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4/8/2010

Windows Mobile software for Windows Mobile Professional and Windows Mobile Classic provides the FindFirstFlashCardand the FindNextFlashCardfunctions to programmatically enumerate storage cards. FindFirstFlashCardreturns a search handle that FindNextFlashCarduses. It also returns a pointer to the first storage card, if any. FindNextFlashCardreturns a pointer to the next storage card and a BOOLvalue indicating whether the search was successful. The following code example shows how to use FindFirstFlashCardand FindNextFlashCardto locate storage cards on Windows Mobile Professional or Windows Mobile Classic devices.

Note:
Because a device can have multiple storage cards with various names, your application cannot make any assumptions about the naming of or path to a particular card.

Example

Copy Code 
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;
// 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;
hFlashCard = (&lpwfdFlashCardTmp [0]);
if (hFlashCard == INVALID_HANDLE_VALUE)
{
   // Free the memory.
   LocalFree (lpwfdFlashCardTmp);
   return;
}
while (bContinue)
{
   iNumOfFlashCard += 1;
   // Search for the next storage card.
   bContinue =  (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;
   }
   // Assign lpwfdFlashCardTmp to lpwfdFlashCard.
   for (index=0; index < iNumOfFlashCard; ++index)
   {
	lpwfdFlashCard [index] = lpwfdFlashCardTmp [index];
   }
// Free the memory.
   LocalFree (lpwfdFlashCard);
}
LocalFree (lpwfdFlashCardTmp);

See Also