函数（cef_request_handler.h）：
virtual ReturnValue OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback) {
return RV_CONTINUE;
}
将函数复制到SimpleHandler类，如下所示。
virtual ReturnValue OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback) OVERRIDE;
将以下内容添加到SimpleHandler类文件中：
#include "include/cef_request_handler.h"
我没有从Simplehandler类扩展CefRequestHandler类。我不认为这是必要的。
在我的Simplehandler.cc文件中，我实现了如下所示的函数：
CefRequestHandler::ReturnValue SimpleHandler::OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback){
CefRequest::ReferrerPolicy origin = REFERRER_POLICY_ALWAYS;
request->SetReferrer("www.google.com",origin);
return RV_CONTINUE;
}
我收到以下错误：
error: no ‘CefRequestHandler::ReturnValue SimpleHandler::OnBeforeResourceLoad(CefRefPtr<CefBrowser>, CefRefPtr<CefFrame>, CefRefPtr<CefRequest>, CefRefPtr<CefRequestCallback>)’ member function declared in class ‘SimpleHandler’
CefRefPtr<CefRequestCallback> callback){
^
CefRequestHandler::ReturnValue派生自CefRequestHandler类中的以下语句：
typedef cef_return_value_t ReturnValue;
我错过了什么会导致编译器说出no member function declared in class ‘SimpleHandler’？
simple_handler.h / SimpleHandler类
// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
#ifndef CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_
#define CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_
#include "include/cef_client.h"
#include "include/cef_request_handler.h"
#include <list>
class SimpleHandler : public CefClient,
public CefDisplayHandler,
public CefLifeSpanHandler,
public CefLoadHandler {
public:
explicit SimpleHandler(bool use_views);
~SimpleHandler();
// Provide access to the single global instance of this object.
static SimpleHandler* GetInstance();
// CefClient methods:
virtual CefRefPtr<CefDisplayHandler> GetDisplayHandler() OVERRIDE {
return this;
}
virtual CefRefPtr<CefLifeSpanHandler> GetLifeSpanHandler() OVERRIDE {
return this;
}
virtual CefRefPtr<CefLoadHandler> GetLoadHandler() OVERRIDE {
return this;
}
// CefDisplayHandler methods:
virtual void OnTitleChange(CefRefPtr<CefBrowser> browser,
const CefString& title) OVERRIDE;
// CefLifeSpanHandler methods:
virtual void OnAfterCreated(CefRefPtr<CefBrowser> browser) OVERRIDE;
virtual bool DoClose(CefRefPtr<CefBrowser> browser) OVERRIDE;
virtual void OnBeforeClose(CefRefPtr<CefBrowser> browser) OVERRIDE;
// CefLoadHandler methods:
virtual void OnLoadError(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
ErrorCode errorCode,
const CefString& errorText,
const CefString& failedUrl) OVERRIDE;
virtual ReturnValue OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback) OVERRIDE;
//{ return false; }
// Request that all existing browser windows close.
void CloseAllBrowsers(bool force_close);
bool IsClosing() const { return is_closing_; }
private:
// Platform-specific implementation.
void PlatformTitleChange(CefRefPtr<CefBrowser> browser,
const CefString& title);
// True if the application is using the Views framework.
const bool use_views_;
// List of existing browser windows. Only accessed on the CEF UI thread.
typedef std::list<CefRefPtr<CefBrowser> > BrowserList;
BrowserList browser_list_;
bool is_closing_;
// Include the default reference counting implementation.
IMPLEMENT_REFCOUNTING(SimpleHandler);
};
#endif // CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_
simple_handler.cc
// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
#include "cefsimple/simple_handler.h"
#include <sstream>
#include <string>
#include "include/base/cef_bind.h"
#include "include/cef_app.h"
#include "include/views/cef_browser_view.h"
#include "include/views/cef_window.h"
#include "include/wrapper/cef_closure_task.h"
#include "include/wrapper/cef_helpers.h"
#include "include/cef_request_handler.h"
namespace {
SimpleHandler* g_instance = NULL;
} // namespace
SimpleHandler::SimpleHandler(bool use_views)
: use_views_(use_views),
is_closing_(false) {
DCHECK(!g_instance);
g_instance = this;
}
SimpleHandler::~SimpleHandler() {
g_instance = NULL;
}
// static
SimpleHandler* SimpleHandler::GetInstance() {
return g_instance;
}
void SimpleHandler::OnTitleChange(CefRefPtr<CefBrowser> browser,
const CefString& title) {
CEF_REQUIRE_UI_THREAD();
if (use_views_) {
// Set the title of the window using the Views framework.
