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POcURL post data to asp.net page
 

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    <p>I am trying to call the <code>__doPostback</code> javascript function in a asp.net page from php using curl.</p> <p>I learnt that this can be done by making a post request to the asp.net page with the appropriate parameters.</p> <p>So in curl, </p> <ol> <li>I make a get request / just use <code>file_get_contents</code> to retrieve the initial page.</li> <li>From this, I extract the values for <code>__VIEWSTATE</code> and <code>__EVENTVALIDATION</code>.</li> </ol> <p>So far everything seems ok.</p> <p>Now, I understand that we need to make a post request using cURL with <code>__VIEWSTATE</code> and other parameters required. ( values for the fields present in the asp.net form )</p> <p>I am unable to construct the <code>CURLOPT_POSTFIELDS</code> correctly.</p> <p>For instance, I am trying this out,</p> <pre><code>$postoptions1='__EVENTTARGET='.('ctl00$ContentPlaceHolder1$gRef').'&amp;__EVENTARGUMENT='.('$2'); $postoptions2 = '&amp;__VIEWSTATE='.urlencode($viewState) ; $otherparams = '&amp;ctl00$ContentPlaceHolder1$ddlName=Abc'; </code></pre> <p>And before using setopt for <code>CURLOPT_POSTFIELDS</code>, I am doing,</p> <pre><code>urlencode ($postoptions1.$postoptions2.$otherparams) </code></pre> <p>This does not work. The submit results are not shown, which means, the required parameter <code>__VIEWSTATE</code> was not found in my post request.</p> <p>If I change the order of the parameters and place <code>__VIEWSTATE</code> as the first parameter, the results page is shown but the other parameter values are not honoured. </p> <p>I think there is some problem with the way I am encoding the parameters.</p> <p>Please tell me how to construct the parameters for the post request to a asp.net page.</p> <p>Thanks.</p> <p>--Edited--</p> <p>Here is the complete code: $resultsPerPage='10'; $url = "www.example.com"; // url changed </p> <p>$curl_connection = curl_init($url); function sendCurl($curl_connection,$url,$params,$isPost=false) {</p> <pre><code>//$post_string = $params; $post_string = http_build_query($params); //$post_string = build_query_string($params); //$post_string = urlencode($params); echo 'After Encode'.$post_string; $cookie="/cookie.txt"; //set options curl_setopt($curl_connection, CURLOPT_CONNECTTIMEOUT, 300); curl_setopt($curl_connection, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"); curl_setopt($curl_connection, CURLOPT_RETURNTRANSFER, true); curl_setopt($curl_connection, CURLOPT_HEADER, 0); // don't return headers curl_setopt($curl_connection, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, 1); curl_setopt($curl_connection,CURLOPT_REFERER, $url); if($isPost) { curl_setopt ($curl_connection, CURLOPT_POST, true); //set data to be posted curl_setopt($curl_connection, CURLOPT_POSTFIELDS, $post_string); curl_setopt($curl_connection,CURLOPT_COOKIEJAR,$cookie); } else { curl_setopt($curl_connection,CURLOPT_COOKIEFILE,$cookie); } $response1 = curl_exec($curl_connection); if($response1 === false) { echo 'Curl error: ' . curl_error($curl_connection); } else { echo 'Operation completed without any errors'; } return $response1; } **// First time, get request to asp.net page </code></pre> <p><code>$response1 = sendCurl($curl_connection,$url,'',false);<br> $viewState=getVStateContent($response1);<br> $eventValidation =getEventValidationContent($response1);<br> $simpleParams = '&amp;__VIEWSTATE='.$viewState.'&amp;ctl00$ContentPlaceHolder1$ddlManuf=&amp;ctl00$ContentPlaceHolder1$ddlCrossType=&amp;ctl00$ContentPlaceHolder1$ddlPageSize='.$resultsPerPage.'&amp;ctl00$ContentPlaceHolder1$btnSearch=Search&amp;ctl00_ToolkitScriptManager1_HiddenField=&amp;__EVENTTARGET=&amp;__EVENTARGUMENT=';<br> // Second post - for submitting the search form<br> $response2= sendCurl($curl_connection,$url,$simpleParams,true);</code> ----**</p>
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