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D - Conflicting argument types that don't conflict?

reply J C Calvarese <jcc7 cox.net> writes:
I've got an error message that I wish was more helpful. I wonder if 
anyone has run into a similar problem before (and found a solution).


direct.d(548): function Blt (tagRECT *,IDirectDrawSurface ,tagRECT 
*,uint,DDBLTFX *) does not match argument types (tagRECT 
*,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)


Allow me to break it down:

(tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)
     ||         ||                  ||      ||    ||
(tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)

They look to be identical to me.

I think the problem might be interface-related (Blt is defined in an 
interface), but I'm unsure what exactly the problem is. The code is 
spread across several modules, so that is probably part of the problem.

It's possible that the data types are defined in different places with 
slightly different definitions, but this code used to compile so I do 
suspect a subtle compiler bug. I'll probably try to put together a bug 
report, but it'll probably take some time to pare it down and I'm not 
looking forward to it.


-- 
Justin
http://jcc_7.tripod.com/d/
Apr 07 2004
next sibling parent reply Dave Sieber <dsieber spamnot.sbcglobal.net> writes:
J C Calvarese <jcc7 cox.net> wrote:


 I've got an error message that I wish was more helpful. I wonder if 
 anyone has run into a similar problem before (and found a solution).



Yes, I had this same thing, and I was puzzled for a while. It turned out 
that there was an overload of the function (with different arguments) 
somewhere else, and I had to qualify the function call, either with the 
explicit module name, or with '.', as in ".printf()". I'm sorry I don't 
have the details -- I fixed it and moved on. But one of the above should 
resolve it.

It was something that bothered me, as I really felt it should have worked 
as written. It was "unintuitive" (as it seems to be for you too) because I 
had to sit down and try to figure out the reasoning behind the error.

-- 
dave
Apr 07 2004
parent reply J C Calvarese <jcc7 cox.net> writes:
Dave Sieber wrote:

 J C Calvarese <jcc7 cox.net> wrote:
 
 

I've got an error message that I wish was more helpful. I wonder if 
anyone has run into a similar problem before (and found a solution).



 
 Yes, I had this same thing, and I was puzzled for a while. It turned out 
 that there was an overload of the function (with different arguments) 
 somewhere else, and I had to qualify the function call, either with the 
 explicit module name, or with '.', as in ".printf()". I'm sorry I don't 
 have the details -- I fixed it and moved on. But one of the above should 
 resolve it.



That's how I treat errors that I fix, too: problem solved, case closed.

Thanks for the suggestion. I can only find one Blt, though. And I think 
I've casted everything that I can cast and it still doesn't work.


/* from win32\directx\directdraw.d */

interface IDirectDrawSurface : IUnknown
{
     /*** IUnknown methods ***/
     //	HRESULT QueryInterface( REFIID riid, LPVOID * ppvObj);
     //	ULONG   AddRef();
     //	ULONG   Release();
     /*** IDirectDrawSurface methods ***/
     HRESULT AddAttachedSurface( LPDIRECTDRAWSURFACE );
     HRESULT AddOverlayDirtyRect( LPRECT );
     HRESULT Blt( LPRECT,LPDIRECTDRAWSURFACE, LPRECT,DWORD, LPDDBLTFX );
     HRESULT BltBatch( LPDDBLTBATCH, DWORD, DWORD );
     HRESULT BltFast( DWORD,DWORD,LPDIRECTDRAWSURFACE, LPRECT,DWORD );
     HRESULT DeleteAttachedSurface( DWORD,LPDIRECTDRAWSURFACE );

     // other methods ...

}



/* from win32\directx\direct.d */

     primSurface.Blt(cast(jcc7.win32.wtypes.tagRECT*) &destination,
     cast(IDirectDrawSurface) backingSurface, cast(tagRECT*) &source,
     cast(uint) DDBLT_WAIT, cast(DDBLTFX*) null );



By the way, I'm working with code that I downloaded rather than stuff 
I've written myself from scratch, so there's a reasonable chance that I 
just don't know what I'm doing. :)


 
 It was something that bothered me, as I really felt it should have worked 
 as written. It was "unintuitive" (as it seems to be for you too) because I 
 had to sit down and try to figure out the reasoning behind the error.
 





