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How to compile 32 bit app that uses Wow64DisableWow64FsRedirection with BDS 2006

Posted on 2009-05-19
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Last Modified: 2013-11-17
Hello, I'm trying to compile my 32 bit application written with the C plus plus builder personality of BDS 2006.

The problem is that I need to use the API function Wow64DisableWow64FsRedirection. MSDN states that _WIN32_WINNT must be defined to 0x0501 or higher, but if I do such definition, the compiler gives me the following error:

[C++ Error] Windows.hpp(2435): E2040 Declaration terminated incorrectly

This error is related to this definition:

static const Shortint WTS_CONSOLE_CONNECT = 0x1;

Many errors like this follows the first. I cannot understand why the compiler gives me the error. If I avoid to redefine _WIN32_WINNT everything compiles except the point where I use the needed function.

Any ideas?

Thanks in advance.
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Question by:uuderzo
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8 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 24433795
You can circumvent that by loading 'Wow64DisableWow64FsRedirection()' dynamically from kernel32.dll, e.g.
typedef BOOL WINAPI (*FPTR_Wow64DisableWow64FsRedirection)(PVOID*);
typedef BOOL WINAPI (*FPTR_Wow64RevertWow64FsRedirection)(PVOID);
 
// ...
 
PVOID pOldValue;
 
FPTR_Wow64DisableWow64FsRedirection pWow64DisableWow64FsRedirection = GetProcAddress(GetModuleHandle(_T("kernel32.dll"),_T("Wow64DisableWow64FsRedirection"));
FPTR_Wow64RevertWow64FsRedirection pWow64RevertWow64FsRedirection = GetProcAddress(GetModuleHandle(_T("kernel32.dll"),_T("Wow64RevertWow64FsRedirection"));
 
(*pWow64DisableWow64FsRedirection)(&pOldValue);
 
// do stuff
 
(*pWow64RevertWow64FsRedirection)(pOldValue);

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Author Comment

by:uuderzo
ID: 24435690
Wow! That works!
Thank you very much for your solution!

But... just to know... is there a reason of this malfunction? Is it the compiler or the header file?

Thanks again!
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Author Closing Comment

by:uuderzo
ID: 31582955
I'd never tought to this approach. Nice one, even if I still wonder why the compiler gives me that error.
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LVL 86

Expert Comment

by:jkr
ID: 24435719
Not sure about Borland compilers - if you really want to find ut why that happens, have the preprocessor expand the whole header set and have a look at the lines before that specific error.
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LVL 86

Expert Comment

by:jkr
ID: 24437610
Hum, as a closing word - that should be
typedef BOOL WINAPI (*FPTR_Wow64DisableWow64FsRedirection)(PVOID*);
typedef BOOL WINAPI (*FPTR_Wow64RevertWow64FsRedirection)(PVOID);
 
// ...
 
PVOID pOldValue;
 
FPTR_Wow64DisableWow64FsRedirection pWow64DisableWow64FsRedirection =
(FPTR_Wow64DisableWow64FsRedirection)GetProcAddress(GetModuleHandle(_T("kernel32.dll"),_T("Wow64DisableWow64FsRedirection"));
FPTR_Wow64RevertWow64FsRedirection pWow64RevertWow64FsRedirection = 
(FPTR_Wow64RevertWow64FsRedirection)GetProcAddress(GetModuleHandle(_T("kernel32.dll"),_T("Wow64RevertWow64FsRedirection"));
 
(*pWow64DisableWow64FsRedirection)(&pOldValue);
 
// do stuff
 
(*pWow64RevertWow64FsRedirection)(pOldValue);

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Author Comment

by:uuderzo
ID: 24440310
You're right, the typecast was missing in your answer.
No matter, I managed to make it working.

Thank you for your correction.
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