一、前言
经过上几篇的学习,现在我们已经掌握了ActiveX的整个开发过程,但要发挥ActiveX的真正威力,必须依靠JS。下面一起来学习吧!
二、JS调用ActiveX方法
只需在UserControl子类中(即自定义的ActiveX控件中),编写公共方法即可。
C#
[Guid("0203DABD-51B8-4E8E-A1EB-156950EE1668")]
public partial class Uploader : UserControl, IObjectSafety
{
public Uploader(){
InitializeComponent();
}
// 被JS调用的ActiveX方法
public void SayHi(msg){
MessageBox.show(msg);
}
}
html// 注意:object必须要写成<object></object>才能通过document.getElementById来获取
<object classid="clsid:xxxxxxxxxx" id="ax"></object>
<script type="text/javascript">
document.getElementById('ax').SayHi('Test');// 调用ActiveX方法
</script>
三、ActiveX调用JS方法
1. 引入`Microsoft.mshtml`程序集,该程序集位于`C:\Program Files\Microsoft.NET\Primary Interop Assemblies\Microsoft.mshtml.dll`
2. 实现COM类`IOleClientSite`
C#
[ComImport,
Guid("00000118-0000-0000-C000-000000000046"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleClientSite
{
void SaveObject();
void GetMoniker(uint dwAssign, uint dwWhichMoniker, object ppmk);
void GetContainer(out IOleContainer ppContainer);
void ShowObject();
void OnShowWindow(bool fShow);
void RequestNewObjectLayout();
}
3. 实现COM类`IOleContainer`
C#
[ComImport,
Guid("0000011B-0000-0000-C000-000000000046"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleContainer
{
void EnumObjects([In, MarshalAs(UnmanagedType.U4)] int grfFlags,
[Out, MarshalAs(UnmanagedType.LPArray)] object[] ppenum);
void ParseDisplayName([In, MarshalAs(UnmanagedType.Interface)] object pbc,
[In, MarshalAs(UnmanagedType.BStr)] string pszDisplayName,
[Out, MarshalAs(UnmanagedType.LPArray)] int[] pchEaten,
[Out, MarshalAs(UnmanagedType.LPArray)] object[] ppmkOut);
void LockContainer([In, MarshalAs(UnmanagedType.I4)] int fLock);
}
4. 在用户控件中调用JS方法
在MyUserControl.cs中
C#
#region 调用js函数
private Type typeIOleObject = null;
private IOleClientSite oleClientSite = null;
private IOleContainer pObj = null;
/// <summary>
/// 调用JS函数
/// </summary>
/// <param name="fnName">js函数名</param>
/// <param name="args">入参</param>
protected void CallJS(string fnName, params object[] args)
{
if (typeIOleObject == null)
{
typeIOleObject = this.GetType().GetInterface("IOleObject", true);
object tmpOldClientSite = typeIOleObject.InvokeMember("GetClientSite",
BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public,
null,
this,
null);
oleClientSite = tmpOldClientSite as IOleClientSite;
oleClientSite.GetContainer(out pObj);
}
//获取页面的Script集合
IHTMLDocument pDoc2 = (IHTMLDocument)pObj;
object script = pDoc2.Script;
try
{
//调用JavaScript方法OnScaned并传递参数,因为此方法可能并没有在页面中实现,所以要进行异常处理
script.GetType().InvokeMember(fnName,
BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public,
null,
script,
args);
}
catch { }
}
#endregion
五、踩过的坑
1. 若在IE9下无法加载ActiveX控件
检查是否为64位的IE9。32位的ActiveX控件不能在64位的IE上使用。(通过“任务管理器”查看进程名称,若为浏览器进程名称后跟32就是32位的)