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digitalmars.D.learn - Window procedure declaration

reply V <v pathlink.com> writes:
I can't seem to assign my WNDCLASSA structures wndproc field the same 
way I did in C.

<code>
WNDCLASSA wcex;
wcex.style		= 0;
wcex.lpfnWndProc	= cast(WNDPROC) wndProc;
</code>

Compiler errors:

App.d(40): function app.wndProc (HANDLE,uint,uint,int) does not match 
argument types ()
App.d(40): Error: expected 4 arguments, not 0


Also how do I declare the procedure?  This causes errors:

<code>
LRESULT CALLBACK wndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM 
lParam)
</code>

app.d(62): semicolon expected, not 'wndProc'
app.d(62): found 'hWnd' when expecting ')'
app.d(62): semicolon expected, not 'message'
app.d(62): no identifier for declarator message
app.d(62): semicolon expected, not 'wParam'
app.d(62): no identifier for declarator wParam
app.d(62): semicolon expected, not 'lParam'
app.d(62): no identifier for declarator lParam
app.d(62): semicolon expected, not ')'
app.d(62): Declaration expected, not ')'
app.d(70): Declaration expected, not 'case'
app.d(77): Declaration expected, not 'case'
app.d(81): Declaration expected, not 'case'
app.d(91): Declaration expected, not 'default'
app.d(93): unrecognized declaration
Mar 22 2005
next sibling parent "John C" <johnch_atms hotmail.com> writes:
"V" <v pathlink.com> wrote in message 
news:d1r499$1jh3$1 digitaldaemon.com...

I can't seem to assign my WNDCLASSA structures wndproc field the same way I 
did in C.

 <code>
 WNDCLASSA wcex;
 wcex.style = 0;
 wcex.lpfnWndProc = cast(WNDPROC) wndProc;
 </code>



Use the address of the function instead.

    wcex.lpfnWndProc = &wndProc;


 Compiler errors:

 App.d(40): function app.wndProc (HANDLE,uint,uint,int) does not match 
 argument types ()
 App.d(40): Error: expected 4 arguments, not 0


 Also how do I declare the procedure?  This causes errors:

 <code>
 LRESULT CALLBACK wndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM 
 lParam)
 </code>

 app.d(62): semicolon expected, not 'wndProc'
 app.d(62): found 'hWnd' when expecting ')'
 app.d(62): semicolon expected, not 'message'
 app.d(62): no identifier for declarator message
 app.d(62): semicolon expected, not 'wParam'
 app.d(62): no identifier for declarator wParam
 app.d(62): semicolon expected, not 'lParam'
 app.d(62): no identifier for declarator lParam
 app.d(62): semicolon expected, not ')'
 app.d(62): Declaration expected, not ')'
 app.d(70): Declaration expected, not 'case'
 app.d(77): Declaration expected, not 'case'
 app.d(81): Declaration expected, not 'case'
 app.d(91): Declaration expected, not 'default'
 app.d(93): unrecognized declaration
Mar 23 2005
prev sibling next sibling parent reply Chris Sauls <ibisbasenji gmail.com> writes:
V wrote:

 Also how do I declare the procedure?  This causes errors:
 
 <code>
 LRESULT CALLBACK wndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM 
 lParam)
 </code>



You need to use D's extern attribute.  I believe this is the correct way:
# extern(Win32)
# LRESULT wndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
#   // ...
# }

-- Chris Sauls
Mar 23 2005
parent reply John Reimer <brk_6502 yahoo.com> writes:
Chris Sauls wrote:

 V wrote:
 

 Also how do I declare the procedure?  This causes errors:

 <code>
 LRESULT CALLBACK wndProc(HWND hWnd, UINT message, WPARAM wParam, 
 LPARAM lParam)
 </code>



 
 You need to use D's extern attribute.  I believe this is the correct way:
 # extern(Win32)
 # LRESULT wndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
 #   // ...
 # }
 
 -- Chris Sauls



Actually this should be "extern(Windows)", but the idea was correct.

His problem seems to have arisen from an absence of both the "&" 
operator and the extern(Windows).

-JJR
Mar 23 2005
parent reply Chris Sauls <ibisbasenji gmail.com> writes:
John Reimer wrote:

 Actually this should be "extern(Windows)", but the idea was correct.



I realized that about... three seconds ago.  :)  Alas.

Also would be helpful to check out these two pages from the specs:
http://www.digitalmars.com/d/windows.html
http://www.digitalmars.com/d/dll.html

-- Chris Sauls
Mar 23 2005
parent reply V <v pathlink.com> writes:
Chris Sauls wrote:

 John Reimer wrote:
 

 Actually this should be "extern(Windows)", but the idea was correct.



 
 I realized that about... three seconds ago.  :)  Alas.
 
 Also would be helpful to check out these two pages from the specs:
 http://www.digitalmars.com/d/windows.html
 http://www.digitalmars.com/d/dll.html
 
 -- Chris Sauls



Thank you all for the help :D

I've noticed that some functions are missing from std.c.windows.windows like
BOOL DestroyWindow(HWND hWnd) and BOOL UnregisterClassA(LPCSTR 
lpClassName, HINSTANCE hInstance) and some of the defines like 
WS_EX_CLIENTEDGE.  Are any of these going to be added or do I have to 
define each function as an extern?
Mar 23 2005
parent reply John Reimer <brk_6502 yahoo.com> writes:
V wrote:

 Chris Sauls wrote:
 

 John Reimer wrote:


 Actually this should be "extern(Windows)", but the idea was correct.





 I realized that about... three seconds ago.  :)  Alas.

