Re: Locking drives and folders

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#17285

From: Early Ehlinger
Date: Thu, 27 Mar 2003 21:25

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"Mehmet Caner" <fekinci37@hotmail.com> wrote:
>   fResult = DeviceIoControl (hDevice, VWIN32_DIOC_DOS_IOCTL, &regs,
>                              sizeof(regs), &regs, sizeof(regs), &cb, 0);
>
>   if (!fResult || (regs.reg_Flags & 0x0001)) return FALSE;
>   else return fResult;
> }

> 2.  I tried CreateFile and DeviceIoControl functions for locking folders,
> but it failed. Any tip please?

Are you sure DeviceIoControl failed?  DeviceIoControl returns an HRESULT.

From MSDN:

    If the method succeeds, the return value is S_OK.

From winerror.h:

    #define S_OK ((HRESULT)0x00000000L)

Therefore using !fResult to check the return from DeviceIoControl is going
to make you think that it failed when it really succeeded.


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