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[C++] HFONT issue
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Zand
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PostPosted: Mon Jul 21, 2008 2:58 am    Post subject: Reply with quote
So making it a global works?
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manc
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PostPosted: Mon Jul 21, 2008 3:19 am    Post subject: Reply with quote
I didn't need to, I just had to take my compiler off Unicode. o.O Thanks anyways though.
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Snootae
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PostPosted: Mon Jul 21, 2008 10:05 am    Post subject: Reply with quote
by the way, the reason you got an already declared error is because you made it like this:

FONT hfDefault

and then made it again

FONT hfDefault = (HFONT)GetStockObject(DEFAULT_GUI_FONT);

if you include the type (FONT) then you are declaring it


if you do it like so:
FONT = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
this is simply setting what it is after you declare
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Heartless
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PostPosted: Mon Jul 21, 2008 11:38 am    Post subject: Reply with quote
http://winprog.org/tutorial/errors.html

Quote:
Error C2440: cannot convert from 'void*' to 'HICON__ *' (or similar)
If you're compiling the code from this tutorial, it means that you are trying to compile it as C++ code. The code is written for the bcc32 and VC++ C compilers, and as such may not compile exactly the same under C++ since C++ has much stricter rules about converting types. C will just let it happen, C++ wants to you to make it explicit.

VC++ (and most compilers) will automatically compile a file with a .cpp extension as C++ code, and a file with a .c extension as C code. If you have added the tutorial code to a .cpp file, this is the most likely reason of getting this error.

If you're compiling code not from this tutorial, I can't guarantee that it's correct and therefor it may actually be an error that needs resolving. You'll have to use your own judgement to determine if it's safe to cast the value and remove the error, or if you are actually trying to make a variable be something it's not.
Fixing
If you want to use C, simply rename your file from .cpp to .c. Otherwise, simply add a cast, all of the code in the tutorial will work without any other changes when compiled as C++.

For example, in C this will work:

HBITMAP hbmOldBuffer = SelectObject(hdcBuffer, hbmBuffer);

But in C++ requires a cast:

HBITMAP hbmOldBuffer = (HBITMAP)SelectObject(hdcBuffer, hbmBuffer);

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