Re: [Dev-C++] Error compiling "file_one" from tutorials.

[Nick <en...@ho...>]

Hello,

> This is from the Forger's Win32 API tutorials.  I tried to compile the
> example "file_one" but in File_one.c I got the following error
> messages:
> 
> 17 file_one.c
>   warning: converting NULL to non-pointer type

Ok, NULL is used for pointers. Make sure that NULL is being 
assigned to a pointer (eg: char * and not char)
Actually, looking at the call below, should you really be assigning a 
NULL pointer to the above code or should it be the NUL character 
instead '\0'?
> 
> 25 file_one.c
>   ANSI C++ forbids implicit conversion from `void *' in assignment

Ok, generally, *.c files are compiled as C, not C++. C allows the 
implicit conversion, whereas C++ does not. You must provide a 
cast for the returned value (or compile as a C program).
> 
> 49 file_one.c
>   warning: converting NULL to non-pointer type

As above...
> 
> 57 file_one.c
>   ANSI C++ forbids implicit conversion from `void *' in assignment

Again...
> 
> 179 file_one.c
>   warning: converting NULL to non-pointer type
> 
Again...
> 0
> 
> Both have the following same line of code:
> 
>    pszText = GlobalAlloc(GPTR, dwTextLength + 1);


Ok, using the above variable notation, I would assume that pszText 
is defined as char * or equivalent (pointer to NUL terminated array 
of char.) 

pszText = (char *) GlobalAlloc(GPTR, dwTextLength + 1);

Hopefully that helped, otherwise feel free to post more of the 
offending code, or a link if it's online.

--
regards,

Nick