CefRefPtr<CefBrowserView> browser_view =
CefBrowserView::GetForBrowser(browser);
if (browser_view) {
CefRefPtr<CefWindow> window = browser_view->GetWindow();
if (window)
window->SetTitle(title);
}
} else {
// Set the title of the window using platform APIs.
PlatformTitleChange(browser, title);
}
}
void SimpleHandler::OnAfterCreated(CefRefPtr<CefBrowser> browser) {
CEF_REQUIRE_UI_THREAD();
// Add to the list of existing browsers.
browser_list_.push_back(browser);
}
CefRequestHandler::ReturnValue SimpleHandler::OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback){
CefRequest::ReferrerPolicy origin = REFERRER_POLICY_ALWAYS;
request->SetReferrer("www.google.com",origin);
return RV_CONTINUE;
}
bool SimpleHandler::DoClose(CefRefPtr<CefBrowser> browser) {
CEF_REQUIRE_UI_THREAD();
// Closing the main window requires special handling. See the DoClose()
// documentation in the CEF header for a detailed destription of this
// process.
if (browser_list_.size() == 1) {
// Set a flag to indicate that the window close should be allowed.
is_closing_ = true;
}
// Allow the close. For windowed browsers this will result in the OS close
// event being sent.
return false;
}
void SimpleHandler::OnBeforeClose(CefRefPtr<CefBrowser> browser) {
CEF_REQUIRE_UI_THREAD();
// Remove from the list of existing browsers.
BrowserList::iterator bit = browser_list_.begin();
for (; bit != browser_list_.end(); ++bit) {
if ((*bit)->IsSame(browser)) {
browser_list_.erase(bit);
break;
}
}
if (browser_list_.empty()) {
// All browser windows have closed. Quit the application message loop.
CefQuitMessageLoop();
}
}
void SimpleHandler::OnLoadError(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
ErrorCode errorCode,
const CefString& errorText,
const CefString& failedUrl) {
CEF_REQUIRE_UI_THREAD();
// Don't display an error for downloaded files.
if (errorCode == ERR_ABORTED)
return;
// Display a load error message.
std::stringstream ss;
ss << "<html><body bgcolor=\"white\">"
"<h2>Failed to load URL " << std::string(failedUrl) <<
" with error " << std::string(errorText) << " (" << errorCode <<
").</h2></body></html>";
frame->LoadString(ss.str(), failedUrl);
}
void SimpleHandler::CloseAllBrowsers(bool force_close) {
if (!CefCurrentlyOn(TID_UI)) {
// Execute on the UI thread.
CefPostTask(TID_UI,
base::Bind(&SimpleHandler::CloseAllBrowsers, this, force_close));
return;
}
if (browser_list_.empty())
return;
BrowserList::const_iterator it = browser_list_.begin();
for (; it != browser_list_.end(); ++it)
(*it)->GetHost()->CloseBrowser(force_close);
}
cef_request_handler.h Cefrequesthandler类
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// tools directory for more information.
//
#ifndef CEF_INCLUDE_CEF_REQUEST_HANDLER_H_
#define CEF_INCLUDE_CEF_REQUEST_HANDLER_H_
#pragma once
#include "include/cef_auth_callback.h"
#include "include/cef_base.h"
#include "include/cef_browser.h"
#include "include/cef_frame.h"
#include "include/cef_resource_handler.h"
#include "include/cef_response.h"
#include "include/cef_response_filter.h"
#include "include/cef_request.h"
#include "include/cef_ssl_info.h"
///
// Callback interface used for asynchronous continuation of url requests.
///
/*--cef(source=library)--*/
class CefRequestCallback : public virtual CefBase {
public:
///
// Continue the url request. If |allow| is true the request will be continued.
// Otherwise, the request will be canceled.
///
/*--cef(capi_name=cont)--*/
virtual void Continue(bool allow) =0;
///
// Cancel the url request.
///
/*--cef()--*/
virtual void Cancel() =0;
};
///
// Implement this interface to handle events related to browser requests. The
// methods of this class will be called on the thread indicated.
///
/*--cef(source=client)--*/
class CefRequestHandler : public virtual CefBase {
public:
typedef cef_return_value_t ReturnValue;
typedef cef_termination_status_t TerminationStatus;
typedef cef_urlrequest_status_t URLRequestStatus;
typedef cef_window_open_disposition_t WindowOpenDisposition;
///
// Called on the UI thread before browser navigation. Return true to cancel
// the navigation or false to allow the navigation to proceed. The |request|
// object cannot be modified in this callback.
// CefLoadHandler::OnLoadingStateChange will be called twice in all cases.
// If the navigation is allowed CefLoadHandler::OnLoadStart and
// CefLoadHandler::OnLoadEnd will be called. If the navigation is canceled
// CefLoadHandler::OnLoadError will be called with an |errorCode| value of
// ERR_ABORTED.
