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(PHP Extension) PC/SC Wait for Smart Card Status Change (Inserted, Removed from Reader, etc.)See more SCard ExamplesDemonstrates how to synchronously wait for a status change, such as for a smart card to be inserted into a reader, or removed from a reader. Note: This functionality was introduced in Chilkat v9.5.0.87.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $scard = new CkSCard(); // First establish a context to the PC/SC Resource Manager $success = $scard->EstablishContext('user'); if ($success == false) { print $scard->lastErrorText() . "\n"; exit; } // First we'll examine the state of all connected readers to see which have smartcards already inserted.. // Get JSON containing information about the smartcards currently inserted into readers. // This also includes information about USB security tokens. $json = new CkJsonObject(); $success = $scard->FindSmartcards($json); if ($success == false) { print $scard->lastErrorText() . "\n"; exit; } // When writing this example, I have 3 smart card readers plugged into my system. // One of them has a smart card inserted. // Here's the JSON returned by FindSmartcards... // { // "reader": [ // { // "name": "Alcor Micro USB Smart Card Reader 0", // "state": "empty" // }, // { // "name": "Generic Smart Card Reader Interface 0", // "state": "present", // "vendorName": "Generic", // "serialNumber": "3230303730383138303030303030303030", // "systemName": "Generic Smart Card Reader Interface 0", // "card": { // "atr": "3BFC180000813180459067464A00641606F2727E00E0", // "windows": { // "miniDriver": "tagliov70px.dll", // "cryptoProvider": "Microsoft Base Smart Card Crypto Provider", // "keyStorageProvider": "Microsoft Smart Card Key Storage Provider" // } // } // }, // { // "name": "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0", // "state": "empty" // } // ] // } $json->put_EmitCompact(false); print $json->emit() . "\n"; print ' ' . "\n"; // We can iterate over the JSON to find the readers with a smart card already inserted.. $sbState = new CkStringBuilder(); $i = 0; $count_i = $json->SizeOfArray('reader'); while ($i < $count_i) { $json->put_I($i); $name = $json->stringOf('reader[i].name'); $sbState->Clear(); $json->StringOfSb('reader[i].state',$sbState); if ($sbState->Contains('present',true) == true) { print $name . ' has a smart card inserted.' . "\n"; } else { print $name . ' does not have a smart card inserted.' . "\n"; } $i = $i + 1; } print ' ' . "\n"; // Now let's begin the code to wait for a change (where a smart card gets inserted or removed) // Get the list of all readers. $stReaders = new CkStringTable(); $success = $scard->ListReaders($stReaders); if ($success == false) { print $scard->lastErrorText() . "\n"; exit; } // Show the reader names.. $numReaders = $stReaders->get_Count(); $i = 0; while ($i < $numReaders) { print $i . ': ' . $stReaders->stringAt($i) . "\n"; $i = $i + 1; } // Sample output from the above loop. // 0: Alcor Micro USB Smart Card Reader 0 // 1: Generic Smart Card Reader Interface 0 // 2: SCM Microsystems Inc. SCR33x USB Smart Card Reader 0 // // Synchronously wait 30 seconds for a card to be inserted or removed from any of the above readers. $json2 = new CkJsonObject(); $success = $scard->GetStatusChange(30000,$stReaders,$json2); if ($success == false) { print $scard->lastErrorText() . "\n"; exit; } print ' ' . "\n"; // Let's see what happened... $json2->put_EmitCompact(false); print $json2->emit() . "\n"; print ' ' . "\n"; // This is what json2 contains. // A card was inserted into the reader named "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0" // The "numChanged" indicates that one reader's status changed. // The "changed":true indicates the reader that changed. The state is now "present". // { // "numChanged": 1, // "reader": [ // { // "name": "Alcor Micro USB Smart Card Reader 0", // "changed": false, // "state": "empty" // }, // { // "name": "Generic Smart Card Reader Interface 0", // "changed": false, // "state": "present", // "atr": "3BFC180000813180459067464A00641606F2727E00E0" // }, // { // "name": "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0", // "changed": true, // "state": "present", // "atr": "3BDF96FF8131FE455A018048494443313158587300011B09" // } // ] // } // Find the reader that changed... $numChanged = $json2->IntOf('numChanged'); print 'number of readers with a changed state: ' . $numChanged . "\n"; $i = 0; $count_i = $json2->SizeOfArray('reader'); while ($i < $count_i) { $json2->put_I($i); $changed = $json2->BoolOf('reader[i].changed'); if ($changed == true) { $name = $json2->stringOf('reader[i].name'); $state = $json2->stringOf('reader[i].state'); print 'Changed: ' . "\n"; print ' reader name: ' . $name . "\n"; print ' new state: ' . $state . "\n"; // If a card is now in this reader, we should have the ATR of the card.. if ($json2->HasMember('reader[i].atr') == true) { $atr = $json2->stringOf('reader[i].atr'); print ' ATR of card inserted into this reader: ' . $atr . "\n"; } } $i = $i + 1; } // The output from the above loop: // number of readers with a changed state: 1 // Changed: // reader name: SCM Microsystems Inc. SCR33x USB Smart Card Reader 0 // new state: present // ATR of card inserted into this reader: 3BDF96FF8131FE455A018048494443313158587300011B09 // Applications should always release the context when finished. $success = $scard->ReleaseContext(); if ($success == false) { print $scard->lastErrorText() . "\n"; } ?> |
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