DDK & C++

OSR_Community_User · July 27, 2006, 10:32am

Hi, All.

I have an example driver. Its written in C++ and consists of many .cpp
and .h files.

I need the main source file(where we have DriverEntry) to be in C.
When I just change the extension to .c, I’m getting many errors in
header files included by main.c(cause they are in C++).

Can I somehow avoid that?
Maybe passing some directives to #include?

Thanks.

Gary_Little-2 · July 27, 2006, 10:41am

You need to wrap DriverEntry with “extern “C””, like this:

extern “C”
{
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath);
}

You will also need to add any WDM or KMDF callbacks to this scope.

Gary G. Little

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of
xxxxx@voliacable.com
Sent: Thursday, July 27, 2006 9:32 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] DDK & C++

Hi, All.

I have an example driver. Its written in C++ and consists of many .cpp
and .h files.

I need the main source file(where we have DriverEntry) to be in C.
When I just change the extension to .c, I’m getting many errors in
header files included by main.c(cause they are in C++).

Can I somehow avoid that?
Maybe passing some directives to #include?

Thanks.

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

To unsubscribe, visit the List Server section of OSR Online at
http://www.osronline.com/page.cfm?name=ListServer

OSR_Community_User · July 27, 2006, 11:22am

> You need to wrap DriverEntry with “extern “C””
extern “C” NTSTATUS DriverEntry(… is good enough.

Additionally, be ready to:

wrap some or all headers into

extern “C” {
#include <some_header.h>
}

(if your DDK is old enough; otherwise you get linker errors “can’t find
DdkFunc@#$!h*&^…” - linker looks for a C++ aka decorated name)

2) declare functions that are mentioned in alloc_text pragmas as extern
“C”.

----- Original Message -----
From:
To: “Windows System Software Devs Interest List”
Sent: Thursday, July 27, 2006 10:40 AM
Subject: RE: [ntdev] DDK & C++

> You need to wrap DriverEntry with “extern “C””, like this:
>
> extern “C”
> {
> NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,
> IN PUNICODE_STRING RegistryPath);
> }
>
> You will also need to add any WDM or KMDF callbacks to this scope.
>
> Gary G. Little
>
> -----Original Message-----
> From: xxxxx@lists.osr.com
> [mailto:xxxxx@lists.osr.com] On Behalf Of
> xxxxx@voliacable.com
> Sent: Thursday, July 27, 2006 9:32 AM
> To: Windows System Software Devs Interest List
> Subject: [ntdev] DDK & C++
>
> Hi, All.
>
> I have an example driver. Its written in C++ and consists of many .cpp
> and .h files.
>
> I need the main source file(where we have DriverEntry) to be in C.
> When I just change the extension to .c, I’m getting many errors in
> header files included by main.c(cause they are in C++).
>
> Can I somehow avoid that?
> Maybe passing some directives to #include?
>
>
> Thanks.
>
>
> —
> Questions? First check the Kernel Driver FAQ at
> http://www.osronline.com/article.cfm?id=256
>
> To unsubscribe, visit the List Server section of OSR Online at
> http://www.osronline.com/page.cfm?name=ListServer
>
> —
> Questions? First check the Kernel Driver FAQ at
> http://www.osronline.com/article.cfm?id=256
>
> To unsubscribe, visit the List Server section of OSR Online at
> http://www.osronline.com/page.cfm?name=ListServer</some_header.h>

OSR_Community_User · July 27, 2006, 11:24am

Slowly putting on flame proof outerwear…

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of
xxxxx@seagate.com
Sent: Thursday, July 27, 2006 10:41 AM
To: Windows System Software Devs Interest List
Subject: RE: [ntdev] DDK & C++

You need to wrap DriverEntry with “extern “C””, like this:

extern “C”
{
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath);
}

You will also need to add any WDM or KMDF callbacks to this scope.

Gary G. Little

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of
xxxxx@voliacable.com
Sent: Thursday, July 27, 2006 9:32 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] DDK & C++

Hi, All.

I have an example driver. Its written in C++ and consists of many .cpp
and .h files.

I need the main source file(where we have DriverEntry) to be in C.
When I just change the extension to .c, I’m getting many errors in
header files included by main.c(cause they are in C++).

Can I somehow avoid that?
Maybe passing some directives to #include?

Thanks.

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

To unsubscribe, visit the List Server section of OSR Online at
http://www.osronline.com/page.cfm?name=ListServer

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

To unsubscribe, visit the List Server section of OSR Online at
http://www.osronline.com/page.cfm?name=ListServer

Maxim_S_Shatskih · July 27, 2006, 11:32am

#ifdef __cplusplus can help. Defined during C++ compile, not defined during
C compile.

Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com

----- Original Message -----
From: “Shadow”
To: “Windows System Software Devs Interest List”
Sent: Thursday, July 27, 2006 6:31 PM
Subject: [ntdev] DDK & C++

> Hi, All.
>
> I have an example driver. Its written in C++ and consists of many .cpp
> and .h files.
>
> I need the main source file(where we have DriverEntry) to be in C.
> When I just change the extension to .c, I’m getting many errors in
> header files included by main.c(cause they are in C++).
>
> Can I somehow avoid that?
> Maybe passing some directives to #include?
>
>
> Thanks.
>
>
> —
> Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256
>
> To unsubscribe, visit the List Server section of OSR Online at
http://www.osronline.com/page.cfm?name=ListServer

Gary_Little-2 · July 27, 2006, 11:54am

Oh … OUTTER wear … first time I read that, my elder eyes read UNDER
wear …

Gary G. Little

-----Original Message-----
xxxxx@lists.osr.com] On Behalf Of Roddy, Mark
Sent: Thursday, July 27, 2006 10:23 AM
To: Windows System Software Devs Interest List
Subject: RE: [ntdev] DDK & C++

Slowly putting on flame proof outerwear…

OSR_Community_User · July 28, 2006, 1:37am

> I have an example driver. Its written in C++ and consists of many .cpp

and .h files.

I need the main source file(where we have DriverEntry) to be in C.
When I just change the extension to .c, I’m getting many errors in
header files included by main.c(cause they are in C++).

Can I somehow avoid that?
Maybe passing some directives to #include?

Don’t want to sound annoying but why do you need your main source file to be
in C? You would save a lot of headache if you could have it in C++.

Option 1/See what functions is your main .c file calling and in the .cpp
files declare them as extern “C”. Write a minimal .h with the appropriate
declaration (without extern “C” since it’s a C++ keyword meaning, hello I’m
doing C++ and I’d like to link C…) and voilà!

Option 2/Try extern “C++” around your .h

Like this

extern “C++”
{
#include <omg.h>
#include <cplusplusuberalles.h>
…
}

I’m not sure it’s supported in this way (“Hello I’m doing C and I’d like to
link C++” but you could give it a try. The problem is that your .h might
have declarations which are not C compliant, such as classes. If this is the
case you need to go for option 1.

Hope this helps.

–

EA</cplusplusuberalles.h></omg.h>