///
/*--cef()--*/
virtual bool OnBeforeBrowse(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
bool is_redirect) {
return false;
}
///
// Called on the UI thread before OnBeforeBrowse in certain limited cases
// where navigating a new or different browser might be desirable. This
// includes user-initiated navigation that might open in a special way (e.g.
// links clicked via middle-click or ctrl + left-click) and certain types of
// cross-origin navigation initiated from the renderer process (e.g.
// navigating the top-level frame to/from a file URL). The |browser| and
// |frame| values represent the source of the navigation. The
// |target_disposition| value indicates where the user intended to navigate
// the browser based on standard Chromium behaviors (e.g. current tab,
// new tab, etc). The |user_gesture| value will be true if the browser
// navigated via explicit user gesture (e.g. clicking a link) or false if it
// navigated automatically (e.g. via the DomContentLoaded event). Return true
// to cancel the navigation or false to allow the navigation to proceed in the
// source browser's top-level frame.
///
/*--cef()--*/
virtual bool OnOpenURLFromTab(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
const CefString& target_url,
WindowOpenDisposition target_disposition,
bool user_gesture) {
return false;
}
///
// Called on the IO thread before a resource request is loaded. The |request|
// object may be modified. Return RV_CONTINUE to continue the request
// immediately. Return RV_CONTINUE_ASYNC and call CefRequestCallback::
// Continue() at a later time to continue or cancel the request
// asynchronously. Return RV_CANCEL to cancel the request immediately.
//
///
/*--cef(default_retval=RV_CONTINUE)--*/
virtual ReturnValue OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback) {
//CefRequest::ReferrerPolicy origin = REFERRER_POLICY_ALWAYS;
// request->SetReferrer("www.google.com",origin);
return RV_CONTINUE;
}
///
// Called on the IO thread before a resource is loaded. To allow the resource
// to load normally return NULL. To specify a handler for the resource return
// a CefResourceHandler object. The |request| object should not be modified in
// this callback.
///
/*--cef()--*/
virtual CefRefPtr<CefResourceHandler> GetResourceHandler(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request) {
return NULL;
return new MyResourceHandler();
//new MyResourceHandler();
}
class MyResourceHandler : public CefResourceHandler
{
public:
MyResourceHandler()
//offset_(0)
{}
bool ProcessRequest(CefRefPtr<CefRequest> request,
CefRefPtr<CefCallback> callback) {
CefRefPtr<CefRequest> cef = CefRequest::Create();
request = cef;
CefRequest::ReferrerPolicy origin = REFERRER_POLICY_ALWAYS;
request->SetReferrer("www.google.com",origin);
return true;
//cef->SetReferrer("www.google.com",origin);};
};
void GetResponseHeaders(CefRefPtr<CefResponse> response,
int64& response_length,
CefString& redirectUrl) ;
bool ReadResponse(void* data_out,
int bytes_to_read,
int& bytes_read,
CefRefPtr<CefCallback> callback) ;
bool CanGetCookie(const CefCookie& cookie) { return true; }
bool CanSetCookie(const CefCookie& cookie) { return true; }
void Cancel() ;
void AddRef()const {} ;
bool Release() const { return true; }
bool HasOneRef() const { return true; };
//bool CefBase::HasOneRef();
//void CefBase::AddRef() const;
// bool ProcessRequest (CefRefPtr<CefRequest> request,
//CefRefPtr<CefCallback> callback){
//CefRefPtr<CefRequest> cef = CefRequest::Create();
//cef = request;
//CefRequest::ReferrerPolicy origin = REFERRER_POLICY_ALWAYS;
//request->SetReferrer("www.google.com",origin);
//cef->SetReferrer("www.google.com",origin);
//}
//IMPLEMENT_REFCOUNTING(MyResourceHandler);
//IMPLEMENT_LOCKING(MyResourceHandler);
};
//void AddRef();
///
// Called on the IO thread when a resource load is redirected. The |request|
// parameter will contain the old URL and other request-related information.
// The |new_url| parameter will contain the new URL and can be changed if
// desired. The |request| object cannot be modified in this callback.
///
/*--cef()--*/
virtual void OnResourceRedirect(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefString& new_url) {}
///
// Called on the IO thread when a resource response is received. To allow the
// resource to load normally return false. To redirect or retry the resource
// modify |request| (url, headers or post body) and return true. The
// |response| object cannot be modified in this callback.
///
/*--cef()--*/
virtual bool OnResourceResponse(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefResponse> response) {
return false;
}
///
// Called on the IO thread to optionally filter resource response content.
// |request| and |response| represent the request and response respectively
// and cannot be modified in this callback.
