Re: Problems writing boot record to removable media under WinME

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#11023

From: Bob Gonder
Date: Thu, 04 Mar 2004 19:13

52 lines
2723 bytes

Walt Morrey wrote:

>//------------------------------------------------------------------
>BOOL WriteSectors(int drive, DWORD startinglogicalsector, int numberofsectors, char*buffer)
>{
>       hDevice = CreateFile(_devicename,
>             GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
>             NULL, OPEN_EXISTING, 0, NULL);

Once again I'll ask:  Are you going to Write to this "file" or just
Read it?  If you are going to write to it, why are you opening it in
read-only mode?


Comparing Write code vs Read code:

Write:
>       reg.reg_ESI = 0x0001 ;          // for write BOOT
>       reg.reg_ECX = -1 ;
>       reg.reg_EBX = (DWORD)(&ControlBlock);
>       reg.reg_EDX = drive+1;
>       reg.reg_EAX = 0x7305 ;
>
>       fResult = DeviceIoControl ( hDevice, VWIN32_DIOC_DOS_DRIVEINFO,
>          &(reg), sizeof (reg),
>          &(reg), sizeof (reg),
>          &cb,0);
>

Read:
>   reg.reg_Flags = 0x8000;

Flags is different

>   reg.reg_ESI = 0x00 ;
>   reg.reg_ECX = -1 ;
>   reg.reg_EBX = (DWORD)(&ControlBlock);
>   reg.reg_EDX = drive+1;
>   reg.reg_EAX = 0x7305 ;
>
>   fResult = DeviceIoControl ( hDevice,
>     6,

6 is different (maybe not, but why invite errors?)

>     &(reg),
>     sizeof (reg),
>     &(reg),
>     sizeof (reg),
>     &cb,
>     0);
>

Technical Details

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: Problems writing boot record to removable media under WinME
Date: Thu, 04 Mar 2004 11:13:22 -0800
Organization: MindSpring Enterprises, Inc.
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