WINCE与WM的差异(1)－查询文件系统目录结构

我在便携设备上写程序，需要查询设备上的文件系统目录结构，比如，我要知道设备的外部存储卡的目录，还要知道设备的flash分区的目录。这样，我要保存文件的时候，尽量先往存储卡上写，如果没有插卡，再往flash分区写。

 

首先查找MSDN，找到了FindFirstFlashCard这组API可用。

很高兴，在WM的SDK上编译链接过了，在WM设备上使用也很成功。

 

我又换了一台WINCE的设备，用CE5的SDK编译我的程序，编译不过，没有找到FindFirstFlashCard函数。

无奈，查找资料，又找到了FindFirstStore、FindFirstPartition这组API可以在CE上使用。

 

但是，FindFirstStore、FindFirstPartition在WM SDK中只有声明，没有定义，链接不过。

 

再无奈，只好在代码里面用宏定义来区分WINCE和WM，分别使用这两组API。

 

再找找有没有其他的办法。

 

试验代码如下：

//FindFirstFlashCard

{  int index;  // Total number of storage cards found.  int iNumOfFlashCard = 0;      // Maximum number of storage cards to find.  int iMaxCards = 10;  // Whether to continue searching after finding a card.  BOOL bContinue = TRUE;        // Root directory path of storage cards.  TCHAR szRootDirPath[MAX_PATH];    // String for storing the storage card name with the full path.  TCHAR szSCName[MAX_PATH];         // Search handle for storage cards.  HANDLE hFlashCard;          // Structure for storing card information.  WIN32_FIND_DATA *lpwfdFlashCard;   // Structure for storing card information temporarily.  WIN32_FIND_DATA *lpwfdFlashCardTmp;  lpwfdFlashCardTmp = (WIN32_FIND_DATA *) LocalAlloc   (LPTR, iMaxCards * sizeof (WIN32_FIND_DATA));  // Test for failed memory allocation.  if (lpwfdFlashCardTmp == NULL)   return 0;  hFlashCard = FindFirstFlashCard (&lpwfdFlashCardTmp [0]);  if (hFlashCard == INVALID_HANDLE_VALUE)  {   // Free the memory.   LocalFree (lpwfdFlashCardTmp);    return 0;  }  while (bContinue)  {   iNumOfFlashCard += 1;   // Search for the next storage card.   bContinue = FindNextFlashCard (hFlashCard,    &lpwfdFlashCardTmp [iNumOfFlashCard]);  }  // Close the search handle.  FindClose (hFlashCard);           if (iNumOfFlashCard > 0)  {   // Allocate memory for lpwfdFlashCard.   lpwfdFlashCard = (WIN32_FIND_DATA *) LocalAlloc    (LPTR, iNumOfFlashCard * sizeof (WIN32_FIND_DATA));   // Test for failed memory allocation.   if (lpwfdFlashCard == NULL)    {    // Free the temp card memory.    LocalFree (lpwfdFlashCardTmp);     return 0;   }   // Assign lpwfdFlashCardTmp to lpwfdFlashCard.   for (index=0; index < iNumOfFlashCard; ++index)   {    lpwfdFlashCard [index] = lpwfdFlashCardTmp [index];   }   // Free the memory.   LocalFree (lpwfdFlashCard);   }  LocalFree (lpwfdFlashCardTmp); }

 

//FindFirstStore {  PARTINFO partinfo;  STOREINFO storeinfo, storeinfo2;  HANDLE hand1,hand2;  BOOL bContinue = TRUE;        int iNumOfFlashCard = 0;        memset(&storeinfo2, 0, sizeof(storeinfo2));  storeinfo2.cbSize = sizeof(storeinfo2);  hand1 = FindFirstStore(&storeinfo2);  if (hand1 == INVALID_HANDLE_VALUE)  {   DWORD ret = GetLastError();   return FALSE;  }

  bContinue = TRUE;  iNumOfFlashCard = 0;  while (bContinue)  {   iNumOfFlashCard += 1;   memset(&storeinfo, 0, sizeof(storeinfo));   storeinfo.cbSize = sizeof(storeinfo);   bContinue = FindNextStore (hand1,&storeinfo);  }  FindCloseStore(hand1);//  hand1 = OpenStore(storeinfo2.szDeviceName);  if (hand1 == INVALID_HANDLE_VALUE)  {   DWORD ret = GetLastError();   return FALSE;  }

  memset(&partinfo, 0, sizeof(partinfo));  partinfo.cbSize = sizeof(partinfo);  hand2 = FindFirstPartition(hand1, &partinfo);  if (hand2 == INVALID_HANDLE_VALUE)  {   DWORD ret = GetLastError();   return FALSE;  }  bContinue = TRUE;  iNumOfFlashCard = 0;  while (bContinue)  {   iNumOfFlashCard += 1;   memset(&partinfo, 0, sizeof(partinfo));   partinfo.cbSize = sizeof(partinfo);   bContinue = FindNextPartition (hand2,&partinfo);  }  FindClosePartition(hand2); }