Shulou(Shulou.com)06/02 Report--

People use C#to develop ActiveX controls and use web calls. I believe many inexperienced people are helpless about this. For this reason, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Almost two months into the job, students slowly to the workplace to do the transformation, but also slowly accumulate knowledge, constantly update themselves. A recent project inside, involving some problems, because the SDK provides only winform can be used, but there are requirements we have to complete ah, so involved in ActiveX control development and web to display, just to sum up some, before the school has not been contacted, there are tutorials on the Internet, but most of the problems, only their own test passed only rest assured.

I. Developing ActiveX Controls

1. Create a new class library and name it "user.cs";

2. Add a custom user control "UserControl1" to the class library to realize various custom functions;

3. In order to solve the influence of browser security settings on controls, IObjectSafety interface must be added to the component, so an interface class "IObjectSafety.cs" is added.

using System; using System.Collections.Generic; using System.Text; using System.Web.UI.WebControls.WebParts; //package must be referenced using System.Security; using System.Runtime.InteropServices; //must reference the package namespace user { [Guid("CB5BDC81-93C1-11CF-8F20-00805F2CD064"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] //GUID This does not need to be modified, fixed public interface IObjectSafety { //Method Definition void GetInterfacceSafyOptions(System.Int32 riid, out System.Int32 pdwSupportedOptions, out System.Int32 pdwEnabledOptions); void SetInterfaceSafetyOptions(System.Int32 riid, System.Int32 dwOptionsSetMask, System.Int32 dwEnabledOptions); } }

4. Inheritance interface

public partial class UserControl1: UserControl,IObjectSafety { public UserControl1() { InitializeComponent(); } public void GetInterfacceSafyOptions(System.Int32 riid, out System.Int32 pdwSupportedOptions, out System.Int32 pdwEnabledOptions) { pdwSupportedOptions = 1; //Do not modify this code pdwEnabledOptions = 2; //do not modify this code return; } public void SetInterfaceSafetyOptions(System.Int32 riid, System.Int32 dwOptionsSetMask, System.Int32 dwEnabledOptions) { return; } public void YourFunc(){} }

Introducing two namespaces in UserControl1

using System.Security;

using System.Runtime.InteropServices;

6. Tools--Create GUID--New GUID--Select the fifth item--Copy, you can close the small window, and then paste under the namespace, as follows

namespace user { [Guid("7F29ACED-AD84-4EEE-9E1A-58BE255F9EF7")] //This GUID is used when referring to web public partial class UserControl1: UserControl,IObjectSafety { ……

7. *** One step, item--user attribute (*** one item), two places need to be modified

① Applications--Assembly Info--√ Make Assembly COM Visible

② Generate--√ Register for COM interoperability

8. Right click on project user--generate

II. Web Use of ActiveX Controls

The web call is very concise, referencing the dll file just generated, and then adding

It's done. Note that: there is "classid: " in the string inside classid here, don't forget, followed by the GUID generated in step 6, must be consistent!

After reading the above, do you know how to develop ActiveX controls in C#and use web calls? If you still want to learn more skills or want to know more related content, welcome to pay attention to the industry information channel, thank you for reading!

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