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魏海娜,爱意文学,位面征战传奇
需求场景：在查询页面，填写查询条件，查询条件包括上传的图片，根据图片的特征查询，这就需要在提交的时候，使用post提交，因为get提交无法提交图片数据，提交查询条件之后，在新的窗口展示查询结果。(当然查询结果页面可能不支持f5刷新页面)
表单html代码示意(注意method="post" target="_blank" action指向新页面)：
<!doctype html>
<html>
<head>
<title>提交表单查询</title>
<script type="text/javascript" src='jquery.js'></script>
<script type="text/javascript">
//保存
function save() {
$("#frm").submit();
}
</script>
</head>
<body>
<form id="frm" action="searchresult" enctype="multipart/form-data" method="post" target="_blank">
<input type="text" class="input-text" id="title" name="title" value="测试title" style="width: 300px;" />
<input type="text" class="input-text" id="name" name="name" value="测试name" style="width: 300px;" />
<a href="javascript:void(0);" onclick="save()">保存</a>
</form>
</body>
</html>
请先大致看下winform版的cefsharp浏览器控件实现方式：
下面是wpf版的cefsharp浏览器控件的实现方式，与winform版相同的代码这里不再粘贴：
using cefsharp;
using log4net;
using suncreate.vipf.base;
using suncreate.vipf.client.bussiness;
using system;
using system.collections.generic;
using system.componentmodel;
using system.linq;
using system.runtime.interopservices;
using system.text;
using system.threading;
using system.threading.tasks;
using system.windows;
using system.windows.controls;
using system.windows.data;
using system.windows.documents;
using system.windows.input;
using system.windows.interop;
using system.windows.media;
using system.windows.media.imaging;
using system.windows.navigation;
using system.windows.shapes;
namespace suncreate.vipf.client.ui
{
/// <summary>
/// 浏览器用户控件
/// </summary>
public partial class browserctrl : usercontrol, idisposable
{
[dllimport("user32.dll", setlasterror = true)]
private static extern intptr setparent(intptr hwndchild, intptr hwndnewparent);
[dllimport("user32.dll", setlasterror = true)]
public static extern intptr findwindowex(intptr parenthandle, intptr childafter, string classname, string windowtitle);
[dllimport("user32.dll", setlasterror = true)]
public static extern int movewindow(intptr hwnd, int x, int y, int nwidth, int nheight, bool brepaint);
[dllimport("user32.dll", setlasterror = true)]
public static extern int closewindow(intptr hwnd);
[dllimport("user32.dll", entrypoint = "getwindowtext")]
private static extern int getwindowtext(intptr hwnd, stringbuilder lpstring, int nmaxcount);
private ilog _log = logmanager.getlogger(typeof(browserctrl));
private static bool _iscefinited = false;
private static object _lockobject = new object();
private jsobject _jsobject;
private bool _firstload = true;
/// <summary>
/// 在此事件中设置url(此事件已在线程中执行，此事件已对错误情况进行处理)
/// </summary>
public event eventhandler seturlevent;
/// <summary>
/// url
/// </summary>
public string url { get; set; }
/// <summary>
/// 浏览器frameloadend事件
/// </summary>
public event eventhandler frameloadend;
private extchromiumbrowser _browser;
public extchromiumbrowser browser
{
get
{
return this._browser;
}
}
public browserctrl()
{
initializecomponent();
if (designerproperties.getisindesignmode(this)) return;
this.loaded += browserctrl_loaded;
lock (_lockobject)
{
if (!_iscefinited)
{
_iscefinited = true;
initcef(true);//初始化cefsharp
}
}
_browser = new extchromiumbrowser();
bindbrowser(_browser);
grid.children.add(_browser);
}
/// <summary>
/// 设置map控件接口，用于c#和js互操作
/// </summary>
public void setmapctrl(imapctrl mapctrl)
{
_jsobject.mapctrl = mapctrl;
}
/// <summary>
/// 释放资源
/// </summary>
public void dispose()
{
//如果有弹出窗口则先释放它
foreach (uielement item in grid.children)
{
if (item is browsercontainer)
{
(item as browsercontainer).clearresource();
}
}
if (_browser != null && !_browser.isdisposed)
{
_browser.dispose();
}
}
private void browserctrl_loaded(object sender, routedeventargs e)
{
}
private void loadurl()
{
if (_firstload)
{
_firstload = false;
system.threading.tasks.task.factory.startnew(() =>
{
thread.sleep(100);
if (url == null && seturlevent != null)
{
try
{
seturlevent(this, null);
}
catch (exception ex)
{
_log.error("browserctrl loadurl error 获取url失败", ex);
}
}
this.dispatcher.invoke(new action(() =>
{
_browser.load(url);
}));
});
}
}
private void bindbrowser(extchromiumbrowser browser)
{
_jsobject = new jsobject();
browser.registerjsobject("jsobj", _jsobject, false);
browser.startnewwindow += (s, e) =>
{
try
{
intptr hwndchild = intptr.zero; //浏览器弹出窗口句柄
browsercontainer browsercontainer = new browsercontainer();
system.windows.forms.control control = new system.windows.forms.control();
control.dock = system.windows.forms.dockstyle.fill;
control.createcontrol();
browsercontainer.host.child = control;
