Greetings,

What's up with CallWindowProc, the following code fragment causes error:

#include <windows.h>

void main()
{
WNDPROC proc;
HWND hwnd;
UINT msg;
WPARAM wparam;
LPARAM lparam;
::CallWindowProc(proc,hwnd,msg,wparam,lparam);
}


sc Test.cpp -p -mn -C -WA -S -3 -a8 -c -gf -Ic:\dm\stl -oTest.obj
Error: D:\MYPROJECTS\TEST\Test.cpp(10): need explicit cast for function
parameter 1 to get
D:\MYPROJECTS\TEST\Test.cpp(10): from: long (*std func)(void *,unsigned
,unsigned ,long )
D:\MYPROJECTS\TEST\Test.cpp(10): to  : int (*__import std func)()
Lines Processed: 124472  Errors: 1  Warnings: 0
Build failed

Dimitri Kaparis,
Independent Developer
http://www.universalstudyhelper.com - software to help you study any subject.

One returns a long, the other returns an int. The prototypes should match. -Walter

"Dimitri Kaparis" <dkaparis@universalstudyhelper.com> wrote in message news:ac2cs6$siq$1@digitaldaemon.com...
> Greetings,
>
> What's up with CallWindowProc, the following code fragment causes error:
>
> #include <windows.h>
>
> void main()
> {
> WNDPROC proc;
> HWND hwnd;
> UINT msg;
> WPARAM wparam;
> LPARAM lparam;
> ::CallWindowProc(proc,hwnd,msg,wparam,lparam);
> }
>
>
> sc Test.cpp -p -mn -C -WA -S -3 -a8 -c -gf -Ic:\dm\stl -oTest.obj
> Error: D:\MYPROJECTS\TEST\Test.cpp(10): need explicit cast for function
> parameter 1 to get
> D:\MYPROJECTS\TEST\Test.cpp(10): from: long (*std func)(void *,unsigned
> ,unsigned ,long )
> D:\MYPROJECTS\TEST\Test.cpp(10): to  : int (*__import std func)()
> Lines Processed: 124472  Errors: 1  Warnings: 0
> Build failed
>
> Dimitri Kaparis,
> Independent Developer
> http://www.universalstudyhelper.com - software to help you study any
subject.

WNDPROC is the type of the first parameter of CallWindowProc and that is exactly how it is declared in the headers. How come any difference?

PS: I just found out that compiling with STRICT defined solves this problem, but this seems to be a bug.

In article <ac3708$1hu1$1@digitaldaemon.com>, Walter says...
>
>One returns a long, the other returns an int. The prototypes should match. -Walter
>
>"Dimitri Kaparis" <dkaparis@universalstudyhelper.com> wrote in message news:ac2cs6$siq$1@digitaldaemon.com...
>> Greetings,
>>
>> What's up with CallWindowProc, the following code fragment causes error:
>>
>> #include <windows.h>
>>
>> void main()
>> {
>> WNDPROC proc;
>> HWND hwnd;
>> UINT msg;
>> WPARAM wparam;
>> LPARAM lparam;
>> ::CallWindowProc(proc,hwnd,msg,wparam,lparam);
>> }
>>
>>
>> sc Test.cpp -p -mn -C -WA -S -3 -a8 -c -gf -Ic:\dm\stl -oTest.obj
>> Error: D:\MYPROJECTS\TEST\Test.cpp(10): need explicit cast for function
>> parameter 1 to get
>> D:\MYPROJECTS\TEST\Test.cpp(10): from: long (*std func)(void *,unsigned
>> ,unsigned ,long )
>> D:\MYPROJECTS\TEST\Test.cpp(10): to  : int (*__import std func)()
>> Lines Processed: 124472  Errors: 1  Warnings: 0
>> Build failed
>>
>> Dimitri Kaparis,
>> Independent Developer
>> http://www.universalstudyhelper.com - software to help you study any
>subject.
>
>

Dimitri Kaparis,
Independent Developer
http://www.universalstudyhelper.com - software to help you study any subject.

They're Microsoft header files. There are a number of inconsistencies in them.

"Dimitri Kaparis" <dkaparis@universalstudyhelper.com> wrote in message news:ac3jhd$1t3r$1@digitaldaemon.com...
> WNDPROC is the type of the first parameter of CallWindowProc and that is
exactly
> how it is declared in the headers. How come any difference?
>
> PS: I just found out that compiling with STRICT defined solves this
problem, but
> this seems to be a bug.
>
> In article <ac3708$1hu1$1@digitaldaemon.com>, Walter says...
> >
> >One returns a long, the other returns an int. The prototypes should match. -Walter
> >
> >"Dimitri Kaparis" <dkaparis@universalstudyhelper.com> wrote in message news:ac2cs6$siq$1@digitaldaemon.com...
> >> Greetings,
> >>
> >> What's up with CallWindowProc, the following code fragment causes
error:
> >>
> >> #include <windows.h>
> >>
> >> void main()
> >> {
> >> WNDPROC proc;
> >> HWND hwnd;
> >> UINT msg;
> >> WPARAM wparam;
> >> LPARAM lparam;
> >> ::CallWindowProc(proc,hwnd,msg,wparam,lparam);
> >> }
> >>
> >>
> >> sc Test.cpp -p -mn -C -WA -S -3 -a8 -c -gf -Ic:\dm\stl -oTest.obj
> >> Error: D:\MYPROJECTS\TEST\Test.cpp(10): need explicit cast for function
> >> parameter 1 to get
> >> D:\MYPROJECTS\TEST\Test.cpp(10): from: long (*std func)(void *,unsigned
> >> ,unsigned ,long )
> >> D:\MYPROJECTS\TEST\Test.cpp(10): to  : int (*__import std func)()
> >> Lines Processed: 124472  Errors: 1  Warnings: 0
> >> Build failed
> >>
> >> Dimitri Kaparis,
> >> Independent Developer
> >> http://www.universalstudyhelper.com - software to help you study any
> >subject.
> >
> >
>
> Dimitri Kaparis,
> Independent Developer
> http://www.universalstudyhelper.com - software to help you study any
subject.