///
/*--cef()--*/
virtual CefRefPtr<CefResponseFilter> GetResourceResponseFilter(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefResponse> response) {
return NULL;
}
///
// Called on the IO thread when a resource load has completed. |request| and
// |response| represent the request and response respectively and cannot be
// modified in this callback. |status| indicates the load completion status.
// |received_content_length| is the number of response bytes actually read.
///
/*--cef()--*/
virtual void OnResourceLoadComplete(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefResponse> response,
URLRequestStatus status,
int64 received_content_length) {}
///
// Called on the IO thread when the browser needs credentials from the user.
// |isProxy| indicates whether the host is a proxy server. |host| contains the
// hostname and |port| contains the port number. |realm| is the realm of the
// challenge and may be empty. |scheme| is the authentication scheme used,
// such as "basic" or "digest", and will be empty if the source of the request
// is an FTP server. Return true to continue the request and call
// CefAuthCallback::Continue() either in this method or at a later time when
// the authentication information is available. Return false to cancel the
// request immediately.
///
/*--cef(optional_param=realm,optional_param=scheme)--*/
virtual bool GetAuthCredentials(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
bool isProxy,
const CefString& host,
int port,
const CefString& realm,
const CefString& scheme,
CefRefPtr<CefAuthCallback> callback) {
return false;
}
///
// Called on the IO thread when JavaScript requests a specific storage quota
// size via the webkitStorageInfo.requestQuota function. |origin_url| is the
// origin of the page making the request. |new_size| is the requested quota
// size in bytes. Return true to continue the request and call
// CefRequestCallback::Continue() either in this method or at a later time to
// grant or deny the request. Return false to cancel the request immediately.
///
/*--cef()--*/
virtual bool OnQuotaRequest(CefRefPtr<CefBrowser> browser,
const CefString& origin_url,
int64 new_size,
CefRefPtr<CefRequestCallback> callback) {
return false;
}
///
// Called on the UI thread to handle requests for URLs with an unknown
// protocol component. Set |allow_os_execution| to true to attempt execution
// via the registered OS protocol handler, if any.
// SECURITY WARNING: YOU SHOULD USE THIS METHOD TO ENFORCE RESTRICTIONS BASED
// ON SCHEME, HOST OR OTHER URL ANALYSIS BEFORE ALLOWING OS EXECUTION.
///
/*--cef()--*/
virtual void OnProtocolExecution(CefRefPtr<CefBrowser> browser,
const CefString& url,
bool& allow_os_execution) {}
///
// Called on the UI thread to handle requests for URLs with an invalid
// SSL certificate. Return true and call CefRequestCallback::Continue() either
// in this method or at a later time to continue or cancel the request. Return
// false to cancel the request immediately. If
// CefSettings.ignore_certificate_errors is set all invalid certificates will
// be accepted without calling this method.
///
/*--cef()--*/
virtual bool OnCertificateError(
CefRefPtr<CefBrowser> browser,
cef_errorcode_t cert_error,
const CefString& request_url,
CefRefPtr<CefSSLInfo> ssl_info,
CefRefPtr<CefRequestCallback> callback) {
return false;
}
///
// Called on the browser process UI thread when a plugin has crashed.
// |plugin_path| is the path of the plugin that crashed.
///
/*--cef()--*/
virtual void OnPluginCrashed(CefRefPtr<CefBrowser> browser,
const CefString& plugin_path) {}
///
// Called on the browser process UI thread when the render view associated
// with |browser| is ready to receive/handle IPC messages in the render
// process.
///
/*--cef()--*/
virtual void OnRenderViewReady(CefRefPtr<CefBrowser> browser) {}
///
// Called on the browser process UI thread when the render process
// terminates unexpectedly. |status| indicates how the process
// terminated.
///
/*--cef()--*/
virtual void OnRenderProcessTerminated(CefRefPtr<CefBrowser> browser,
TerminationStatus status) {}
};
#endif // CEF_INCLUDE_CEF_REQUEST_HANDLER_H_
答案 0 :(得分：1)
SimpleHandler不是从CefRequestHandler派生的。然而，在SimpleHandler中使用ReturnValue而没有CefRequestHandler限定符，其中函数实现中ReturnValue与CrefRequestHandler限定符一起使用。 - CrefRequestHandler :: ReturnValue SimpleHandler :: OnBeforeResourceLoad。
这意味着SimpleHandler的一个基类也声明了ReturnValue（并且与CrefRequestHandler声明不同），因此在定义中它使用基类值，并且在它使用CefRequestHandler的实现中导致不匹配。
将定义更改为以下。
virtual CefRequestHandler::ReturnValue OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefRequestCallback> callback) OVERRIDE;