 Also would be helpful to check out these two pages from the specs:
 http://www.digitalmars.com/d/windows.html
 http://www.digitalmars.com/d/dll.html

 -- Chris Sauls



 
 Thank you all for the help :D
 
 I've noticed that some functions are missing from std.c.windows.windows 
 like
 BOOL DestroyWindow(HWND hWnd) and BOOL UnregisterClassA(LPCSTR 
 lpClassName, HINSTANCE hInstance) and some of the defines like 
 WS_EX_CLIENTEDGE.  Are any of these going to be added or do I have to 
 define each function as an extern?



There are many win32 functions missing from std.c.windows.windows. 
Check www.dsource.org/projects/core32 for a more complete D win32 import.

-JJR
Mar 23 2005
parent reply Stewart Gordon <smjg_1998 yahoo.com> writes:
John Reimer wrote:
<snip>

 There are many win32 functions missing from std.c.windows.windows. Check 
 www.dsource.org/projects/core32 for a more complete D win32 import.



That one's old and, by the looks of it, no longer maintained.  You want 
this one:
http://www.dsource.org/projects/bindings/wiki/WindowsApi

Stewart.
Jan 06 2009
parent Stewart Gordon <smjg_1998 yahoo.com> writes:
Stewart Gordon wrote:

 John Reimer wrote:
 <snip>

 There are many win32 functions missing from std.c.windows.windows. 
 Check www.dsource.org/projects/core32 for a more complete D win32 import.



 That one's old and, by the looks of it, no longer maintained.  You want 
 this one:
 http://www.dsource.org/projects/bindings/wiki/WindowsApi



Silly me, should've realised I was replying to an old thread.  I guess 
it's one of the natural consequences of switching newsreaders.

Stewart.
Jan 06 2009
prev sibling parent reply "Regan Heath" <regan netwin.co.nz> writes:
On Tue, 22 Mar 2005 22:51:06 -0800, V <v pathlink.com> wrote:

 I can't seem to assign my WNDCLASSA structures wndproc field the same  
 way I did in C.

 <code>
 WNDCLASSA wcex;
 wcex.style		= 0;
 wcex.lpfnWndProc	= cast(WNDPROC) wndProc;
 </code>

 Compiler errors:

 App.d(40): function app.wndProc (HANDLE,uint,uint,int) does not match  
 argument types ()
 App.d(40): Error: expected 4 arguments, not 0



Try:

wcex.lpfnWndProc	= cast(WNDPROC)&wndProc;


 Also how do I declare the procedure?  This causes errors:

 <code>
 LRESULT CALLBACK wndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM  
 lParam)
 </code>

 app.d(62): semicolon expected, not 'wndProc'
 app.d(62): found 'hWnd' when expecting ')'
 app.d(62): semicolon expected, not 'message'
 app.d(62): no identifier for declarator message
 app.d(62): semicolon expected, not 'wParam'
 app.d(62): no identifier for declarator wParam
 app.d(62): semicolon expected, not 'lParam'
 app.d(62): no identifier for declarator lParam
 app.d(62): semicolon expected, not ')'
 app.d(62): Declaration expected, not ')'
 app.d(70): Declaration expected, not 'case'
 app.d(77): Declaration expected, not 'case'
 app.d(81): Declaration expected, not 'case'
 app.d(91): Declaration expected, not 'default'
 app.d(93): unrecognized declaration



Remove "CALLBACK". Add extern(C) eg.

extern (C) LRESULT wndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM  
lParam)
{
}

CALLBACK is typically a define for __stdcall which is replaced in D with  
extern (C), see:

http://www.digitalmars.com/d/interface.html

Regan
Mar 23 2005
parent reply John Reimer <brk_6502 yahoo.com> writes:
Regan Heath wrote:


 
 Remove "CALLBACK". Add extern(C) eg.
 
 extern (C) LRESULT wndProc(HWND hWnd, UINT message, WPARAM wParam, 
 LPARAM  lParam)
 {
 }
 
 CALLBACK is typically a define for __stdcall which is replaced in D 
 with  extern (C), see:
 
 http://www.digitalmars.com/d/interface.html
 
 Regan



Oops.  Good point, Regan.  I missed the CALLBACK.  Don't need that there!
Mar 23 2005
parent reply "Regan Heath" <regan netwin.co.nz> writes:
On Wed, 23 Mar 2005 15:08:00 -0800, John Reimer <brk_6502 yahoo.com> wrote:

 Regan Heath wrote:


  Remove "CALLBACK". Add extern(C) eg.
  extern (C) LRESULT wndProc(HWND hWnd, UINT message, WPARAM wParam,  
 LPARAM  lParam)
 {
 }
  CALLBACK is typically a define for __stdcall which is replaced in D  
 with  extern (C), see:
  http://www.digitalmars.com/d/interface.html
  Regan



 Oops.  Good point, Regan.  I missed the CALLBACK.  Don't need that there!



Is it extern (C) or extern (Windows) though? I'm not sure.

Regan
Mar 23 2005
parent "Carlos Santander B." <csantander619 gmail.com> writes:
Regan Heath wrote:

 On Wed, 23 Mar 2005 15:08:00 -0800, John Reimer <brk_6502 yahoo.com> wrote:
 

 Regan Heath wrote:


  Remove "CALLBACK". Add extern(C) eg.
  extern (C) LRESULT wndProc(HWND hWnd, UINT message, WPARAM wParam,  
 LPARAM  lParam)
 {
 }
  CALLBACK is typically a define for __stdcall which is replaced in D  
 with  extern (C), see:
  http://www.digitalmars.com/d/interface.html
  Regan




 Oops.  Good point, Regan.  I missed the CALLBACK.  Don't need that there!



 
 Is it extern (C) or extern (Windows) though? I'm not sure.
 
 Regan



Windows


_______________________
Carlos Santander Bernal
Mar 23 2005