-- 
Justin
http://jcc_7.tripod.com/d/
Apr 07 2004
parent reply "Derek Parnell" <Derek.Parnell psyc.ward> writes:
On Wed, 07 Apr 2004 19:23:31 -0500 (08/Apr/04 10:23:31 AM)
, J C Calvarese <jcc7 cox.net> wrote:


 Dave Sieber wrote:

 J C Calvarese <jcc7 cox.net> wrote:


 I've got an error message that I wish was more helpful. I wonder if  
 anyone has run into a similar problem before (and found a solution).



 out that there was an overload of the function (with different  
 arguments) somewhere else, and I had to qualify the function call,  
 either with the explicit module name, or with '.', as in ".printf()".  
 I'm sorry I don't have the details -- I fixed it and moved on. But one  
 of the above should resolve it.



 That's how I treat errors that I fix, too: problem solved, case closed.

 Thanks for the suggestion. I can only find one Blt, though. And I think  
 I've casted everything that I can cast and it still doesn't work.



Can you rename the Blt function you found. If there is only one, then  
references to it should fail with an unknown function message.


-- 
Derek
Apr 07 2004
parent J C Calvarese <jcc7 cox.net> writes:
Derek Parnell wrote:

 On Wed, 07 Apr 2004 19:23:31 -0500 (08/Apr/04 10:23:31 AM)
 , J C Calvarese <jcc7 cox.net> wrote:
 

 Dave Sieber wrote:


 J C Calvarese <jcc7 cox.net> wrote:


 I've got an error message that I wish was more helpful. I wonder if  
 anyone has run into a similar problem before (and found a solution).



   Yes, I had this same thing, and I was puzzled for a while. It 
 turned  out that there was an overload of the function (with 
 different  arguments) somewhere else, and I had to qualify the 
 function call,  either with the explicit module name, or with '.', as 
 in ".printf()".  I'm sorry I don't have the details -- I fixed it and 
 moved on. But one  of the above should resolve it.




 That's how I treat errors that I fix, too: problem solved, case closed.

 Thanks for the suggestion. I can only find one Blt, though. And I 
 think  I've casted everything that I can cast and it still doesn't work.



 
 Can you rename the Blt function you found. If there is only one, then  
 references to it should fail with an unknown function message.
 



Good idea.

If I change the one in directdraw, I get this:
direct.d(548): no property 'Blt' for type 'IDirectDrawSurface'

I think there's only one Blt function. Perhaps I found an interface bug. 
  Thanks for your help.


-- 
Justin
http://jcc_7.tripod.com/d/
Apr 07 2004
prev sibling parent reply "Phill" <phill pacific.net.au> writes:
I had a very similar problem when trying to
connect with a socket.
I was calling the fuction correctly, but I was
getting the same error as you.

Being a novice, after a week I gave up on it,
and downloaded Vathix's socket.d and
associated files.

Problem solved ! :o))

Phill.


"J C Calvarese" <jcc7 cox.net> wrote in message
news:c521m3$1j8k$1 digitaldaemon.com...

 I've got an error message that I wish was more helpful. I wonder if
 anyone has run into a similar problem before (and found a solution).


 direct.d(548): function Blt (tagRECT *,IDirectDrawSurface ,tagRECT
 *,uint,DDBLTFX *) does not match argument types (tagRECT
 *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)


 Allow me to break it down:

 (tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)
      ||         ||                  ||      ||    ||
 (tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)

 They look to be identical to me.

 I think the problem might be interface-related (Blt is defined in an
 interface), but I'm unsure what exactly the problem is. The code is
 spread across several modules, so that is probably part of the problem.

 It's possible that the data types are defined in different places with
 slightly different definitions, but this code used to compile so I do
 suspect a subtle compiler bug. I'll probably try to put together a bug
 report, but it'll probably take some time to pare it down and I'm not
 looking forward to it.


 --
 Justin
 http://jcc_7.tripod.com/d/




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Apr 08 2004
parent reply J C Calvarese <jcc7 cox.net> writes:
Phill wrote:

 I had a very similar problem when trying to
 connect with a socket.
 I was calling the fuction correctly, but I was
 getting the same error as you.
 
 Being a novice, after a week I gave up on it,
 and downloaded Vathix's socket.d and
 associated files.
 
 Problem solved ! :o))
 
 Phill.



I finally hammered my problem down to a couple of files.

I think my problem is caused by the necessary types being defined in the 
private scope in each file. I guess I know how to *solve* it, but I 
still wonder whether it's an *error* or a *bug*. If it's an error, I'd 
like to understand what's actually wrong with the code.


