_getdrives
Returns a bitmask representing the currently available disk drives.
unsigned long _getdrives( void );
Возвращаемое значение
If the function succeeds, the return value is a bitmask representing the currently available disk drives. Bit position 0 (the least-significant bit) is drive A, bit position 1 is drive B, bit position 2 is drive C, and so on. If the function fails, the return value is zero. To get extended error information, call GetLastError.
Требования
Routine |
Required header |
|---|---|
_getdrives |
<direct.h> |
For more compatibility information, see Compatibility in the Introduction.
Пример
// crt_getdrives.c
// This program retrives and lists out
// all the logical drives that are
// currently mounted on the machine.
#include <windows.h>
#include <direct.h>
#include <stdio.h>
#include <tchar.h>
TCHAR g_szDrvMsg[] = _T("A:\n");
int main(int argc, char* argv[]) {
ULONG uDriveMask = _getdrives();
if (uDriveMask == 0)
{
printf( "_getdrives() failed with failure code: %d\n",
GetLastError());
}
else
{
printf("The following logical drives are being used:\n");
while (uDriveMask) {
if (uDriveMask & 1)
printf(g_szDrvMsg);
++g_szDrvMsg[0];
uDriveMask >>= 1;
}
}
}
The following logical drives are being used:
A:
C:
D:
E:
NET Framework Equivalent
Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.