int request_id, const Awesomium::WebString& path)
    {
        std::string filepath = Awesomium::ToString(path).insert(0, "./");
        std::basic_ifstream<char> is(filepath, std::ios_base::in | std::ios_base::binary);
        if (is)
        {
            is.seekg(0, is.end);
            int length = is.tellg();
            is.seekg(0, is.beg);

            char *buffer = new char[length + 1];
            is.read(buffer, length);
            buffer[length] = '\0';
            is.close();

            SendResponse(request_id, strlen(buffer), (unsigned char*)buffer, Awesomium::WSLit("text/html"));
            delete[] buffer;
        }
        else
        {
            // Error 
        }
    }
};

修改

现在我将加载相对于可执行文件的文件，而不是使用DataSource的。

Answer 1

我知道这已经过时了，但这对我来说很重要，我和史蒂文一样修复了这个问题，我将发布我用过的C ++代码：

bool ResInterceptor::OnFilterNavigation(int origin_process, int origin_routing_id, const Awesomium::WebString& method, const Awesomium::WebURL& url, bool is_main_frame) 
{
    return false;
}

Awesomium::ResourceResponse* ResInterceptor::OnRequest(Awesomium::ResourceRequest* request)
{
    bool isAsset = std::strcmp(ToString(request->url().scheme()).c_str(), "asset")==0;
    bool isFile = std::strcmp(ToString(request->url().scheme()).c_str(), "file")==0;

    if(!isAsset && !isFile)
    {
        //if it is neither of these we "may" still intercept the call, this allows for offline-online versions to work
        return Awesomium::ResourceInterceptor::OnRequest(request);
    }

    if(isAsset)
    {
        //Blah blah, do whatever
    }
    else if(isFile)
    {
        //Blah blah, same
    }

    //As you can see this isn't very, but it worked for my purposes
    std::string contentpath = "E:/Location/of/files" + ToString(request->url().path()); 

    Awesomium::WebString datatype;
    std::string filename = Awesomium::ToString(request->url().filename());

    //I still want to check for the correct mime type
    if     (has_suffix(filename, ".html")) datatype = Awesomium::WSLit("text/html");
    else if(has_suffix(filename, ".js"))   datatype = Awesomium::WSLit("text/javascript");
    else if(has_suffix(filename, ".css"))  datatype = Awesomium::WSLit("text/css");
    else if(has_suffix(filename, ".swf"))  datatype = Awesomium::WSLit("application/x-shockwave-flash");
    else if(has_suffix(filename, ".zip"))  datatype = Awesomium::WSLit("application/zip");
    else if(has_suffix(filename, ".txt"))  datatype = Awesomium::WSLit("text/plain");
    else if(has_suffix(filename, ".text")) datatype = Awesomium::WSLit("text/plain");
    else if(has_suffix(filename, ".png"))  datatype = Awesomium::WSLit("image/png");
    else if(has_suffix(filename, ".jpeg")) datatype = Awesomium::WSLit("image/jpeg");
    else if(has_suffix(filename, ".jpg"))  datatype = Awesomium::WSLit("image/jpeg");
    else if(has_suffix(filename, ".webm")) datatype = Awesomium::WSLit("video/webm");
    else if(has_suffix(filename, ".mp4"))  datatype = Awesomium::WSLit("video/mp4");
    else if(has_suffix(filename, ".ogv"))  datatype = Awesomium::WSLit("video/ogg");
    else if(has_suffix(filename, ".flv"))  datatype = Awesomium::WSLit("video/flv");

    if(!datatype.IsEmpty())
    {
        FILE * pFile;
        long lSize;
        unsigned char * buffer;
        size_t result;

        pFile = fopen ( contentpath.c_str() , "rb" );
        if (pFile!=NULL)
        {
            // obtain file size:
            fseek (pFile , 0 , SEEK_END);
            lSize = ftell (pFile);
            rewind (pFile);

            // allocate memory to contain the whole file:
            buffer = (unsigned char*) malloc (sizeof(unsigned char)*lSize);
            if (buffer == NULL) {fputs ("Memory error",stderr); exit (2);}

            // copy the file into the buffer:
            result = fread (buffer,1,lSize,pFile);
            if (result != lSize) {fputs ("Reading error",stderr); exit (3);}

            //This is where the magic happens!!
            return Awesomium::ResourceResponse::Create(lSize, buffer, datatype);

            // terminate
            fclose (pFile);
            free (buffer);
        }
        else
        {
            //send this off to the default request handler instead of it being a local file
            return Awesomium::ResourceInterceptor::OnRequest(request);
        }
    }else
    {
        //send this off to the default request handler instead of it being a local file
        return Awesomium::ResourceInterceptor::OnRequest(request);
    }
}

//Support function
bool ResInterceptor::has_suffix(const std::string &str, const std::string &suffix)
{
    return str.size() >= suffix.size() &&
           str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
}

关于我如何连接它，我只是添加了这行代码：

_web_core = WebCore::Initialize(config);
_web_core->set_resource_interceptor(new ResInterceptor());

这花了我整整一夜的时间来确定所有因为我传入了一个带变量的指针并且没有使用＆＃34; new＆＃34;关键字直接！我现在至少得到了它！

另请注意，我在LocalDataSource中尝试了完全相同的代码，除了文本文件之外它没有任何工作，所以我认为那里有一个错误，好消息是，这个工作完全一样方式，但您可以更好地控制每个文件请求。

感谢史蒂文提供的所有优秀参考代码！

Answer 2

简单的方法是发送文件内容而不出汗mime类型检测是使用静态方法static ResourceResponse* Awesomium::ResourceResponse::Create。

来自Awesomium docs：

从磁盘上的文件创建ResourceResponse。

我无法找到将ResourceResponse::Create映射到DataSource::SendResponse的方法。

作为解决方法，您可以将数据源重写为IResourceInterceptor而不是DataSource。我在C how to use http:// scheme instead of the custom asset:// scheme for embedded resources上写了一个详细的例子。将C＃翻译成C ++应该非常简单。以下是我的帖子的编辑版本（未经测试）。

using System;
using System.IO;
using System.Reflection;
using Awesomium.Core;

namespace MyApp
{
    public class ResourceInterceptor : IResourceInterceptor
    {
        /// <summary>
        ///     Intercepts any requests for the EmbeddedResourceDomain base Uri,
        ///     and returns a response using the embedded resource in this app's assembly/DLL file
        /// </summary>
        public virtual ResourceResponse OnRequest(ResourceRequest request)
        {
            ResourceResponse response = null;
            string resourceName;
            string filePath;

            filePath = String.Concat("./", request.Url.AbsolutePath);
            filePath = Path.GetFullPath(resourceName.Replace('/', Path.DirectorySeparatorChar));

            // cache the resource to a temp file if 
            if (File.Exists(filePath))
            {
                response = ResourceResponse.Create(filePath);
            }

            return response;
        }

        /// <summary>
        ///     Optionally blocks any web browser requests by returning true.  Not used.
        /// </summary>
        /// <remarks>
        ///     This method can implement a whitelist of allowed URLs here by
        ///     returning true to block any whitelist misses
        /// </remarks>
        public virtual bool OnFilterNavigation(NavigationRequest request)
        {
            return false;
        }
    }
}

另一种选择可能是破解HTML内容以在文档的<base href="file:///c:/my/bin/path" />内注入<head>元素。您需要在加载内容之前修改href属性值。这可能比它的价值更多。

在Awesomium中加载本地内容

2 个答案: