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DDraw device enumerating problem

Started by Xeno Jun 26, 2000 at 2:35 PM 12 replies 900+ views

Original Post

Jun 26, 2000 at 2:35 PM

Hi all!. ok , here is my question: im trying to define my function to enumerate for directdraw devices , its looks like that: bool WINAPI DDEnumCallbackEx(GUID FAR *lpGUID, LPSTR lpDriverDescraption, LPSTR lpDriverName, LPVOID lpContext, HMONITOR hm); and im calling to this function with this code: HRESULT CEnumerate::EnumerateDevices(DD_DEVICE_INFO *DDDeviceInfo) { HRESULT hRet; hRet = DirectDrawEnumerateEx(DDEnumCallbackEx,NULL, DDENUM_ATTACHEDSECONDARYDEVICES // DDENUM_DETACHEDSECONDARYDEVICES // DDENUM_NONDISPLAYDEVICES); return hRet; } when i trying to compile my project i get this error: "c:\vsdxwlib\cenum.cpp(32) : error C2664: ''DirectDrawEnumerateExA'' : cannot convert parameter 1 from ''bool (struct _GUID *,char *,char *,void *,struct HMONITOR__ *)'' to ''int (__stdcall *)(struct _GUID *,char *,char *,void *,struct HMONITOR__ *)'' None of the functions with this name in scope match the target type" somebody know why?

thanks a lot

Posted By Xeno. Kobe Bryant - "Just believe in yourself" Visit my web site : VSoft

Don Bishop

Jun 26, 2000 at 2:50 PM

Just change the ''bool'' to ''BOOL''.

(A bool is 8-bits big in VC, and BOOL is 32-bits, so a BOOL is the same as an int, where a bool isn''t)

Xeno

Author

Xeno

Jun 26, 2000 at 3:07 PM

i did it.... no, still got the error.

i think its something with that: "(__stdcall *)" , its the only part that not the same between the two functions that displayed in the error massege,
somebody know what its mean?

Posted By Xeno.
Kobe Bryant - "Just believe in yourself"

Visit my web site : VSoft

Edited by - Xeno on June 26, 2000 4:08:24 PM

bstach

Jun 26, 2000 at 3:19 PM

Changing from a return type bool to a return type BOOL should have worked. Except for your lower case bool, your callback function declaration looks virtualy identical to the one I am using and mine compiles fine. Strange...

risingdragon3

Jun 26, 2000 at 3:27 PM

A shot into the dark here....
I too got this error, when I was using classes to encapsulate the DDraw enumeration. However from what I see, the compiler doesn''t like the declaration.:


BOOL WINAPI DDEnumCallbackEx(GUID FAR *lpGUID,
LPSTR lpDriverDescraption,
LPSTR lpDriverName,
LPVOID lpContext,
HMONITOR hm);
[\code]
WINAPI should expand to __stdcall, it does with my borland compiler. Try changing the WINAPI to __stdcall. 
[code]
BOOL __stdcall DDEnumCallbackEx(GUID FAR *lpGUID,
LPSTR lpDriverDescraption,
LPSTR lpDriverName,
LPVOID lpContext,
HMONITOR hm);
[\code]

Maybe it''s just a quirk of the MS compiler? 

C++Freak.

risingdragon3

Jun 26, 2000 at 3:29 PM

*&@#%^
How the hell do you get that nice white code textbox? Sorry about the formating of the above post..
C++freal

Xeno

Author

Xeno

Jun 26, 2000 at 3:31 PM

nope , still got this error...
ahhh its start to crack me off ,

Posted By Xeno.
Kobe Bryant - "Just believe in yourself"

Visit my web site : VSoft

Xeno

Author

Xeno

Jun 26, 2000 at 4:56 PM

Someone ?
please help.

Thanks.

CMN

Jun 26, 2000 at 5:13 PM

I don''t know, but I have found out that it sometimes helps to typecast callback pointers.

So you could try:
DirectDrawEnumerateEx((LPDDENUMCALLBACKEX)DDEnumCallbackEx, ...)

I really don''t think that this will solve your problem, but it can''t hurt to try

/CMN

Xeno

Author

Xeno

Jun 27, 2000 at 4:01 AM

still not working.....
ahhhhhhhhh

somebody know new ideas?

thanks

Posted By Xeno.
Kobe Bryant - "Just believe in yourself"

Visit my web site : VSoft

Gandalf

Jun 27, 2000 at 4:51 AM

Maybe make the callback function static?


static bool WINAPI DDEnumCallbackEx(GUID FAR *lpGUID,
LPSTR lpDriverDescraption,
LPSTR lpDriverName,
LPVOID lpContext,
HMONITOR hm);

Gandalf the White

Edited by - Gandalf on June 27, 2000 5:52:02 AM

Xeno

Author

Xeno

Jun 27, 2000 at 4:54 AM

Wow ,Gandalf its worked

Thanks a lot!.

but still im wondering , because i saw it working without "static" , in one of the SDK samples
its strange

.

Posted By Xeno.
Kobe Bryant - "Just believe in yourself"

Visit my web site : VSoft

CMN

Jun 27, 2000 at 10:56 AM

Just after posting my last replay I actually had the same problem myself, with EnumZBufferFormats, and when I typecasted the enumeration callback pointer with LPD3DENUMZBUFFERSCALLBACK (or whatever) it worked. So don''t go around thinking that I''m mental or anything

Xeno

Author

Xeno

Jun 27, 2000 at 11:34 AM

why do u think that i thinking u mental or anything ??

u just tried to help and for some reason (that really crack me off :p) for u its worked and for me not.

well, at least it working now , when i declare on the function as a static function.

Posted By Xeno.
Kobe Bryant - "Just believe in yourself"

Visit my web site : VSoft

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