無法檢測到連接的智能卡

Question

我希望能夠檢測到智能卡讀卡器，然後檢測智能卡是否已插入到智能卡讀卡器中。當運行下面的代碼時，出現Debug Assertion失敗的錯誤。

#include <stdio.h> 
#include <winscard.h> 
#include <tchar.h> 
#pragma comment(lib, "winscard.lib") 

HRESULT __cdecl main() 
{ 
HRESULT   hr = S_OK; 
LPTSTR   szReaders, szRdr; 
DWORD    cchReaders = SCARD_AUTOALLOCATE; 
DWORD    dwI, dwRdrCount; 
SCARD_READERSTATE rgscState[MAXIMUM_SMARTCARD_READERS]; 
TCHAR    szCard[MAX_PATH]; 
SCARDCONTEXT  hSC; 
LONG    lReturn; 

// Establish the card to watch for. 
// Multiple cards can be looked for, but 
// this sample looks for only one card. 
_tcscat_s (szCard, MAX_PATH * sizeof(TCHAR), TEXT("GemSAFE")); 
szCard[lstrlen(szCard) + 1] = 0; // Double trailing zero. 

// Establish a context. 
lReturn = SCardEstablishContext(SCARD_SCOPE_USER, 
           NULL, 
           NULL, 
           &hSC); 
if (SCARD_S_SUCCESS != lReturn) 
{ 
    printf("Failed SCardEstablishContext\n"); 
    exit(1); 
} 

// Determine which readers are available. 
lReturn = SCardListReaders(hSC, 
          NULL, 
          (LPTSTR)&szReaders, 
          &cchReaders); 
if (SCARD_S_SUCCESS != lReturn) 
{ 
    printf("Failed SCardListReaders\n"); 
    exit(1); 
} 
// Place the readers into the state array. 
szRdr = szReaders; 
for (dwI = 0; dwI < MAXIMUM_SMARTCARD_READERS; dwI++) 
{ 
    if (0 == *szRdr) 
     break; 
    rgscState[dwI].szReader = szRdr; 
    rgscState[dwI].dwCurrentState = SCARD_STATE_UNAWARE; 
    szRdr += lstrlen(szRdr) + 1; 
} 
dwRdrCount = dwI; 

// If any readers are available, proceed. 
if (0 != dwRdrCount) 
{ 
    for (;;) 
    { 
    // Look for the card. 
    lReturn = SCardLocateCards(hSC, 
           szCard, 
           rgscState, 
           dwRdrCount); 
    if (SCARD_S_SUCCESS != lReturn) 
    { 
     printf("Failed SCardLocateCards\n"); 
     exit(1); 
    } 

    // Look through the array of readers. 
    for (dwI=0; dwI < dwRdrCount; dwI++) 
    { 
     if (0 != (SCARD_STATE_ATRMATCH & 
        rgscState[dwI].dwEventState)) 
     { 
      _tprintf(TEXT("Card '%s' found in reader '%s'.\n"), 
        szCard, 
        rgscState[dwI].szReader); 
      SCardFreeMemory(hSC, 
          szReaders); 
      return 0; // Context will be release automatically. 
     } 
     // Update the state. 
     rgscState[dwI].dwCurrentState = rgscState[dwI].dwEventState; 
    } 

    // Card not found yet; wait until there is a change. 
    lReturn = SCardGetStatusChange(hSC, 
           INFINITE, // infinite wait 
           rgscState, 
           dwRdrCount); 
    if (SCARD_S_SUCCESS != lReturn) 
    { 
    printf("Failed SCardGetStatusChange\n"); 
    exit(1); 
    } 
} // for (;;) 
} 
else 
    printf("No readers available\n"); 

// Release the context. 
lReturn = SCardReleaseContext(hSC); 
if (SCARD_S_SUCCESS != lReturn) 
{ 
    printf("Failed SCardReleaseContext\n"); 
    exit(1); 
} 

SCardFreeMemory(hSC, 
       szReaders); 

return hr; 
} 

錯誤：

更新： 我加

memset(rgscState, 0, sizeof(SCARD_READERSTATE); 

的代碼和它的工作。但它不能找到插入智能卡讀卡器的智能卡。當檢測到卡時，應該忽略下面的代碼，但是因爲它沒有找到插入的智能卡，所以它運行下面的代碼。

if (SCARD_S_SUCCESS != lReturn) 
    { 
     printf("Failed SCardLocateCards\n"); 
     exit(1); 
    } 

Answer 1

如果有人有興趣，我加

memset(rgscState, 0, sizeof(SCARD_READERSTATE); 

，我沒有得到的錯誤了。