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(Unicode C) 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.
#include <C_CkSCardW.h> #include <C_CkJsonObjectW.h> #include <C_CkStringBuilderW.h> #include <C_CkStringTableW.h> void ChilkatSample(void) { HCkSCardW scard; BOOL success; HCkJsonObjectW json; const wchar_t *name; HCkStringBuilderW sbState; int i; int count_i; HCkStringTableW stReaders; int numReaders; HCkJsonObjectW json2; BOOL changed; const wchar_t *state; const wchar_t *atr; int numChanged; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. scard = CkSCardW_Create(); // First establish a context to the PC/SC Resource Manager success = CkSCardW_EstablishContext(scard,L"user"); if (success == FALSE) { wprintf(L"%s\n",CkSCardW_lastErrorText(scard)); CkSCardW_Dispose(scard); return; } // 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 = CkJsonObjectW_Create(); success = CkSCardW_FindSmartcards(scard,json); if (success == FALSE) { wprintf(L"%s\n",CkSCardW_lastErrorText(scard)); CkSCardW_Dispose(scard); CkJsonObjectW_Dispose(json); return; } // 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" // } // ] // } CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); wprintf(L" \n"); // We can iterate over the JSON to find the readers with a smart card already inserted.. sbState = CkStringBuilderW_Create(); i = 0; count_i = CkJsonObjectW_SizeOfArray(json,L"reader"); while (i < count_i) { CkJsonObjectW_putI(json,i); name = CkJsonObjectW_stringOf(json,L"reader[i].name"); CkStringBuilderW_Clear(sbState); CkJsonObjectW_StringOfSb(json,L"reader[i].state",sbState); if (CkStringBuilderW_Contains(sbState,L"present",TRUE) == TRUE) { wprintf(L"%s has a smart card inserted.\n",name); } else { wprintf(L"%s does not have a smart card inserted.\n",name); } i = i + 1; } wprintf(L" \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 = CkStringTableW_Create(); success = CkSCardW_ListReaders(scard,stReaders); if (success == FALSE) { wprintf(L"%s\n",CkSCardW_lastErrorText(scard)); CkSCardW_Dispose(scard); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbState); CkStringTableW_Dispose(stReaders); return; } // Show the reader names.. numReaders = CkStringTableW_getCount(stReaders); i = 0; while (i < numReaders) { wprintf(L"%d: %s\n",i,CkStringTableW_stringAt(stReaders,i)); 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 = CkJsonObjectW_Create(); success = CkSCardW_GetStatusChange(scard,30000,stReaders,json2); if (success == FALSE) { wprintf(L"%s\n",CkSCardW_lastErrorText(scard)); CkSCardW_Dispose(scard); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbState); CkStringTableW_Dispose(stReaders); CkJsonObjectW_Dispose(json2); return; } wprintf(L" \n"); // Let's see what happened... CkJsonObjectW_putEmitCompact(json2,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json2)); wprintf(L" \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 = CkJsonObjectW_IntOf(json2,L"numChanged"); wprintf(L"number of readers with a changed state: %d\n",numChanged); i = 0; count_i = CkJsonObjectW_SizeOfArray(json2,L"reader"); while (i < count_i) { CkJsonObjectW_putI(json2,i); changed = CkJsonObjectW_BoolOf(json2,L"reader[i].changed"); if (changed == TRUE) { name = CkJsonObjectW_stringOf(json2,L"reader[i].name"); state = CkJsonObjectW_stringOf(json2,L"reader[i].state"); wprintf(L"Changed: \n"); wprintf(L" reader name: %s\n",name); wprintf(L" new state: %s\n",state); // If a card is now in this reader, we should have the ATR of the card.. if (CkJsonObjectW_HasMember(json2,L"reader[i].atr") == TRUE) { atr = CkJsonObjectW_stringOf(json2,L"reader[i].atr"); wprintf(L" ATR of card inserted into this reader: %s\n",atr); } } 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 = CkSCardW_ReleaseContext(scard); if (success == FALSE) { wprintf(L"%s\n",CkSCardW_lastErrorText(scard)); } CkSCardW_Dispose(scard); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbState); CkStringTableW_Dispose(stReaders); CkJsonObjectW_Dispose(json2); } |
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