Windows下Qt Creator中使用cef（移植cefsimple到qt程序例子）

上篇文章，通过CMake+VS2017成功编译了libcef_dll_wrapper.lib静态库，默认使用的是MTd的链接方式，而Qt中常使用的是动态链接（即MDd），所以需要使用MDd的方式重新编译libcef_dll_wrapper.lib。
环境：Windows10 x64 + Qt5.12.3 + VS2017 + cef_binary_3.2704.1414.g185cd6c_windows64

Qt Creator中新建基于Widget的应用程序QtWidgetCef，使用构建组件MSVC2017 64bit。

为了快速实现，我们将cefsimple demo中的源码直接移植到QtWidgetCef中。
首先把cef目录下的include拷贝到新项目中，再将libcef_dll_wrapper.lib（静态库）以及libcef.lib（动态库导入库）拷贝到新项目的lib目录下，然后在pro文件中配置include和lib目录并链接静态库。最后将cefsimple中的simple_app.h、simple_app.cc、simple_handler.h、simple_handler.cc、simple_handler_win.cc拷贝到QtWidgetCef工程源码目录下并在项目中添加。

#-------------------------------------------------
#
# Project created by QtCreator 2020-01-07T14:44:06
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = MyqtCEF
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

CONFIG += c++11

SOURCES += \
        main.cpp \
        simple_app.cc \
        simple_handler.cc \
        simple_handler_win.cc \
        widget.cpp

HEADERS += \
        simple_app.h \
        simple_handler.h \
        widget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

win32: LIBS += -L$$PWD/lib/ -llibcef_dll_wrapper
win32: LIBS += -L&&PWD/lib/ -llibcef

INCLUDEPATH += $$PWD/include
DEPENDPATH += $$PWD/include

win32:!win32-g++: PRE_TARGETDEPS += $$PWD/lib/libcef_dll_wrapper.lib
else:win32-g++: PRE_TARGETDEPS += $$PWD/lib/liblibcef_dll_wrapper.a

LIBS += $$PWD/lib/libcef_dll_wrapper.lib \
shell32.lib \
kernel32.lib \
user32.lib \
ole32.lib \
oleaut32.lib \
gdi32.lib

将代码中的#include "cefsimple/simple_handler.h"替换为#include "simple_handler.h"，因为路径改变了~ 打开main.cpp，将主函数改为如下代码：

 1 int main(int argc, char* argv[]) {
 2     // Enable High DPI support.
 3     CefEnableHighDPISupport();
 4 
 5     // Structure for passing command-line arguments.
 6     // The definition of this structure is platform-specific.
 7     CefMainArgs main_args(GetModuleHandle(nullptr));
 8 
 9     // Optional implementation of the CefApp interface.
10     CefRefPtr<CefApp> app(new SimpleApp);
11 
12     // Execute the sub-process logic, if any. This will either return immediately for the browser
13     // process or block until the sub-process should exit.
14     int exit_code = CefExecuteProcess(main_args, app.get(), nullptr);
15     if (exit_code >= 0) {
16         // The sub-process terminated, exit now.
17         return exit_code;
18     }
19 
20     // Populate this structure to customize CEF behavior.
21     CefSettings settings;
22     settings.no_sandbox = true;
23 
24     // Multi-thread message loop?
25     settings.multi_threaded_message_loop = false;
26 
27     // Initialize CEF in the main process.
28     CefInitialize(main_args, settings, app.get(), nullptr);
29 
30     // Run the CEF message loop. This will block until CefQuitMessageLoop() is called.
31     CefRunMessageLoop();
32 
33     // Shut down CEF.
34     CefShutdown();
35 
36     return 0;
37 }