vb.net - how to get captcha image if src use java function? -


how can scrape captcha this website captchaimage.

i tried mshtml website uses java script function display retrieve captcha in it's src. please try , answer me how can achieve this.

imports mahapps.metro.controls imports system.net imports system.windows.forms   class mainwindow     inherits metrowindow      private sub metrowindow_loaded(sender object, e routedeventargs)         wb.navigate("https://www.irctc.co.in/eticketing/loginhome.jsf")         addhandler wb.loadcompleted, addressof wb_loaded     end sub     private sub btngo_click(sender object, e routedeventargs) handles btngo.click         dim htmldoc mshtml.ihtmldocument2 = wb.document         dim usrtxtdoc mshtml.ihtmlelement = htmldoc.all.item("j_username", 0)         dim usrpwddoc mshtml.ihtmlelement = htmldoc.all.item("j_password", 0)         dim captchadoc mshtml.ihtmlelement = htmldoc.all.item("j_captcha", 0)         usrtxtdoc.innertext = txtusrname.text         usrpwddoc.innertext = txtpwd.text         captchadoc.innertext = txtcaptcha.text     end sub      private sub wb_loaded(sender object, e system.windows.navigation.navigationeventargs)         msgbox("loaded")         dim htmldoc mshtml.ihtmldocument2 = wb.document         dim htmldoc2 mshtml.htmldocument = wb.document         dim captchaimg mshtml.htmlimg = htmldoc.all.item("cimage", 0)         dim bitmap new bitmapimage         bitmap.begininit()         bitmap.urisource = new uri(wb.findresource("captchaimage"))         bitmap.endinit()         imgcaptcha.source = bitmap     end sub      private sub wb_navigated(sender object, e navigationeventargs) handles wb.navigated         lblwbstatus.content = "load completed"     end sub      private sub wb_navigating(sender object, e navigatingcanceleventargs) handles wb.navigating         lblwbstatus.content = "navigating please wait"     end sub      private sub lblwbstatus_mousedoubleclick(sender object, e mousebuttoneventargs) handles lblwbstatus.mousedoubleclick         wb.refresh()     end sub end class

you can download source this link

normally this:

    dim htmldoc mshtml.ihtmldocument2 = wb.document.domdocument     dim captchaimg mshtml.htmlimg = htmldoc.all.item("cimage", 0)     dim imgrange ihtmlcontrolrange = htmldoc.body.createcontrolrange()     each img ihtmlimgelement in htmldoc.images         if img.nameprop = "captchaimage"             imgrange.add(img)             imgrange.execcommand("copy", false, nothing)             using bmp bitmap = clipboard.getdataobject().getdata(dataformats.bitmap)                 bmp.save("c:\test.bmp")             end using         end if     next

however image has alpha channel doesn't copied clipboard because of internet explorer issues (as can read here copying image page results in black image).

other ways check on internet explorer cache, image won't cached because of http headers, out of luck.


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