browsercontainer.clearresourceevent += (ss, ee) =>
{
closewindow(hwndchild);
control.dispose();
browsercontainer.host.dispose();
};
//释放上一个弹出窗口
foreach (uielement item in grid.children)
{
if (item is browsercontainer)
{
(item as browsercontainer).clearresource();
}
}
grid.children.clear();
grid.children.add(browsercontainer);
e.windowinfo.setaschild(control.handle, 0, 0, (int)browsercontainer.actualwidth, (int)browsercontainer.actualheight);
browsercontainer.sizechanged += (ss, ee) =>
{
hwndchild = findwindowex(control.handle, intptr.zero, null, null);
movewindow(hwndchild, 0, 0, (int)browsercontainer.actualwidth, (int)browsercontainer.actualheight, true);
};
}
catch (exception ex)
{
_log.error("browserctrl bindbrowser error", ex);
}
};
browser.isbrowserinitializedchanged += (ss, ee) =>
{
loadurl();
};
browser.frameloadstart += (ss, ee) =>
{
this.dispatcher.begininvoke(new action(() =>
{
(ss as extchromiumbrowser).focus();
}));
};
browser.frameloadend += (ss, ee) =>
{
this.dispatcher.begininvoke(new action(() =>
{
loadingwait.visibility = visibility.collapsed;
}));
if (frameloadend != null)
{
frameloadend(null, null);
}
};
browser.keydown += (ss, ee) =>
{
if (ee.key == key.d)
{
//_browser.executescriptasync("dayornightmap", 0);
}
if (ee.key == key.n)
{
//_browser.executescriptasync("dayornightmap", 1);
}
};
browser.loaderror += (ss, ee) =>
{
_log.error("extchromiumbrowser loaderror 错误码：" + ee.errorcode + "，错误信息：" + ee.errortext + "，错误url：" + ee.failedurl);
return; //下面代码不执行
system.threading.tasks.task.factory.startnew(() =>
{
if (url == null && seturlevent != null)
{
try
{
seturlevent(this, null);
}
catch (exception ex)
{
_log.error("browserctrl loadurl error 获取url失败", ex);
}
}
thread.sleep(500);
this.dispatcher.begininvoke(new action(() =>
{
(ss as extchromiumbrowser).load(url);
}));
});
};
}
#region 初始化cefsharp
public static void initcef(bool multithreadedmessageloop)
{
string cefsharpfolder = "cefsharp.v49.0.1";
var settings = new cefsettings();
//the location where cache data will be stored on disk. if empty an in-memory cache will be used for some features and a temporary disk cache for others.
//html5 databases such as localstorage will only persist across sessions if a cache path is specified.
// settings.cachepath = cefsharpfolder + "/cache"; //注释掉，不使用cache
settings.multithreadedmessageloop = multithreadedmessageloop;
settings.focusednodechangedenabled = true;
cef.oncontextinitialized = delegate
{
var cookiemanager = cef.getglobalcookiemanager();
cookiemanager.setstoragepath(cefsharpfolder + "/cookies", true);
cookiemanager.setsupportedschemes("custom");
};
settings.browsersubprocesspath = appdomain.currentdomain.basedirectory + cefsharpfolder + "/cefsharp.browsersubprocess.exe";
settings.logfile = cefsharpfolder + "/debug.log";
settings.cefcommandlineargs.add("disable-gpu", "1");
settings.cefcommandlineargs.add("enable-media-stream", "1");
if (!cef.initialize(settings, shutdownonprocessexit: true, performdependencycheck: true))
{
throw new exception("unable to initialize cef");
}
}
#endregion
}
}
核心代码(startnewwindow)：
browser.startnewwindow += (s, e) =>
{
try
{
intptr hwndchild = intptr.zero; //浏览器弹出窗口句柄
browsercontainer browsercontainer = new browsercontainer();
system.windows.forms.control control = new system.windows.forms.control();
control.dock = system.windows.forms.dockstyle.fill;
control.createcontrol();
browsercontainer.host.child = control;
browsercontainer.clearresourceevent += (ss, ee) =>
{
closewindow(hwndchild);
control.dispose();
browsercontainer.host.dispose();
};
//释放上一个弹出窗口
foreach (uielement item in grid.children)
{
if (item is browsercontainer)
{
(item as browsercontainer).clearresource();
}
}
grid.children.clear();
grid.children.add(browsercontainer);
e.windowinfo.setaschild(control.handle, 0, 0, (int)browsercontainer.actualwidth, (int)browsercontainer.actualheight);
browsercontainer.sizechanged += (ss, ee) =>
{
hwndchild = findwindowex(control.handle, intptr.zero, null, null);
movewindow(hwndchild, 0, 0, (int)browsercontainer.actualwidth, (int)browsercontainer.actualheight, true);
};
}
catch (exception ex)
{
_log.error("browserctrl bindbrowser error", ex);
}
};
核心代码(资源释放)：
/// <summary>
/// 释放资源
/// </summary>
public void dispose()
{
//如果有弹出窗口则先释放它
foreach (uielement item in grid.children)
{
if (item is browsercontainer)
{
(item as browsercontainer).clearresource();
}
}
if (_browser != null && !_browser.isdisposed)
{
_browser.dispose();
}
}
难点：弹出窗口和原来的窗口似乎共用同一个chromiumwebbrowser实例的某些东西，但是弹出的窗口本身又获取不到chromiumwebbrowser实例，某些操作不便。
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