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Ejecter tiroir cdrom sous 95/98/me

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Description

Il ejecte le tiroir du cdrom.

Source / Exemple :


/*
   Program to programmatically eject removable media from a drive on
   Windows 95.

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#include <windows.h> #include <stdio.h> #include <ctype.h> //----------------------------------------------------------------------- // DeviceIoControl infrastructure #if !defined (VWIN32_DIOC_DOS_IOCTL) #define VWIN32_DIOC_DOS_IOCTL 1 typedef struct _DIOC_REGISTERS { DWORD reg_EBX; DWORD reg_EDX; DWORD reg_ECX; DWORD reg_EAX; DWORD reg_EDI; DWORD reg_ESI; DWORD reg_Flags; } DIOC_REGISTERS, *PDIOC_REGISTERS; #endif // Intel x86 processor status flags #define CARRY_FLAG 0x0001 //----------------------------------------------------------------------- // DOS IOCTL function support #pragma pack(1) // Parameters for locking/unlocking removable media typedef struct _PARAMBLOCK { BYTE bOperation; BYTE bNumLocks; } PARAMBLOCK, *PPARAMBLOCK; #pragma pack() //----------------------------------------------------------------------- // Win95 low-level media unlocking/removal support HANDLE WINAPI OpenVWin32 (void); BOOL WINAPI CloseVWin32 (HANDLE hVWin32); BOOL WINAPI UnlockLogicalVolume (HANDLE hVWin32, BYTE bDriveNum); BOOL WINAPI LockLogicalVolume (HANDLE hVWin32, BYTE bDriveNum, BYTE bLockLevel, WORD wPermissions); BOOL UnlockMedia (HANDLE hVWin32, BYTE bDrive); BOOL EjectMedia (HANDLE hVWin32, BYTE bDrive); /*----------------------------------------------------------------------- main () This program ejects media from the specified drive, if the media is removable and the device supports software-controlled media removal. The command line arguments are: eject drive For example: eject E: This code works on Windows 95 only, but does not check for Windows 95. -----------------------------------------------------------------------*/ void main (int argc, char **argv) { HANDLE hVWin32 = INVALID_HANDLE_VALUE; BYTE bDrive; BOOL fDriveLocked = FALSE; if (argc !=2) { printf("usage: eject drive\n"); return; } // convert command line arg 1 from a drive letter to a DOS drive // number bDrive = (toupper (argv[1][0]) - 'A') + 1; hVWin32 = OpenVWin32 (); // Make sure no other applications are using the drive. fDriveLocked = LockLogicalVolume (hVWin32, bDrive, 0, 0); if (!fDriveLocked) { printf("volume %c is in use by another application; therefore, it " "cannot be ejected\n", 'A' + bDrive - 1); goto CLEANUP_AND_EXIT_APP; } // Make sure there is no software lock keeping the media in the drive. if (!UnlockMedia (hVWin32, bDrive)) { printf("could not unlock media from drive %c:\n", 'A' + bDrive - 1); goto CLEANUP_AND_EXIT_APP; } // Eject the media if (!EjectMedia (hVWin32, bDrive)) { printf("could not eject media from drive %c:\n", 'A' + bDrive - 1); } CLEANUP_AND_EXIT_APP: if (fDriveLocked) UnlockLogicalVolume (hVWin32, bDrive); if (hVWin32 != INVALID_HANDLE_VALUE) CloseVWin32 (hVWin32); } /*----------------------------------------------------------------------- UnlockMedia (hVWin32, bDrive) Purpose: Unlocks removable media from the specified drive so that it can be ejected. Parameters: hVWin32 A handle to VWIN32. Used to issue request to unlock the media. bDrive The logical drive number to unlock. 