webkit初探

今天用vs单步跟了一下webkit的运行流程，基本是这样的

1.WinLauncher 里面的 _WINMAIN_ 做一些程序的加载然后进入

2.通过函数 entryPoint(hInstance, hPrevInstance, lpstrCmdLine, nCmdShow);

#if USE_CONSOLE_ENTRY_POINT
    typedef int (WINAPI*EntryPoint)(int, const char*[]);
    const char* entryPointName = "_dllLauncherEntryPoint@8";
#else
    typedef int (WINAPI*EntryPoint)(HINSTANCE, HINSTANCE, LPWSTR, int);
    const char* entryPointName = "_dllLauncherEntryPoint@16";
#endif

//应该是利用工厂方法获得正确的处理函数

EntryPoint entryPoint = reinterpret_cast<EntryPoint>(::GetProcAddress(module, entryPointName));// 看起来像一个仿函数，先不管，继续往后看

3.进入extern "C" __declspec(dllexport) int WINAPI dllLauncherEntryPoint(HINSTANCE, HINSTANCE, LPTSTR, int nCmdShow)

做一些初始化工作，包括创建win窗口，建立frame对象等等

。。。。。

IWebFrame* frame;
    hr = gWebView->mainFrame(&frame);
    if (FAILED(hr))
        goto exit;

    static BSTR defaultHTML = SysAllocString(TEXT("<p style=\"background-color: #00FF00\">Testing</p><img id=\"webkit logo\" src=\"http://webkit.org/images/icon-gold.png\" alt=\"Face\"><div style=\"border: solid blue; background: white;\" contenteditable=\"true\">div with blue border</div><ul><li>foo<li>bar<li>baz</ul>"));
    frame->loadHTMLString(defaultHTML, 0);

4.进入WebFrame::loadHTMLString 开始对网页进行读取

RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::create(reinterpret_cast<char*>(string), sizeof(UChar) * SysStringLen(string));
BString utf16Encoding(TEXT("utf-16"), 6);
loadData(sharedBuffer.release(), 0, utf16Encoding, baseURL, unreachableURL);

//前两行是获取对webkit内部字符编码的格式，第三行进入loaddata开始对url请求进行处理

5.WebFrame::loadData(PassRefPtr<WebCore::SharedBuffer> data, BSTR mimeType, BSTR textEncodingName, BSTR baseURL, BSTR failingURL)

    String mimeTypeString(mimeType, SysStringLen(mimeType));
    if (!mimeType)
        mimeTypeString = "text/html";

    String encodingString(textEncodingName, SysStringLen(textEncodingName)); // 获取内部处理字符编码的格式

    // FIXME: We should really be using MarshallingHelpers::BSTRToKURL here,
    // but that would turn a null BSTR into a null KURL, and we crash inside of
    // WebCore if we use a null KURL in constructing the ResourceRequest.
    KURL baseKURL = KURL(KURL(), String(baseURL ? baseURL : L"", SysStringLen(baseURL))); //对url进行预处理，包括解析host，path。fragement等等

    KURL failingKURL = MarshallingHelpers::BSTRToKURL(failingURL);

    ResourceRequest request(baseKURL);
    SubstituteData substituteData(data, mimeTypeString, encodingString, failingKURL);

    // This method is only called from IWebFrame methods, so don't ASSERT that the Frame pointer isn't null.
    if (Frame* coreFrame = core(this))
        coreFrame->loader()->load(request, substituteData, false);

饿在上班呢今天看到这里，未完待续！