How I compile it:  dmd direct.d -c


Here's my error message:

direct.d(25): function Blt
(tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)
does not match argument types
(tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)



/* *** *** directdraw.d *** *** */

module directdraw;

private
{
     alias int HRESULT;
     alias uint DWORD;

     struct tagRECT{}
     alias tagRECT* LPRECT;
}

extern(Windows)
{
     alias IDirectDrawSurface LPDIRECTDRAWSURFACE;		
     struct DDBLTFX{}	

     interface IDirectDrawSurface
     {
     HRESULT Blt(LPRECT, LPDIRECTDRAWSURFACE, LPRECT, DWORD, DDBLTFX*);
     }	
}

enum: uint { DDBLT_WAIT = 0x01000000 }



/* *** *** direct.d *** *** */

module direct;

private import directdraw;

private
{
     struct tagRECT{}
     alias tagRECT RECT;
     alias tagRECT* LPRECT;
}

class DirectApp
{
     IDirectDrawSurface primSurface;
     IDirectDrawSurface backingSurface;

     public this(){}

     public void updatePrimarySurface()
     {		
         RECT source;
         RECT destination;
         primSurface.Blt(
             cast(tagRECT*) &destination, /* line 25 */
             cast(IDirectDrawSurface) backingSurface,
             cast(tagRECT*) &source,
             cast(uint) DDBLT_WAIT,
             cast(DDBLTFX*) null );
     }
}



-- 
Justin
http://jcc_7.tripod.com/d/
Apr 13 2004
parent reply "Walter" <newshound digitalmars.com> writes:
The problem is that the function linkage types don't match. Deriving from
IUnknown makes it an extern (Windows) function linkage, which doesn't match
the default extern (D) linkage.

"J C Calvarese" <jcc7 cox.net> wrote in message
news:c5ig16$4lp$1 digitaldaemon.com...

 Phill wrote:

 I had a very similar problem when trying to
 connect with a socket.
 I was calling the fuction correctly, but I was
 getting the same error as you.

 Being a novice, after a week I gave up on it,
 and downloaded Vathix's socket.d and
 associated files.

 Problem solved ! :o))

 Phill.



 I finally hammered my problem down to a couple of files.

 I think my problem is caused by the necessary types being defined in the
 private scope in each file. I guess I know how to *solve* it, but I
 still wonder whether it's an *error* or a *bug*. If it's an error, I'd
 like to understand what's actually wrong with the code.


 How I compile it:  dmd direct.d -c


 Here's my error message:

 direct.d(25): function Blt
 (tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)
 does not match argument types
 (tagRECT *,IDirectDrawSurface ,tagRECT *,uint,DDBLTFX *)



 /* *** *** directdraw.d *** *** */

 module directdraw;

 private
 {
      alias int HRESULT;
      alias uint DWORD;

      struct tagRECT{}
      alias tagRECT* LPRECT;
 }

 extern(Windows)
 {
      alias IDirectDrawSurface LPDIRECTDRAWSURFACE;
      struct DDBLTFX{}

      interface IDirectDrawSurface
      {
      HRESULT Blt(LPRECT, LPDIRECTDRAWSURFACE, LPRECT, DWORD, DDBLTFX*);
      }
 }

 enum: uint { DDBLT_WAIT = 0x01000000 }



 /* *** *** direct.d *** *** */

 module direct;

 private import directdraw;

 private
 {
      struct tagRECT{}
      alias tagRECT RECT;
      alias tagRECT* LPRECT;
 }

 class DirectApp
 {
      IDirectDrawSurface primSurface;
      IDirectDrawSurface backingSurface;

      public this(){}

      public void updatePrimarySurface()
      {
          RECT source;
          RECT destination;
          primSurface.Blt(
              cast(tagRECT*) &destination, /* line 25 */
              cast(IDirectDrawSurface) backingSurface,
              cast(tagRECT*) &source,
              cast(uint) DDBLT_WAIT,
              cast(DDBLTFX*) null );
      }
 }



 -- 
 Justin
 http://jcc_7.tripod.com/d/
Oct 25 2004
parent J C Calvarese <jcc7 cox.net> writes:
Walter wrote:

 The problem is that the function linkage types don't match. Deriving from
 IUnknown makes it an extern (Windows) function linkage, which doesn't match
 the default extern (D) linkage.



Ah, well, I suppose that would explain it. I'll look for that next time.

Too bad the error message doesn't mention the function linkage in 
particular. ;)

Thanks for the tip.


 
 "J C Calvarese" <jcc7 cox.net> wrote in message
 news:c5ig16$4lp$1 digitaldaemon.com...



-- 
Justin (a/k/a jcc7)
http://jcc_7.tripod.com/d/
Oct 25 2004