我如何使用asp.net C＃在Web应用程序中显示捕获的指纹

Question

i am trying to integrate Fingerprint scanner with my asp.net Web Application..but iam unable to use the picture box..

private void btnInitialize_Click(object sender, EventArgs e)
        {
            try
            {
                bmp = null;
                pictCaptureImg.Image= bmp;

                if (!csd200Obj.isDeviceConnected())
                {
                    MessageBox.Show("Please Connect Device...");
                    return;
                }

                if (!csd200Obj.isDeviceInitialized())
                {
                    int nRc = csd200Obj.initializeScanner();
                    if (nRc != CSD200APICodes.SUCCESS)
                    {
                        MessageBox.Show("3M Cogent CSD200 scanner initialization failed. Error Code: " + nRc, "3M Cogent CSD200");
                        return;
                    }
                }
                MessageBox.Show("Initialization Successful", "3M Cogent CSD200");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Iam getting error at this line pictCaptureImg.Image= bmp; because mine is a web application.Can u please let me know how can i use picture box in asp.net web application and how can i show my captured fingerprints there?

Answer 1

You need to use client-side code to access fingerprint device. Also you must check what software interface libraries your device provides with it. For example, if it comes with an ActiveX, you should install the ActiveX and use it in your web client code javascript. If it provides plugins for specific browsers, you should use that plugins. Another option (but with security risks) is to use java applet. Please note that accessing hardware from inside web client is restricted by browsers because of security issues. Using different technologies has their restrictions and benefits:

• ActiveX: You are restricted to Internet Explorer only. If your device does not come with an ActiveX library, you can create one in C#. Creating ActiveX in c# is not a complicated job!
• Plugins: If your device does not come with plugin libraries for different browsers, you may write plugins for browsers you want to support. Writing plugin for each browser may be different and specific to each browser.
• Java Applet: You can create a java applet if you can write java code. It is also not a complicated job, because more of the stuff can be done in native libraries.