0 = default, 1 = A, 2 = B, etc. Return Value: If successful, returns TRUE; if unsuccessful, returns FALSE. -----------------------------------------------------------------------*/ BOOL UnlockMedia (HANDLE hVWin32, BYTE bDrive) { DIOC_REGISTERS regs = {0}; PARAMBLOCK unlockParams = {0}; int i; BOOL fResult; DWORD cb; // First, check the lock status. This way, you'll know the number of // pending locks you must unlock. unlockParams.bOperation = 2; // return lock/unlock status regs.reg_EAX = 0x440D; regs.reg_EBX = bDrive; regs.reg_ECX = MAKEWORD(0x48, 0x08); regs.reg_EDX = (DWORD)&unlockParams; fResult = DeviceIoControl (hVWin32, VWIN32_DIOC_DOS_IOCTL, &regs, sizeof(regs), &regs, sizeof(regs), &cb, 0); // See if DeviceIoControl and the unlock succeeded. if (fResult) { /* DeviceIoControl succeeded. Now see if the unlock succeeded. It succeeded if the carry flag is not set, or if the carry flag is set but EAX is 0x01 or 0xB0. It failed if the carry flag is set and EAX is not 0x01 or 0xB0. If the carry flag is clear, then unlock succeeded. However, you don't need to set fResult because it is already TRUE when you get in here.
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if (regs.reg_Flags & CARRY_FLAG) fResult = (regs.reg_EAX == 0xB0) || (regs.reg_EAX == 0x01); } if (!fResult) return (FALSE); // Now, let's unlock the media for every time it has been locked; // this will totally unlock the media. for (i = 0; i < unlockParams.bNumLocks; ++i) { unlockParams.bOperation = 1; // unlock the media regs.reg_EAX = 0x440D; regs.reg_EBX = bDrive; regs.reg_ECX = MAKEWORD(0x48, 0x08); regs.reg_EDX = (DWORD)&unlockParams; fResult = DeviceIoControl (hVWin32, VWIN32_DIOC_DOS_IOCTL, &regs, sizeof(regs), &regs, sizeof(regs), &cb, 0); // See if DeviceIoControl and the lock succeeded fResult = fResult && !(regs.reg_Flags & CARRY_FLAG); if (!fResult) break; } return fResult; } /*----------------------------------------------------------------------- EjectMedia (hVWin32, bDrive) Purpose: Ejects removable media from the specified drive. Parameters: hVWin32 A handle to VWIN32. Used to issue request to unlock the media. bDrive The logical drive number to unlock. 0 = default, 1 = A, 2 = B, etc. Return Value: If successful, returns TRUE; if unsuccessful, returns FALSE. -----------------------------------------------------------------------*/ BOOL EjectMedia (HANDLE hVWin32, BYTE bDrive) { DIOC_REGISTERS regs = {0}; BOOL fResult; DWORD cb; regs.reg_EAX = 0x440D; regs.reg_EBX = bDrive; regs.reg_ECX = MAKEWORD(0x49, 0x08); fResult = DeviceIoControl (hVWin32, VWIN32_DIOC_DOS_IOCTL, &regs, sizeof(regs), &regs, sizeof(regs), &cb, 0); // See if DeviceIoControl and the lock succeeded fResult = fResult && !(regs.reg_Flags & CARRY_FLAG); return fResult; } /*----------------------------------------------------------------------- OpenVWin32 () Purpose: Opens a handle to VWIN32 that can be used to issue low-level disk I/O commands. Parameters: None. Return Value: If successful, returns a handle to VWIN32. If unsuccessful, return INVALID_HANDLE_VALUE. Call GetLastError() to determine the cause of failure. -----------------------------------------------------------------------*/ HANDLE WINAPI OpenVWin32 (void) { return CreateFile ("\\\\.\\vwin32", 0, 0, NULL, 0, FILE_FLAG_DELETE_ON_CLOSE, NULL); } /*----------------------------------------------------------------------- CloseVWin32 (hVWin32) Purpose: Closes the handle opened by OpenVWin32. Parameters: hVWin32 An open handle to VWIN32. Return Value: If successful, returns TRUE. If unsuccessful, returns FALSE. Call GetLastError() to determine the cause of failure. -----------------------------------------------------------------------*/ BOOL WINAPI CloseVWin32 (HANDLE hVWin32) { return CloseHandle (hVWin32); } /*----------------------------------------------------------------------- LockLogicalVolume (hVWin32, bDriveNum, bLockLevel, wPermissions) Purpose: Takes a logical volume lock on a logical volume. Parameters: hVWin32 An open handle to VWIN32. bDriveNum The logical drive number to lock. 0 = default, 1 = A:, 2 = B:, 3 = C:, etc. bLockLevel Can be 0, 1, 2, or 3. Level 0 is an exclusive lock that can only be taken when there are no open files on the specified drive. Levels 1 through 3 form a hierarchy where 1 must be taken before 2, which must be taken before 3. wPermissions Specifies how the lock will affect file operations when lock levels 1 through 3 are taken. Also specifies whether a formatting lock should be taken after a level 0 lock. Zero is a valid permission. Return Value: If successful, returns TRUE. If unsuccessful, returns FALSE. -----------------------------------------------------------------------*/ BOOL WINAPI LockLogicalVolume (HANDLE hVWin32, BYTE bDriveNum, BYTE bLockLevel, WORD wPermissions) { BOOL fResult; DIOC_REGISTERS regs = {0}; BYTE bDeviceCat; // can be either 0x48 or 0x08 DWORD cb; /* Try first with device category 0x48 for FAT32 volumes. If it doesn't work, try again with device category 0x08. If that doesn't work, then the lock failed.
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bDeviceCat = 0x48; ATTEMPT_AGAIN: // Set up the parameters for the call. regs.reg_EAX = 0x440D; regs.reg_EBX = MAKEWORD(bDriveNum, bLockLevel); regs.reg_ECX = MAKEWORD(0x4A, bDeviceCat); regs.reg_EDX = wPermissions; fResult = DeviceIoControl (hVWin32, VWIN32_DIOC_DOS_IOCTL, &regs, sizeof(regs), &regs, sizeof(regs), &cb, 0); // See if DeviceIoControl and the lock succeeded fResult = fResult && !(regs.reg_Flags & CARRY_FLAG); // If DeviceIoControl or the lock failed, and device category 0x08 // hasn't been tried, retry the operation with device category 0x08. if (!fResult && (bDeviceCat != 0x08)) { bDeviceCat = 0x08; goto ATTEMPT_AGAIN; } return fResult; } /*----------------------------------------------------------------------- UnlockLogicalVolume (hVWin32, bDriveNum) Purpose: Unlocks a logical volume that was locked with LockLogicalVolume(). Parameters: hVWin32 An open handle to VWIN32. bDriveNum The logical drive number to unlock. 0 = default, 1 = A:, 2 = B:, 3 = C:, etc. Return Value: If successful, returns TRUE. If unsuccessful, returns FALSE. Comments: Must be called the same number of times as LockLogicalVolume() to completely unlock a volume. Only the lock owner can unlock a volume. -----------------------------------------------------------------------*/ BOOL WINAPI UnlockLogicalVolume (HANDLE hVWin32, BYTE bDriveNum) { BOOL fResult; DIOC_REGISTERS regs = {0}; BYTE bDeviceCat; // can be either 0x48 or 0x08 DWORD cb; /* Try first with device category 0x48 for FAT32 volumes. If it doesn't work, try again with device category 0x08. If that doesn't work, then the unlock failed.
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bDeviceCat = 0x48; ATTEMPT_AGAIN: // Set up the parameters for the call. regs.reg_EAX = 0x440D; regs.reg_EBX = bDriveNum; regs.reg_ECX = MAKEWORD(0x6A, bDeviceCat); fResult = DeviceIoControl (hVWin32, VWIN32_DIOC_DOS_IOCTL, &regs, sizeof(regs), &regs, sizeof(regs), &cb, 0); // See if DeviceIoControl and the unlock succeeded fResult = fResult && !(regs.reg_Flags & CARRY_FLAG); // If DeviceIoControl or the unlock failed, and device category 0x08 // hasn't been tried, retry the operation with device category 0x08. if (!fResult && (bDeviceCat != 0x08)) { bDeviceCat = 0x08; goto ATTEMPT_AGAIN; } return fResult; }

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